CN108696144B - Interleaved flyback DC/DC hardware modulation compensation circuit - Google Patents
Interleaved flyback DC/DC hardware modulation compensation circuit Download PDFInfo
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- CN108696144B CN108696144B CN201810830241.7A CN201810830241A CN108696144B CN 108696144 B CN108696144 B CN 108696144B CN 201810830241 A CN201810830241 A CN 201810830241A CN 108696144 B CN108696144 B CN 108696144B
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- 239000003990 capacitor Substances 0.000 claims abstract description 16
- 238000012937 correction Methods 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 9
- 238000013139 quantization Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000011217 control strategy Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 241000965477 Darksidea delta Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33538—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only of the forward type
- H02M3/33546—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only of the forward type with automatic control of the output voltage or current
- H02M3/33553—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only of the forward type with automatic control of the output voltage or current with galvanic isolation between input and output of both the power stage and the feedback loop
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H02J3/383—
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The application relates to an interleaving flyback DC/DC hardware modulation compensation circuit, which comprises a photovoltaic panel, a direct-current side capacitor, an interleaving flyback DC/DC converter, an inverter bridge, an output filter, a power grid and a hardware compensation module, wherein the photovoltaic panel is connected with the DC side capacitor; the application has the functions of insulating and isolating the input side and the output side, can cope with the situations that in practice, the circuit is greatly interfered by electromagnetic interference and the circuit components have differences, has wide applicable voltage range and wide applicable temperature range, and improves the current situation that the switching tubes of the prior staggered flyback converter work inconsistently; the application only adds a modulation signal compensation circuit, does not increase the volume of the existing topological structure, ensures that the output waveform of the converter is more stable, provides smoother voltage for the inverter circuit of the later stage, and can effectively reduce the fluctuation of output power.
Description
Technical Field
The application relates to the technical field of solar power generation, in particular to an interleaving flyback DC/DC hardware modulation compensation circuit in the design of a two-stage photovoltaic grid-connected system.
Background
Solar energy is used as a clean energy source and widely applied to the power industry, in the research of a two-stage type low-power photovoltaic power generation system, an interleaving flyback converter (interleaved flyback inverter) is often used as a primary DC/DC circuit boosting part, and the output voltage fluctuation condition of the interleaving flyback DC/DC circuit directly influences the efficiency and conversion performance of a later-stage inverter circuit, so that the control of the interleaving flyback circuit is one of difficulties in system design. The control strategy of the common staggered flyback converter is related to the working mode of the converter, the control of the DCM mode mainly depends on an MPPT link, and the network access current obtained by the MPPT is compared with a triangular carrier wave to obtain an SPWM driving signal; the control of the BCM mode adopts current spike control, but the control is more complex than the control strategy of the DCM mode, and is not beneficial to popularization.
The literature T.Lodh, N.Pragallapati and v. agarwal, "An improved control scheme for interleaved flyback converter based micro-inverter to achieve high efficiency,"2016 IEEE 1st International Conference on Power Electronics,Intelligent Control and Energy Systems (ICPEICES), delhi,2016, pp.1-6, propose an optimal control strategy based on an interleaved flyback micro-inverter, which is adapted to various instantaneous powers to a suitable operation mode, thereby improving the working efficiency of the circuit, but the control strategy has rather high requirements on the running speed of the processor, increasing the cost of the detection circuit, and the control method is relatively complex, which is unfavorable for wide-range use.
Disclosure of Invention
The application provides an interleaving flyback DC/DC hardware modulation compensation circuit, which solves the problems of unbalanced interleaving flyback output voltage and fluctuation of output power in the prior art.
In order to achieve the above purpose, the technical scheme of the application is as follows:
the staggered flyback DC/DC hardware modulation compensation circuit is characterized in that: the device comprises a photovoltaic panel, a direct-current side capacitor, an interlaced flyback DC/DC converter, an inverter bridge, an output filter, a power grid and a hardware compensation module;
the photovoltaic panel is connected with the direct-current side capacitor and the staggered flyback DC/DC converter in parallel;
the staggered flyback DC/DC converter comprises two independent first flyback converters and a second flyback converter with consistent parameters; the first flyback converter comprises a transformer T1, a main power switch SW11 at the primary side of the transformer T1, a body diode D11 in anti-parallel connection with the main power switch SW11, a rectifying diode D1 at the secondary side of the transformer T1 and a buffer capacitor C1; the second flyback converter comprises a transformer T2, a main power switch SW21 at the primary side of the transformer T2, a body diode D21 which is in anti-parallel connection with the main power switch SW21, a rectifying diode D2 at the secondary side of the transformer T2 and a buffer capacitor C2;
the inverter bridge comprises a single-phase full-bridge inverter circuit, wherein the input side of the single-phase full-bridge inverter circuit is connected with the output of the staggered flyback DC/DC converter, and the output is connected with an output filter and a power grid;
the hardware compensation module comprises a double closed loop module, a current correction module, a load sharing compensation module and a signal modulation module; the input of the current correction module is the current of the staggered flyback DC/DC converter, the output of the current correction module is connected with the input of the load sharing compensation module, the output of the load sharing compensation module and the output of the double closed loop are connected with the input of the signal modulation module, and the output of the signal modulation module is the duty ratio of the final control switch tube.
Further, the double closed loop module comprises a current compensation link and a voltage feedforward link, wherein the input of the current compensation link is connected with the current acquisition circuit, and the input of the voltage feedforward link is connected with the voltage acquisition circuit.
Further, the load sharing compensation module comprises a filtering module and a compensation quantization module, wherein the input side of the filtering module is connected with the current correction module, and the output side of the filtering module is connected with the compensation quantization module.
Further, the staggered flyback DC/DC hardware modulation compensation circuit is externally connected with an electrical parameter acquisition module, a protection circuit, an alarm module and a microprocessor;
the electrical parameter acquisition module comprises an input voltage and input current acquisition module, an output voltage and output current acquisition module and a power grid voltage and power grid current acquisition module, and is respectively connected with the input of the photovoltaic panel, the output of the staggered flyback converter and the power grid side;
the protection circuit comprises a relay and an electromagnetic drive, wherein the relay is used for connecting the filter circuit and a power grid, when the relay is closed, the system is connected with the power grid, and when the relay is disconnected, the system is disconnected from the power grid; the electromagnetic drive is connected with the microprocessor. The application has the beneficial effects that:
1. the staggered flyback DC/DC hardware modulation compensation circuit has the function of insulating and isolating an input side and an output side, can cope with the situation that the circuit is greatly interfered by electromagnetic waves and has differences in circuit components in practice, has wide applicable voltage range and wide applicable temperature range, and improves the current situation that the switching tubes of the conventional staggered flyback converter work inconsistently.
2. The staggered flyback DC/DC hardware modulation compensation circuit is only added with one modulation signal compensation circuit, the volume of the existing topological structure is not increased, the output waveform of the converter is ensured to be more stable, smoother voltage is provided for a later-stage inverter circuit, and fluctuation of output power can be effectively reduced.
Drawings
FIG. 1 is a block diagram of a photovoltaic grid-tie system with an interleaved flyback DC/DC hardware modulation compensation circuit of the present application;
FIG. 2 is a schematic diagram of a main circuit of a photovoltaic grid-connected system with an interleaved flyback DC/DC hardware modulation compensation circuit of the present application;
FIG. 3 is a schematic diagram of an interleaved flyback DC/DC hardware modulation compensation circuit of the present application;
FIG. 4 is a schematic circuit diagram of a photovoltaic grid-tied system with an interleaved flyback DC/DC hardware modulation compensation circuit of the present application;
Detailed Description
The application will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, related operations of the present application have not been shown or described in the specification in order to avoid obscuring the core portions of the present application, and may be unnecessary to persons skilled in the art from a detailed description of the related operations, which may be presented in the description and general knowledge of one skilled in the art.
The names of the symbols in fig. 2, 3 and 4 are as follows:
vpv—photovoltaic panel output voltage;
cdc—dc side capacitance;
t1 and T2, namely transformers corresponding to the first flyback converter and the second flyback converter;
SW11 and SW21, namely main power tubes corresponding to the first flyback converter and the second flyback converter;
SW12 and SW22, namely auxiliary power tubes corresponding to the first flyback converter and the second flyback converter;
d11, D21-body diodes antiparallel to the main power tube;
d12, D22—body diodes antiparallel with auxiliary power tubes;
d1, D2—rectifier diodes on the secondary sides of transformers T1, T2;
c1 and C2, namely buffer capacitors on secondary sides of transformers T1 and T2;
s1, S2, S3 and S4 are inverter bridge switching tubes;
lac, cac-AC side filter inductance, AC side filter capacitance;
vo-the output voltage of the staggered flyback type through the buffer capacitor;
d. delta d-duty ratio reference value of flyback main switching tube and duty ratio compensation quantity;
d1 and d2, namely the duty ratio corresponding to the flyback type 1 and flyback type 2 main power tube;
im1, im 2-the current flowing through the inductor in the converter;
ipv1, ipv2—input branch current after correction;
Δipv, Δipvref—error between input currents, reference error;
the application is further described below with reference to the accompanying drawings, and referring to fig. 1-4, the staggered flyback DC/DC hardware modulation compensation circuit comprises a photovoltaic panel, a direct-current side capacitor, a staggered flyback DC/DC converter, an inverter bridge, an output filter, a power grid (or load) and a hardware compensation module;
the photovoltaic panel is used as the input of the whole circuit and is connected with the direct-current side capacitor and the staggered flyback DC/DC converter in parallel;
the staggered flyback DC/DC converter comprises two independent first flyback converters and a second flyback converter with consistent parameters; the first flyback converter comprises a transformer T1, a main power switch SW11 at the primary side of the transformer T1, a body diode D11 in anti-parallel connection with the main power switch SW11, a rectifying diode D1 at the secondary side of the transformer T1 and a buffer capacitor C1; the second flyback converter comprises a transformer T2, a main power switch SW21 at the primary side of the transformer T2, a body diode D21 which is in anti-parallel connection with the main power switch SW21, a rectifying diode D2 at the secondary side of the transformer T2 and a buffer capacitor C2;
the inverter bridge comprises a single-phase full-bridge inverter circuit, wherein the input side of the single-phase full-bridge inverter circuit is connected with the output of the staggered flyback DC/DC converter, and the output is connected with the output filter and the power grid to realize grid-connected operation;
the hardware compensation module comprises a double closed loop module, a current correction module, a load sharing compensation module and a signal modulation module; the input of the current correction module is the current of the staggered flyback DC/DC converter, the output of the current correction module is connected with the input of the load sharing compensation module, the output of the load sharing compensation module and the output of the double closed loop are connected with the input of the signal modulation module, and the output of the signal modulation module is the duty ratio of the final control switch tube.
The double closed loop module comprises a current compensation link and a voltage feedforward link, wherein the input of the current compensation link is connected with the current acquisition circuit, and the input of the voltage feedforward link is connected with the voltage acquisition circuit; the current compensation link and the voltage feedforward link jointly determine a modulation signal, and control the switching tube to be conducted so as to meet the requirement of output waveforms.
The current correction module is used for carrying out single-period average treatment on the current in the on period of the switching tube of the staggered flyback DC/DC converter, and the current detection of the staggered flyback DC/DC converter is connected with the input current correction module.
The load sharing compensation module comprises a filtering module and a compensation quantization module, wherein the input side of the filtering module is connected with the current correction module, the output side of the filtering module is connected with the compensation quantization module, the error of the input current of two branches is utilized to compensate the modulation signal of each branch switching tube, the consistency of the conduction time of the input switching tube is ensured, and the output voltage of the converter is stabilized.
The signal modulation module is a modulation circuit, compensates the duty ratio reference value by using the duty ratio compensation quantity, and finally outputs a new modulation signal to control the staggered flyback type changer to work.
The staggered flyback DC/DC hardware modulation compensation circuit is also externally connected with an electrical parameter acquisition module, a protection circuit, an alarm module and a microprocessor; the electrical parameter acquisition module comprises an input voltage and input current acquisition module, an output voltage and output current acquisition module and a power grid voltage and power grid current acquisition module, and is respectively connected with the input of the photovoltaic panel, the output of the staggered flyback converter and the power grid side;
the protection circuit comprises a relay and an electromagnetic drive, the relay is used for connecting the filter circuit and a power grid, when the relay is closed, the system is in a grid-connected state, and when the relay is opened, the system is in a grid-off state; the electromagnetic drive is connected with the microprocessor.
The hardware modulation compensation circuit schematic diagram of the application shown in fig. 3 is used for generating a duty ratio reference value by current compensation and voltage feedforward, the current corrector recalculates the input branch current according to the current flowing through the inductors in the two single-ended flyback converters and the corresponding duty ratio, the error between the input currents and the reference error pass through the load compensator to obtain a duty ratio compensation quantity, and the signal modulation module outputs the duty ratio of the final control switching tube in combination with the duty ratio reference value.
The working procedure of the application is described as follows:
the application realizes the compensation of the switching-on signal of the switching tube of the staggered flyback converter, and leads the fluctuation of the output voltage to be small. Firstly, a current compensation circuit and a voltage feedforward circuit generate a duty ratio reference value d; secondly, the current rectifier recalculates the input branch current according to currents im1 and im2 flowing through an inductor in the converter and duty ratios d1 and d2 to obtain ipv1 and ipv2, and the error delta ipv between the input currents of the ipv1 and ipv2 and the reference error delta ipvref pass through the load compensator to obtain a duty ratio compensation quantity delta d; finally, the microcontroller outputs the duty ratios d11, d12, d21 and d22 of the flyback converter by combining the duty ratio basic value d and the compensation quantity Deltad; when overvoltage and overcurrent conditions exist in the circuit, the microcontroller outputs an electromagnetic disconnection signal, grid connection operation is not performed any more, and stable operation of a power grid is protected.
TABLE 1 Compensation quantity State for different cases
As can be seen from table 1, the magnitude relationship between ipv1 and ipv2 determines the direction of the change of the compensation amount, so the working process is as follows:
the corrected current ipv1> ipv2 has Δipv >0, and after calculation with the reference error value Δipvref, Δipv '<0, the load sharing compensator calculates a suitable compensation amount Δd according to the value of Δipv', and has Δd <0, which indicates that the output voltages of the flyback 1 converter and the flyback 2 converter have large difference, and when the switch is switched, the output voltage fluctuation increases, so that the conduction of the flyback 1 converter should be reduced, the conduction of the flyback 2 converter is increased, d11 is reduced and d21 is increased in combination with the reference value d;
2) After corrected current ipv1=ipv2, delta ipv=0 and reference error value delta ipvref are calculated, delta ipv' =0 and compensation quantity delta d=0, which indicates that the output voltage fluctuation of the flyback converter is small at this time, the current switching state should be kept, and d11 and d21 are kept unchanged;
3) The corrected current ipv1< ipv2 has Δipv <0, and after calculation with the reference error value Δipvref, Δipv '>0, the load sharing compensator calculates a suitable compensation amount Δd according to the value of Δipv', and has Δd >0, and is obtained by 1) in the same way, at this time, the output difference of the flyback 1 and flyback 2 converters is large, when the switch is switched, the output voltage fluctuation increases, the turn-off of the flyback 1 converter should be reduced, the turn-off of the flyback 2 converter is increased, d11 is reduced by combining the reference value d, and d21 increases.
The foregoing description of the application has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the application pertains, based on the idea of the application.
Claims (1)
1. The staggered flyback DC/DC hardware modulation compensation circuit is characterized in that: the device comprises a photovoltaic panel, a direct-current side capacitor, an interlaced flyback DC/DC converter, an inverter bridge, an output filter, a power grid and a hardware compensation module;
the photovoltaic panel is connected with the direct-current side capacitor and the staggered flyback DC/DC converter in parallel;
the staggered flyback DC/DC converter comprises two independent first flyback converters and a second flyback converter with consistent parameters; the first flyback converter comprises a transformer T1, a main power switch SW11 at the primary side of the transformer T1, a body diode D11 in anti-parallel connection with the main power switch SW11, a rectifying diode D1 at the secondary side of the transformer T1 and a buffer capacitor C1; the second flyback converter comprises a transformer T2, a main power switch SW21 at the primary side of the transformer T2, a body diode D21 which is in anti-parallel connection with the main power switch SW21, a rectifying diode D2 at the secondary side of the transformer T2 and a buffer capacitor C2;
the inverter bridge comprises a single-phase full-bridge inverter circuit, wherein the input side of the single-phase full-bridge inverter circuit is connected with the output of the staggered flyback DC/DC converter, and the output is connected with an output filter and a power grid;
the hardware compensation module comprises a double closed loop module, a current correction module, a load sharing compensation module and a signal modulation module; the input of the current correction module is the current of the staggered flyback DC/DC converter, the output of the current correction module is connected with the input of the load sharing compensation module, the output of the load sharing compensation module and the output of the double closed loop are connected with the input of the signal modulation module, and the output of the signal modulation module is the duty ratio of the final control switch tube;
the double closed loop module comprises a current compensation link and a voltage feedforward link, wherein the input of the current compensation link is connected with the current acquisition circuit, and the input of the voltage feedforward link is connected with the voltage acquisition circuit;
the load sharing compensation module comprises a filtering module and a compensation quantization module, wherein the input side of the filtering module is connected with the current correction module, and the output side of the filtering module is connected with the compensation quantization module;
the staggered flyback DC/DC hardware modulation compensation circuit is externally connected with an electrical parameter acquisition module, a protection circuit, an alarm module and a microprocessor;
the electrical parameter acquisition module comprises an input voltage and input current acquisition module, an output voltage and output current acquisition module and a power grid voltage and power grid current acquisition module, and is respectively connected with the input of the photovoltaic panel, the output of the staggered flyback converter and the power grid side;
the protection circuit comprises a relay and an electromagnetic drive, wherein the relay is used for connecting the filter circuit and a power grid, when the relay is closed, the system is connected with the power grid, and when the relay is disconnected, the system is disconnected from the power grid; the electromagnetic drive is connected with the microprocessor.
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| CN201810830241.7A CN108696144B (en) | 2018-07-24 | 2018-07-24 | Interleaved flyback DC/DC hardware modulation compensation circuit |
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| CN201810830241.7A CN108696144B (en) | 2018-07-24 | 2018-07-24 | Interleaved flyback DC/DC hardware modulation compensation circuit |
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| CN108696144B true CN108696144B (en) | 2023-11-28 |
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| KR20140004379A (en) * | 2012-07-02 | 2014-01-13 | 전남대학교산학협력단 | Interleaved flyback converter for led constant-current control |
| CN106787911A (en) * | 2017-02-14 | 2017-05-31 | 苏州大学 | A kind of miniature photovoltaic grid-connected inverter and control method |
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| CN208461700U (en) * | 2018-07-24 | 2019-02-01 | 西安工业大学 | A kind of hardware modulation compensated circuit in photovoltaic parallel in system |
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2018
- 2018-07-24 CN CN201810830241.7A patent/CN108696144B/en active Active
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| KR20140004379A (en) * | 2012-07-02 | 2014-01-13 | 전남대학교산학협력단 | Interleaved flyback converter for led constant-current control |
| WO2018120483A1 (en) * | 2016-12-27 | 2018-07-05 | 广东百事泰电子商务股份有限公司 | Pfc interleaved flyback full bridge based intelligent sine-wave voltage conversion circuit |
| CN106787911A (en) * | 2017-02-14 | 2017-05-31 | 苏州大学 | A kind of miniature photovoltaic grid-connected inverter and control method |
| CN208461700U (en) * | 2018-07-24 | 2019-02-01 | 西安工业大学 | A kind of hardware modulation compensated circuit in photovoltaic parallel in system |
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