CN115395554A - Solar energy and commercial power complementary power generation system and control method - Google Patents
Solar energy and commercial power complementary power generation system and control method Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 485
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- 238000004146 energy storage Methods 0.000 claims abstract description 293
- 238000002955 isolation Methods 0.000 claims abstract description 130
- 238000006243 chemical reaction Methods 0.000 claims abstract description 91
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 53
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- 230000000087 stabilizing effect Effects 0.000 claims description 20
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- 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
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Abstract
The invention discloses a solar energy and commercial power complementary power generation system, which comprises: the light intensity detection concentration energy storage module is used for carrying out concentrated power generation and energy storage and dispersed power generation and energy storage by detecting the solar illumination intensity of solar power generation in different areas; the mains supply photoelectric bidirectional isolation module is used for respectively isolating photovoltaic power generation and mains supply and carrying out centralized power generation energy storage and decentralized power generation energy storage to prevent impact transformation; the main control adjustment complementary protection module is used for performing protection control on independent power supply adjustment and power supply complementary state adjustment through main control adjustment control; the photovoltaic power generation commercial power complementation module is used for carrying out various power supply complementation power generation on commercial power conversion direct current power supply, centralized power generation energy storage, decentralized power generation energy storage and solar power generation power supply; a solar energy and commercial power complementary power generation control method; the solar energy utilization efficiency and the safety and stability complementary with the commercial power can be improved.
Description
Technical Field
The invention relates to the field of new energy complementary power generation, in particular to a solar energy and commercial power complementary power generation system and a control method.
Background
At present, new energy and commercial power need to solve the problems of centralized power generation and energy storage and decentralized power generation and energy storage; the problems of how to isolate anti-impact transformation, independent power supply regulation and power supply complementary state regulation for protection control, and various power supply complementary power generation for commercial power conversion direct current power supply, centralized power generation and energy storage, distributed power generation and energy storage, solar power generation and power supply and the like exist; therefore, there is a need for a solar energy and commercial power complementary power generation system and a control method thereof to at least partially solve the problems in the prior art.
Disclosure of Invention
In the summary section, a series of concepts in a simplified form are introduced, which will be described in further detail in the detailed description section; the summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
In order to solve the above problem at least partially, the present invention provides a solar energy and commercial power complementary power generation system, which is characterized by comprising:
the light intensity detection concentration and energy storage module is used for carrying out concentrated power generation and energy storage and dispersed power generation and energy storage by detecting the solar illumination intensity of solar power generation in different areas;
the mains supply photoelectric bidirectional isolation module is used for respectively isolating photovoltaic power generation from mains supply and carrying out isolation and impact conversion on concentrated power generation energy storage and dispersed power generation energy storage;
the main control adjustment complementary protection module is used for performing protection control on independent power supply adjustment and power supply complementary state adjustment through main control adjustment control;
the photovoltaic power generation commercial power complementary module is used for carrying out various power supply complementary power generation on commercial power conversion direct current power supply, centralized power generation energy storage, decentralized power generation energy storage and solar power generation power supply.
Preferably, the light intensity detection set-division energy storage module includes:
the solar light intensity detection submodule is used for detecting the solar light intensity of solar power generation in different areas through the solar light intensity detection unit;
the concentrated power generation and energy storage submodule is used for carrying out concentrated power generation and energy storage of solar power generation in a region with concentrated solar illumination intensity;
and the dispersed power generation and energy storage submodule is used for performing dispersed power generation and energy storage of solar power generation in the solar illumination intensity dispersed area.
Preferably, the mains supply photoelectric bidirectional isolation module comprises:
the reverse impact isolation submodule of the utility grid is used for isolating the utility grid from the utility grid through power frequency transformation isolation of the power grid;
the photovoltaic power generation anti-impact isolation submodule is used for carrying out photovoltaic power generation anti-impact isolation by utilizing the optical semiconductor isolation device;
and the double-end switching fluctuation isolation submodule is used for converting the direct current generated by the solar power into the direct current of the low-voltage terminal required by the low-voltage terminal through isolation by the isolation conversion device.
Preferably, the master control adjustment complementary protection module includes:
the main control system adjusting submodule is used for adjusting the solar power generation and the commercial power supply to independently supply power through the main control system;
the main control complementary adjusting submodule is used for adjusting the complementary power supply state of the solar power generation and the commercial power supply through main control complementary adjustment;
and the main control protection control submodule is used for carrying out protection control on independent power supply regulation and power supply complementary state regulation.
Preferably, the photovoltaic power generation commercial power complementary module comprises:
the commercial power low-voltage rectifier module is used for rectifying commercial power supply through a rectifier device and converting alternating commercial power into system direct current power supply;
the photovoltaic power generation stabilizing submodule is used for stabilizing the power generation of the solar power generation through the photovoltaic power generation stabilizing device;
and the energy storage and power supply complementary submodule is used for carrying out various power supply complementary power generation on the concentrated power generation energy storage, the dispersed power generation energy storage, the solar power generation power supply and the mains supply power supply.
The invention discloses a solar energy and commercial power complementary power generation control method, which is characterized by comprising the following steps:
s100, concentrated power generation and energy storage and dispersed power generation and energy storage are carried out by detecting the solar illumination intensity of solar power generation in different areas;
s200, respectively isolating photovoltaic power generation and commercial power as well as concentrated power generation energy storage and dispersed power generation energy storage to prevent impact transformation;
s300, performing protection control on independent power supply regulation and power supply complementary state regulation through master control regulation control;
and S400, performing various power supply complementary power generation on the commercial power conversion direct current power supply, the centralized power generation energy storage, the distributed power generation energy storage and the solar power generation power supply.
Preferably, the S100 includes:
s101, detecting the solar illumination intensity of solar power generation in different areas through a solar intensity detection unit;
s102, performing concentrated power generation and energy storage of solar power generation in a solar illumination intensity concentrated area;
and S103, performing distributed power generation and energy storage of solar power generation in the solar illumination intensity distributed area.
Preferably, the S200 includes:
s201, isolating the power grid power frequency transformation isolation from the commercial power;
s202, photovoltaic power generation anti-impact isolation is carried out by utilizing a photo-semiconductor isolation device;
and S203, converting the direct current generated by the solar energy into the direct current of the low-voltage terminal required by the low-voltage terminal through isolation by using an isolation conversion device.
Preferably, the S300 includes:
s301, adjusting solar power generation and independent power supply adjustment of mains supply through a master control system;
s302, performing power supply complementary state adjustment on solar power generation and mains supply complementation through master control complementary adjustment; performing supply complement state adjustment includes: s3021, commercial power energy is output to supply power for charging, the solar power generation output is zero, and the energy storage of the storage battery pack is zero; s3022, the commercial power energy is output to supply power for charging, the solar power generation output is zero, and the storage battery has energy storage; s3023, supplying power and charging by using commercial power energy output, outputting energy by using solar power generation, storing the energy by using a storage battery pack, and performing main control complementary regulation in the state for offline independent operation; s3024, the mains supply has energy output, the solar power generation has energy output, the storage battery has energy storage, and the main control complementary regulation is used for online independent operation in the state; the storage battery pack is connected with mains supply charging and solar charging, and temporary energy is obtained from the outside of the main control complementary regulation and supplied to the storage battery pack when the mains supply charging and the solar charging are used in the state S3021; in the state S3022, the storage battery pack discharges, the direct current low-voltage bus is connected to the direct current boost conversion unit II through the DC/DC direct current boost conversion unit II, and the direct current low-voltage bus provides energy input for the electric load through the voltage conversion unit III to the output end; the control unit is used for monitoring whether the first voltage conversion unit, the second voltage conversion unit and the fourth voltage conversion unit have energy input or not, and then the state is switched to a state S3023 or a state S3024 according to the input.
And S303, carrying out protection control on the independent power supply regulation and the power supply complementary state regulation.
Preferably, the S400 includes:
s401, rectifying mains supply through a rectifying device, and converting alternating current mains supply into system direct current supply;
s402, generating power stably for solar power generation through a photoelectric power generation stabilizing device;
s403, performing multiple power supply complementary power generation on the concentrated power generation energy storage, the dispersed power generation energy storage, the solar power generation power supply and the mains supply; the multiple power supply complementary power generation comprises: the conversion and transmission with centralized power generation and energy storage, distributed power generation and energy storage, solar power generation and power supply and commercial power supply are realized through the main control, the regulation and conversion unit, the detection unit and the transmission unit of the complementary protection module; the main control complementary regulation submodule consists of a second DSP, a regulation conversion unit, a detection unit, a power panel and a transmission unit and realizes the control of the bidirectional converter unit and the three-phase power grid energy flow direction management unit;
the modularized combination interface for centralized power generation and energy storage and decentralized power generation and energy storage is connected with the centralized power generation and energy storage and the decentralized power generation and energy storage; the modularized combined interface for centralized power generation and energy storage and decentralized power generation and energy storage is a plug-and-play interface, and has high insulation property and high protection level; the energy storage charging and discharging management unit releases energy from the centralized power generation energy storage and the distributed power generation energy storage to the low-frequency isolation conversion unit according to an instruction issued by the control unit, or charges the energy from the low-frequency isolation conversion unit to the centralized power generation energy storage and the distributed power generation energy storage according to an instruction issued by the control unit, and has the functions of voltage boosting and voltage reducing, and current constant-current charging and discharging; the low-frequency isolation conversion unit comprises a low-voltage direct-current bus unit, a low-frequency bidirectional isolation unit and a high-voltage direct-current bus unit; the low-voltage direct-current bus unit comprises a low-voltage direct-current bus, a direct-current supporting capacitor and an AD converter, and the energy of the photovoltaic array or the centralized power generation and energy storage and the dispersed power generation and energy storage is controlled to be transmitted to the low-frequency bidirectional isolation unit; the low-frequency bidirectional isolation unit comprises a booster circuit, a low-frequency boost-buck inductor, a reactor, a buck circuit, a low-frequency rectification circuit, a low-frequency isolation transformer and an AD converter, and the energy from the low-voltage direct-current bus is transferred to the high-voltage direct-current bus; the high-voltage direct-current bus unit comprises a high-voltage direct-current bus, a direct-current support capacitor and an AD converter, and the purpose that energy from the low-frequency bidirectional isolation unit is transmitted to the bidirectional converter unit or the energy from the bidirectional converter unit is transmitted to the energy storage management unit is achieved.
Compared with the prior art, the invention at least comprises the following beneficial effects:
the invention relates to a solar energy and mains supply complementary power generation system, which is characterized in that a light intensity detection and energy collection and collection module and a mains supply photoelectric bidirectional isolation module are respectively connected with a main control regulation complementary protection module, and the mains supply photoelectric bidirectional isolation module and the main control regulation complementary protection module are simultaneously connected with a photoelectric power generation and mains supply complementary module; the light intensity detection concentration energy storage module performs concentrated power generation and energy storage and dispersed power generation and energy storage by detecting the solar illumination intensity of solar power generation in different areas; the mains supply photoelectric bidirectional isolation module is used for respectively isolating photovoltaic power generation and mains supply and carrying out isolation and impact conversion on concentrated power generation energy storage and dispersed power generation energy storage; the main control adjustment complementary protection module performs protection control on independent power supply adjustment and power supply complementary state adjustment through main control adjustment control; the photoelectric power generation commercial power complementation module carries out various power supply complementation power generation on commercial power conversion direct current power supply, centralized power generation and energy storage, decentralized power generation and energy storage and solar power generation and power supply; the centralized power generation and energy storage and the distributed power generation and energy storage can ensure that the distribution of the power generation and energy storage is more reasonable and the efficiency of the power generation and energy storage is further improved; the isolation and impact prevention can ensure that the complementary power generation is safer and more reliable; the independent power supply and the complementary state protection control can make the switching of complementary power generation more stable; the solar energy utilization efficiency and the safety and stability complementary with the commercial power are improved.
Other advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a block diagram of a solar energy and commercial power complementary power generation system according to the present invention.
Fig. 2 is a circuit diagram of a main control regulation complementary protection module of a solar energy and commercial power complementary power generation system according to the present invention.
Fig. 3 is a diagram of a commercial power low-voltage rectifier of a solar energy and commercial power complementary power generation system according to the present invention.
Detailed Description
The present invention is further described in detail below with reference to the drawings and examples so that those skilled in the art can implement the invention with reference to the description; as shown in fig. 1 to 3, the present invention provides a solar energy and commercial power complementary power generation system, which is characterized by comprising:
the light intensity detection concentration energy storage module is used for carrying out concentrated power generation and energy storage and dispersed power generation and energy storage by detecting the solar illumination intensity of solar power generation in different areas;
the mains supply photoelectric bidirectional isolation module is used for respectively isolating photovoltaic power generation from mains supply and carrying out isolation and impact conversion on concentrated power generation energy storage and dispersed power generation energy storage;
the main control adjustment complementary protection module is used for performing protection control on independent power supply adjustment and power supply complementary state adjustment through main control adjustment control;
and the photoelectric power generation commercial power complementation module is used for carrying out various power supply complementation power generation on commercial power conversion direct current power supply, centralized power generation energy storage, decentralized power generation energy storage and solar power generation power supply.
The working principle of the technical scheme is as follows: a solar energy and mains supply complementary power generation system is characterized in that a light intensity detection and energy collection and collection module and a mains supply photoelectric bidirectional isolation module are respectively connected with a main control regulation complementary protection module, and the mains supply photoelectric bidirectional isolation module and the main control regulation complementary protection module are simultaneously connected with a photoelectric power generation mains supply complementary module; the light intensity detection concentration energy storage module performs concentrated power generation and energy storage and dispersed power generation and energy storage by detecting the solar illumination intensity of solar power generation in different areas; the mains supply photoelectric bidirectional isolation module is used for respectively isolating photovoltaic power generation and mains supply and carrying out isolation and impact conversion on concentrated power generation energy storage and dispersed power generation energy storage; the main control adjustment complementary protection module performs protection control on independent power supply adjustment and power supply complementary state adjustment through main control adjustment control; the photoelectric power generation commercial power complementary module carries out various power supply complementary power generation on commercial power conversion direct current power supply, centralized power generation energy storage, decentralized power generation energy storage and solar power generation power supply.
The beneficial effects of the above technical scheme are: a solar energy and commercial power complementary power generation system is characterized in that a light intensity detection collection energy storage module and a commercial power photoelectric bidirectional isolation module are respectively connected with a main control regulation complementary protection module, and the commercial power photoelectric bidirectional isolation module and the main control regulation complementary protection module are simultaneously connected with a photoelectric power generation commercial power complementary module; the light intensity detection concentration energy storage module performs concentrated power generation and energy storage and dispersed power generation and energy storage by detecting the solar illumination intensity of solar power generation in different areas; the mains supply photoelectric bidirectional isolation module is used for respectively isolating photovoltaic power generation and mains supply and carrying out isolation and impact conversion on concentrated power generation energy storage and dispersed power generation energy storage; the main control adjustment complementary protection module performs protection control on independent power supply adjustment and power supply complementary state adjustment through main control adjustment control; the photoelectric power generation commercial power complementation module carries out various power supply complementation power generation on commercial power conversion direct current power supply, centralized power generation and energy storage, decentralized power generation and energy storage and solar power generation and power supply; the centralized power generation and energy storage and the distributed power generation and energy storage can ensure that the distribution of the power generation and energy storage is more reasonable and the efficiency of the power generation and energy storage is further improved; the isolation and impact prevention can ensure that the complementary power generation is safer and more reliable; the independent power supply and the complementary state protection control can make the switching of complementary power generation more stable; the solar energy utilization efficiency and the safety and stability complementary with the commercial power are improved.
In one embodiment, the light intensity detection set-division energy storage module comprises:
the solar light intensity detection submodule is used for detecting the solar light intensity of solar power generation in different areas through the solar light intensity detection unit;
the concentrated power generation and energy storage submodule is used for carrying out concentrated power generation and energy storage of solar power generation in a region with concentrated solar illumination intensity;
and the dispersed power generation and energy storage submodule is used for performing dispersed power generation and energy storage of solar power generation in the area with dispersed solar illumination intensity.
The operating principle of the above technical scheme is that the light intensity detection set energy storage module comprises:
the solar light intensity detection submodule is used for detecting the solar light intensity of solar power generation in different areas through the solar light intensity detection unit;
the concentrated power generation and energy storage submodule is used for carrying out concentrated power generation and energy storage of solar power generation in a region with concentrated solar illumination intensity;
and the dispersed power generation and energy storage submodule is used for performing dispersed power generation and energy storage of solar power generation in the area with dispersed solar illumination intensity.
The beneficial effects of the above technical scheme do, the light intensity detects the collection and divides the energy storage module to include: the solar light intensity detection submodule is used for detecting the solar light intensity of solar power generation in different areas through the solar light intensity detection unit; the concentrated power generation and energy storage submodule is used for performing concentrated power generation and energy storage of solar power generation in a solar illumination intensity concentrated area; and the dispersed power generation and energy storage submodule is used for performing dispersed power generation and energy storage of solar power generation in the area with dispersed solar illumination intensity.
In one embodiment, the mains photoelectric bidirectional isolation module comprises:
the reverse impact isolation submodule of the commercial power grid is used for isolating the commercial power through power frequency transformation isolation of the power grid;
the photovoltaic power generation anti-impact isolation submodule is used for carrying out photovoltaic power generation anti-impact isolation by utilizing the optical semiconductor isolation device;
and the double-end switching fluctuation isolation submodule is used for converting the direct current generated by the solar power into the direct current of the low-voltage terminal required by the low-voltage terminal through isolation by the isolation conversion device.
The operating principle of the technical scheme is that the commercial power photoelectric bidirectional isolation module comprises:
the reverse impact isolation submodule of the utility grid is used for isolating the utility grid from the utility grid through power frequency transformation isolation of the power grid;
the photovoltaic power generation anti-impact isolation submodule is used for carrying out photovoltaic power generation anti-impact isolation by utilizing the optical semiconductor isolation device;
and the double-end switching fluctuation isolation submodule is used for isolating and converting the direct current generated by the solar energy into the direct current of the low-voltage terminal required by the low-voltage terminal through the isolation conversion device.
Above-mentioned technical scheme's beneficial effect does, commercial power photoelectricity bidirectional isolation module includes: the reverse impact isolation submodule of the commercial power grid is used for isolating the commercial power through power frequency transformation isolation of the power grid; the photovoltaic power generation anti-impact isolation submodule is used for carrying out photovoltaic power generation anti-impact isolation by utilizing the optical semiconductor isolation device; and the double-end switching fluctuation isolation submodule is used for isolating and converting the direct current generated by the solar energy into the direct current of the low-voltage terminal required by the low-voltage terminal through the isolation conversion device.
In one embodiment, the master regulation complementary protection module comprises:
the main control system adjusting submodule is used for adjusting the solar power generation and the commercial power supply to independently supply power through the main control system;
the main control complementation regulation submodule is used for carrying out power supply complementation state regulation on the complementation of solar power generation and mains supply through main control complementation regulation;
and the main control protection control submodule is used for carrying out protection control on independent power supply regulation and power supply complementary state regulation.
The working principle of the technical scheme is that the main control adjustment complementary protection module comprises:
the main control system adjusting submodule is used for adjusting the solar power generation and the independent power supply adjustment of the commercial power supply through the main control system;
the main control complementation regulation submodule is used for carrying out power supply complementation state regulation on the complementation of solar power generation and mains supply through main control complementation regulation;
and the main control protection control submodule is used for carrying out protection control on independent power supply regulation and power supply complementary state regulation.
The beneficial effect of above-mentioned technical scheme does, complementary protection module is adjusted in master control includes: the main control system adjusting submodule is used for adjusting the solar power generation and the independent power supply adjustment of the commercial power supply through the main control system; the main control complementation regulation submodule is used for carrying out power supply complementation state regulation on the complementation of solar power generation and mains supply through main control complementation regulation; and the main control protection control submodule is used for carrying out protection control on independent power supply regulation and power supply complementary state regulation.
In one embodiment, the photovoltaic power generation commercial power complementary module comprises:
the commercial power low-voltage rectifier module is used for rectifying commercial power supply through a rectifier device and converting alternating commercial power into system direct current power supply;
the photovoltaic power generation stabilizing submodule is used for stabilizing the power generation of the solar power generation through the photovoltaic power generation stabilizing device;
and the energy storage and power supply complementary submodule is used for carrying out various power supply complementary power generation on the concentrated power generation energy storage, the dispersed power generation energy storage, the solar power generation power supply and the mains supply power supply.
The operating principle of the technical scheme is that the photovoltaic power generation commercial power complementary module comprises:
the commercial power low-voltage rectifier sub-module is used for rectifying commercial power supply through a rectifier device and converting alternating commercial power into system direct current power supply;
the photovoltaic power generation stabilizing submodule is used for stabilizing the power generation of the solar power generation through the photovoltaic power generation stabilizing device;
and the energy storage and power supply complementary submodule is used for carrying out various power supply complementary power generation on the concentrated power generation energy storage, the dispersed power generation energy storage, the solar power generation power supply and the mains supply power supply.
Above-mentioned technical scheme's beneficial effect does, complementary module of photoelectric generation commercial power includes: the commercial power low-voltage rectifier sub-module is used for rectifying commercial power supply through a rectifier device and converting alternating commercial power into system direct current power supply; the photovoltaic power generation stabilizing submodule is used for stabilizing the power generation of the solar power generation through the photovoltaic power generation stabilizing device; and the energy storage and power supply complementary submodule is used for carrying out various power supply complementary power generation on the concentrated power generation energy storage, the dispersed power generation energy storage, the solar power generation power supply and the mains supply power supply.
The invention discloses a solar energy and commercial power complementary power generation control method, which is characterized by comprising the following steps:
s100, concentrated power generation and energy storage and dispersed power generation and energy storage are carried out by detecting the solar illumination intensity of solar power generation in different areas;
s200, respectively carrying out isolation and anti-impact transformation on photovoltaic power generation and commercial power as well as concentrated power generation and energy storage and dispersed power generation and energy storage;
s300, performing protection control on independent power supply regulation and power supply complementary state regulation through main control regulation control;
and S400, performing various power supply complementary power generation on the commercial power conversion direct current power supply, the centralized power generation energy storage, the distributed power generation energy storage and the solar power generation power supply.
The working principle of the technical scheme is as follows: a solar energy and commercial power complementary power generation control method is characterized in that concentrated power generation and energy storage and dispersed power generation and energy storage are performed by detecting the solar illumination intensity of solar power generation in different areas; the photovoltaic power generation and the commercial power as well as the centralized power generation energy storage and the dispersed power generation energy storage are respectively isolated and impact transformation is prevented; the independent power supply regulation and the power supply complementary state regulation are protected and controlled through the master control regulation control; and the complementary power generation of various power supplies is carried out on the conversion of commercial power into direct current power supply, the centralized power generation and energy storage, the dispersed power generation and energy storage and the solar power generation and power supply.
The beneficial effects of the above technical scheme are: a solar energy and commercial power complementary power generation control method is characterized in that concentrated power generation and energy storage and dispersed power generation and energy storage are performed by detecting the solar illumination intensity of solar power generation in different areas; the photovoltaic power generation and the commercial power as well as the centralized power generation energy storage and the dispersed power generation energy storage are respectively isolated and subjected to anti-impact transformation; the independent power supply regulation and the power supply complementary state regulation are protected and controlled through the master control regulation control; the method comprises the following steps of carrying out various power supply complementary power generation on commercial power conversion direct current power supply, centralized power generation energy storage, dispersed power generation energy storage and solar power generation power supply; the centralized power generation and energy storage and the decentralized power generation and energy storage can ensure that the distribution of the power generation and energy storage is more reasonable and the efficiency of the power generation and energy storage is further improved; the isolation and impact prevention can ensure that the complementary power generation is safer and more reliable; the independent power supply and the complementary state protection control can make the switching of complementary power generation more stable; the solar energy utilization efficiency and the safety and stability complementary with the commercial power are improved.
In one embodiment, the S100 includes:
s101, detecting the solar illumination intensity of solar power generation in different areas through a solar intensity detection unit;
s102, performing concentrated power generation and energy storage of solar power generation in a solar illumination intensity concentrated area;
s103, performing distributed power generation and energy storage of solar power generation in the solar illumination intensity distributed area; calculating the energy storage potential value of the complementary state of power generation, energy storage and power supply, wherein the calculation formula is as follows:
the system comprises a power generation energy storage power supply compensation state energy storage potential value, a power generation energy storage set voltage value, a power generation energy storage polarization voltage value, a power generation energy storage capacity value, an Is power generation energy storage equivalent current value, a t power generation energy storage time, an L power generation energy storage discharge curve exponential region amplitude value, an exp index formula with a natural constant e as a base number, a J inverse number of an exponential region time constant and a R power generation energy storage internal resistance.
The working principle of the technical scheme is that the sunlight illumination intensity of solar power generation in different areas is detected by a sunlight intensity detection unit; carrying out concentrated power generation and energy storage of solar power generation in a solar illumination intensity concentrated area; carrying out dispersed power generation and energy storage of solar power generation in a solar illumination intensity dispersed area; calculating the energy storage potential value of the complementary state of power generation, energy storage and power supply, wherein the calculation formula is as follows:
buz Is an energy storage potential value in a complementary state of power generation, energy storage and power supply, uo Is a set voltage value of power generation and energy storage, N Is a polarized voltage value of power generation and energy storage, D Is a capacity value of power generation and energy storage, is an equivalent current value of power generation and energy storage, t Is power generation and energy storage time, L Is an exponential region amplitude of a power generation and energy storage discharge curve, exp Is an exponential formula taking a natural constant e as a base number, J Is the reciprocal of an exponential region time constant, and R Is internal resistance of power generation and energy storage; and the energy storage potential value of the power generation, energy storage and supply complementary state is calculated, so that the adjustment of the power supply complementary state is closer to the real potential value.
The technical scheme has the beneficial effects that the sunlight illumination intensity of solar power generation in different areas is detected through the sunlight intensity detection unit; performing concentrated power generation and energy storage of solar power generation in the solar illumination intensity concentrated area; carrying out dispersed power generation and energy storage of solar power generation in the solar illumination intensity dispersed area; calculating an energy storage potential value in a power generation, energy storage and power supply complementary state, wherein Buz Is the energy storage potential value in the power generation, energy storage and power supply complementary state, UO Is a set voltage value for power generation and energy storage, N Is a polarization voltage value for power generation and energy storage, D Is a capacity value for power generation and energy storage, is an equivalent current value for power generation and energy storage, t Is power generation and energy storage time, L Is an exponential region amplitude of a power generation and energy storage discharge curve, exp Is an exponential formula taking a natural constant e as a base number, J Is the reciprocal of an exponential region time constant, and R Is internal resistance for power generation and energy storage; by calculating the energy storage potential value of the power generation, energy storage and power supply complementary state, the adjustment of the power supply complementary state is closer to the real potential value, the complementary state is reliable to add, and the stability is higher.
In one embodiment, the S200 includes:
s201, isolating the power grid with commercial power through power frequency transformation isolation of the power grid;
s202, photovoltaic power generation anti-impact isolation is carried out by utilizing an optical semiconductor isolation device;
and S203, isolating and converting the direct current generated by the solar power into low-voltage terminal direct current required by a low-voltage terminal through an isolation conversion device.
The working principle of the technical scheme is that the power grid power frequency transformation isolation is isolated from the commercial power; photovoltaic power generation anti-impact isolation is carried out by utilizing the optical semiconductor isolation device; the direct current generated by solar energy is converted into the direct current of a low-voltage terminal required by the low-voltage terminal through isolation by an isolation conversion device.
The technical scheme has the beneficial effects that the power frequency transformation isolation of the power grid is isolated from the commercial power; photovoltaic power generation anti-impact isolation is carried out by utilizing the optical semiconductor isolation device; the direct current generated by solar energy is converted into the direct current of a low-voltage terminal required by the low-voltage terminal through isolation by an isolation conversion device.
In one embodiment, the S300 includes:
s301, adjusting solar power generation through a master control system to perform power generation and independently adjusting power supply of commercial power;
s302, performing power supply complementary state adjustment on solar power generation and mains supply complementation through master control complementary adjustment; performing supply complement state adjustment includes: s3021, outputting commercial power to supply power and charge, wherein the solar power generation output is zero, and the energy storage of the storage battery pack is zero; s3022, the commercial power energy is output to supply power for charging, the solar power generation output is zero, and the storage battery has energy storage; s3023, mains supply energy output supplies power for charging, solar power generation has energy output, a storage battery pack has energy storage, and the state is mainly controlled and complementarily regulated for offline independent operation; s3024, the mains supply has energy output, the solar power generation has energy output, the storage battery has energy storage, and the main control complementary regulation is used for online independent operation in the state; the storage battery pack is connected with mains supply charging and solar charging, and temporary energy is obtained from the outside of the main control complementary regulation and supplied to the storage battery pack when the mains supply charging and the solar charging are used in the state S3021; in the state S3022, the storage battery pack discharges, the direct current low-voltage bus is connected to the DC/DC boost conversion unit II through the DC/DC boost conversion unit II, and the DC low-voltage bus provides energy input for the electric load through the voltage conversion unit III to the output end; the control unit is used for monitoring whether the first voltage conversion unit, the second voltage conversion unit and the fourth voltage conversion unit have energy input or not, and then the state is switched to a state S3023 or a state S3024 according to the input.
And S303, carrying out protection control on the independent power supply regulation and the power supply complementary state regulation.
The working principle of the technical scheme is that the solar power generation is adjusted through a master control system to generate power and the commercial power supply is independently adjusted to supply power; the complementary power supply state adjustment is carried out on the complementation of solar power generation and mains supply through the master control complementary adjustment; performing supply complement state adjustment includes: the commercial power energy is output to supply power for charging, the solar power generation output is zero, and the energy storage of the storage battery pack is zero; the commercial power energy is output to supply power for charging, the solar power generation output is zero, and the storage battery has energy storage; the commercial power energy output supplies power for charging, the solar power generation has energy output, the storage battery has energy storage, and the state is mainly controlled and complemented for offline independent operation; s3024, the mains supply has energy output, the solar power generation has energy output, the storage battery has energy storage, and the main control complementary regulation is used for online independent operation in the state; the storage battery pack is connected with commercial power charging and solar charging, and the commercial power charging and the solar charging obtain temporary energy from the outside of the main control complementary regulation and supply the temporary energy to the storage battery pack; when the storage battery pack discharges, the direct current low-voltage bus is connected to the direct current low-voltage bus through the DC/DC direct current boost conversion unit II, and the direct current low-voltage bus provides energy input for an electric load through the voltage conversion unit III to the output end; the control unit is used for monitoring whether energy is input into the first voltage conversion unit, the second voltage conversion unit and the fourth voltage conversion unit or not, and the state is switched into a charging state and a discharging state according to the input; and carrying out protection control on the independent power supply regulation and the power supply complementary state regulation.
The technical scheme has the beneficial effects that the solar power generation is adjusted by the master control system to generate power and the mains supply is independently adjusted to supply power; the solar power generation and the commercial power supply are complemented through the master control complementation regulation to carry out power supply complementation state regulation; performing supply complement state adjustment includes: the commercial power energy is output to supply power for charging, the solar power generation output is zero, and the energy storage of the storage battery pack is zero; the commercial power energy is output to supply power for charging, the solar power generation output is zero, and the storage battery has energy storage; the commercial power energy output supplies power for charging, the solar power generation has energy output, the storage battery has energy storage, and the state is mainly controlled and complemented for offline independent operation; s3024, the mains supply has energy output, the solar power generation has energy output, the storage battery has energy storage, and the main control complementary regulation is used for online independent operation in the state; the storage battery pack is connected with mains supply charging and solar charging, and the mains supply charging and the solar charging obtain temporary energy from the outside of the main control complementary regulation and supply the temporary energy to the storage battery pack; when the storage battery pack discharges, the direct current low-voltage bus is connected to the direct current low-voltage bus through the DC/DC direct current boost conversion unit II, and the direct current low-voltage bus provides energy input for an electric load through the voltage conversion unit III to the output end; the control unit is used for monitoring whether the voltage conversion unit I, the voltage conversion unit II and the voltage conversion unit IV have energy input or not, and then the state is switched into a charging state and a discharging state according to the input; protection control is carried out on independent power supply regulation and power supply complementary state regulation; the independent power supply regulation control and the complementary power supply control are not interfered with each other, and the control of energy storage and power supply is more reasonable.
In one embodiment, the S400 includes:
s401, rectifying mains supply through a rectifying device, and converting alternating current mains supply into system direct current supply;
s402, generating power stably for solar power generation through a photoelectric power generation stabilizing device;
s403, performing multiple power supply complementary power generation on the centralized power generation energy storage, the distributed power generation energy storage, the solar power generation power supply and the mains supply; the multiple power supply complementary power generation comprises: the conversion and transmission with centralized power generation and energy storage, distributed power generation and energy storage, solar power generation and power supply and commercial power supply are realized through the main control, the regulation and conversion unit, the detection unit and the transmission unit of the complementary protection module; the main control complementary regulation submodule consists of a second DSP, a regulation conversion unit, a detection unit, a power panel and a transmission unit and realizes the control of the bidirectional conversion unit and the three-phase power grid energy flow direction management unit;
the modularized combination interface for centralized power generation and energy storage and decentralized power generation and energy storage is connected with the centralized power generation and energy storage and the decentralized power generation and energy storage; the modularized combined interface for centralized power generation and energy storage and decentralized power generation and energy storage is a plug-and-play interface, and has high insulation property and high protection level; the energy storage charging and discharging management unit releases energy from the centralized power generation and energy storage and the distributed power generation and energy storage to the low-frequency isolation conversion unit according to an instruction issued by the control unit, or charges the energy from the low-frequency isolation conversion unit to the centralized power generation and energy storage and the distributed power generation and energy storage according to an instruction issued by the control unit, and has the functions of voltage boosting and voltage reducing, and current constant current charging and discharging; the low-frequency isolation conversion unit comprises a low-voltage direct-current bus unit, a low-frequency bidirectional isolation unit and a high-voltage direct-current bus unit; the low-voltage direct-current bus unit comprises a low-voltage direct-current bus, a direct-current supporting capacitor and an AD converter, and the energy of the photovoltaic array or the centralized power generation and energy storage and the dispersed power generation and energy storage is controlled to be transmitted to the low-frequency bidirectional isolation unit; the low-frequency bidirectional isolation unit comprises a booster circuit, a low-frequency boost-buck inductor, a reactor, a voltage reduction circuit, a low-frequency rectification circuit, a low-frequency isolation transformer and an AD converter, and the purpose that the energy from the low-voltage direct-current bus is transmitted to the high-voltage direct-current bus is achieved; the high-voltage direct-current bus unit comprises a high-voltage direct-current bus, a direct-current support capacitor and an AD converter, and the purpose that energy from the low-frequency bidirectional isolation unit is transmitted to the bidirectional converter unit or the energy from the bidirectional converter unit is transmitted to the energy storage management unit is achieved.
The working principle of the technical scheme is that the commercial power is rectified through a rectifying device, and alternating commercial power is converted into system direct current power supply; the power generation stability of the solar power generation is realized through the photoelectric power generation stabilizing device; carrying out various power supply complementary power generation on the centralized power generation energy storage, the dispersed power generation energy storage, the solar power generation power supply and the mains supply power supply; the multiple power supply complementary power generation comprises: the conversion and transmission with centralized power generation and energy storage, distributed power generation and energy storage, solar power generation and power supply and commercial power supply are realized through the main control, the regulation and conversion unit, the detection unit and the transmission unit of the complementary protection module; the main control complementary regulation submodule consists of a second DSP, a regulation conversion unit, a detection unit, a power panel and a transmission unit and realizes the control of the bidirectional conversion unit and the three-phase power grid energy flow direction management unit; the modularized combination interface for centralized power generation and energy storage and decentralized power generation and energy storage is connected with the centralized power generation and energy storage and the decentralized power generation and energy storage; the modularized combined interface for centralized power generation and energy storage and decentralized power generation and energy storage is a plug-and-play interface, and has high insulation property and high protection level; the energy storage charging and discharging management unit releases energy from the centralized power generation energy storage and the distributed power generation energy storage to the low-frequency isolation conversion unit according to an instruction issued by the control unit, or charges the energy from the low-frequency isolation conversion unit to the centralized power generation energy storage and the distributed power generation energy storage according to an instruction issued by the control unit, and has the functions of voltage boosting and voltage reducing, and current constant-current charging and discharging; the low-frequency isolation conversion unit comprises a low-voltage direct-current bus unit, a low-frequency bidirectional isolation unit and a high-voltage direct-current bus unit; the low-voltage direct-current bus unit comprises a low-voltage direct-current bus, a direct-current supporting capacitor and an AD converter, and the energy of the photovoltaic array or the centralized power generation and energy storage and the dispersed power generation and energy storage is controlled to be transmitted to the low-frequency bidirectional isolation unit; the low-frequency bidirectional isolation unit comprises a booster circuit, a low-frequency boost-buck inductor, a reactor, a voltage reduction circuit, a low-frequency rectification circuit, a low-frequency isolation transformer and an AD converter, and the purpose that the energy from the low-voltage direct-current bus is transmitted to the high-voltage direct-current bus is achieved; the high-voltage direct-current bus unit comprises a high-voltage direct-current bus, a direct-current support capacitor and an AD converter, and the purpose that the energy from the low-frequency bidirectional isolation unit is transmitted to the bidirectional converter unit or the energy from the bidirectional converter unit is transmitted to the energy storage management unit is achieved.
The technical scheme has the advantages that the commercial power is rectified through the rectifying device, and the alternating commercial power is converted into system direct current power supply; the power generation stability of the solar power generation is realized through the photoelectric power generation stabilizing device; carrying out various power supply complementary power generation on the centralized power generation energy storage, the dispersed power generation energy storage, the solar power generation power supply and the mains supply power supply; the multiple power supply complementary power generation comprises: the conversion and transmission with centralized power generation and energy storage, distributed power generation and energy storage, solar power generation and power supply and commercial power supply are realized through the main control, the regulation and conversion unit, the detection unit and the transmission unit of the complementary protection module; the main control complementary regulation submodule consists of a second DSP, a regulation conversion unit, a detection unit, a power panel and a transmission unit and realizes the control of the bidirectional conversion unit and the three-phase power grid energy flow direction management unit; the modularized combination interface for centralized power generation and energy storage and decentralized power generation and energy storage is connected with the centralized power generation and energy storage and the decentralized power generation and energy storage; the modularized combined interface for centralized power generation and energy storage and decentralized power generation and energy storage is a plug-and-play interface, and has high insulation property and high protection level; the energy storage charging and discharging management unit releases energy from the centralized power generation and energy storage and the distributed power generation and energy storage to the low-frequency isolation conversion unit according to an instruction issued by the control unit, or charges the energy from the low-frequency isolation conversion unit to the centralized power generation and energy storage and the distributed power generation and energy storage according to an instruction issued by the control unit, and has the functions of voltage boosting and voltage reducing, and current constant current charging and discharging; the low-frequency isolation conversion unit comprises a low-voltage direct-current bus unit, a low-frequency bidirectional isolation unit and a high-voltage direct-current bus unit; the low-voltage direct-current bus unit comprises a low-voltage direct-current bus, a direct-current supporting capacitor and an AD converter, and the purpose of controlling the photovoltaic array or centralized power generation and energy storage and the purpose of transmitting the energy of dispersed power generation and energy storage to the low-frequency bidirectional isolation unit is achieved; the low-frequency bidirectional isolation unit comprises a booster circuit, a low-frequency boost-buck inductor, a reactor, a buck circuit, a low-frequency rectification circuit, a low-frequency isolation transformer and an AD converter, and the energy from the low-voltage direct-current bus is transferred to the high-voltage direct-current bus; the high-voltage direct-current bus unit comprises a high-voltage direct-current bus, a direct-current support capacitor and an AD converter, and the purpose that the energy from the low-frequency bidirectional isolation unit is transmitted to the bidirectional converter unit or the energy from the bidirectional converter unit is transmitted to the energy storage management unit is achieved; the power generation stability and the timeliness and complementary efficiency of various power supply complementary power generation can be improved.
While embodiments of the invention have been described above, it is not intended to be limited to the details shown, described and illustrated herein, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed, and to such extent that such modifications are readily available to those skilled in the art, and it is not intended to be limited to the details shown and described herein without departing from the general concept as defined by the appended claims and their equivalents.
Claims (10)
1. A complementary power generation system based on solar energy and commercial power is characterized by comprising:
the light intensity detection concentration energy storage module is used for carrying out concentrated power generation and energy storage and dispersed power generation and energy storage by detecting the solar illumination intensity of solar power generation in different areas;
the mains supply photoelectric bidirectional isolation module is used for respectively isolating photovoltaic power generation from mains supply and carrying out isolation and impact conversion on concentrated power generation energy storage and dispersed power generation energy storage;
the main control adjustment complementary protection module is used for performing protection control on independent power supply adjustment and power supply complementary state adjustment through main control adjustment control;
the photovoltaic power generation commercial power complementary module is used for carrying out various power supply complementary power generation on commercial power conversion direct current power supply, centralized power generation energy storage, decentralized power generation energy storage and solar power generation power supply.
2. The complementary solar-electric power generation system as claimed in claim 1, wherein the light intensity detection set energy storage module comprises:
the solar light intensity detection submodule is used for detecting the solar light intensity of solar power generation in different areas through the solar light intensity detection unit;
the concentrated power generation and energy storage submodule is used for carrying out concentrated power generation and energy storage of solar power generation in a region with concentrated solar illumination intensity;
and the dispersed power generation and energy storage submodule is used for performing dispersed power generation and energy storage of solar power generation in the solar illumination intensity dispersed area.
3. The solar-electric complementary power generation system of claim 1, wherein the mains photoelectric bidirectional isolation module comprises:
the reverse impact isolation submodule of the utility grid is used for isolating the utility grid from the utility grid through power frequency transformation isolation of the power grid;
the photovoltaic power generation anti-impact isolation submodule is used for carrying out photovoltaic power generation anti-impact isolation by utilizing the optical semiconductor isolation device;
and the double-end switching fluctuation isolation submodule is used for converting the direct current generated by the solar power into the direct current of the low-voltage terminal required by the low-voltage terminal through isolation by the isolation conversion device.
4. The solar-based and commercial-power complementary power generation system of claim 1, wherein the master-control regulation complementary protection module comprises:
the main control system adjusting submodule is used for adjusting the solar power generation and the independent power supply adjustment of the commercial power supply through the main control system;
the main control complementary adjusting submodule is used for adjusting the complementary power supply state of the solar power generation and the commercial power supply through main control complementary adjustment;
and the main control protection control submodule is used for carrying out protection control on independent power supply regulation and power supply complementary state regulation.
5. The solar-based and commercial power complementary power generation system of claim 1, wherein the photovoltaic power generation commercial power complementary module comprises:
the commercial power low-voltage rectifier module is used for rectifying commercial power supply through a rectifier device and converting alternating commercial power into system direct current power supply;
the photovoltaic power generation stabilizing submodule is used for stabilizing the power generation of the solar power generation through the photovoltaic power generation stabilizing device;
and the energy storage and power supply complementary submodule is used for carrying out various power supply complementary power generation on the concentrated power generation energy storage, the dispersed power generation energy storage, the solar power generation power supply and the mains supply power supply.
6. A solar energy and commercial power complementary power generation control method is characterized by comprising the following steps:
s100, concentrated power generation and energy storage and dispersed power generation and energy storage are carried out by detecting the solar illumination intensity of solar power generation in different areas;
s200, respectively carrying out isolation and anti-impact transformation on photovoltaic power generation and commercial power as well as concentrated power generation and energy storage and dispersed power generation and energy storage;
s300, performing protection control on independent power supply regulation and power supply complementary state regulation through master control regulation control;
and S400, performing various power supply complementary power generation on the commercial power conversion direct current power supply, the centralized power generation energy storage, the dispersed power generation energy storage and the solar power generation power supply.
7. The method according to claim 6, wherein the S100 comprises:
s101, detecting the solar illumination intensity of solar power generation in different areas through a solar intensity detection unit;
s102, carrying out concentrated power generation and energy storage of solar power generation in a solar illumination intensity concentrated area;
and S103, performing distributed power generation and energy storage of solar power generation in the area with distributed solar illumination intensity.
8. The solar energy and commercial power complementary power generation control method according to claim 6, wherein the S200 comprises:
s201, isolating the power grid with commercial power through power frequency transformation isolation of the power grid;
s202, photovoltaic power generation anti-impact isolation is carried out by utilizing a photo-semiconductor isolation device;
and S203, isolating and converting the direct current generated by the solar power into low-voltage terminal direct current required by a low-voltage terminal through an isolation conversion device.
9. The solar energy and commercial power complementary power generation control method according to claim 6, wherein the S300 comprises:
s301, adjusting solar power generation and independent power supply adjustment of mains supply through a master control system;
s302, performing power supply complementary state adjustment on solar power generation and mains supply complementation through master control complementary adjustment; performing supply complement state adjustment includes: s3021, outputting commercial power to supply power and charge, wherein the solar power generation output is zero, and the energy storage of the storage battery pack is zero; s3022, the commercial power energy is output to supply power for charging, the solar power generation output is zero, and the storage battery has energy storage; s3023, mains supply energy output supplies power for charging, solar power generation has energy output, a storage battery pack has energy storage, and the state is mainly controlled and complementarily regulated for offline independent operation; s3024, the mains supply has energy output, the solar power generation has energy output, the storage battery has energy storage, and the main control complementary regulation is used for online independent operation in the state; the storage battery pack is connected with mains supply charging and solar charging, and temporary energy is obtained from the outside of the main control complementary regulation and supplied to the storage battery pack when the mains supply charging and the solar charging are used in the state S3021; in the state S3022, the storage battery pack discharges, the direct current low-voltage bus is connected to the DC/DC boost conversion unit II through the DC/DC boost conversion unit II, and the DC low-voltage bus provides energy input for the electric load through the voltage conversion unit III to the output end; the control unit is used for monitoring whether the first voltage conversion unit, the second voltage conversion unit and the fourth voltage conversion unit have energy input or not, and then the state is switched to a state S3023 or a state S3024 according to the input;
and S303, carrying out protection control on the independent power supply regulation and the power supply complementary state regulation.
10. The solar energy and commercial power complementary power generation control method according to claim 6, wherein the S400 comprises:
s401, rectifying the mains supply through a rectifying device, and converting alternating current mains supply into system direct current supply;
s402, generating power stably for solar power generation through a photoelectric power generation stabilizing device;
s403, performing multiple power supply complementary power generation on the centralized power generation energy storage, the distributed power generation energy storage, the solar power generation power supply and the mains supply; the multiple power supply complementary power generation comprises: the conversion and transmission with centralized power generation and energy storage, distributed power generation and energy storage, solar power generation and power supply and commercial power supply are realized through the main control, the regulation and conversion unit, the detection unit and the transmission unit of the complementary protection module; the main control complementary regulation submodule consists of a second DSP, a regulation conversion unit, a detection unit, a power panel and a transmission unit and realizes the control of the bidirectional conversion unit and the three-phase power grid energy flow direction management unit;
the modularized combination interface for centralized power generation and energy storage and decentralized power generation and energy storage is connected with the centralized power generation and energy storage and the decentralized power generation and energy storage; the modularized combined interface for centralized power generation and energy storage and decentralized power generation and energy storage is a plug-and-play interface, and has high insulation property and high protection level; the energy storage charging and discharging management unit releases energy from the centralized power generation and energy storage and the distributed power generation and energy storage to the low-frequency isolation conversion unit according to an instruction issued by the control unit, or charges the energy from the low-frequency isolation conversion unit to the centralized power generation and energy storage and the distributed power generation and energy storage according to an instruction issued by the control unit, and has the functions of voltage boosting and voltage reducing, and current constant current charging and discharging; the low-frequency isolation conversion unit comprises a low-voltage direct-current bus unit, a low-frequency bidirectional isolation unit and a high-voltage direct-current bus unit; the low-voltage direct-current bus unit comprises a low-voltage direct-current bus, a direct-current supporting capacitor and an AD converter, and the purpose of controlling the photovoltaic array or centralized power generation and energy storage and the purpose of transmitting the energy of dispersed power generation and energy storage to the low-frequency bidirectional isolation unit is achieved; the low-frequency bidirectional isolation unit comprises a booster circuit, a low-frequency boost-buck inductor, a reactor, a voltage reduction circuit, a low-frequency rectification circuit, a low-frequency isolation transformer and an AD converter, and the purpose that the energy from the low-voltage direct-current bus is transmitted to the high-voltage direct-current bus is achieved; the high-voltage direct-current bus unit comprises a high-voltage direct-current bus, a direct-current support capacitor and an AD converter, and the purpose that energy from the low-frequency bidirectional isolation unit is transmitted to the bidirectional converter unit or the energy from the bidirectional converter unit is transmitted to the energy storage management unit is achieved.
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