CN112054661A - Harmonic suppression static quantity output control method for single-phase electric system - Google Patents
Harmonic suppression static quantity output control method for single-phase electric system Download PDFInfo
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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
- H02M1/00—Details of apparatus for conversion
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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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a harmonic suppression static quantity output control method for a single-phase electric system, which adopts DQH control mode, adopts static coordinate system control to fundamental wave component, firstly carries out fundamental wave and harmonic separation to voltage and current signals, extracts fundamental wave by traditional instantaneous value power method, needs extra low-pass filtering under the condition of harmonic input, which causes too slow response, uses a resonator to carry out harmonic extraction, then obtains fundamental wave, only carries out D, Q conversion aiming at fundamental wave component, avoids the influence of harmonic input on static quantity in actual control, carries out independent control to harmonic component for system stability and harmonic suppression, respectively controls current on D, Q axis under static coordinate system, can realize accurate output without static difference, compared with conventional direct control, because of no extra static difference eliminating loop, the dynamic response capability is faster. The method aims to solve the technical problem that the control performance of a single-phase system is poor due to signal amplitude attenuation and distortion generated by transformation in the prior art.
Description
Technical Field
The invention relates to the technical field of automatic control of power electronics, in particular to a harmonic suppression static quantity output control method for a single-phase power system.
Background
Due to the development of modern industry and science and technology, inverter power supplies are used more and more in the aspects of household electricity, vehicle-mounted electricity, movable power supplies and the like, and the electricity power supplies of many users do not use alternating current provided by a large power grid as a power supply, but convert the alternating current through various power transformation, so that a more stable and reliable electric energy form is obtained. Generally, dc power is converted into ac power to be supplied to a load, and various inverters such as a correction wave inverter, a sine wave inverter, and a square wave inverter have appeared. Therefore, high performance inverters are hot spots in the power electronics field. The sine pulse width modulation inverter is used as one of inverters, can output sine waveforms with small harmonic content, improves the steady-state precision and reliability of the output waveforms, reduces the damage to electric equipment and the like, and is the most extensive in practical application.
Nowadays, inverters are widely applied, various control technologies are increasingly lean, for example, the inverters are applied quite frequently in aspects of battery energy storage, photovoltaic power generation, variable frequency electric appliances, power supply in remote weak-current and non-electric areas, and the like, and it is necessary to research inverter control technologies with more excellent performance.
In order to realize control like direct current in a three-phase alternating current control system, a three-phase rotating coordinate system is converted into a static coordinate system, so that active and reactive separation control is realized on a DQ axis. In a single-phase system, because only one phase is available, DQ conversion cannot be performed directly, the method is generally implemented by using technical methods such as virtual another two phases, phase delay, phase conversion and the like, and the control performance is deteriorated due to signal amplitude attenuation and distortion generated by conversion in the technical methods. Therefore, how to provide a high-precision control method without dead-time control for a single-phase system is a technical problem which needs to be solved urgently.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a harmonic suppression static quantity output control method for a single-phase electric system, and aims to solve the technical problem that the control performance of the single-phase system is poor due to signal amplitude attenuation and distortion generated by conversion in the prior art.
In order to achieve the above object, the present invention provides a harmonic suppression static quantity output control method for a single-phase electrical system, including the steps of:
acquiring harmonic signals and fundamental wave signals of single-phase electricity in a power grid;
carrying out DQ conversion on the obtained fundamental wave signal, carrying out PI regulation on the fundamental wave signal on a D axis and a Q axis, carrying out pure comparison regulation on the harmonic signal, carrying out non-static control on the fundamental wave signal, and carrying out harmonic component control on the harmonic signal;
and carrying out DQ inverse transformation on the PI-adjusted fundamental wave signal, and superposing and outputting the DQ inverse-transformed fundamental wave signal and the harmonic signal.
Preferably, the method for controlling harmonic suppression static quantity output of the single-phase electric system comprises the following sub-steps of:
s101: collecting voltage and current signals in a power grid;
s102: the collected voltage and current signals are processed through a one-way phase-locked loop, so that the phase locking of the power grid is realized, and the angular frequency of the power grid is obtained;
s103: and extracting harmonic signals and fundamental wave signals according to the obtained power grid angular frequency.
Preferably, in the harmonic suppression static quantity output control method for the single-phase electric system, in step S103:
the extracted harmonic signal is obtained by:
wherein: b bandwidth, wpllIn order for the phase-locked loop to output an angular frequency,namely the actual grid angular frequency;
the extracting the fundamental wave signal is performed by:
Base(n)＝Input(n)-Harmonic(n)；
wherein: input (n) is the original input signal, harmonic (n) is the harmonic signal, and base (n) is the fundamental signal.
Preferably, the harmonic suppression static quantity output control method for the single-phase electrical system further includes the step S201: performing phase shift transformation on the acquired fundamental wave signal, wherein the phase shift transformation comprises:
wherein, wpllAnd outputting the angular frequency, namely the actual power grid angular frequency, for the phase-locked loop.
Preferably, the method for controlling harmonic suppression static quantity output for a single-phase electrical system, wherein DQ conversion is performed on the acquired fundamental wave signal:
D＝A*sin(wt)+Beta*cos(wt)
Q＝A*cos(wt)+Beta*sin(wt)；
wherein, A is an input basic signal, Beta is a phase-shifting signal, cos (wt) is a phase-locked loop output cosine, sin (wt) is a phase-locked loop output synchronous sine, D is a D-axis component under a static coordinate system, and Q is a Q-axis component under the static coordinate system.
Preferably, the harmonic suppression static quantity output control method for the single-phase electric system is characterized in that the PI regulation is carried out on a D axis and a Q axis as follows:
wherein, KpFor adjustment of the comparison, KiFor integral adjustment.
Preferably, the harmonic suppression static quantity output control method for the single-phase electric system includes the steps of performing DQ inverse transformation on the PI-regulated fundamental wave signal:
A＝D*cos(wt)-Q*sin(wt)；
wherein D is a D-axis component in a static coordinate system, Q is a Q-axis component in the static coordinate system, cos (wt) is a phase-locked loop output cosine, sin (wt) is a phase-locked loop output synchronous sine, and A is an output signal.
According to the invention, an DQH control mode is adopted, a static coordinate system is adopted for controlling a fundamental component, fundamental wave and harmonic wave separation is firstly carried out on voltage and current signals, the fundamental wave is extracted by a traditional instantaneous value power method, extra low-pass filtering is needed under the condition of harmonic wave input, so that response is too slow, the harmonic wave is extracted by a resonator, then the fundamental wave is obtained, only D, Q conversion is carried out on the fundamental wave component, the influence of harmonic wave input on static quantity in actual control is avoided, the harmonic wave component is independently controlled for system stability and harmonic wave suppression, currents on a D, Q shaft are respectively controlled under the static coordinate system, accurate output without static difference can be realized, and compared with conventional direct control, the dynamic response capability is faster due to the fact that an extra static difference eliminating loop is not provided. The method aims to solve the technical problem that the control performance of a single-phase system is poor due to signal amplitude attenuation and distortion generated by transformation in the prior art.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a diagram illustrating a characteristic curve of a transfer function of a phase variation according to the present embodiment;
FIG. 2 is a schematic diagram of the steps of a conventional single-phase control method with direct voltage and current control;
fig. 3 is a schematic step diagram of a harmonic suppression static quantity output control method for a single-phase electrical system according to this embodiment.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention proposes an embodiment.
As shown in fig. 1, in this embodiment, a harmonic suppression static quantity output control method for a single-phase electrical system specifically includes the following steps: 1. voltage current acquisition data
2. The single-phase-locked loop realizes the phase locking of the power grid and acquires the angular frequency of the power grid
3. Fundamental and harmonic separation
B: bandwidth of
wpllPhase-locked loop output angular frequency, i.e. the actual grid angular frequency equation (1)
The harmonic wave is extracted by using the formula (1) and then the fundamental wave signal is extracted according to the formula (2)
Base(n)＝Input(n)-Harmonic(n)
Input (n): original input signal
Harmonic signals of harmonic
Base (n): fundamental wave signal formula (2)
4. Fundamental wave DQ axis conversion
The phase transformation adopts a formula (3) for transformation, the method needs to obtain the angular frequency of the power grid firstly, the characteristic curve of the transfer function is shown in figure 1, the transfer function has the constant amplitude characteristic but has the nonlinear phase characteristic, so that fundamental wave harmonic wave separation is firstly carried out, only the fundamental wave component is subjected to phase shift transformation, and the influence of non-fundamental frequency input signals on the transformation is avoided.
wpllPhase-locked loop output angular frequency, i.e. the actual grid angular frequency equation (3)
5. Fundamental DQ conversion
D＝A*sin(wt)+Beta*cos(wt)
Q＝A*cos(wt)+Beta*sin(wt)
A: inputting basic signals
Beta: phase-shifted signal
cos (wt.): phase-locked loop output cosine
sin (wt): phase-locked loop output synchronous sine
D: component of D axis in static coordinate system
Q: formula (4) of D axis component in static coordinate system
Equation (4) is a standard DQ conversion.
5. DQH current loop control, DQ implementing no-difference control, H component implementing partial suppression of harmonic
Kp: comparator regulation
Ki: integral regulation formula (5)
The D axis and the Q axis are subjected to PI regulation according to a formula (5), and static-error-free control can be realized.
The harmonic component regulation adopts pure ratio regulation to realize the control of the harmonic component.
6. Fundamental wave DQ inverse transform
A＝D*cos(wt)-Q*sin(wt)
D: component of D axis in static coordinate system
Q: component of D axis in static coordinate system
cos (wt.): phase-locked loop output cosine
sin (wt): phase-locked loop output synchronous sine
A: output signal formula (7)
Since the control system is single-phase control, the A-phase inversion is performed only according to the formula (7)
7. Superpose the harmonic control amount and output
After DQ static-free adjustment and harmonic adjustment, the two components are superposed and output.
In this embodiment, compared to voltage and current direct control:
the current control is as shown in fig. 2, the method has the advantages that the control is simple, the current is given and referenced directly and is subjected to PI regulation by sampling feedback, however, the current is alternating current, I cannot play a role in eliminating the static error, the static error can be eliminated only by adding an additional control loop, namely IaccCom static error compensation current in fig. 1 is needed, and the dynamic characteristic of the system is greatly weakened by adding the static error elimination loop.
In this embodiment, compared to virtually two additional phases:
the method takes an input signal as an A phase, performs phase transformation on the input signal by utilizing a trigonometric function to obtain virtual B and C phases, and then performs DQ transformation by A, B, C to realize control under a static coordinate system.
In this embodiment, DQH control is adopted, as shown in fig. 3, a static coordinate system is adopted for the fundamental component, first, fundamental and harmonic separation is performed on voltage and current signals, the fundamental is extracted by a traditional instantaneous value power method, additional low-pass filtering is needed under the condition of harmonic input, which results in too slow response, harmonic extraction is performed by using a resonator, then the fundamental is obtained, only D, Q transformation is performed on the fundamental component, the influence of harmonic input on the static quantity in actual control is avoided, independent control is performed on the harmonic component for system stability and harmonic suppression, and the current on D, Q axis is respectively controlled under the static coordinate system, so that accurate output without static difference can be realized, and compared with the conventional direct control, the dynamic response capability is faster due to the absence of an additional static difference elimination loop.
The methods, systems, and modules disclosed herein may be implemented in other ways. For example, the above-described embodiments are merely illustrative, and for example, the division of the modules may be merely a logical division, and an actual implementation may have another division, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be referred to as an indirect coupling or communication connection through some interfaces, systems or modules, and may be in an electrical, mechanical or other form.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A harmonic suppression static quantity output control method for a single-phase electric system is characterized by comprising the following steps:
acquiring harmonic signals and fundamental wave signals of single-phase electricity in a power grid;
carrying out DQ conversion on the obtained fundamental wave signal, carrying out PI regulation on the fundamental wave signal on a D axis and a Q axis, carrying out pure comparison regulation on the harmonic signal, carrying out non-static control on the fundamental wave signal, and carrying out harmonic component control on the harmonic signal;
and carrying out DQ inverse transformation on the PI-adjusted fundamental wave signal, and superposing and outputting the DQ inverse-transformed fundamental wave signal and the harmonic signal.
2. The harmonic rejection static quantity output control method for a single phase electrical system as set forth in claim 1, wherein said obtaining the harmonic signal and the fundamental signal of the single phase electricity in the electrical grid comprises the sub-steps of:
s101: collecting voltage and current signals in a power grid;
s102: the collected voltage and current signals are processed through a one-way phase-locked loop, so that the phase locking of the power grid is realized, and the angular frequency of the power grid is obtained;
s103: and extracting harmonic signals and fundamental wave signals according to the obtained power grid angular frequency.
3. The harmonic suppression static quantity output control method for a single-phase electric system according to claim 2, wherein in the step S103:
the extracted harmonic signal is obtained by:
wherein: b bandwidth, wpllOutputting angular frequency for the phase-locked loop, namely the actual power grid angular frequency;
the extracting the fundamental wave signal is performed by:
Base(n)＝Input(n)-Harmonic(n)；
wherein: input (n) is the original input signal, harmonic (n) is the harmonic signal, and base (n) is the fundamental signal.
4. The harmonic suppression static quantity output control method for a single-phase electric system according to claim 1, further comprising the step S201 of: performing phase shift transformation on the acquired fundamental wave signal, wherein the phase shift transformation comprises:
wherein, wpllAnd outputting the angular frequency, namely the actual power grid angular frequency, for the phase-locked loop.
5. The harmonic-suppression static quantity output control method for the single-phase electric system according to claim 1, wherein the DQ conversion of the acquired fundamental wave signal is:
wherein, A is an input basic signal, Beta is a phase-shifting signal, cos (wt) is a phase-locked loop output cosine, sin (wt) is a phase-locked loop output synchronous sine, D is a D-axis component under a static coordinate system, and Q is a Q-axis component under the static coordinate system.
6. The harmonic rejection static quantity output control method for a single phase electrical system as set forth in claim 5, wherein said PI regulation on D-axis and Q-axis is:
wherein, KpFor adjustment of the comparison, KiFor integral adjustment.
7. The harmonic-suppression static quantity output control method for the single-phase electric system according to claim 6, wherein the PI-regulated fundamental wave signal is subjected to DQ inverse transformation into:
A＝D*cos(wt)-Q*sin(wt)；
wherein D is a D-axis component in a static coordinate system, Q is a Q-axis component in the static coordinate system, cos (wt) is a phase-locked loop output cosine, sin (wt) is a phase-locked loop output synchronous sine, and A is an output signal.
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