CN115333391A - Cooperative inverter circuit and control method thereof - Google Patents

Cooperative inverter circuit and control method thereof Download PDF

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Publication number
CN115333391A
CN115333391A CN202211119755.4A CN202211119755A CN115333391A CN 115333391 A CN115333391 A CN 115333391A CN 202211119755 A CN202211119755 A CN 202211119755A CN 115333391 A CN115333391 A CN 115333391A
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China
Prior art keywords
inverter
assembly
alternating current
switch
power
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Pending
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CN202211119755.4A
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Chinese (zh)
Inventor
高道伟
陈鹏
孙帅
陈娟
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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Priority to CN202211119755.4A priority Critical patent/CN115333391A/en
Publication of CN115333391A publication Critical patent/CN115333391A/en
Pending legal-status Critical Current

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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
    • 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
    • H02J3/381—Dispersed generators
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a cooperative inverter circuit and a control method thereof, wherein the cooperative inverter circuit comprises: an alternating current output end; the direct current input end of each inverter assembly is used for being connected with a photovoltaic assembly, and the output end of each inverter assembly is used for being connected with an alternating current output end; the first switch is arranged between the direct current input ends of the two inverter assemblies in series; each inverter assembly is used for converting direct current output by the photovoltaic assembly which is connected with the inverter assembly into alternating current and outputting the alternating current; and/or when the first switch is conducted, the direct current output by the photovoltaic module corresponding to the other inverter module is converted into alternating current and then output. The photovoltaic power station control method can solve the problem that the yield of the photovoltaic power station is easily influenced by the damage of the inverter in the conventional photovoltaic system.

Description

Cooperative inverter circuit and control method thereof
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a cooperative inverter circuit and a control method thereof.
Background
With the continuous development of photovoltaic technology, the installed photovoltaic capacity of China is continuously increased, and the economic benefit of a photovoltaic power station is particularly important. In the design of the existing photovoltaic system, an inverter and a photovoltaic module are used in a single combination mode, when the inverter breaks down, the inverter can not work normally, or direct current output by the corresponding photovoltaic module can not be fully converted into alternating current and then output, so that the waste of the generated energy of the photovoltaic module is caused, and the income of a photovoltaic power station is greatly influenced.
Disclosure of Invention
The invention mainly aims to provide a cooperative inverter circuit, and aims to solve the problem that the yield of a photovoltaic power station is easily influenced by the damage of an inverter in the conventional photovoltaic system.
In order to achieve the above object, the present invention provides a cooperative inverter circuit, comprising:
an alternating current output terminal;
the direct current input end of each inverter assembly is used for being connected with a photovoltaic assembly, and the output end of each inverter assembly is used for being connected with an alternating current output end;
the first switch is arranged between the direct current input ends of the two inverter assemblies in series; wherein,
each inverter assembly is used for converting direct current output by the photovoltaic assembly connected with each inverter assembly into alternating current and outputting the alternating current;
and/or when the first switch is conducted, the direct current output by the photovoltaic module corresponding to the other inverter module is converted into alternating current and then output.
Optionally, each of the inverter assemblies comprises:
the direct current input end is used for being connected with a photovoltaic component and is also connected with the direct current input end of another inverter component through the first switch;
an inverter;
the first end of the second switch is connected with the direct current input end, the second end of the second switch is connected with the input end of the inverter, and the second switch is used for controlling the direct current input end to be electrically connected with the inverter when the second switch is switched on, so that the inverter converts direct current output by the direct current input end into alternating current and outputs the alternating current.
Optionally, the cooperative inverting circuit has the following operating modes:
when the photovoltaic power generation system works in a normal mode, the first switch is turned off, and the second switches of the two inverter assemblies are turned on, so that the two inverter assemblies convert direct current output by the photovoltaic assemblies which are respectively connected into the two inverter assemblies into alternating current and then output the alternating current;
when the photovoltaic module works in a first cooperation mode, the first switch and the second switch in one inverter assembly are both switched on, and the second switch in the other inverter assembly is switched off, so that the inverter assembly converts direct current output by the connected photovoltaic assembly into alternating current and then outputs the alternating current, and converts direct current output by the photovoltaic assembly corresponding to the other inverter assembly into alternating current and then outputs the alternating current;
when the photovoltaic inverter works in a second cooperation mode, the first switch and a second switch in the two inverter assemblies are both conducted, so that the two inverter assemblies convert direct current output by the photovoltaic assembly connected to the two inverter assemblies into alternating current and then output the alternating current, and convert direct current output by the photovoltaic assembly corresponding to the other inverter assembly into alternating current and then output the alternating current;
when the inverter is operated in a circuit breaking mode, the first switch and the second switch in the two inverter assemblies are both turned off, so that the two inverter assemblies stop operating.
Optionally, the cooperative inverting circuit further comprises:
the input end of each voltage conversion circuit is used for being connected with a photovoltaic module, the output end of each voltage conversion circuit is connected with the direct current input end of the inverter module, and the voltage conversion circuits are used for performing voltage conversion on direct current output by the photovoltaic modules and then outputting the direct current.
Optionally, the number of the inverter assemblies is multiple, the multiple inverter assemblies form two groups of inverter assembly units with the same number, and a first switch is arranged in series between a dc input end of one inverter assembly in the two groups of inverter assembly units and a dc input end of one inverter assembly in the other group of inverter assembly units.
Optionally, the cooperative inverting circuit further comprises:
the control end of the prediction control module is connected with the inverter assembly and the controlled end of the first switch, the prediction control module is also in communication connection with the inverter assembly, and the prediction control module is used for predicting the predicted power of the inverter assembly and acquiring the actual power of the inverter assembly;
the prediction control module is also used for outputting corresponding control signals to the inverter assembly and the first switch according to the predicted power and the actual power so as to control the inverter assembly to convert direct current output by the accessed photovoltaic assembly into alternating current and output the alternating current;
and/or the first switch is controlled to be conducted so as to control the inverter assembly to convert the direct current output by the photovoltaic assembly corresponding to the other inverter assembly into alternating current and then output the alternating current.
Optionally, the predictive control module includes:
the power prediction component is used for predicting and outputting the predicted power of the inverter component according to the acquired parameter information;
the control end of the main controller is connected with the inverter assembly and the controlled end of the first switch, the main controller is respectively in communication connection with the power prediction assembly and the inverter assembly, and the main controller is used for acquiring the predicted power and the real-time power of the inverter assembly and outputting corresponding control signals to the inverter assembly and the first switch according to the predicted power and the actual power so as to control the inverter assembly to convert the direct current output by the accessed photovoltaic assembly into alternating current and output the alternating current;
and/or the first switch is controlled to be conducted so as to control the inverter assembly to convert the direct current output by the photovoltaic assembly corresponding to the other inverter assembly into alternating current and then output the alternating current.
Optionally, the cooperative inverting circuit further comprises:
the first switch circuit is arranged between the inverter assembly and the alternating current output end in series, a controlled end of the first switch circuit is connected with the prediction control module, and the first switch circuit is used for controlling the inverter assembly to be electrically connected with the alternating current output end when the first switch circuit is conducted;
the second switching circuit is arranged between the other inverter assembly and the other alternating current output end in series, a controlled end of the second switching circuit is connected with the prediction control module, and the second switching circuit is used for controlling the other inverter assembly to be electrically connected with the other alternating current output end when the second switching circuit is conducted;
the prediction control module is further used for outputting a corresponding control signal to the first switch circuit according to the predicted power and the actual power so as to control the first switch circuit to be switched on/off;
and/or outputting a corresponding control signal to the second switch circuit to control the second switch circuit to be switched on/off.
Optionally, the cooperative inverting circuit further comprises:
and each single-winding transformer is connected with one alternating current output end, and is used for converting the alternating current output by the cooperative inverter circuit and outputting the converted alternating current.
Optionally, the cooperative inverting circuit further comprises:
and one winding of the double-winding transformer is connected with one alternating current output end, the other winding of the double-winding transformer is connected with the other alternating current output end, and the double-winding transformer is used for converting the voltage of the alternating current output by the cooperative inverter circuit and outputting the converted alternating current.
The present invention also provides a cooperative inverter circuit control method applied to the cooperative inverter circuit according to any one of claims 1 to 10, comprising:
acquiring the predicted power and the actual power of each inverter component;
according to the predicted power and the actual power of each inverter assembly, controlling the corresponding inverter assembly to convert the direct current output by the accessed photovoltaic assembly into alternating current and then outputting the alternating current; and/or the presence of a gas in the gas,
and controlling the first switch to be conducted so that the corresponding inverter assembly converts the direct current output by the photovoltaic assembly corresponding to the other inverter assembly into alternating current and outputs the alternating current.
Optionally, the corresponding inverter assembly is controlled to convert direct current output by the accessed photovoltaic assembly into alternating current and output the alternating current according to the predicted power and the actual power of each inverter assembly; and/or, controlling the first switch to be conducted so that the corresponding inverter assembly converts the direct current output by the photovoltaic assembly corresponding to the other inverter assembly into alternating current and outputs the alternating current, specifically:
when the predicted power is equal to a preset power, or the predicted power is greater than the preset power and the ratio of the predicted power to the actual power of each inverter assembly is greater than the preset ratio, controlling the first switch to be switched off, and controlling the inverter assemblies to convert direct current output by the photovoltaic assemblies which are respectively connected into the inverter assemblies into alternating current and then output the alternating current;
when the predicted power is larger than the preset power and the actual power of one inverter assembly is smaller than or equal to the preset power, controlling the inverter assembly to stop working, controlling the first switch to be conducted, and controlling the other inverter assembly to convert the direct current output by the photovoltaic assembly corresponding to the inverter assembly into alternating current and then output the alternating current;
when the predicted power is larger than the preset power and the ratio of the predicted power to the actual power of one inverter assembly is smaller than or equal to the preset ratio, controlling the first switch to be conducted, and controlling each inverter assembly to convert direct current output by the photovoltaic assembly connected with the inverter assembly and the photovoltaic assembly corresponding to the other inverter assembly into alternating current and output the alternating current;
and when the predicted power is greater than the preset power and the actual power of each inverter assembly is less than or equal to the preset power, controlling the first switch to be switched off and controlling the inverter assemblies to stop working.
Optionally, the step of obtaining the predicted power and the actual power of each inverter component specifically includes:
and acquiring the predicted power and the actual power of each inverter component once every preset time.
According to the technical scheme, the direct current input ends of the two inverter assemblies are interconnected through the second switch, so that the two inverter assemblies can work in a mutual cooperation mode, the cooperative inverter circuit can complete inversion work of the photovoltaic assembly through the other inverter assembly when one inverter assembly fails, and the power generation amount lost due to failure of the inverter assembly is reduced. Meanwhile, when the inverter assembly is short or the PV assembly PV is over-occurred, the direct current sides of the two inverter assemblies are communicated, so that direct current output by the PV assembly is converted into alternating current by the two inverter assemblies, cooperation between the two inverter assemblies is realized, inversion requirements of the PV assembly are met, the generated energy of a PV power station is increased, and the problem that the yield of the PV power station is easily influenced by the damage of the existing PV system due to the inverter is solved.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of 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 functional block diagram of an embodiment of a cooperative inverter circuit according to the present invention;
FIG. 2 is a functional block diagram of another embodiment of a cooperative inverter circuit according to the present invention;
FIG. 3 is a schematic circuit diagram of a cooperative inverter circuit according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of another embodiment of a cooperative inverter circuit according to the present invention;
FIG. 5 is a flowchart illustrating an exemplary embodiment of a cooperative inverter circuit control method according to the present invention;
fig. 6 is a flowchart illustrating another embodiment of a cooperative inverter circuit control method according to the present invention.
The reference numbers illustrate:
reference numerals Name (R) Reference numerals Name (R)
10 Inverter assembly PV Photovoltaic module
20 Voltage conversion circuit Q1～Qn First switch
30 First switch circuit K1～Kn The second switch
40 Second switch circuit QF1～QFn Circuit breaker
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
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 obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, 8230; etc.) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the figure), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a cooperative inverter circuit.
At present, in the design of the existing photovoltaic system, an inverter and a photovoltaic module are used in a single combination mode, when the inverter breaks down and the photovoltaic module in the inverter area is shielded, the photovoltaic power generation of the inverter can be greatly influenced, and the income of a photovoltaic power station is greatly influenced.
To solve the above problem, referring to fig. 1 to 4, in an embodiment, the cooperative inverter circuit includes:
an alternating current output end;
at least two inverter assemblies 10, wherein a dc input end of each inverter assembly 10 is used for connecting to a photovoltaic assembly PV, and an output end of each inverter assembly 10 is used for connecting to an ac output end;
a first switch, which is arranged in series between the dc input terminals of the two inverter assemblies 10; wherein,
each inverter assembly 10 is configured to convert a direct current output by a photovoltaic assembly PV connected thereto into an alternating current and output the alternating current;
and/or when the first switch is turned on, converting the direct current output by the photovoltaic module PV corresponding to the other inverter module 10 into alternating current and outputting the alternating current.
In the present embodiment, the cooperative inverter circuit is provided with at least two inverter assemblies 10, the dc input terminal of each inverter assembly 10 is connected to one photovoltaic assembly PV, and the dc input terminals of the two inverter assemblies 10 are connected to each other through the first switch, so that the inverter assemblies 10 can be connected to not only the photovoltaic assembly PV connected to itself but also another photovoltaic assembly PV through the first switch. With such an arrangement, when any one of the inverter assemblies 10 fails, the first switch can be controlled to be turned on, so that the photovoltaic assembly PV connected to the failed inverter assembly 10 can output the direct current to the other inverter assembly 10 through the first switch, and the direct current is converted into the alternating current by the other inverter assembly 10 and then output the alternating current.
Hereinafter, the two inverter assemblies 10 are referred to as a first inverter assembly 10 and a second inverter assembly 10, the photovoltaic assembly PV accessed by the first inverter assembly 10 is a first photovoltaic assembly PV, and the photovoltaic assembly PV accessed by the second inverter assembly 10 is a second photovoltaic assembly PV for example, when the first inverter assembly 10 fails, the first inverter assembly 10 may be controlled to stop working by an additionally arranged controller, and the first switch is controlled to be turned on, so that the second inverter assembly 10 is electrically connected with the first photovoltaic assembly PV, so as to convert the direct current output by the first photovoltaic assembly PV into alternating current, and similarly, when the second inverter assembly 10 fails, the first inverter assembly 10 is controlled to be electrically connected with the second photovoltaic assembly PV, so as to realize switching cooperation between the two inverter assemblies 10. Further, when the first inverter assembly 10 is absent, that is, the first inverter assembly 10 is abnormal but can operate, and its actual power is smaller than the theoretical power, so that the direct current output by the first photovoltaic assembly PV cannot be completely converted into alternating current by the first inverter assembly 10, the first switch may be controlled to be turned on, so that the first inverter assembly 10 and the second inverter assembly 10 together convert the direct current output by the first photovoltaic assembly PV into alternating current, and balance the power to the auxiliary inverter assembly 10, thereby increasing the power generation amount of the photovoltaic power station. Similarly, when the photovoltaic module PV accessed by the first inverter module 10 is in an over-current state, the power generation amount of the first photovoltaic module PV is larger, so that the first inverter module 10 cannot completely meet the inversion requirement of the first photovoltaic module PV, at this time, the first switch can be controlled to be turned on, so that the direct current output by the first photovoltaic module PV is converted into alternating current by the first inverter module 10 and the second inverter module 10 together, the power is balanced to the assisted inverter module 10, the inversion requirement of the photovoltaic module PV is met, and the power generation amount of the photovoltaic power station is increased. In addition, the first switch may be disposed in an inverter box of the inverter assembly 10, so as to save additional box devices and reduce the cost of the cooperative inverter circuit.
In the technical scheme of the invention, the direct current input ends of the two inverter assemblies 10 are interconnected through a first switch, so that the two inverter assemblies 10 can work in a mutual cooperation manner, a cooperation inverter circuit can complete the inversion work of the photovoltaic assembly PV through the other inverter assembly 10 when one inverter assembly 10 fails, and the power generation amount lost due to the failure of the inverter assembly 10 is reduced. Meanwhile, when the inverter assembly 10 is short of the power or the photovoltaic assembly PV is over-power, the direct current sides of the two inverter assemblies 10 are communicated, so that the direct current output by the photovoltaic assembly PV is converted into alternating current by the two inverter assemblies 10, the cooperative work between the two inverter assemblies 10 is realized, the inversion requirement of the photovoltaic assembly PV is met, and the power generation capacity of a photovoltaic power station is increased.
Referring to fig. 1 to 4, in an embodiment, each of the inverter assemblies 10 includes:
the direct current input end is used for being connected with a photovoltaic module PV, and is also connected with the direct current input end of another inverter module 10 through the first switch;
an inverter;
and a first end of the second switch is connected with the direct-current input end, a second end of the second switch is connected with the input end of the inverter, and the second switch is used for controlling the direct-current input end to be electrically connected with the inverter when the second switch is switched on, so that the inverter converts direct current output by the direct-current input end into alternating current and outputs the alternating current.
In the present embodiment, a second switch is further disposed in the inverter assembly 10, and is used for controlling the on/off of the path between the inverter and the dc input terminal. So set up, when the second switch switches on, the dc-to-ac converter communicates with direct current input, and at this moment, the photovoltaic module PV electricity that the dc-to-ac converter and direct current input accessed is connected. When the first switch and the second switch are both switched on, the inverter can be connected with a photovoltaic module PV connected to the other direct current input end through the second switch. Therefore, the inverter can be regarded as one inverter connected with two photovoltaic modules PV, and the two switches control the connection between the inverter and the two photovoltaic modules PV to be switched on or off, so that the inverter can convert direct current output by one photovoltaic module PV or two photovoltaic modules PV into alternating current. According to the photovoltaic power generation system, the direct current input ends of the two inverter assemblies 10 are connected, and the first switch and the second switch are arranged, so that a user can control the connection/disconnection of any one inverter assembly 10 and one or two photovoltaic assemblies PV by controlling the connection/disconnection of the first switch and the second switch, the cooperative work between the two inverter assemblies 10 is realized, the inversion requirement of the connected photovoltaic assemblies PV is met, and the power generation amount of a photovoltaic power station is increased.
Referring to fig. 1 to 4, in an embodiment, the cooperative inverter circuit has the following operation modes:
when the photovoltaic module operates in a normal mode, the first switch is turned off, and the second switches of the two inverter assemblies 10 are both turned on, so that the two inverter assemblies 10 convert direct current output by the respective connected photovoltaic assemblies PV into alternating current and output the alternating current;
when the photovoltaic inverter operates in the first cooperation mode, the first switch and the second switch in one of the inverter assemblies 10 are both turned on, and the second switch in the other of the inverter assemblies 10 is turned off, so that the one of the inverter assemblies 10 converts the direct current output by the connected photovoltaic assembly PV into alternating current and then outputs the alternating current, and converts the direct current output by the photovoltaic assembly PV corresponding to the other of the inverter assemblies 10 into alternating current and then outputs the alternating current;
when the photovoltaic inverter operates in the second cooperation mode, the first switch and the second switch of the two inverter assemblies 10 are both turned on, so that the two inverter assemblies 10 convert the direct current output by the respectively connected photovoltaic assembly PV into alternating current and then output the alternating current, and convert the direct current output by the photovoltaic assembly PV corresponding to the other inverter assembly 10 into alternating current and then output the alternating current;
when the inverter operates in the open circuit mode, the first switch and the second switch of the two inverter assemblies 10 are both turned off, so that the two inverter assemblies 10 stop operating.
Hereinafter, the two inverter assemblies 10 are referred to as a first inverter assembly 10 and a second inverter assembly 10, the photovoltaic assembly PV connected to the first inverter assembly 10 is a first photovoltaic assembly PV, and the photovoltaic assembly PV connected to the second inverter assembly 10 is a second photovoltaic assembly PV, which illustrate four connection modes of the cooperative inverter circuit in the embodiment.
When the first switch is turned off and the second switches in the first inverter assembly 10 and the second inverter assembly 10 are both turned on, that is, in a normal mode, the inverter in the first inverter assembly 10 is electrically connected to the first photovoltaic assembly PV, and the inverter in the second inverter assembly 10 is electrically connected to the second photovoltaic assembly PV, at this time, the first inverter assembly 10 and the second inverter assembly 10 are configured to convert the direct current output by the respective connected photovoltaic assembly PV into an alternating current and output the alternating current.
When the first switch and the second switch in the first inverter assembly 10 are turned on and the second switch in the second inverter assembly 10 is turned off, that is, in the first cooperation mode, the inverter in the first inverter assembly 10 is electrically connected to the first photovoltaic assembly PV, and meanwhile, the inverter in the first inverter assembly 10 is also electrically connected to the second photovoltaic assembly PV, and the inverter in the second inverter assembly 10 does not operate, at this time, the first inverter assembly 10 is configured to convert the direct current output by the first photovoltaic assembly PV and the second photovoltaic assembly PV into the alternating current and output the alternating current. Similarly, when the first switch and the second switch in the second inverter assembly 10 are turned on and the second switch in the first inverter assembly 10 is turned off, the inverter in the first inverter assembly 10 and the second inverter assembly 10 are configured to convert the direct current output by the first photovoltaic assembly PV and the second photovoltaic assembly PV into an alternating current and output the alternating current. It can be understood that the first cooperation mode can be used when any one inverter in the cooperation inverter circuit fails, so that the inverter cooperating therewith can complete the inversion operation of the photovoltaic module PV instead of the first cooperation mode, and the power generation amount lost due to the failure of the inverter module 10 is reduced.
When the first switch and the second switch in the first inverter module 10 and the second inverter module 10 are both turned on, that is, in the second cooperation mode, the inverter in the first inverter module 10 is electrically connected to the first photovoltaic module PV and the second photovoltaic module PV, the inverter in the second inverter module 10 is also electrically connected to the first photovoltaic module PV and the second photovoltaic module PV, and in the second cooperation mode, the first inverter module 10 and the second inverter module 10 jointly convert the direct current output by the first photovoltaic module PV and the second photovoltaic module PV into the alternating current and output the alternating current. The second cooperation mode may be used when the inverter assembly 10 is absent, that is, when the inverter assembly 10 is abnormal but can operate, for example, when the first inverter assembly 10 is absent, its actual power is smaller than the theoretical power, so that the direct current output by the first photovoltaic assembly PV cannot be completely converted into alternating current by the first inverter assembly 10, at this time, the cooperative inverter circuit is controlled to operate in the second cooperation mode, so that the first inverter assembly 10 and the second inverter assembly 10 jointly convert the direct current output by the first photovoltaic assembly PV into alternating current, and balance the power to the second inverter assembly 10, thereby meeting the inversion requirement of the first photovoltaic assembly PV. The second cooperation mode can also be used for the photovoltaic module PV when sending out excessively, that is to say, the generated energy of photovoltaic module PV is great to make inverter module 10 can not satisfy photovoltaic module PV's contravariant demand completely, control cooperation inverter circuit work in the second cooperation mode this moment, make first inverter module 10 and second inverter module 10 convert the direct current that photovoltaic module PV outputted into the alternating current jointly, thereby satisfy this photovoltaic module PV's contravariant demand, increase photovoltaic power plant's generated energy.
When the first switch and the second switch in the first inverter assembly 10 and the second inverter assembly 10 are both turned off, that is, in the open circuit mode, the first inverter assembly 10 and the second inverter assembly 10 do not work. The shutdown mode may be used when both inverter assemblies 10 fail, or when the inverter is not required to operate.
In the technical scheme of the invention, the first switch and the second switch are arranged, and the first switch and the second switch are controlled to be switched on or switched off, so that the cooperative inverter circuit is controlled to work in different communication modes, the two inverter assemblies 10 can work normally or in cooperation with each other, the cooperative inverter circuit can complete the inversion work of the photovoltaic assembly PV through the other inverter assembly 10 when one inverter assembly 10 fails, and the power generation amount lost due to the failure of the inverter assembly 10 is reduced. Meanwhile, when the inverter assembly 10 is short of the power or the photovoltaic assembly PV is over-power, the direct current sides of the two inverter assemblies 10 are communicated, so that the direct current output by the photovoltaic assembly PV is converted into alternating current by the two inverter assemblies 10, the cooperative work between the two inverter assemblies 10 is realized, the inversion requirement of the photovoltaic assembly PV is met, and the power generation capacity of a photovoltaic power station is increased.
Referring to fig. 1 to 4, in an embodiment, the cooperative inverting circuit further includes:
the input end of each voltage conversion circuit 20 is used for connecting to a photovoltaic module PV, the output end of each voltage conversion circuit 20 is connected with the direct current input end of one inverter module 10, and the voltage conversion circuit 20 is used for performing voltage conversion on the direct current output by the photovoltaic module PV and then outputting the direct current.
In this embodiment, the voltage conversion circuit 20 may be implemented by using a DC-DC voltage conversion circuit 20, and the voltage conversion circuit 20 may perform voltage conversion on the direct current output by the photovoltaic module PV and then output the direct current output by the photovoltaic module PV, so that the direct current output by the photovoltaic module PV can conform to the voltage input range of the direct current side of the inverter module 10, and then the inverter module 10 can stably convert the direct current power supply converted by the voltage conversion circuit 20 into alternating current and output the alternating current, thereby improving the safety of the cooperative inverter circuit and increasing the application range of the cooperative inverter circuit.
Referring to fig. 1 to 4, in an embodiment, the number of the inverter assemblies 10 is multiple, a plurality of the inverter assemblies 10 form two groups of inverter assembly 10 units with the same number, and a first switch is arranged in series between a dc input terminal of one inverter assembly 10 in the two groups of inverter assembly 10 units and a dc input terminal of one inverter assembly 10 in the other group of inverter assembly 10 units.
In the present embodiment, a first switch is disposed in series between the dc input terminals of one inverter assembly 10 of two sets of inverter assembly 10 units and one inverter assembly 10 of the other set of inverter assembly 10 units, in other words, it can also be understood that the plurality of inverter assemblies 10 in the cooperative inverter circuit are connected two by two, so that the plurality of inverter assemblies 10 can cooperate with each other two by two. Referring to fig. 3, fig. 3 is a schematic diagram of a circuit structure of an implementation of a cooperative inverter circuit, in which a plurality of cooperative inverter circuits are provided, and a plurality of inverter assemblies 10 are divided into two groups, an output terminal of each inverter assembly 10 in each group is connected to an ac output terminal, and an output terminal of each inverter assembly 10 in the other group is connected to another ac output terminal. With the arrangement, the plurality of inverter assemblies 10 are connected in pairs, so that each inverter assembly 10 is provided with the inverter assembly 10 cooperating with the inverter assembly 10, when any one inverter assembly 10 is in fault or abnormal, the inverter assembly 10 cooperating with the inverter assembly 10 can meet the inversion requirement of the photovoltaic assembly PV, the power generation amount lost due to the fault of the inverter assembly 10 is reduced, and the power generation amount of the photovoltaic power station is increased.
Referring to fig. 1 to 4, in an embodiment, the cooperative inverter circuit further includes:
the control end of the prediction control module is connected with the inverter assembly 10 and the controlled end of the first switch, the prediction control module is also in communication connection with the inverter assembly 10, and the prediction control module is used for predicting the predicted power of the inverter assembly 10 and collecting the actual power of the inverter assembly 10;
the prediction control module is further configured to output a corresponding control signal to the inverter assembly 10 and the first switch according to the predicted power and the actual power, so as to control the inverter assembly 10 to convert a direct current output by the accessed photovoltaic assembly PV into an alternating current and output the alternating current;
and/or, the first switch is controlled to be conducted so as to control the inverter assembly 10 to convert the direct current output by the photovoltaic assembly PV corresponding to another inverter assembly 10 into alternating current and output the alternating current.
In this embodiment, the prediction control module can predict the power of the inverter component 10, the prediction control module can select the irradiator and the upper computer to realize the prediction function, the irradiator can detect the real-time illumination intensity, the upper computer can obtain the illumination intensity detected by the irradiator and can obtain the local weather data through the server, so as to predict the theoretical power of the inverter component 10 according to the obtained illumination intensity and the weather data, that is, predict the power. The prediction control module can also select a controller to realize a power acquisition function and a control function of the cooperative inverter circuit, the controller can be in communication connection with the inverters in the inverter assemblies 10 to obtain real-time power of the inverters, and can judge working states of the inverters, such as whether the inverters are in failure, whether the inverters are in short-circuit and the like, according to the obtained predicted power and the obtained real-time power, so that corresponding control signals are output to control the cooperative inverter circuit to work in a corresponding communication mode, and cooperative work between the two inverter assemblies 10 is realized. For example, when the predicted power is greater than zero but the actual power is zero, it may be determined that the inverter assembly 10 fails, and at this time, the cooperative inverter circuit may be controlled to operate in the first cooperative mode, so that the other inverter assembly 10 completes the inversion operation of the two photovoltaic assemblies PV.
In the technical scheme of the invention, the prediction control module is arranged, so that the prediction control module can predict the predicted power of the inverter assembly 10 and collect the real-time power of the inverter assembly 10, the state of the inverter assembly 10 is judged according to the obtained predicted power and the real-time power, and the cooperative inverter circuit is controlled to work in a corresponding communication mode according to the state of the inverter assembly 10, so that the cooperative work among the inverter assemblies 10 is realized, the inversion requirement of the photovoltaic assembly PV is met, the power generation amount lost due to the failure of the inverter assembly 10 is reduced, and the power generation amount of a photovoltaic power station is increased.
Referring to fig. 1 to 4, in one embodiment, the prediction control module includes:
a power prediction component for predicting and outputting the predicted power of the inverter component 10 according to the acquired parameter information;
the control end of the main controller is connected with the inverter assembly 10 and the controlled end of the first switch, the main controller is respectively in communication connection with the power prediction assembly and the inverter assembly 10, and the main controller is used for acquiring the predicted power and the real-time power of the inverter assembly 10 and outputting corresponding control signals to the inverter assembly 10 and the first switch according to the predicted power and the actual power so as to control the inverter assembly 10 to convert the direct current output by the accessed photovoltaic assembly PV into alternating current and then output the alternating current;
and/or, the first switch is controlled to be turned on to control the inverter assembly 10 to convert the direct current output by the photovoltaic assembly PV corresponding to the other inverter assembly 10 into alternating current and output the alternating current.
In this embodiment, the power prediction module may select an irradiation meter and an upper computer to implement a prediction function, the irradiation meter may detect real-time illumination intensity, and the upper computer may obtain the illumination intensity detected by the irradiation meter and local weather data through the server, so as to predict theoretical power of the inverter module 10, that is, predicted power, according to the obtained illumination intensity and weather data. The main controller can be a single chip microcomputer, an FPGA (field programmable gate array), a CPLD (complex programmable logic device) and other processors to realize a power acquisition function and a control function of the cooperative inverter circuit, can be in communication connection with the inverter in the inverter assembly 10 to acquire real-time power of the inverter, and can judge the working state of the inverter according to the acquired predicted power and the real-time power, such as whether the inverter fails or not, whether the inverter is absent or not and the like, so that a corresponding control signal is output according to the acquired predicted power and the acquired real-time power to control the cooperative inverter circuit to work in a corresponding communication mode, and the cooperative work between the two inverter assemblies 10 is realized.
Referring to fig. 1 to 4, in an embodiment, the cooperative inverter circuit further includes:
the first switch circuit 30, the first switch circuit 30 is serially connected between the inverter component 10 and the ac output terminal, the controlled terminal of the first switch circuit 30 is connected to the predictive control module, and the first switch circuit 30 is configured to control the inverter component 10 to be electrically connected to the ac output terminal when the first switch circuit is turned on;
a second switch circuit 40, wherein the second switch circuit 40 is serially arranged between another inverter assembly 10 and another ac output terminal, a controlled terminal of the second switch circuit 40 is connected to the predictive control module, and the second switch circuit 40 is configured to control the another inverter assembly 10 to be electrically connected to the another ac output terminal when being turned on;
the prediction control module is further configured to output a corresponding control signal to the first switch circuit 30 according to the predicted power and the actual power, so as to control the first switch circuit 30 to be turned on/off;
and/or, outputting a corresponding control signal to the second switch circuit 40 to control the second switch circuit 40 to be turned on/off.
Referring to fig. 2 and 3, a first switch circuit 30 and a second switch circuit 40 are further disposed between the inverter assembly 10 and the ac output terminal in fig. 2, and the first switch circuit 30 and the second switch circuit 40 may be implemented by circuit breakers shown in fig. 3, where the types of the circuit breakers QF1 to QFn and the circuit breakers QFL1 and QFL2 may be the same or different, so as to implement general control and branch control. The prediction control module can determine whether the inverter assembly 10 works normally according to the obtained predicted power and actual power, and can disconnect the electric connection between the inverter assembly 10 and the alternating current output end when determining that the inverter assembly 10 is in fault or abnormal, so that the inverter assembly 10 cannot output alternating current to the alternating current output end, the protection of the inverter assembly 10 and equipment accessed by the alternating current output end is realized, and the safety of a cooperative inverter circuit is improved.
Referring to fig. 1 to 4, in an embodiment, the cooperative inverter circuit further includes:
and each single-winding transformer is connected with one alternating current output end and is used for converting the voltage of the alternating current output by the cooperative inverter circuit and outputting the converted alternating current.
Referring to fig. 3, fig. 3 is a schematic circuit structure diagram of an implementation of a cooperative inverter circuit, in the diagram, two ac output terminals are respectively connected to a single-winding transformer, and the single-winding transformer is used for performing voltage conversion on ac output from the ac output terminals and outputting the ac.
Optionally, the cooperative inverting circuit further comprises:
and one winding of the double-winding transformer is connected with one alternating current output end, the other winding of the double-winding transformer is connected with the other alternating current output end, and the double-winding transformer is used for converting the voltage of the alternating current output by the cooperative inverter circuit and outputting the converted alternating current.
Referring to fig. 4, fig. 4 is a schematic circuit structure diagram of another implementation of the cooperative inverter circuit, in the diagram, two ac output terminals are respectively connected to windings of a double-winding transformer, and the double-winding transformer is used for converting voltages of ac power output by the ac output terminals and outputting the converted ac power. In the above two embodiments, two cooperating inverter assemblies 10 are each connected to an ac output, and the two cooperating inverter assemblies 10 respectively output ac power to different transformers or ac power to different windings. By the arrangement, the two inverter assemblies 10 which are mutually cooperated are connected with different output ends, the problem of circulation current of the two inverter assemblies 10 which are mutually cooperated can be avoided, and the safety of the cooperative inverter circuit is improved.
The present invention further provides a cooperative inverter circuit control method, which is applied to the cooperative inverter circuit described above, and referring to fig. 5, in an embodiment, the cooperative inverter circuit control method includes:
step S100, obtaining a predicted power and an actual power of each inverter component 10;
in this embodiment, the predicted power of the inverter assembly 10 may be obtained by setting an irradiator and an upper computer, the irradiator may detect the real-time illumination intensity, and the upper computer may obtain the illumination intensity detected by the irradiator and may obtain the local weather data through the server, so that the theoretical power of the inverter assembly 10, that is, the predicted power, may be predicted according to the illumination intensity and the weather data. Meanwhile, the inverter in the inverter assembly 10 can be in communication connection with an upper computer or a controller, so that the real-time power of the inverter can be obtained.
Step S200, controlling the corresponding inverter assembly 10 to convert the direct current output by the accessed photovoltaic assembly PV into alternating current and output the alternating current according to the predicted power and the actual power of each inverter assembly 10; and/or the presence of a gas in the gas,
and controlling the first switch to be conducted so that the corresponding inverter assembly 10 converts the direct current output by the photovoltaic assembly PV corresponding to the other inverter assembly 10 into alternating current and outputs the alternating current.
In the embodiment, the working state of each inverter assembly 10 in the cooperative inverter circuit, for example, whether the inverter assembly 10 is faulty, whether the inverter assembly 10 is absent, and the like, can be determined according to the predicted power and the actual power, so that the cooperative inverter circuit is controlled to work in a corresponding communication mode according to the working state of the inverter assembly 10, for example, when one inverter assembly 10 is faulty and cannot be inverted, the inverter assembly 10 cooperating with the inverter assembly 10 can be controlled to replace the inverter assembly to complete the inversion work, and therefore, when any one inverter assembly 10 is faulty or abnormal, the inversion requirement of the photovoltaic assembly PV can be met through the cooperating inverter assembly 10, the power generation amount lost due to the fault of the inverter assembly 10 is reduced, and the power generation amount of the photovoltaic power station is increased.
Optionally, the corresponding inverter assembly 10 is controlled to convert the direct current output by the accessed photovoltaic assembly PV into alternating current and output the alternating current according to the predicted power and the actual power of each inverter assembly 10; and/or, the step of controlling the first switch to be turned on so that the corresponding inverter assembly 10 converts the direct current output by the photovoltaic assembly PV corresponding to the other inverter assembly 10 into alternating current and outputs the alternating current is specifically:
when the predicted power is equal to a preset power, or the predicted power is greater than the preset power and the ratio of the predicted power to the actual power of each inverter assembly 10 is greater than the preset ratio, controlling the first switch to be turned off, and controlling the inverter assemblies 10 to convert direct current output by the photovoltaic assemblies PV which are respectively connected into the inverter assemblies into alternating current and then output the alternating current;
when the predicted power is greater than the preset power and the actual power of one inverter assembly 10 is less than or equal to the preset power, controlling the inverter assembly 10 to stop working, controlling the first switch to be conducted, and controlling the other inverter assembly 10 to convert the direct current output by the photovoltaic assembly PV corresponding to the inverter assembly 10 into alternating current and output the alternating current;
when the predicted power is greater than the preset power and the ratio of the predicted power to the actual power of one inverter assembly 10 is less than or equal to the preset ratio, controlling the first switch to be conducted, and controlling each inverter assembly 10 to convert the direct current output by the photovoltaic assembly PV connected to the inverter assembly 10 and the direct current output by the photovoltaic assembly PV corresponding to the other inverter assembly 10 into alternating current and output the alternating current;
and when the predicted power is greater than the preset power and the actual power of each inverter assembly 10 is less than or equal to the preset power, controlling the first switch to be turned off and controlling the inverter assemblies 10 to stop working.
Referring to fig. 2 to 4, the overall control flow of the cooperative inverter circuit is as follows, when the system is started, the first switch circuit 30 and the second switch circuit 40 are controlled to be closed, that is, the circuit breakers QF1 to QFn are controlled to be closed, and the second switches K1 to Kn in the inverter assembly 10 are controlled to be closed, so that the system starts to work normally. After the system works normally, the power prediction component predicts the predicted power of the inverters and sends the predicted power to the controller, and the controller acquires the real-time power of each inverter and performs comparative analysis on the predicted power and the real-time power.
The preset power and the preset ratio can be set according to actual conditions, and the following description will be given by setting the preset power to 0 and the preset ratio to 90%. When the predicted power is 0, that is, the photovoltaic modules PV do not generate power at this time, the controller does not issue a command, or controls the cooperative inverter circuit to operate in a normal mode, that is, controls the first switch in the cooperative inverter circuit to be turned off, and controls the inverter modules 10 to convert the direct current output by the respective accessed photovoltaic modules PV into alternating current and output the alternating current.
When the predicted power is larger than 0, namely the photovoltaic module PV is in a normal power generation state in daytime, if the actual power of the inverter is 0 at the moment, the inverter is judged to be in fault, the cooperative inverter circuit is controlled to work in a first cooperative mode, namely the second switch of the fault inverter is controlled to be switched off, and the corresponding first switch is switched on, so that the direct current side of the fault inverter is all switched to the cooperative inverter to run and generate power. .
When the predicted power is larger than 0, namely the photovoltaic module PV is in a normal power generation state in daytime, if the ratio of the actual power of the inverter to the predicted power is smaller than 90%, the inverter is judged to have power generation loss, the cooperative inverter circuit is controlled to work in a second cooperative mode, namely the second switch and the first switch of the corresponding inverter are controlled to be closed, the direct current side of the limited inverter is switched to the cooperative inverter to operate and generate power, and therefore the two cooperative inverters operate and generate power at the same time.
When the predicted power is greater than 0, that is, the photovoltaic modules PV are in a normal power generation state in the daytime, if the ratio of the actual power of the inverter to the predicted power is greater than 90%, it is determined that the inverter has no power generation loss, the controller does not send a command to the lower side, or controls the cooperative inverter circuit to operate in a normal mode, that is, controls the first switch in the cooperative inverter circuit to be turned off, and controls the inverter modules 10 to convert the direct current output by the respective accessed photovoltaic modules PV into alternating current for output.
In the technical scheme of the invention, direct current input ends of two inverter assemblies 10 are interconnected through a second switch, so that the two inverter assemblies 10 can work in a mutual cooperation mode, and the cooperative inverter circuit is controlled to work in a corresponding communication mode according to the predicted power and the real-time power of the inverter by predicting the predicted power of the inverter and collecting the real-time power of the inverter, so that the cooperative inverter circuit can complete the inversion work of a photovoltaic assembly PV through the other inverter assembly 10 when one inverter assembly 10 fails, and the power generation amount lost due to the failure of the inverter assembly 10 is reduced. Meanwhile, when the generated energy is lost, the direct current sides of the two inverter assemblies 10 are communicated, so that the two inverter assemblies 10 convert direct current output by the photovoltaic assembly PV into alternating current, the intelligent degree of a cooperative inverter circuit is improved, cooperative work between the two inverter assemblies 10 is realized, the inversion requirement of the photovoltaic assembly PV is met, and the generated energy of a photovoltaic power station is increased.
Referring to fig. 6, in an embodiment, the step of obtaining the predicted power and the actual power of each inverter assembly 10 specifically includes:
step S110, obtaining the predicted power and the actual power of each inverter component 10 once every preset time interval.
In this embodiment, the prediction control module obtains the predicted power and the actual power of the inverter assembly 10 once every certain time interval, and the preset time can be set according to the actual application scenario, so that the power of the inverter does not need to be monitored in real time, and the working state of the inverter can be determined only by setting a reasonable time interval. For example, when the change of the illumination intensity is not large according to the weather data, the time interval of prediction and collection can be increased, so that the energy consumed by prediction and collection is saved, the possibility of misjudgment of the prediction control module is reduced, and the energy utilization rate and the safety of the cooperative inverter circuit are improved.
The present invention further provides a cooperative inverter circuit, which includes the above cooperative inverter circuit, and the specific structure of the cooperative inverter circuit refers to the above embodiments, and since the cooperative inverter circuit adopts all technical solutions of all the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and details are not repeated here.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (13)

1. A cooperative inverting circuit, comprising:
an alternating current output end;
the direct current input end of each inverter assembly is used for being connected with a photovoltaic assembly, and the output end of each inverter assembly is used for being connected with an alternating current output end;
the first switch is arranged between the direct current input ends of the two inverter assemblies in series; wherein,
each inverter assembly is used for converting direct current output by the photovoltaic assembly which is connected with the inverter assembly into alternating current and outputting the alternating current;
and/or when the first switch is conducted, the direct current output by the photovoltaic module corresponding to the other inverter module is converted into alternating current and then output.
2. The cooperative inverter circuit as recited in claim 1, wherein each of said inverter assemblies comprises:
the direct current input end is used for being connected with a photovoltaic component and is also connected with the direct current input end of another inverter component through the first switch;
an inverter;
and a first end of the second switch is connected with the direct-current input end, a second end of the second switch is connected with the input end of the inverter, and the second switch is used for controlling the direct-current input end to be electrically connected with the inverter when the second switch is switched on, so that the inverter converts direct current output by the direct-current input end into alternating current and outputs the alternating current.
3. The cooperative inverter circuit as recited in claim 2, wherein the cooperative inverter circuit has the following modes of operation:
when the photovoltaic module works in a normal mode, the first switch is turned off, and the second switches of the two inverter assemblies are turned on, so that the two inverter assemblies convert direct current output by the photovoltaic assemblies connected to the two inverter assemblies into alternating current and then output the alternating current;
when the photovoltaic power generation system works in a first cooperation mode, the first switch and the second switch in one inverter assembly are both switched on, and the second switch in the other inverter assembly is switched off, so that the inverter assembly converts direct current output by the connected photovoltaic assembly into alternating current and then outputs the alternating current, and converts direct current output by the photovoltaic assembly corresponding to the other inverter assembly into alternating current and then outputs the alternating current;
when the photovoltaic inverter works in a second cooperation mode, the first switch and a second switch in the two inverter assemblies are both conducted, so that the two inverter assemblies convert direct current output by the photovoltaic assembly connected to the two inverter assemblies into alternating current and then output the alternating current, and convert direct current output by the photovoltaic assembly corresponding to the other inverter assembly into alternating current and then output the alternating current;
when the inverter is operated in the circuit breaking mode, the first switch and the second switch in the two inverter assemblies are both turned off, so that the two inverter assemblies stop operating.
4. The cooperative inverter circuit as recited in claim 1, further comprising:
the input end of each voltage conversion circuit is used for being connected with a photovoltaic module, the output end of each voltage conversion circuit is connected with the direct current input end of the inverter module, and the voltage conversion circuits are used for performing voltage conversion on direct current output by the photovoltaic modules and then outputting the direct current.
5. The cooperative inverter circuit according to claim 1, wherein the number of the inverter modules is plural, a plurality of the inverter modules constitute two groups of inverter module units having the same number, and a first switch is provided in series between a dc input terminal of one of the inverter modules in the two groups of the inverter module units and a dc input terminal of one of the inverter modules in the other group of the inverter module units.
6. The cooperative inversion circuit of claim 1, further comprising:
the control end of the prediction control module is connected with the inverter assembly and the controlled end of the first switch, the prediction control module is also in communication connection with the inverter assembly, and the prediction control module is used for predicting the predicted power of the inverter assembly and acquiring the actual power of the inverter assembly;
the prediction control module is also used for outputting corresponding control signals to the inverter assembly and the first switch according to the predicted power and the actual power so as to control the inverter assembly to convert direct current output by the accessed photovoltaic assembly into alternating current and output the alternating current;
and/or controlling the first switch to be conducted so as to control the inverter assembly to convert the direct current output by the photovoltaic assembly corresponding to the other inverter assembly into alternating current and then output the alternating current.
7. The cooperative inverter circuit of claim 6, wherein the predictive control module comprises:
the power prediction component is used for predicting and outputting the predicted power of the inverter component according to the acquired parameter information;
the control end of the main controller is connected with the inverter assembly and the controlled end of the first switch, the main controller is respectively in communication connection with the power prediction assembly and the inverter assembly, and the main controller is used for acquiring the predicted power and the real-time power of the inverter assembly and outputting corresponding control signals to the inverter assembly and the first switch according to the predicted power and the actual power so as to control the inverter assembly to convert direct current output by the accessed photovoltaic assembly into alternating current and then output the alternating current;
and/or controlling the first switch to be conducted so as to control the inverter assembly to convert the direct current output by the photovoltaic assembly corresponding to the other inverter assembly into alternating current and then output the alternating current.
8. The cooperative inverter circuit as recited in claim 6, further comprising:
the first switch circuit is arranged between the inverter assembly and the alternating current output end in series, a controlled end of the first switch circuit is connected with the prediction control module, and the first switch circuit is used for controlling the inverter assembly to be electrically connected with the alternating current output end when the first switch circuit is conducted;
the second switching circuit is arranged between the other inverter assembly and the other alternating current output end in series, a controlled end of the second switching circuit is connected with the prediction control module, and the second switching circuit is used for controlling the other inverter assembly to be electrically connected with the other alternating current output end when the second switching circuit is conducted;
the prediction control module is further used for outputting a corresponding control signal to the first switch circuit according to the predicted power and the actual power so as to control the first switch circuit to be switched on/off;
and/or outputting a corresponding control signal to the second switch circuit to control the second switch circuit to be switched on/off.
9. The cooperative inverting circuit of any of claims 1-8, further comprising:
and each single-winding transformer is connected with one alternating current output end, and is used for converting the alternating current output by the cooperative inverter circuit and outputting the converted alternating current.
10. The cooperative inverting circuit as recited in any of claims 1-8 further comprising:
and one winding of the double-winding transformer is connected with one alternating current output end, the other winding of the double-winding transformer is connected with the other alternating current output end, and the double-winding transformer is used for converting the voltage of the alternating current output by the cooperative inverter circuit and outputting the converted alternating current.
11. A cooperative inverter circuit control method applied to the cooperative inverter circuit according to any one of claims 1 to 10, comprising:
acquiring the predicted power and the actual power of each inverter component;
according to the predicted power and the actual power of each inverter assembly, controlling the corresponding inverter assembly to convert the direct current output by the accessed photovoltaic assembly into alternating current and then outputting the alternating current; and/or the presence of a gas in the gas,
and controlling the first switch to be conducted so that the corresponding inverter assembly converts the direct current output by the photovoltaic assembly corresponding to the other inverter assembly into alternating current and outputs the alternating current.
12. The method according to claim 11, wherein the inverter components are controlled to convert the dc power outputted from the connected pv components into ac power and output the ac power according to the predicted power and the actual power of each inverter component; and/or, the step of controlling the first switch to be turned on so that the corresponding inverter assembly converts the direct current output by the photovoltaic assembly corresponding to the other inverter assembly into alternating current and outputs the alternating current is specifically as follows:
when the predicted power is equal to a preset power, or the predicted power is greater than the preset power and the ratio of the predicted power to the actual power of each inverter assembly is greater than the preset ratio, controlling the first switch to be switched off, and controlling the inverter assemblies to convert direct current output by the photovoltaic assemblies which are respectively connected into the inverter assemblies into alternating current and then output the alternating current;
when the predicted power is larger than the preset power and the actual power of one inverter assembly is smaller than or equal to the preset power, controlling the inverter assembly to stop working, controlling the first switch to be conducted, and controlling the other inverter assembly to convert the direct current output by the photovoltaic assembly corresponding to the inverter assembly into alternating current and then output the alternating current;
when the predicted power is larger than the preset power and the ratio of the predicted power to the actual power of one inverter assembly is smaller than or equal to the preset ratio, controlling the first switch to be conducted, and controlling each inverter assembly to convert direct current output by the photovoltaic assembly connected with the inverter assembly and the photovoltaic assembly corresponding to the other inverter assembly into alternating current and output the alternating current;
and when the predicted power is greater than the preset power and the actual power of each inverter assembly is less than or equal to the preset power, controlling the first switch to be switched off and controlling the inverter assemblies to stop working.
13. The method of claim 11, wherein the step of obtaining the predicted power and the actual power of each inverter component comprises:
and acquiring the predicted power and the actual power of each inverter component once every preset time.
CN202211119755.4A 2022-09-14 2022-09-14 Cooperative inverter circuit and control method thereof Pending CN115333391A (en)

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CN202211119755.4A CN115333391A (en) 2022-09-14 2022-09-14 Cooperative inverter circuit and control method thereof

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