CN116599093B - Control method for participation of alkaline solution electrolysis hydrogen production in deep peak regulation of power grid - Google Patents
Control method for participation of alkaline solution electrolysis hydrogen production in deep peak regulation of power grid Download PDFInfo
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- CN116599093B CN116599093B CN202310444959.3A CN202310444959A CN116599093B CN 116599093 B CN116599093 B CN 116599093B CN 202310444959 A CN202310444959 A CN 202310444959A CN 116599093 B CN116599093 B CN 116599093B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/60—Constructional parts of cells
- C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC power output without possibility of reversal 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
- H02M7/217—Conversion of AC power input into DC power output without possibility of reversal 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
- H02M7/219—Conversion of AC power input into DC power output without possibility of reversal 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 in a bridge configuration
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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
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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Abstract
The invention provides a control method for participation of alkaline solution electrolysis in deep peak regulation of a power grid. The invention can realize frequency response, the mechanism is droop control, and the frequency response can be used as frequency support resource of a power grid. The invention can also ensure that the maximum hydrogen production can be realized under different working conditions, and solves the problems of narrow operation range and low efficiency under low-load working conditions in the traditional hydrogen production strategy. By using the invention, the wide-range and high-efficiency hydrogen production of the alkaline electrolysis tank can be realized, so that the frequency response of the power grid with wider range can be realized. And the droop factor at the rectifier stage P f is greater, thus participating more deeply in peak shaving.
Description
Technical Field
The invention relates to a control method for participation of alkaline solution electrolysis in deep peak regulation of a power grid, belonging to the operation control technology of a hydrogen-electricity coupling system in the field of new energy.
Background
On one hand, the hydrogen energy industry is greatly improved at present, and the great development of hydrogen energy becomes the development trend of the future energy industry. Compared with the traditional fossil energy, the hydrogen energy has the advantages of high heat value, only water as a reaction product and the like, and is an ideal alternative energy. From the viewpoint of the type of electrolytic cell used, electrolytic hydrogen production techniques are classified into proton exchange membrane (Polymer Electrolyte Membrane, PEM) electrolysis, solid Oxide (Solid Oxide) electrolysis, proton ceramic cell (Protonic Ceramic Electrolysis Cell, PCEC) electrolysis, and alkaline cell electrolysis (ALKALINE WATER Electrolysis, AWE). Among the listed electrolytic hydrogen production technologies, the alkaline solution electrolytic hydrogen production technology is the most mature.
On the other hand, the trend of power electronics of the power grid is more obvious, and in order to improve the inertia of the power grid, it is imperative that the frequency stability of the power grid is improved by utilizing different frequency support resources in all directions of source-grid-load-storage. Although the conventional alkaline liquid electrolyzer hydrogen production control strategy is based on sagging control, from the viewpoint of safe production, the conventional alkaline liquid electrolyzer hydrogen production control strategy has a relatively large minimum operating power, in other words, the conventional alkaline liquid electrolyzer hydrogen production control strategy with frequency sagging control has the defect of narrow operating range and insufficient frequency support resource, and cannot participate in power grid peak shaving deeply.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a control method for participating in deep peak regulation of a power grid by alkaline liquid electrolysis hydrogen production. The invention solves the problems that the traditional hydrogen production circuit based on the sagging control side lye electrolyzer has a narrow power regulation range and cannot participate in the power grid peak regulation more deeply, and effectively expands the frequency support resources of the power system on the premise of ensuring the hydrogen production purity, so that hydrogen production equipment participates in the power grid peak regulation more deeply.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The control method for the deep peak regulation of the power grid is characterized in that alkaline solution electrolysis hydrogen production is participated in the control method, hydrogen production equipment of the alkaline solution electrolysis hydrogen production is connected with the external power grid through a circuit, the circuit comprises a rectifying circuit, a Buck converter circuit and a pulse generation circuit which are sequentially connected, the alkaline solution electrolysis hydrogen production is performed by utilizing electric energy of the external power grid, the power of the alkaline solution electrolysis hydrogen production is controlled, and the deep peak regulation of the power grid is participated in, wherein the control method comprises the following steps:
collecting the frequency f and the output current of an external power grid in real time;
judging a reference value of a rectifying circuit based on the frequency of an external power grid, wherein the rectifying circuit performs droop control by adopting any one of a droop control mode of i d -f or P-f based on the acquired reference value, i d is current of the rectifying circuit, P is active power, when the frequency of the external power grid is f min, the reference input current i dref =0 of the rectifying circuit is referenced to be active power P ref =0, so that the hydrogen production equipment is cut off from the power grid, when the frequency of the system is f max, the reference input current i dref＝imax of the rectifying circuit is referenced to be active power P ref＝PN;imax, the reference current i dref＝i0+k*(f-fN of the external power grid is input to the rectifying circuit under the rated operation condition of the hydrogen production equipment, when the frequency of the system is f min＜f＜fmdx, the reference current i dref＝i0+k*(f-fN of the rectifying circuit is referenced to be active power P ref＝PN+k*(f-fN), i 0 is equal to i max,PN is rated power of an electrolytic tank, f N is rated frequency of the external power grid, f min is the lowest frequency of the hydrogen production equipment is allowed to operate, and f max is equal to the rated frequency of the hydrogen production equipment; min The current input by the external power grid to the rectifying circuit is represented under the condition of the frequency f min;
The control strategy of the Buck converter circuit is determined based on the frequency of an external power grid, the Buck converter circuit is controlled, when the power grid frequency f set3,fset3 is a frequency reference value, f min＜fset3＜fmax,fset3 is generated through a hysteresis circuit, reference current I set1＝-kp(uset1 -u is generated, u represents the voltages at two sides of a polar capacitor C, u set1 represents the reference value of the voltages u at two sides of the polar capacitor C under the control strategy of constant current of a direct current inductor L, the reference value is reasonably selected according to the maximum voltage tolerated by the voltages at the two sides of the polar capacitor C, then a current loop control strategy is used for adjusting the duty ratio D set1＝kl(Iset1-I),kl of a field effect transistor D 1 in the Buck converter circuit in real time to represent the current loop control parameter of the Buck converter circuit, I represents the current of an inductor L in the Buck converter circuit, and when the power grid frequency f set4,fmin＜fset4＜fset3 is used for enabling I set1＝Iop,Iop to represent the corresponding pulse current amplitude under the condition of maximum efficiency by adopting the control strategy of constant current of the direct current inductor L, and the duty ratio D set1＝kl(Iset1 -I 1 in the Buck converter circuit is adjusted in real time.
And determining a control strategy of the pulse generating circuit based on the frequency of an external power grid, and controlling the pulse generating circuit, wherein when the power grid frequency f set3 is adopted, the second-stage pulse generating circuit adopts a control strategy with a constant duty ratio, the duty ratio D set2 =0 of the field effect transistor D 2 in the pulse generating circuit is controlled, when the power grid frequency f set4 is adopted, the second-stage pulse generating circuit adopts a control strategy with constant voltage of the capacitor C, the duty ratio D set2＝kll(uset2-u);uset2 of the field effect transistor D 2 in the pulse generating circuit is controlled to represent a reference value u under the control strategy with constant voltage of the capacitor C, and the reference value is reasonably selected according to the maximum voltage of voltage tolerance at two side ends of the polar capacitor C.
Compared with the traditional large power grid hydrogen production technology, the invention has two outstanding advantages, namely, the frequency response can be realized, the mechanism is sagging control, and the invention can be used as the frequency support resource of the power grid. Secondly, the multi-mode self-optimizing technology has the advantages that the maximum hydrogen production efficiency can be guaranteed under different working conditions, and the problems of narrow operation range and low efficiency under low-load working conditions in the traditional hydrogen production strategy are solved. By using the invention, the wide-range and high-efficiency hydrogen production of the alkaline electrolysis tank can be realized, so that the frequency response of the power grid with wider range can be realized. And in the rectifier stage the droop factor of P-f is larger, thus participating more deeply in peak shaving.
Further, the circuit comprises a six-bridge-arm switch tube D 3, an inductor L s, an inductor L, a polarity capacitor C, a fast recovery diode D 1, a field effect tube D 1, a fast recovery diode D 2 and a field effect tube D 2, wherein an external power grid is connected with a first end of the inductor L s, a second end of the inductor L s is connected with an alternating current port of the six-bridge-arm switch tube D 3, a direct current output side of the bridge-arm switch tube D 3 is connected with the polarity capacitor C in parallel, the field effect tube D 1 is connected in series after the polarity capacitor C, a source side of the field effect tube D 1 is connected with the fast recovery diode D 1 in parallel, a cathode side of the fast recovery diode D 1 is connected with the inductor L in series, and the inductor L is connected with the field effect tube D 2 in parallel. The field effect transistor D 2 is connected in series with the fast recovery diode D 2.
Further, the rectifying circuit performs droop control by adopting any one of the droop control modes of i d -f or P-f based on the acquired reference value, and a modulation wave obtained by dividing a modulation wave output after the droop control by a direct-current side capacitor voltage u in the Buck converter circuit is used as a control signal of the rectifying circuit.
Further, the period T 2 of the PWM control signal of the fet d 2 in the pulse generating circuit has a value range of [0.05s,0.5s ].
Further, PWM control signals of the field effect transistor d 1 in the rectifying circuit and the Buck converter circuit adopt high-frequency modulation carrier waves.
The invention designs a control method for the deep peak regulation of the power grid, which is used for the alkaline liquid electrolytic hydrogen production, wherein the traditional droop control electrolytic hydrogen production circuit allows the lowest output power to be higher, the active power adjustment range is lower, the frequency support resource which can be provided is lower, the circuit topology and the control mode adopted by the invention can be used for the high-efficiency electrolytic hydrogen production under different working conditions, the active power adjustment range can be improved on the basis of not changing the electric energy quality, and meanwhile, the mode of dividing the modulation wave by the direct current side capacitor voltage is adopted, so that the inter-harmonic wave is further suppressed, and the electric energy quality of the power grid is improved.
Drawings
FIG. 1 is a schematic diagram of a control method for participation of alkaline liquid electrolysis in deep peak regulation of a power grid, which is provided by the embodiment of the application;
FIG. 2 is a voltage-current waveform diagram of a hydrogen production electrolytic cell connected to the output side of a circuit according to an embodiment of the present application;
FIG. 3 is a graph showing the comparison of the efficiency of a hydrogen production electrolyzer connected to the output side of a circuit according to an embodiment of the present application in a proposed control scheme for pulse electrolysis versus a control scheme for DC electrolysis.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
For a thorough understanding of the present invention, detailed structures and steps are set forth in the following description, and are further described in connection with the accompanying drawings and detailed description to illustrate the presently contemplated embodiments of the invention.
According to the control method for the deep peak regulation of the power grid, disclosed by the invention, the external power grid is connected with the direct current circuit through the rectifying circuit, the output end of the direct current circuit is connected with the electrolytic tank, the electric energy of the external power grid is utilized for carrying out the alkaline electrolysis hydrogen production, and the deep peak regulation of the power grid is participated by controlling the power of the alkaline electrolysis hydrogen production. The direct current circuit topology adopts a structure that two stages of sub-circuits are connected in series, and comprises a Buck converter circuit and a pulse generation circuit, wherein the direct current output side of the rectifier circuit is connected with the Buck converter circuit, and the Buck converter circuit achieves the purpose of outputting constant current so as to supply the next stage of direct current circuit. Meanwhile, in order to restrain the grid current ripple caused by the direct-current side pulse electrolysis current working mode, a capacitor voltage buffering mode is adopted. The back of the Buck converter circuit is connected with a pulse generation circuit, the pulse generation circuit adopts the topological form of a Boost circuit, and the direct current output by the Buck converter circuit is converted into the form of pulse wave to supply power to the electrolytic tank. Fig. 1 is a circuit topology and a control strategy block diagram thereof of the present invention using a Buck converter as a first stage Buck converter circuit. As shown in FIG. 1, the rectifying circuit comprises a six-bridge arm switch tube D 3 and an inductor L s, the Bick converting circuit comprises an inductor L, a polar capacitor C, a fast recovery diode D 1 and a field effect tube D 1, and the pulse generating circuit comprises an inductor L, a fast recovery diode D 2 and a field effect transistor D 2. The Bick converter circuit and the pulse generation circuit are connected and then combine the inductors to enable the two circuits to share the same inductor, specifically, an external power grid is connected with a first end of an inductor L s, a second end of the inductor L s is connected with an alternating current port of a six-bridge arm switching tube D 3, a direct current port of the six-bridge arm switching tube D 3 is connected with a polarity capacitor C in parallel, a negative electrode of the polarity capacitor C is connected with the ground, a positive electrode of the polarity capacitor C is connected with a collector electrode of a field effect tube D 1, a grid electrode of the field effect tube D 1 is connected with a control signal, a source electrode of the field effect tube D 1 is connected with a cathode of a fast recovery diode D 1, an anode of the fast recovery diode D 1 is connected with the ground, a cathode of the D 1 is simultaneously connected with a first end of the inductor L, a second end of the inductor L 2 is connected with a collector electrode of the field effect tube D 2, a source electrode of the field effect tube D 2 is connected with the ground, a grid electrode of the hydrogen production device is connected with the control signal, a positive electrode of the electrolytic cell is connected with the cathode of the fast recovery diode D 2, and the cathode of the electrolytic cell is connected with the ground.
According to the control method for the deep peak regulation of the power grid in the alkaline liquid electrolysis hydrogen production, the characteristic that the sagging control rectification circuit can realize frequency response to the power grid is utilized, and the hydrogen production power is regulated. And then the input current is converted into direct current through the Buck converter circuit. Under the condition of low input power, the input power is reduced as much as possible to raise the power regulation range, the electrolytic tank is regarded as a load, and the fluctuation of the power of the electrolytic tank can deeply influence the change of the power grid frequency, so that the purpose of deep peak shaving is achieved. And finally, converting the direct current of the inductor L into output pulse current by using a pulse generating circuit.
Specifically, the method comprises the following steps:
The droop control rectifying circuit is utilized to realize frequency response to the power grid, and hydrogen production power is adjusted:
When the frequency f of the external power grid is not less than f min, the reference input current i dref =0 of the rectifier circuit and the reference active power P ref =0 are arranged, so that the hydrogen production equipment is cut off from the power grid, when the frequency f of the system is not less than f max, the reference input current i dref＝imax of the rectifier circuit and the reference active power P ref＝PN;imax are shown as the current input to the rectifier circuit by the external power grid under the rated operation condition of the electrolytic cell, and when the frequency f min＜f＜fmax of the system is arranged, the reference current i dref＝i0+k*(f-fN of the rectifier circuit and the reference active power P ref＝PN+k*(f-fN are shown as the reference active power. Wherein i 0 is equal to i max,PN, which is the rated power of the electrolytic tank, f N is the rated frequency of the external power grid, f min is the lowest frequency allowed to operate by the hydrogen production circuit, f max is the highest frequency allowed to operate by the hydrogen production equipment according to the requirements of the external power grid on the power grid frequency in each place, and f max is equal to the rated frequency; min And the current input by the external power grid to the rectifying circuit is represented under the condition of the frequency f min. The rectifying circuit performs droop control by adopting any one of the droop control modes of i d -f or P-f based on the acquired reference value of the rectifying circuit. Where i d is the input current of the rectifier circuit, P is the active power, and i d is proportional to the active power. Taking i d -f droop control as an example, droop control refers to adjusting the power output according to frequency. As shown in fig. 1, the frequency f and the output current of an external power grid are acquired in real time Wherein the external grid voltage is maintained at a constant valueAccording to Representing the current input to the electrolyzer from the external grid, the active power P can be calculated. Current is applied toThe PARK conversion is to convert phasors into d-axis, q-axis and 0-axis variables, and in general, d-axis current represents active current, q-axis current represents reactive current, and 0-axis current represents unbalanced current, and 0-axis current is not considered. Under the condition that the power grid is used for producing hydrogen by pure active power, the output active power P is in direct proportion to the d-axis input current i d. i d and a given i dref are subjected to a droop control link, so that the frequency w and the voltage amplitude U can be obtained, and the synthesized three-phase voltage coordinate is transformed to the dq axis to obtain Udref and Uqref. And finally, performing double closed-loop control on the voltage and the current, generating a driving control signal s 3 required by controlling the six-bridge-arm switching tube d 3 by the SPWM, and inputting the driving control signal s 3 to the six-bridge-arm switching tube d 3.
Furthermore, the mode of dividing the modulation wave by the direct-current side capacitor voltage u is adopted to further inhibit the inter-harmonic wave, so that the electric energy quality of the power grid is improved.Where s 3 represents a modulated wave outputted after droop control, and s' 3 represents a modulated wave obtained by dividing the modulated wave by the dc side capacitor voltage u.
If the external grid frequency is too low, resulting in a lower active power output, the electrolyzer needs to be disconnected from the grid for safety purposes if the conventional droop control based direct current hydrogen production scheme is operated at such low input power. However, in the present invention, as shown in fig. 1, a two-stage dc circuit is adopted, the first stage is a Buck converter circuit, when the power grid frequency f > f set3,fset3 is a frequency reference value, f min＜fset3＜fmax,fset3 is generated by a hysteresis circuit, which generates a reference current I set1＝-kp(uset1-u),kp to represent a control parameter of a proportional link of the Buck converter circuit, u represents voltages at two sides of a polar capacitor C, u set1 represents a reference value of voltages u at two sides of the polar capacitor C under a control strategy of adopting a constant dc inductor L current, and the reference value is reasonably selected according to the maximum voltage tolerated by the voltages at two sides of the polar capacitor C. And then using a current loop control strategy to adjust the duty ratio D set1＝kl(Iset1 -I) of the field effect transistor D 1 in real time as a control signal of the field effect transistor D 1, wherein k l represents the current loop control parameter of the Buck converter circuit, I represents the current of the inductor L, and I set1 represents the reference value, and when the power grid frequency f < f set4,fmin＜fset4＜fset3, the duty ratio D set1＝kl(Iset1 -I of the field effect transistor D 1 is adjusted in real time by adopting a control strategy that the current of the direct current inductor L is constant so that the I set1＝Iop,Iop represents the corresponding pulse current amplitude under the condition of maximum efficiency. Similarly, when the power grid frequency f > f set3, the second-stage pulse generating circuit adopts a control strategy with a constant duty ratio, D sset2 =0, and when the power grid frequency f < f set4, the second-stage pulse generating circuit adopts a control strategy with a constant voltage of a capacitor C, wherein the duty ratio of the field effect transistor D 2 is D set2＝kll(uset2 -u) as a control signal of the field effect transistor D 2. k ll represents a control parameter of a proportional link of the pulse generating circuit, u set2 represents a reference value of u under a control strategy of adopting constant voltage of the capacitor C, u represents the voltage of the two sides of the capacitor C, and u is reasonably selected according to the maximum voltage tolerated by the voltage of the two sides of the capacitor C. Wherein, the switching period of d 2 is T 2,T2, and the value range is [0.05s,0.5s ].
The voltage U ele of the electrolytic cell is collected in real time, the output power of the power grid is equal to the input power of the electrolytic cell,
The invention utilizes the electric energy of an external power grid to carry out alkaline liquid electrolysis hydrogen production, and participates in deep peak regulation of the power grid by controlling the power of the alkaline liquid electrolysis hydrogen production.
Furthermore, the PWM control signals of the rectifying circuit and the field effect transistor d 1 adopt high-frequency modulation carrier waves. The switching period is 10 mus.
Fig. 2 is a waveform diagram of the current and voltage input to the electrolyzer at low frequency (48.5 Hz) according to the present application, and it can be seen that the current and voltage input to the electrolyzer at low frequency are both in the form of pulse waves. Thus, the hydrogen production current of the electrolytic tank can be greatly improved.
FIG. 3 is a graph comparing the efficiency curves of the pulse electrolysis hydrogen production and the direct current electrolysis hydrogen production adopted by the application, and can be seen that the pulse electrolysis efficiency is much higher than that of the direct current electrolysis under the condition of low input power, thereby greatly improving the operation range of the electrolytic tank and realizing that the alkaline electrolysis hydrogen production participates in the deep peak regulation of the power grid.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary or exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (5)
1. A control method for the participation of alkaline solution electrolysis hydrogen production in deep peak regulation of a power grid is characterized in that hydrogen production equipment for alkaline solution electrolysis hydrogen production is connected with an external power grid through a circuit, the circuit comprises a rectifying circuit, a Buck converter circuit and a pulse generation circuit which are sequentially connected, the alkaline solution electrolysis hydrogen production is carried out by utilizing electric energy of the external power grid, the power of the alkaline solution electrolysis hydrogen production is controlled, and the participation of the alkaline solution electrolysis hydrogen production in deep peak regulation of the power grid is specifically as follows:
collecting the frequency f and the output current of an external power grid in real time;
Judging a reference value of a rectifying circuit based on the frequency of an external power grid, wherein the rectifying circuit performs droop control by adopting any one of a droop control mode of i d -f or P-f based on the acquired reference value, i d is current of the rectifying circuit, P is active power, when the frequency of the external power grid is f min, the reference input current i dref =0 of the rectifying circuit is referenced to be active power P ref =0, so that the hydrogen production equipment is cut off from the power grid, when the frequency of the system is f max, the reference input current i dref＝imax of the rectifying circuit is referenced to be active power P ref＝PN;imax, the reference current i dref＝i0+k*(f-fN of the external power grid is input to the rectifying circuit under the rated operation condition of the hydrogen production equipment, when the frequency of the system is f min＜f＜fmax, the reference current i dref＝i0+k*(f-fN of the rectifying circuit is referenced to be active power P ref＝PN+k*(f-fN), i 0 is equal to i max,PN is rated power of an electrolytic tank, f N is rated frequency of the external power grid, f min is the lowest frequency of the hydrogen production equipment is allowed to operate, and f max is equal to the rated frequency of the hydrogen production equipment; min The current input by the external power grid to the rectifying circuit is represented under the condition of the frequency f min;
Determining a control strategy of a Buck converter circuit based on the frequency of an external power grid, and controlling the Buck converter circuit, wherein when the power grid frequency f set3,fset3 is a frequency reference value, f min＜fset3＜fmax,fset3 is generated through a hysteresis circuit, reference current I set1＝-kp(uset1-u),kp is generated to represent control parameters of a proportional link of the Buck converter circuit, u represents voltages at two sides of a polar capacitor C, u set1 represents reference values of voltages u at two sides of the polar capacitor C under the control strategy of constant current of a direct current inductor L and is reasonably selected according to the maximum voltage endured by the voltages at the two sides of the polar capacitor C;
And determining a control strategy of the pulse generating circuit based on the frequency of an external power grid, and controlling the pulse generating circuit, wherein when the power grid frequency f set3 is adopted, the second-stage pulse generating circuit adopts a control strategy with a constant duty ratio, the duty ratio D set2 =0 of the field effect transistor D 2 in the pulse generating circuit is controlled, when the power grid frequency f set4 is adopted, the second-stage pulse generating circuit adopts a control strategy with constant voltage of a capacitor C, the duty ratio D set2＝kll(uset2-u);kll of the field effect transistor D 2 in the pulse generating circuit is controlled to represent a control parameter of a proportional link of the pulse generating circuit, and u set2 represents a reference value u under the control strategy with constant voltage of the capacitor C, and the reference value u is reasonably selected according to the maximum voltage tolerance of two side end voltages of the polar capacitor C.
2. The method of claim 1, wherein the circuit comprises a six leg switch D 3, an inductor L s, an inductor L, a polarity capacitor C, a fast recovery diode D 1, a field effect transistor D 1, a fast recovery diode D 2, and a field effect transistor D 2, wherein an external power grid is connected to a first end of the inductor L s, a second end of the inductor L s is connected to an ac port of the six leg switch D 3, a dc output side of the six leg switch D 3 is connected in parallel with the polarity capacitor C, the polarity capacitor C is connected in series with the field effect transistor D 1, a source side of the field effect transistor D 1 is connected in parallel with the fast recovery diode D 1, a cathode side of the fast recovery diode D 1 is connected in series with the inductor L, the inductor L is connected in parallel with the field effect transistor D 2, and the field effect transistor D 2 is connected in series with the fast recovery diode D 2.
3. The method according to claim 1, wherein the rectifying circuit performs droop control by using any one of a droop control method of i d -f or P-f based on the obtained reference value, and a modulated wave obtained by dividing a modulated wave outputted after the droop control by a direct-current side capacitor voltage u in the Buck converter circuit is used as a control signal of the rectifying circuit.
4. The method of claim 1, wherein the period T 2 of the PWM control signal of the fet d 2 in the pulse generating circuit has a value in the range of 0.05s,0.5 s.
5. The method of claim 1, wherein PWM control signals for field effect transistor d 1 in the rectifier circuit and Buck converter circuit are high frequency modulated carrier waves.
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| WO2010048706A1 (en) * | 2008-10-30 | 2010-05-06 | Next Hydrogen Corporation | Power dispatch system for electrolytic production of hydrogen from wind power |
| WO2021208524A1 (en) * | 2020-04-13 | 2021-10-21 | 严强 | Off-grid electrolysis control method and structure independent of power grid |
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