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CN107994773A - A kind of control method and system of photovoltaic DC-to-AC converter Boost circuit - Google Patents

A kind of control method and system of photovoltaic DC-to-AC converter Boost circuit Download PDF

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Publication number
CN107994773A
CN107994773A CN201711247472.7A CN201711247472A CN107994773A CN 107994773 A CN107994773 A CN 107994773A CN 201711247472 A CN201711247472 A CN 201711247472A CN 107994773 A CN107994773 A CN 107994773A
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mrow
msub
signal
busfb
boost
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CN201711247472.7A
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CN107994773B (en
Inventor
李小龙
廖小俊
舒成维
吴招米
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Elsevier Technology Co ltd
Esway Technology Shanghai Co ltd
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Aisima New Energy Technology (shanghai) Co Suzhou High Tech Development Zone Branch
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/157—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Photovoltaic Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

A kind of the disclosure of the invention improved control method and system of photovoltaic DC-to-AC converter Boost circuit of the invention.A kind of control method of photovoltaic DC-to-AC converter Boost circuit, includes the following steps：S1, obtain photovoltaic array voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbWith inductor current feedback signal iLfb；S2, photovoltaic array Voltage Reference vpvrefSubtract the voltage feedback signal vpvfbVoltage error signal is obtained, the voltage error signal is through Voltage loop adjuster GvcObtain inductive current reference signal iLref, by the inductive current reference signal iLrefWith the inductor current feedback signal iLfbSubstitute into electric current loop adjuster GicAdjusted signal vc1；S3, by the voltage feedback signal vpvfb, the DC bus-bar voltage feedback signal vbusfbWith the modulated signal v of a upper switch periodsmSubstitute into feedforward regulator GffThe middle adjusted signal v of processingc2；S4, by the Regulate signal vc1And vc2Addition obtains new modulated signal vm, and PWM makers are sent into, produce the PWM drive signal of Boost switching tubes.

Description

A kind of control method and system of photovoltaic DC-to-AC converter Boost circuit
Technical field
The present invention relates to photovoltaic DC-to-AC converter Boost circuit control field, more particularly to a kind of photovoltaic DC-to-AC converter Boost circuit Control method and system.
Background technology
It is the distributed generation system of representative as one of major way of renewable energy utilization using wind energy and solar energy, Can dominate existing power grid economical operation and, increasingly increase using proportion in electric system.Boost is converted Device is used as a kind of simple in structure, wider booster type circuit converter of use occasion, is widely used in the light of various power grades Lie prostrate in inverter, adjust photovoltaic array output voltage, and realize maximum power point tracking (MPPT).Steady dc voltage controls Inverter safety and stability high-efficiency and economic is run with good MPP trackings most important.Therefore, how Boost is realized The stability contorting of DC voltage, it is to improve Boost to improve to the antijamming capability of photovoltaic array voltage and load conversion The key of control performance.
Fig. 1 shows a kind of structure chart of conventional photovoltaic inverter of the prior art, which includes Photovoltaic array, Boost, dc-link capacitance Cbus, gird-connected inverter, public electric wire net and digitial controller and its periphery Circuit etc..Wherein, Boost is by input capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodebComposition；Hvp, HvbAnd HiRespectively photovoltaic array voltage vpv, DC bus-bar voltage vbusWith inductive current iLThe equivalent biography of hardware sampling processing circuit Delivery function, generally low-pass first order filter, according to Hvp, HvbAnd HiPhotovoltaic array voltage feedback signal can be respectively obtained vpvfb, DC bus-bar voltage feedback signal vbusfbWith inductor current feedback signal iLfb, the physical significance of these signals is signal vpv、vbusAnd iLSwitch periods average value；GvcAnd GicRespectively Voltage loop adjuster and electric current loop adjuster.
Its specific control process is illustrated in conjunction with Fig. 2.Fig. 2 shows the biography that adoption status space average method obtains Control block diagram of the Boost of uniting under CCM (inductor current continuous mode) pattern, wherein, GdTo use digital control institute Sampling delay and the PWM modulation delay of introducing, generally 1.5 sampling period Ts；ZLAnd ZCRespectively filter inductance, filtered electrical The impedance of appearance.As can be known from Fig. 2, photovoltaic array Voltage Reference vpvrefSubtract voltage feedback signal vpvfbObtain voltage error letter Number, which passes through adjuster Gvc, obtain inductive current reference signal iLref；Inductive current refers to iLrefIt is anti-to subtract electric current Feedback signal iLfbCurrent error signal is obtained, which passes through adjuster Gic, and divided by DC bus-bar voltage feedback signal vbusfb, obtain modulated signal vm, which obtains Boost switching tube drive signals, passes through tune after PWM generator Section switching tube turns on and off the time so that inductive current iLTracking inductive current refers to iLref, so that photovoltaic array exports Voltage vpvCan be with floating voltage reference signal vpvref。
From figure 2 it can be seen that the control method of voltage and current double closed-loop despite the use of, due to signal vpvOccur at the same time In inner and outer ring, causing current inner loop and outer voltage, there are close coupling relation, not only increase design of Regulator difficulty, and easily Generating system resonance, can not effectively improve system bandwidth.
In addition, the modeling of converter does not consider Converter in DCM (discontinuous mode) mould in the control block diagram of Fig. 2 Actual motion state under formula, causes the mismatch of model and actual motion state, and then causes control parameter to mismatch, and reduces control Precision processed, or even cause system unstable.
The content of the invention
For above-mentioned technical problem, the present invention provide a kind of photovoltaic DC-to-AC converter Boost circuit improved control method and System.
On the one hand, the technical solution adopted by the present invention is：
A kind of control method of photovoltaic DC-to-AC converter Boost circuit, includes the following steps：
S1, obtain photovoltaic array voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbIt is anti-with inductive current Feedback signal iLfb；
S2, photovoltaic array Voltage Reference vpvrefSubtract the voltage feedback signal vpvfbVoltage error signal is obtained, it is described Voltage error signal is through Voltage loop adjuster GvcObtain inductive current reference signal iLref, by the inductive current reference signal iLrefWith the inductor current feedback signal iLfbSubstitute into electric current loop adjuster GicAdjusted signal vc1；
S3, by the voltage feedback signal vpvfb, the DC bus-bar voltage feedback signal vbusfbWith a upper switch periods Modulated signal vmSubstitute into feedforward regulator GffThe middle adjusted signal v of processingc2；
S4, by the Regulate signal vc1And vc2Addition obtains new modulated signal vm, and PWM makers are sent into, produce The PWM drive signal of Boost switching tubes.
In certain embodiments, the step S3 includes：
Compare the voltage feedback signal vpvfbWith the DC bus-bar voltage feedback signal vbusfbBetween size,
If vpvfb≥vbusfb, then make feedforward regulator output signal be
vc2=0
If vpvfb＜ vbusfb, then following steps are carried out：
By the modulated signal v of a upper switch periodsmSubstitution and and the DC bus-bar voltage feedback signal vbusfbIt is multiplied, obtains To vm×vbusfbAmount, and by the amount and the DC bus-bar voltage feedback signal and the difference of the photovoltaic array voltage feedback signal Value vbusfb-vpvfbMake comparisons,
If vbusfb-vpvfb≤vm×vbusfb, then make feedforward regulator output signal be
vc2=vbusfb-vpvfb
If vbusfb-vpvfb＞ vm×vbusfb, then make feedforward regulator output signal be
vc2=vm×vbusfb。
In certain embodiments, the step S3 further comprise solving respectively Boost in ccm mode and/ Or the Regulate signal v under DCM patternsc2。
In certain embodiments, the step S3 further comprises：
Compare the voltage feedback signal vpvfbWith the DC bus-bar voltage feedback signal vbusfbBetween size,
If vpvfb≥vbusfb, then make feedforward regulator output signal be
vc2=0
If vpvfb＜ vbusfb, then following steps are carried out：
By the modulated signal v of a upper switch periodsmSubstitution and and the DC bus-bar voltage feedback signal vbusfbIt is multiplied, obtains To vm×vbusfbAmount, and by the amount and the DC bus-bar voltage feedback signal and the difference of the photovoltaic array voltage feedback signal Value vbusfb-vpvfbMake comparisons,
If vbusfb-vpvfb≤vm×vbusfb, then carry out solving the Regulate signal v of Boost in ccm modec2's Step；
And/or
If vbusfb-vpvfb＞ vm×vbusfb, then carry out solving the Regulate signal v of Boost in dcm modec2's Step.
In certain embodiments, Regulate signal v of the Boost under CCM states is solvedc2The step of specifically include：
S311, Boost modeling：
Make LpvRepresent the filter inductance of Boost, iLThe filter inductance electric current of Boost is represented, when t is represented Between, vpvRepresent photovoltaic array voltage, vbusRepresent DC bus-bar voltage, d represents modulated signal vmModulated after PWM generator The duty cycle signals gone out, CpvRepresent the input capacitance of Boost, Δ TsRepresent inductive current iLIt is required to drop to 0 Time, while be also diode DbON time, Δ represents diode DbConducting dutycycle signal, then Boost exist State equation such as formula (1-1) under CCM patterns,
It is z to make photovoltaic array equivalent output impedancepv, then the input current i of BoostpvIt is equivalent with formula (1-2),
Formula (1-2) is substituted into formula (1-1), and asks for Laplace transform, obtains mathematics of the Boost under CCM Model is as follows,
In formula (1-3), s represents Laplace operator；
S312, feedforward regulator design：
Design adjuster meets formula (1-4), realizes the inner and outer ring decoupling of Boost in ccm mode,
Thus, Boost in ccm mode when, feedforward regulator GffAs shown in formula (1-5),
Gff=vbus-vpv(1-5)；
S313, feedforward regulator are realized：
Boost includes input capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodeb；Hvp、HvbAnd Hi Respectively photovoltaic array voltage vpv, DC bus-bar voltage vbusWith inductive current iLHardware sampling processing circuit equivalent transfer function, According to Hvp、HvbAnd HiRespectively obtain photovoltaic array voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbAnd inductance Current feedback signal iLfb, vpvfb、vbusfbAnd iLfbIt is expressed as signal vpv、vbusAnd iLSwitch periods average value；vmFor Boost switching tube modulated signals, its duty cycle are d, ignore high frequency switching noise, then d=vm；
If vbusfb-vpvfb≤vm×vbusfb, then make feedforward regulator output signal be
vc2=vbusfb-vpvfb。
In certain embodiments, Regulate signal v of the Boost under DCM states is solvedc2The step of specifically include：
S321, Boost modeling：
Make LpvRepresent the filter inductance of Boost, iLThe filter inductance electric current of Boost is represented, when t is represented Between, vpvRepresent photovoltaic array voltage, vbusRepresent DC bus-bar voltage, d represents modulated signal vmModulated after PWM generator The duty cycle signals gone out, CpvRepresent the input capacitance of Boost, Δ TsRepresent inductive current iLIt is required to drop to 0 Time, while be also diode DbON time, Δ represents diode DbConducting dutycycle signal, then Boost convert The state equation of device in dcm mode such as formula (2-1),
It is z to make photovoltaic array equivalent output impedancepv, then the input current i of BoostpvIt is equivalent with formula (2-2),
Formula (2-2) is substituted into formula (2-1), and asks for Laplace transform, obtains mathematics of the Boost under DCM Model is as follows,
In formula (2-3), s represents Laplace operator；
S322, feedforward regulator design：
Design adjuster meets formula (2-4), realizes the inner and outer ring decoupling of Boost in dcm mode,
Thus, Boost in dcm mode when, feedforward regulator GffAs shown in formula (2-5),
Gff=(d+ Δs) (vbus-vpv) (2-5)
Formula (2-6) dissolves to obtain formula (2-7),
When Boost is under DCM, d+ Δs ＜ 1, then Boost should meet,
vbus-vpv＞ dvbus (2-8)
Formula (2-7) is substituted into formula (2-4) at this time, obtaining feedforward regulator in dcm mode is：
Gff=dvbus(2-9)；
S323, feedforward regulator are realized：
Boost includes input capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodeb；Hvp、HvbAnd Hi Respectively photovoltaic array voltage vpv, DC bus-bar voltage vbusWith inductive current iLHardware sampling processing circuit equivalent transfer function, According to Hvp、HvbAnd HiRespectively obtain photovoltaic array voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbAnd inductance Current feedback signal iLfb, vpvfb、vbusfbAnd iLfbIt is expressed as signal vpv、vbusAnd iLSwitch periods average value；vmFor Boost switching tube modulated signals, its duty cycle are d, ignore high frequency switching noise, then d=vm；
If vbusfb-vpvfb＞ vm×vbusfb, then make feedforward regulator output signal be
vc2=vm×vbusfb。
On the other hand, the technical solution adopted by the present invention is as follows：
A kind of control system of photovoltaic DC-to-AC converter Boost circuit control method described in application, including photovoltaic array, Boost, dc-link capacitance Cbus, gird-connected inverter, public electric wire net, digitial controller and digitial controller periphery electricity Road, the Boost include input capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodeb, the numeral control Device processed includes：
Voltage loop adjuster Gvc, for by photovoltaic array Voltage Reference vpvrefSubtract the voltage feedback signal vpvfbObtain Voltage error signal processing be inductive current reference signal iLref；
Electric current loop adjuster Gic, for by the inductive current reference signal iLrefWith inductor current feedback signal iLfbPlace Manage adjusted signal vc1；
Feedforward regulator Gff, for by the voltage feedback signal vpvfb, the DC bus-bar voltage feedback signal vbusfb With the modulated signal v of a upper switch periodsmHandle adjusted signal vc2；And
Arithmetic unit, for by the Regulate signal vc1And vc2Addition obtains new modulated signal vm；
The digitial controller peripheral circuit includes：
PWM makers, for the new modulated signal v according to receptionmProduce to the switching tube SbPWM driving Signal.
In certain embodiments, the digitial controller peripheral circuit further includes：
Sampling processing circuit Hvp, for by photovoltaic array voltage vpvEquivalent process is photovoltaic array voltage feedback signal vpvfb；
Sampling processing circuit Hvb, for by DC bus-bar voltage vbusEquivalent process is DC bus-bar voltage feedback signal vbusfb；And
Sampling processing circuit Hi, for by inductive current iLEquivalent process is inductor current feedback signal iLfb。
In certain embodiments, the sampling processing circuit Hvp, the sampling processing circuit HvbWith sampling processing electricity Road HiRespectively low-pass first order filter or multiple order low pass filter.
The present invention uses above scheme, has the following advantages that compared with prior art：
(1), influence of the two kinds of operating statuses of DCM patterns and CCM patterns of Boost to adjuster need not be considered, Simplify design of Regulator；
(2), can effectively to system resonance carry out active damping, extension system control bandwidth, improve voltage, electric current with Track performance and interference free performance.
Brief description of the drawings
, below will be to attached drawing needed in embodiment description in order to illustrate more clearly of technical scheme It is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, general for this area For logical technical staff, without creative efforts, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is a kind of photovoltaic DC-to-AC converter Boost control structure schematic diagram of the prior art.
Fig. 2 is a kind of photovoltaic DC-to-AC converter Boost control block diagram of the prior art.
Fig. 3 a, 3b are respectively that Boost works in waveform correlation under CCM and DCM patterns.
Fig. 4 is the control system schematic diagram according to a kind of photovoltaic DC-to-AC converter Boost of the present invention.
Fig. 5 a, 5b are respectively Boost steady-state operation under DCM, CCM pattern of control method using the present invention When experimental waveform.
Fig. 6 a, 6b be respectively the photovoltaic array output power bust of control method using the present invention, Boost changes when uprushing Parallel operation runs waveform.
Embodiment
Presently preferred embodiments of the present invention is described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy It is easier to be understood by the person skilled in the art.It should be noted that it is used to help for the explanation of these embodiments Understand the present invention, but do not form limitation of the invention.It is in addition, involved in each embodiment of invention described below As long as and to technical characteristic do not form conflict each other and be combined with each other.
On the one hand, the present invention provides a kind of control method of photovoltaic DC-to-AC converter Boost circuit.The control method includes as follows Step：
S1, obtain photovoltaic array voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbIt is anti-with inductive current Feedback signal iLfb；
S2, photovoltaic array Voltage Reference vpvrefSubtract the voltage feedback signal vpvfbVoltage error signal is obtained, it is described Voltage error signal is through Voltage loop adjuster GvcObtain inductive current reference signal iLref, by the inductive current reference signal iLrefWith the inductor current feedback signal iLfbSubstitute into electric current loop adjuster GicAdjusted signal vc1；
S3, by the voltage feedback signal vpvfb, the DC bus-bar voltage feedback signal vbusfbWith a upper switch periods Modulated signal vmSubstitute into feedforward regulator GffThe middle adjusted signal v of processingc2；
S4, by the Regulate signal vc1And vc2Addition obtains new modulated signal vm, and PWM makers are sent into, produce The PWM drive signal of Boost switching tubes.
On the other hand, the present invention also provides a kind of control of the photovoltaic DC-to-AC converter Boost circuit control method described in application System.With reference to shown in Fig. 4, which includes photovoltaic array 1, Boost 2, dc bus 3, dc-link capacitance Cbus, gird-connected inverter 4, public electric wire net 5, digitial controller 6 and digitial controller peripheral circuit.The Boost is by defeated Enter capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodebComposition.The digitial controller 6 includes：
Voltage loop adjuster Gvc, for by photovoltaic array Voltage Reference vpvrefSubtract the voltage feedback signal vpvfbObtain Voltage error signal processing be inductive current reference signal iLref；
Electric current loop adjuster Gic, for by the inductive current reference signal iLrefWith inductor current feedback signal iLfbPlace Manage adjusted signal vc1；
Feedforward regulator Gff, for will be by the voltage feedback signal vpvfb, the DC bus-bar voltage feedback signal vbusfbWith the modulated signal v of a upper switch periodsmHandle adjusted signal vc2；And
Arithmetic unit, for by the Regulate signal vc1And vc2Addition obtains new modulated signal vm；
The digitial controller peripheral circuit includes：
PWM makers (PWM), for the new modulated signal v according to receptionmProduce to the switching tube SbPWM Drive signal.
The digitial controller peripheral circuit further includes：
Sampling processing circuit Hvp, for by photovoltaic array voltage vpvEquivalent process is photovoltaic array voltage feedback signal vpvfb；
Sampling processing circuit Hvb, for by DC bus-bar voltage vbusEquivalent process is DC bus-bar voltage feedback signal vbusfb；And
Sampling processing circuit Hi, for by inductive current iLEquivalent process is inductor current feedback signal iLfb。
The step 3 of above-mentioned control method is described in detail with reference to Fig. 3 a and Fig. 3 b.
1st, Boost models：
Fig. 3 a, Fig. 3 b are respectively exemplary operation waveform of the Boost under CCM and DCM states, wherein TsFor conversion Device switch periods；D is modulated signal vmThe duty cycle signals modulated after PWM generator；Δ T in Fig. 3 bsFor inductive current iLDropped to for 0 required time, while be also diode DbON time.It can be obtained using State-space Averaging Principle, in CCM Stateful equation such as formula (1) under pattern,
Stateful equation such as formula (2) in dcm mode,
In Boost shown in Fig. 1 or 4, it is z to make photovoltaic array equivalent output impedancepv, then Boost is defeated Enter electric current ipvFormula (3) Approximate Equivalent can be used
(3) formula is substituted into (1) formula and (2) formula, and asks for Laplace transform, then can obtain Boost in CCM and Mathematical model under DCM patterns is as follows
It is in ccm mode
It is in dcm mode
2nd, feedforward regulator designs：
Mathematical model of the Boost under CCM and DCM patterns is analyzed, if design adjuster meets in ccm mode Formula (6), formula (7), then can realize that Boost inner and outer ring decouples in dcm mode.
So feedforward regulator G can be designedffIt is under Boost CCM patterns：
Gff=vbus-vpv (8)
It is in dcm mode
Gff=(d+ Δs) (vbus-vpv) (9)
3rd, feedforward regulator simplifies：
By in Fig. 3 b,
Dissolve,
Since Boost is in DCM patterns, d+ Δs ＜ 1, then Boost should meet at this time：
vbus-vpv＜ dvbus (12)
Formula (11) is substituted into formula (7) at this time, obtaining feedforward regulator in dcm mode is：
Gff=dvbus (13)
4th, feedforward regulator is realized：
Fig. 4 show the control system schematic diagram of the photovoltaic DC-to-AC converter Boost circuit using control method of the present invention, mainly By photovoltaic array 1, Boost 2, dc-link capacitance Cbus, gird-connected inverter 4, public electric wire net 5 and digitial controller 6 and Its peripheral circuit etc. forms.Wherein, Boost 2 is mainly by input capacitance Cpv, filter inductance Lpv, switching tube SbAnd afterflow Diode DbComposition；Hvp, HvbAnd HiRespectively photovoltaic array voltage vpv, DC bus-bar voltage vbusWith inductive current iLHardware is adopted Sample process circuit, generally low-pass first order filter, according to equivalent transfer function Hvp、HvbAnd HiPhotovoltaic array can be respectively obtained Voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbWith inductor current feedback signal iLfb, the physics of these signals Meaning is signal vpv、vbusAnd iLSwitch periods average value；GvcAnd GicRespectively Voltage loop adjuster and electric current loop adjuster, Generally use proportional plus integral control strategy；vmFor Boost switching tube modulated signals, required switch is can obtain by PWM generator Drive signal, its duty cycle are d, ignore high frequency switching noise, then have d=vm。
According to formula (8) and formula (12), step S3 specifically comprises the following steps：
(1), feedback signal v is comparedpvfbAnd vbusfbBetween size, if vpvfb≥vbusfb, then feedforward regulator output letter is made Number it is
vc2=0；
(2) if, feedback signal vpvfbAnd vbusfbMeet vpvfb＜ vbusfb, then following steps are carried out：
1. by modulated signal vmSubstitution and and DC bus-bar voltage vbusfbIt is multiplied, obtains vm×vbusfbAmount, and by the amount with DC bus-bar voltage and photovoltaic array voltage difference vbusfb-vpvfbMake comparisons, if meeting vbusfb-vpvfb≤vm×vbusfb, then make Feedforward regulator exports signal
vc2=vbusfb-vpvfb；
If 2. meet vbusfb-vpvfb＞ vm×vbusfb, then make feedforward regulator output signal be
vc2=vm×vbusfb。
Embodiment
An instantiation is given below to illustrate influence of the feedforward regulator to system performance, its major parameter is as follows：
Photovoltaic array MPP point voltages Vpv=200V；
Network voltage Vg=230V；
Specified input current Ipv=15A；
Switching frequency fs=20kHz；
Filter inductance Lpv=0.78mH；
Input capacitance Cpv=14 μ F；
Photovoltaic array and DC bus-bar voltage signal sampling modulate circuit transmission function
Inductor current signal over-sampling modulate circuit transmission function
Actual photovoltaic array is simulated using programmable optical photovoltaic array simulation source, sets MPP point voltages as 200V；Adopt at the same time Public electric wire net voltage is simulated with Programmable AC Power Source, sets network voltage as Vg=230V, sine degree are good.
The equal working stability of inverter, effectively demonstrates the practicality of control method of the present invention.
Fig. 5 a, 5b are respectively experimental waveform of the Boost under DCM, CCM pattern during steady-state operation, steady operation Stablize, non-generating system resonance.CH1 is photovoltaic array voltage v in figurepvWaveform；CH3 is DC bus-bar voltage vbusWaveform；CH4 For inductive current iLWaveform.
Fig. 6 a, 6b be respectively photovoltaic array output power bust, Boost operation waveform when uprushing, and CH1 is in figure Photovoltaic array voltage vpvWaveform；CH3 is DC bus-bar voltage vbusWaveform；CH4 is inductive current iLWaveform.Can from figure Go out, when photovoltaic array output power is mutated, Boost can quick tracking array output current ipvChange, photovoltaic Array voltage vpvFluctuate small, dynamic response is rapid, and is vibrated for generating system, and inverter working stability, effectively demonstrates this hair The practicality of bright control method.
The above embodiments merely illustrate the technical concept and features of the present invention, is a kind of preferred embodiment, its purpose exists It can understand present disclosure in person skilled in the art and implement according to this, the protection of the present invention can not be limited with this Scope.The all equivalent transformation made of Spirit Essence or modification according to the present invention, should all cover protection scope of the present invention it It is interior.

Claims (9)

1. a kind of control method of photovoltaic DC-to-AC converter Boost circuit, it is characterised in that include the following steps：
S1, obtain photovoltaic array voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbBelieve with inductor current feedback Number iLfb；
S2, photovoltaic array Voltage Reference vpvrefSubtract the voltage feedback signal vpvfbObtain voltage error signal, the voltage Error signal is through Voltage loop adjuster GvcObtain inductive current reference signal iLref, by the inductive current reference signal iLrefWith The inductor current feedback signal iLfbSubstitute into electric current loop adjuster GicAdjusted signal vc1；
S3, by the voltage feedback signal vpvfb, the DC bus-bar voltage feedback signal vbusfbWith the tune of a upper switch periods Signal v processedmSubstitute into feedforward regulator GffThe middle adjusted signal v of processingc2；
S4, by the Regulate signal vc1And vc2Addition obtains new modulated signal vm, and PWM makers are sent into, produce Boost and open Close the PWM drive signal of pipe.
2. control method according to claim 1, it is characterised in that the step S3 includes：
Compare the voltage feedback signal vpvfbWith the DC bus-bar voltage feedback signal vbusfbBetween size,
If vpvfb≥vbusfb, then make feedforward regulator output signal be
vc2=0
If vpvfb＜ vbusfb, then following steps are carried out：
By the modulated signal v of a upper switch periodsmSubstitution and and the DC bus-bar voltage feedback signal vbusfbIt is multiplied, obtains vm ×vbusfbAmount, and by the amount and the DC bus-bar voltage feedback signal and the difference of the photovoltaic array voltage feedback signal vbusfb-vpvfbMake comparisons,
If vbusfb-vpvfb≤vm×vbusfb, then make feedforward regulator output signal be
vc2=vbusfb-vpvfb
If vbusfb-vpvfb＞ vm×vbusfb, then make feedforward regulator output signal be
vc2=vm×vbusfb。
3. control method according to claim 1, it is characterised in that the step S3 further comprises solving respectively Regulate signal v of the Boost in ccm mode and/or under DCM patternsc2。
4. control method according to claim 3, it is characterised in that the step S3 further comprises：
Compare the voltage feedback signal vpvfbWith the DC bus-bar voltage feedback signal vbusfbBetween size,
If vpvfb≥vbusfb, then make feedforward regulator output signal be
vc2=0
If vpvfb＜ vbusfb, then following steps are carried out：
By the modulated signal v of a upper switch periodsmSubstitution and and the DC bus-bar voltage feedback signal vbusfbIt is multiplied, obtains vm ×vbusfbAmount, and by the amount and the DC bus-bar voltage feedback signal and the difference of the photovoltaic array voltage feedback signal vbusfb-vpvfbMake comparisons,
If vbusfb-vpvfb≤vm×vbusfb, then carry out solving the Regulate signal v of Boost in ccm modec2The step of；
And/or
If vbusfb-vpvfb＞ vm×vbusfb, then carry out solving the Regulate signal v of Boost in dcm modec2The step of.
5. control method according to claim 4, it is characterised in that solve adjusting of the Boost under CCM states Signal vc2The step of specifically include：
S311, Boost modeling：
Make LpvRepresent the filter inductance of Boost, iLRepresenting the filter inductance electric current of Boost, t represents the time, vpvRepresent photovoltaic array voltage, vbusRepresent DC bus-bar voltage, d represents modulated signal vmModulated after PWM generator Duty cycle signals, CpvRepresent the input capacitance of Boost, Δ TsRepresent inductive current iLDropped to for 0 required time, It is also diode D at the same timebON time, Δ represents diode DbConducting dutycycle signal, then Boost is in CCM moulds State equation such as formula (1-1) under formula,
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>L</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mfrac> <mrow> <msub> <mi>di</mi> <mi>L</mi> </msub> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> <mo>=</mo> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>v</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>dv</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>C</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mfrac> <mrow> <msub> <mi>dv</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> <mo>=</mo> <msub> <mi>i</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>i</mi> <mi>L</mi> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
It is z to make photovoltaic array equivalent output impedancepv, then the input current i of BoostpvIt is equivalent with formula (1-2),
<mrow> <msub> <mi>i</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>=</mo> <mo>-</mo> <mfrac> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <msub> <mi>z</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
Formula (1-2) is substituted into formula (1-1), and asks for Laplace transform, obtains mathematical model of the Boost under CCM It is as follows,
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>i</mi> <mi>L</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>v</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> </mrow> <mrow> <msub> <mi>sL</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> </mrow> </mfrac> <mo>-</mo> <mfrac> <msub> <mi>v</mi> <mrow> <mi>u</mi> <mi>s</mi> </mrow> </msub> <mrow> <msub> <mi>sL</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> </mrow> </mfrac> <mi>d</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>=</mo> <mo>-</mo> <mfrac> <msub> <mi>z</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mrow> <msub> <mi>sC</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <msub> <mi>z</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>+</mo> <mn>1</mn> </mrow> </mfrac> <msub> <mi>i</mi> <mi>L</mi> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>
In formula (1-3), s represents Laplace operator；
S312, feedforward regulator design：
Design adjuster meets formula (1-4), realizes the inner and outer ring decoupling of Boost in ccm mode,
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <mi>d</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>G</mi> <mrow> <mi>i</mi> <mi>c</mi> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mi>i</mi> <mrow> <mi>L</mi> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>i</mi> <mi>L</mi> </msub> <mo>)</mo> </mrow> <mo>+</mo> <msub> <mi>v</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> </mrow> <msub> <mi>v</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> </mfrac> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>i</mi> <mrow> <mi>L</mi> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mo>=</mo> <mo>-</mo> <msub> <mi>G</mi> <mrow> <mi>v</mi> <mi>c</mi> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
Thus, Boost in ccm mode when, feedforward regulator GffAs shown in formula (1-5),
Gff=vbus-vpv(1-5)；
S313, feedforward regulator are realized：
Boost includes input capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodeb；Hvp、HvbAnd HiRespectively For photovoltaic array voltage vpv, DC bus-bar voltage vbusWith inductive current iLHardware sampling processing circuit equivalent transfer function, according to Hvp、HvbAnd HiRespectively obtain photovoltaic array voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbAnd inductive current Feedback signal iLfb, vpvfb、vbusfbAnd iLfbIt is expressed as signal vpv、vbusAnd iLSwitch periods average value；vmFor Boost Switching tube modulated signal, its duty cycle are d, ignore high frequency switching noise, then d=vm；
If vbusfb-vpvfb≤vm×vbusfb, then make feedforward regulator output signal be
vc2=vbusfb-vpvfb。
6. control method according to claim 4, it is characterised in that solve adjusting of the Boost under DCM states Signal vc2The step of specifically include：
S321, Boost modeling：
Make LpvRepresent the filter inductance of Boost, iLRepresenting the filter inductance electric current of Boost, t represents the time, vpvRepresent photovoltaic array voltage, vbusRepresent DC bus-bar voltage, d represents modulated signal vmModulated after PWM generator Duty cycle signals, CpvRepresent the input capacitance of Boost, Δ TsRepresent inductive current iLDropped to for 0 required time, It is also diode D at the same timebON time, Δ represents diode DbConducting dutycycle signal, then Boost is in DCM moulds State equation such as formula (2-1) under formula,
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>L</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mfrac> <mrow> <msub> <mi>di</mi> <mi>L</mi> </msub> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> <mo>=</mo> <mrow> <mo>(</mo> <mi>d</mi> <mo>+</mo> <mi>&amp;Delta;</mi> <mo>)</mo> </mrow> <mrow> <mo>(</mo> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>v</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mi>dv</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>C</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mfrac> <mrow> <msub> <mi>dv</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> <mo>=</mo> <msub> <mi>i</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>i</mi> <mi>L</mi> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>-</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
It is z to make photovoltaic array equivalent output impedancepv, then the input current i of BoostpvIt is equivalent with formula (2-2),
<mrow> <msub> <mi>i</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>=</mo> <mo>-</mo> <mfrac> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <msub> <mi>z</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>-</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
Formula (2-2) is substituted into formula (2-1), and asks for Laplace transform, obtains mathematical model of the Boost under DCM It is as follows,
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>i</mi> <mi>L</mi> </msub> <mo>=</mo> <mrow> <mo>(</mo> <mi>d</mi> <mo>+</mo> <mi>&amp;Delta;</mi> <mo>)</mo> </mrow> <mfrac> <mrow> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>v</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> </mrow> <mrow> <msub> <mi>sL</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> </mrow> </mfrac> <mo>-</mo> <mfrac> <msub> <mi>v</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> <mrow> <msub> <mi>sL</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> </mrow> </mfrac> <mi>d</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>=</mo> <mo>-</mo> <mfrac> <msub> <mi>z</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mrow> <msub> <mi>sC</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <msub> <mi>z</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>+</mo> <mn>1</mn> </mrow> </mfrac> <msub> <mi>i</mi> <mi>L</mi> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>-</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>
In formula (2-3), s represents Laplace operator；
S322, feedforward regulator design：
Design adjuster meets formula (2-4), realizes the inner and outer ring decoupling of Boost in dcm mode,
<mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <mi>d</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>G</mi> <mrow> <mi>i</mi> <mi>c</mi> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mi>i</mi> <mrow> <mi>L</mi> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>i</mi> <mi>L</mi> </msub> <mo>)</mo> </mrow> <mo>+</mo> <mrow> <mo>(</mo> <mi>d</mi> <mo>+</mo> <mi>&amp;Delta;</mi> <mo>)</mo> </mrow> <mrow> <mo>(</mo> <msub> <mi>v</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow> <msub> <mi>v</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> </mfrac> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>i</mi> <mrow> <mi>L</mi> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mo>=</mo> <mo>-</mo> <msub> <mi>G</mi> <mrow> <mi>v</mi> <mi>c</mi> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> <mi>r</mi> <mi>e</mi> <mi>f</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>-</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
Thus, Boost in dcm mode when, feedforward regulator GffAs shown in formula (2-5),
Gff=(d+ Δs) (vbus-vpv) (2-5)
Formula (2-6) dissolves to obtain formula (2-7),
<mrow> <msub> <mi>i</mi> <mrow> <mi>L</mi> <mi>p</mi> <mi>k</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>dT</mi> <mi>s</mi> </msub> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> </mrow> <mi>L</mi> </mfrac> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&amp;Delta;T</mi> <mi>s</mi> </msub> <mrow> <mo>(</mo> <msub> <mi>v</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow> <mi>L</mi> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>-</mo> <mn>6</mn> <mo>)</mo> </mrow> </mrow>
<mrow> <mi>d</mi> <mo>+</mo> <mi>&amp;Delta;</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>dv</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> </mrow> <mrow> <msub> <mi>v</mi> <mrow> <mi>b</mi> <mi>u</mi> <mi>s</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>v</mi> <mrow> <mi>p</mi> <mi>v</mi> </mrow> </msub> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>-</mo> <mn>7</mn> <mo>)</mo> </mrow> </mrow>
When Boost is under DCM, d+ Δs ＜ 1, then Boost should meet,
vbus-vpv＞ dvbus (2-8)
Formula (2-7) is substituted into formula (2-4) at this time, obtaining feedforward regulator in dcm mode is：
Gff=dvbus(2-9)；
S323, feedforward regulator are realized：
Boost includes input capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodeb；Hvp、HvbAnd HiRespectively For photovoltaic array voltage vpv, DC bus-bar voltage vbusWith inductive current iLHardware sampling processing circuit equivalent transfer function, according to Hvp、HvbAnd HiRespectively obtain photovoltaic array voltage feedback signal vpvfb, DC bus-bar voltage feedback signal vbusfbAnd inductive current Feedback signal iLfb, vpvfb、vbusfbAnd iLfbIt is expressed as signal vpv、vbusAnd iLSwitch periods average value；vmFor Boost Switching tube modulated signal, its duty cycle are d, ignore high frequency switching noise, then d=vm；
If vbusfb-vpvfb＞ vm×vbusfb, then make feedforward regulator output signal be
vc2=vm×vbusfb。
7. a kind of control system for applying the photovoltaic DC-to-AC converter Boost circuit control method as described in claim 1-6 is any, bag Include photovoltaic array, Boost, dc-link capacitance Cbus, gird-connected inverter, public electric wire net, digitial controller and numeral control Device peripheral circuit processed, the Boost include input capacitance Cpv, filter inductance Lpv, switching tube SbAnd sustained diodeb, It is characterized in that, the digitial controller includes：
Voltage loop adjuster Gvc, for by photovoltaic array Voltage Reference vpvrefSubtract the voltage feedback signal vpvfbObtained electricity It is inductive current reference signal i to hold up difference signal processingLref；
Electric current loop adjuster Gic, for by the inductive current reference signal iLrefWith inductor current feedback signal iLfbHandle To Regulate signal vc1；
Feedforward regulator Gff, for by the voltage feedback signal vpvfb, the DC bus-bar voltage feedback signal vbusfbWith it is upper The modulated signal v of one switch periodsmHandle adjusted signal vc2；And
Arithmetic unit, for by the Regulate signal vc1And vc2Addition obtains new modulated signal vm；
The digitial controller peripheral circuit includes：
PWM makers, for the new modulated signal v according to receptionmProduce to the switching tube SbPWM drive signal.
8. control system according to claim 7, it is characterised in that the digitial controller peripheral circuit further includes：
Sampling processing circuit Hvp, for by photovoltaic array voltage vpvEquivalent process is photovoltaic array voltage feedback signal vpvfb；
Sampling processing circuit Hvb, for by DC bus-bar voltage vbusEquivalent process is DC bus-bar voltage feedback signal vbusfb；With And
Sampling processing circuit Hi, for by inductive current iLEquivalent process is inductor current feedback signal iLfb。
9. the control system according to claim 8, it is characterised in that the sampling processing circuit Hvp, described adopt Sample process circuit HvbWith the sampling processing circuit HiFor single order or multiple order low pass filter.
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