CN114567004A - Photovoltaic energy storage system-based black start control system and method - Google Patents
Photovoltaic energy storage system-based black start control system and method Download PDFInfo
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- CN114567004A CN114567004A CN202210173744.8A CN202210173744A CN114567004A CN 114567004 A CN114567004 A CN 114567004A CN 202210173744 A CN202210173744 A CN 202210173744A CN 114567004 A CN114567004 A CN 114567004A
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- 238000004891 communication Methods 0.000 claims abstract description 111
- 238000004804 winding Methods 0.000 claims description 26
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- 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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention provides a black start control system and method based on a photovoltaic energy storage system, which have low investment and operation cost, can still enable an inverter to be started to enter a normal working state under the condition of no photovoltaic electricity or commercial power, and meet the power supply requirement of grid-connected or off-grid load; the system comprises a power supply module, a power supply management module and an inverter communication module; the power supply module is connected with the power supply management module and used for supplying power to the power supply management module; the power supply management module is connected with the power supply module, the inverter communication module and the inverter module and is used for communicating with the inverter communication module to exchange data and supplying power to the inverter module; the inverter communication module is connected with the power supply management module and the inverter module and used for judging the awakening of the black start, starting the inverter module after the communication is established with the power supply management module and the inverter module, and recovering the operation of the power grid by utilizing the started inverter module.
Description
Technical Field
The invention relates to the technical field of photovoltaic energy storage, in particular to a black start control system and method based on a photovoltaic energy storage system.
Background
Along with the rapid development of world economy, the demand of human beings on energy is increasing day by day, solar energy is continuously developed as one of clean energy, and a photovoltaic power generation technology based on solar energy utilization also gets wide attention. The existing photovoltaic power generation grid-connected technology is that solar radiation energy is converted through a photovoltaic power supply, then direct current electric energy converted from the solar radiation energy is gathered into a photovoltaic grid-connected inverter, the photovoltaic grid-connected inverter inverts the direct current electric energy into alternating current to be sent into a power grid, and therefore the existing inverter needs a photovoltaic power supply or mains supply to be started, but the generated energy of the photovoltaic power supply is influenced by weather and sunshine conditions, if the weather is severe or the sunshine conditions are poor, the generated energy of the photovoltaic power supply can be output insufficiently or can not be generated, and then the inverter can not be started to enter a normal working state under the condition that no photovoltaic power or mains supply exists, and the grid-connected or off-grid load power supply requirements can not be met; under the condition, the conventional diesel generator generates electricity to temporarily supply electricity for black start when the power grid is not powered, but the investment and operation cost are high.
Disclosure of Invention
Aiming at the problems, the invention provides a black start control system and method based on a photovoltaic energy storage system, which have low investment and operation cost, can still start an inverter to enter a normal working state under the condition of no photovoltaic electricity or commercial power, and meet the power supply requirements of grid-connected or off-grid loads.
The technical scheme is as follows: the utility model provides a black start control system based on photovoltaic energy storage system, its is including connecing in the inverter module between photovoltaic power and electric wire netting, its characterized in that: the power supply management module is connected with the inverter communication module;
the power supply module is connected with the power supply management module and used for supplying power to the power supply management module;
the power supply management module is connected with the power supply module, the inverter communication module and the inverter module, and is used for communicating with the inverter communication module to exchange data and supplying power to the inverter module;
the inverter communication module is connected with the power supply management module and the inverter module and used for judging the awakening of the black start, starting the inverter module after establishing communication with the power supply management module and the inverter module, and recovering the operation of a power grid by utilizing the started inverter module.
Further, the inverter communication module is connected with a black-start power supply switch S1, and is connected with a black-start power supply through the black-start power supply switch S1, and is configured to determine that the black start is awakened according to the on/off of the black-start power supply switch S1; the black start power supply adopts a mobile charger baby;
further, the power supply module comprises a battery module, a fuse F1, a cell sampler U1 and a battery controller U2, wherein the battery module is formed by connecting a plurality of batteries in series; the battery core sampler U1 is a model LTC6803 chip, the battery controller U2 is a model PIC18F45K80 chip, and the battery core sampler U1 is connected with the battery module and used for detecting the voltage and the temperature of a battery core in the battery module; the battery controller U2 is connected with the cell sampler U1 and is used for outputting a communication instruction to the cell sampler U1; the negative electrode end of the battery module is connected with one end of the fuse F1;
further, the power supply management module comprises a transformer TR1, a MOS transistor Q1, a fuse F2, a current sensor I1, a crystal oscillator Y1, a pre-charging resistor R0, relays RLY1 to RLY3, a BMS main controller U3 and a BMS slave controller U4, wherein the BMS main controller U3 adopts a model SPC5646CCF0MLT1 chip, and the BMS slave controller U4 adopts a model PIC18F25K80 chip; the BMS master controller U3 is in communication connection with the BMS slave controllers U4 and U2, the BMS master controller U3 and U4 are in control connection with the relays RLY1 to RLY3, respectively, the other end of the fuse F1 is connected with the source of the MOS transistor Q1 and one end of the relay RLY3 and then grounded, the positive terminal of the battery module is connected with one end of the fuse F2 and one end of the primary winding of the transformer TR1, the other end of the primary winding of the transformer TR1 is connected with the drain of the MOS transistor Q1, the other end of the fuse F2 is connected with one end of the relay RLY1 and one end of a pre-charge resistor 695R 2, one end of the secondary winding of the transformer TR1 is connected to the BMS slave controller U4, the other end of the secondary winding of the transformer TR1 is grounded, and the other end of the pre-charge resistor R0 is connected with one end of the relay RLY2, the other ends of the relay RLY1 and RLY2 are connected and then connected with one end of the current sensor I1, the other end of the current sensor I1 is connected with one end of the crystal oscillator Y1, the other end of the crystal oscillator Y1 is connected with the other end of the relay RLY3 and then grounded, and the current sensor I1 and the crystal oscillator Y1 are both connected with the BMS slave controller U4;
further, the inverter communication module comprises pre-charging resistors R1, R2, a capacitor C1, diodes D1, D2, a crystal oscillator Y2, switching tubes T1, T2, T3, relays RLY4, RLY5, a transformer TR2, an inductor L, a switch S2, an inverter main controller U5 and an inverter communication controller U6, wherein the inverter main controller U5 and the inverter communication controller U6 are all of type XMC4700 chips; one end of the current sensor I1 is connected to one end of the pre-charge resistor R1, one end of the relay RLY4 and the anode of the diode D1, the inverter main controller U5 is connected to the relays RLY4 and RLY5, the inverter main controller U5 is connected to the BMS main controller U3 and the inverter communication controller U6 in a communication manner, the inverter communication controller U6 is connected to the BMS main controller U3 in a communication manner after passing through the switch S2, the black start power supply is connected to one end of the black start power supply switch S1, and the other end of the black start power supply switch S1 is connected to the gates of the inverter communication controller U6 and the MOS transistor Q1; the other end of the relay RLY4 is connected with one end of the relay RLY5, the other end of a pre-charging resistor R1 and one end of a pre-charging resistor R2, the other end of the relay RLY5 is connected with the other end of a pre-charging resistor R2 and one end of an inductor L, the other end of the inductor L is connected with an emitter of the switching tube T2 and a collector of the switching tube T1, a collector of the switching tube T2 is connected with a positive electrode of the diode D2, one end of a crystal oscillator Y2 and one end of a capacitor C1, the crystal oscillator Y2 is connected with the inverter main controller U5, a negative electrode of the diode D2 is connected with a negative electrode of the diode D1 and one end of a primary winding of a transformer TR2, one end of a secondary winding of the transformer TR2 is connected with the inverter main controller U5 and the inverter communication controller U6, and the other end of a secondary winding of the transformer TR2 is grounded, the other end of the primary winding of the transformer TR2 is connected with the collector of the switch tube T3, and the emitters of the switch tubes T1 and T3 are connected with the other ends of the capacitor C1, the crystal oscillator Y2 and the relay RLY3 and then grounded;
a black start control method based on a photovoltaic energy storage system is characterized by comprising the following steps: which comprises the following steps:
after the black start power supply is connected to the black start power supply through the black start power supply switch, the inverter communication module identifies a black start signal and establishes communication with the power supply management module and the inverter module;
starting the power supply module and the power supply management module according to a black start wake-up signal sent by the inverter communication module;
and after the inverter module finishes charging, communicating a black start completion signal to the power supply management module and the inverter communication module to finish black start, and recovering normal operation of the power grid through the started inverter module.
Further, it also includes the steps of: when a black start power supply is not accessed, the power supply module supplies power to start the inverter communication module so as to wake up the black start to enter the black start operation until the inverter module is charged, and the started inverter module recovers the normal operation of a power grid;
further, after the black start power supply switch is connected to a black start power supply, the inverter communication module sends a black start wake-up signal to the power supply management module, if the inverter communication module receives a black start response signal of the power supply management module, the inverter communication module enters into black start operation until a power grid normally operates, and if the inverter communication module cannot receive the black start response signal of the power supply management module, the inverter communication module continues to wait for the black start response signal of the power supply management module;
furthermore, after the black start power supply switch is connected to a black start power supply, under the power-on working condition of the power supply management module, if the power supply management module receives an operation signal of the inverter module, the power grid operates normally, and non-black start operation is realized; if the running signal of the inverter module is not received, entering black start running according to a black start awakening signal sent by the inverter communication module;
further, when the power supply management module does not receive the operation signal of the inverter module, the method further comprises the following steps:
s1.1, if the power supply management module does not receive a black start wake-up signal sent by the inverter communication module, continuing to wait for a command signal to perform non-black start operation or black start operation; if the power supply management module receives a black start awakening signal sent by the inverter communication module, continuing the next step;
s1.2, the power supply management module sends a black start response signal to the inverter communication module, and the power supply module starts to operate;
s1.3, the inverter communication module sends a black start state signal to the inverter module, and the inverter module is charged;
s1.4, if the power supply management module and the inverter communication module receive a black start completion signal sent by the inverter module, ending the black start, and recovering the normal operation of the power grid through the started inverter module; and if the power supply management module and the inverter communication module do not receive a black start completion signal sent by the inverter module, continuing to the step S1.3.
The invention has the advantages that the communication among the inverter communication module, the power supply management module and the inverter module can be established, the black start operation mode is entered, the inverter module is charged and started, and then the grid operation can be recovered through the started inverter module, so that the inverter can be started to enter the normal working state under the condition of no photovoltaic power or commercial power, the grid-connected or off-grid load power supply requirement is met, the investment and operation cost are low, and the economic use value is good.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a circuit schematic of the present invention;
fig. 3 is a flow chart of the present invention.
Detailed Description
As shown in fig. 1 to 3, the black start control system based on a photovoltaic energy storage system of the present invention includes an inverter module connected between a photovoltaic power source and a power grid, the inverter module is used for converting a dc power source into an ac power source and sending the ac power source into the power grid, and further includes a power supply module, a power supply management module, and an inverter communication module;
the power supply module is connected with the power supply management module and used for supplying power to the power supply management module, detecting data of each battery cell and uploading all the data to the power supply management module;
the power supply management module is connected with the power supply module, the inverter communication module and the inverter module and is used for communicating with the inverter communication module to exchange data and supplying power to the inverter module;
and the inverter communication module is connected with the power supply management module and the inverter module and used for judging the awakening of the black start, starting the inverter module after establishing communication with the power supply management module and the inverter module, and recovering the operation of the power grid by using the started inverter module.
The inverter communication module is connected with the black start power supply switch S1, is connected with the black start power supply through the black start power supply switch S1 and is used for judging the awakening of the black start according to the opening and closing of the black start power supply switch S1; the removal that black start power adopted treasured that charges.
The power supply module comprises a battery module, a fuse F1, a cell sampler U1 and a battery controller U2, wherein the battery module is formed by connecting a plurality of batteries BT in series; the cell sampler U1 is connected with the battery module and used for detecting the voltage and the temperature of a cell in the battery module; the battery controller U2 is connected with the cell sampler U1 and is used for outputting a communication instruction to the cell sampler U1; the negative end of the battery module is connected with one end of a fuse F1;
the power supply management module comprises a transformer TR1, a MOS tube Q1, a fuse F2, a current sensor I1, a crystal oscillator Y1, a pre-charging resistor R0, relays RLY 1-RLY 3, a BMS main controller U3 and a BMS slave controller U4, wherein the BMS main controller U4 is in communication connection with the BMS slave controller U4 and the battery controller U4, the BMS main controller U4 and the BMS slave controller U4 are in control connection with the relays RLY 4-RLY 4 respectively, the other end of the fuse F4 is connected with the source of the MOS tube Q4 and one end of the relay RLY4 and then grounded, the positive terminal of the battery module is connected with one end of the pre-charging resistor R4 and one end of the primary winding of the transformer TR 4, the other end of the primary winding of the transformer TR 4 is connected with the drain of the MOS tube Q4, the other end of the fuse F4 is connected with one end of the pre-charging relay TR 4 and the secondary winding of the relay TR 4, one end of the transformer 4 is connected with the secondary winding of the secondary winding of the relay TR 4, and the secondary winding of the BMS secondary of the transformer 4 is grounded, the other end of the pre-charging resistor R0 is connected with one end of a relay RLY2, the other ends of the relays RLY1 and RLY2 are connected and then connected with one end of a current sensor I1, the other end of the current sensor I1 is connected with one end of a crystal oscillator Y1, the other end of the crystal oscillator Y1 is connected with the other end of the relay RLY3 and then grounded, and the current sensor I1 and the crystal oscillator Y1 are both connected with a BMS slave controller U4;
the inverter communication module comprises pre-charging resistors R1 and R2, a capacitor C1, diodes D1 and D2, a crystal oscillator Y2, a switching tube T1, a T2 and a T3, a relay RLY4, a RLY5, a transformer TR2, an inductor L, a switch S2, an inverter main controller U5 and an inverter communication controller U6, one end of a current sensor I1 is connected with one end of a pre-charging resistor R1, one end of a relay RLY4 and the anode of a diode D1, an inverter main controller U5 is connected with relays RLY4 and RLY5, the inverter main controller U5 is in communication connection with the BMS main controller U3 and the inverter communication controller U6, the inverter communication controller U6 is in communication connection with the BMS main controller U3 after passing through a switch S2, a black start power supply is connected with one end of a black start power supply switch S1, and the other end of the black start power supply switch S1 is connected with the inverter communication controller U6 and the grid of a MOS transistor Q1; the other end of the relay RLY4 is connected with one end of a relay RLY5, the other end of a pre-charging resistor R1 and one end of a pre-charging resistor R2, the other end of the relay RLY5 is connected with the other end of a pre-charging resistor R2 and one end of an inductor L, the other end of the inductor L is connected with an emitter of a switching tube T2 and a collector of a switching tube T1, a collector of the switching tube T2 is connected with an anode of a diode D2, one end of a crystal oscillator Y2 and one end of a capacitor C1, a crystal oscillator Y2 is connected with an inverter main controller U5, a cathode of a diode D2 is connected with a cathode of a diode D1 and one end of a primary winding of a transformer TR2, one end of a secondary winding of the transformer TR2 is respectively connected with an inverter U5 and an inverter communication controller U6, the other end of a secondary winding of the transformer TR2 is grounded, and the other end of the primary winding of the transformer TR2 is connected with a collector of the switching tube T3, the emitters of the switch tubes T1 and T3 are connected with the capacitor C1, the other end of the crystal oscillator Y2 and the other end of the relay RLY3, and then grounded.
The cell sampler U1 adopts a model LTC6803 chip, is used for detecting the voltage and temperature of the battery BT, and is communicated with the battery controller U2;
the battery controller U2 adopts a model PIC18F45K80 chip and is communicated with the BMS main controller U3;
the BMS main controller U3 adopts a model SPC5646CCF0MLT1 chip, can play a role in system abnormal protection, can calculate the BT capacity and service life of the battery, calculates the charging and discharging power allowed by the battery according to the battery state, communicates data with the inverter main controller U5 and the inverter communication controller U6, and gives the allowed charging and discharging power to the inverter module; the BMS slave controller U4 adopts a model PIC18F25K80 chip and is communicated with the BMS master controller U3;
the inverter main controller U5 adopts a model XMC4700 chip, can play a role in system abnormity protection, is used for receiving data of the inverter communication controller U6 and the BMS main controller U3 and issuing corresponding instructions;
the inverter communication controller U6 adopts a model XMC4700 chip, can play a role in system abnormity protection, is used for receiving external data (namely receiving a black start signal after black start of a power supply switch), and communicates with the inverter main controller U5 and the BMS main controller U3.
A black start control method based on a photovoltaic energy storage system comprises the following steps:
when a black start power supply is not accessed, namely the whole system is in a shutdown state, the power supply module supplies power to start the inverter communication module so as to wake up the black start to enter the black start operation until the inverter module finishes charging, and the started inverter module recovers the normal operation of a power grid;
after the black start power supply is connected through the black start power supply switch, the inverter communication module identifies a black start signal and establishes communication with the power supply management module and the inverter module;
starting the power supply module and the power supply management module according to a black start wake-up signal sent by the inverter communication module;
and after the inverter module finishes charging, communicating a black start finishing signal to the power supply management module and the inverter communication module so as to finish black start, and recovering normal operation of the power grid through the started inverter module.
Specifically, after the black start power supply is connected to the black start power supply through the black start power supply switch, the inverter communication module sends a black start wake-up signal to the power supply management module, if the inverter communication module receives a black start response signal of the power supply management module, the inverter communication module enters into black start operation until the power grid normally operates, and if the inverter communication module cannot receive the black start response signal of the power supply management module, the inverter communication module continues to wait for the black start response signal of the power supply management module;
or after the black start power supply switch is connected to the black start power supply, under the condition that the power supply management module is powered on to work, if the power supply management module receives an operation signal of the inverter module, the power grid normally operates, and non-black start operation is realized; if the power supply management module does not receive the operation signal of the inverter module, the method comprises the following steps:
s1.1, if the power supply management module does not receive a black start wake-up signal sent by the inverter communication module, continuing to wait for a command signal to perform non-black start operation or black start operation; if the power supply management module receives a black start awakening signal sent by the inverter communication module, continuing the next step;
s1.2, the power supply management module sends a black start response signal to the inverter communication module, and the power supply module starts to operate;
s1.3, the inverter communication module sends a black start state signal to the inverter module, the inverter module is charged, namely the relay RLY5 is closed, the capacitor C1 is charged, the relay RLY4 is closed until the voltage of the capacitor C1 is more than or equal to 99% of the voltage of the battery module, the charging of the inverter module is completed, and the black start completion signal is communicated to the power supply management module and the inverter communication module;
s1.4, if the power supply management module and the inverter communication module receive a black start completion signal sent by the inverter module, namely the charging of the inverter module is completed, ending the black start, and recovering the normal operation of the power grid through the started inverter module; and if the power supply management module and the inverter communication module do not receive the black start completion signal sent by the inverter module, continuing to step S1.3.
The normal operation refers to the starting of the inverter module, and the grid operation is recovered through the started inverter module.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides a black start control system based on photovoltaic energy storage system, its is including connecing in the inverter module between photovoltaic power and electric wire netting, its characterized in that: the power supply management module is connected with the inverter communication module;
the power supply module is connected with the power supply management module and used for supplying power to the power supply management module;
the power supply management module is connected with the power supply module, the inverter communication module and the inverter module, and is used for communicating with the inverter communication module to exchange data and supplying power to the inverter module;
the inverter communication module is connected with the power supply management module and the inverter module and used for judging the awakening of black start, starting the inverter module after establishing communication with the power supply management module and the inverter module, and recovering the operation of a power grid by utilizing the started inverter module.
2. The photovoltaic energy storage system-based black start control system according to claim 1, wherein: the inverter communication module is connected with a black start power supply switch S1, is connected with a black start power supply through the black start power supply switch S1, and is used for judging black start awakening according to the opening and closing of the black start power supply switch S1; the removal that black start power adopted treasured that charges.
3. The photovoltaic energy storage system-based black start control system according to claim 2, wherein: the power supply module comprises a battery module, a fuse F1, a cell sampler U1 and a battery controller U2, wherein the battery module is formed by connecting a plurality of batteries in series; the battery core sampler U1 is a model LTC6803 chip, the battery controller U2 is a model PIC18F45K80 chip, and the battery core sampler U1 is connected with the battery module and used for detecting the voltage and the temperature of a battery core in the battery module; the battery controller U2 is connected with the cell sampler U1 and is used for outputting a communication instruction to the cell sampler U1; and the negative electrode end of the battery module is connected with one end of the fuse F1.
4. The photovoltaic energy storage system-based black start control system according to claim 3, wherein: the power supply management module comprises a transformer TR1, a MOS tube Q1, a fuse F2, a current sensor I1, a crystal oscillator Y1, a pre-charging resistor R0, relays RLY 1-RLY 3, a BMS main controller U3 and a BMS slave controller U4, wherein the BMS main controller U3 adopts a model SPC5646CCF0MLT1 chip, and the BMS slave controller U4 adopts a model PIC18F25K80 chip; the BMS master controller U3 is in communication connection with the BMS slave controllers U4 and U2, the BMS master controller U3 and U4 are in control connection with the relays RLY1 to RLY3, respectively, the other end of the fuse F1 is connected with the source of the MOS transistor Q1 and one end of the relay RLY3 and then grounded, the positive terminal of the battery module is connected with one end of the fuse F2 and one end of the primary winding of the transformer TR1, the other end of the primary winding of the transformer TR1 is connected with the drain of the MOS transistor Q1, the other end of the fuse F2 is connected with one end of the relay RLY1 and one end of a pre-charge resistor 695R 2, one end of the secondary winding of the transformer TR1 is connected to the BMS slave controller U4, the other end of the secondary winding of the transformer TR1 is grounded, and the other end of the pre-charge resistor R0 is connected with one end of the relay RLY2, the other ends of the relay RLY1 and the RLY2 are connected and then connected with one end of the current sensor I1, the other end of the current sensor I1 is connected with one end of the crystal oscillator Y1, the other end of the crystal oscillator Y1 is connected with the other end of the relay RLY3 and then grounded, and the current sensor I1 and the crystal oscillator Y1 are both connected with the BMS slave controller U4.
5. The photovoltaic energy storage system-based black start control system according to claim 4, wherein: the inverter communication module comprises pre-charging resistors R1 and R2, a capacitor C1, diodes D1 and D2, a crystal oscillator Y2, a switching tube T1, a switching tube T2 and T3, a relay RLY4, a RLY5, a transformer TR2, an inductor L, a switch S2, an inverter main controller U5 and an inverter communication controller U6, wherein the inverter main controller U5 and the inverter communication controller U6 are all chips of type XMC 4700; one end of the current sensor I1 is connected to one end of the pre-charge resistor R1, one end of the relay RLY4 and the anode of the diode D1, the inverter main controller U5 is connected to the relays RLY4 and RLY5, the inverter main controller U5 is connected to the BMS main controller U3 and the inverter communication controller U6 in a communication manner, the inverter communication controller U6 is connected to the BMS main controller U3 in a communication manner after passing through the switch S2, the black start power supply is connected to one end of the black start power supply switch S1, and the other end of the black start power supply switch S1 is connected to the gates of the inverter communication controller U6 and the MOS transistor Q1; the other end of the relay RLY4 is connected with one end of the relay RLY5, the other end of a pre-charging resistor R1 and one end of a pre-charging resistor R2, the other end of the relay RLY5 is connected with the other end of a pre-charging resistor R2 and one end of an inductor L, the other end of the inductor L is connected with an emitter of the switching tube T2 and a collector of the switching tube T1, a collector of the switching tube T2 is connected with a positive electrode of the diode D2, one end of a crystal oscillator Y2 and one end of a capacitor C1, the crystal oscillator Y2 is connected with the inverter main controller U5, a negative electrode of the diode D2 is connected with a negative electrode of the diode D1 and one end of a primary winding of a transformer TR2, one end of a secondary winding of the transformer TR2 is connected with the inverter main controller U5 and the inverter communication controller U6, and the other end of a secondary winding of the transformer TR2 is grounded, the other end of the primary winding of the transformer TR2 is connected with the collector of the switch tube T3, and the emitters of the switch tubes T1 and T3 are connected with the other ends of the capacitor C1, the crystal oscillator Y2 and the relay RLY3 and then grounded.
6. A black start control method based on a photovoltaic energy storage system is characterized by comprising the following steps: which comprises the following steps:
after the black start power supply is connected to the black start power supply through the black start power supply switch, the inverter communication module identifies a black start signal and establishes communication with the power supply management module and the inverter module;
starting the power supply module and the power supply management module according to a black start wake-up signal sent by the inverter communication module;
and after the inverter module finishes charging, communicating a black start completion signal to the power supply management module and the inverter communication module to finish black start, and recovering normal operation of the power grid through the started inverter module.
7. The photovoltaic energy storage system-based black start control method according to claim 6, wherein: it also includes the steps: when the black start power supply is not accessed, the power supply module supplies power to start the inverter communication module so as to wake up the black start to enter the black start operation until the inverter module finishes charging, and the inverter module which is started recovers the normal operation of a power grid.
8. The photovoltaic energy storage system-based black-start control method according to claim 6, characterized in that: after the black start power supply switch is connected to a black start power supply, the inverter communication module sends a black start wake-up signal to the power supply management module, if the inverter communication module receives a black start response signal of the power supply management module, the inverter communication module enters into black start operation until a power grid normally operates, and if the inverter communication module cannot receive the black start response signal of the power supply management module, the inverter communication module continues to wait for the black start response signal of the power supply management module.
9. The photovoltaic energy storage system-based black start control method according to claim 6, wherein: after the black start power supply switch is connected to a black start power supply, under the condition that the power supply management module is powered on to work, if the power supply management module receives an operation signal of the inverter module, the power grid normally operates, and non-black start operation is realized; and if the running signal of the inverter module is not received, entering black start running according to a black start awakening signal sent by the inverter communication module.
10. The photovoltaic energy storage system-based black start control method according to claim 9, wherein: when the power supply management module does not receive the operation signal of the inverter module, the method further comprises the following steps:
s1.1, if the power supply management module does not receive a black start wake-up signal sent by the inverter communication module, continuing to wait for a command signal to perform non-black start operation or black start operation; if the power supply management module receives a black start awakening signal sent by the inverter communication module, continuing the next step;
s1.2, the power supply management module sends a black start response signal to the inverter communication module, and the power supply module starts to operate;
s1.3, the inverter communication module sends a black start state signal to the inverter module, and the inverter module is charged;
s1.4, if the power supply management module and the inverter communication module receive a black start completion signal sent by the inverter module, ending the black start, and recovering the normal operation of the power grid through the started inverter module; and if the power supply management module and the inverter communication module do not receive a black start completion signal sent by the inverter module, continuing to the step S1.3.
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