Black-start control method and system for optical hydrogen storage micro-grid, storage medium and product

Abstract

The invention discloses a black-start control method and system for a light hydrogen storage micro-grid, a storage medium and a product, and relates to the technical field of black-start control of the light hydrogen storage micro-grid, and the method comprises the steps: controlling a photovoltaic unit to be merged into a DC bus, and controlling the photovoltaic unit to output first preset power based on a limited power control mode; when the first voltage of the direct-current bus is stabilized at the first preset voltage, controlling the hydrogen production bus to be merged into the direct-current bus; the second voltage of the merged hydrogen production bus reaches a second preset voltage value, and the second preset voltage value is smaller than the first preset voltage value; controlling at least one electrolytic cell to start; the current total power of the electrolytic cell is less than or equal to the sum of first preset power and energy storage unit rated power; and increasing the first preset power, updating the current total power of the electrolytic cells based on the first preset power, and returning to control the starting of at least one electrolytic cell until all electrolytic cells are started. According to the invention, black-start control of the micro-grid formed by the small-capacity energy storage system can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of black start control for a photovoltaic-hydrogen storage microgrid, and particularly to a black start control method, system, storage medium and product for a photovoltaic-hydrogen storage microgrid. Background Art

[0002] When a photovoltaic-hydrogen storage microgrid encounters an abnormal situation such as a sudden power outage, black start control can quickly restore the operation of the hydrogen production equipment in the microgrid, avoid the interruption of hydrogen production caused by the power outage, ensure the energy demand of specific hydrogen-using scenarios, and at the same time prevent equipment damage caused by a long-term power outage and reduce the operation risk. In the related art, black start generally only drives the power sources without black start capabilities through the power sources with black start capabilities inside the microgrid, and then gradually expands the restoration scope of the microgrid, and finally realizes the restart of the entire microgrid.

[0003] However, in a microgrid constructed based on a small-capacity energy storage system, due to the small capacity of the energy storage system, it is difficult to complete the black start control of the microgrid alone. Therefore, it is urgent to seek a black start control strategy applicable to a microgrid composed of a small-capacity energy storage system. Summary of the Invention

[0004] The main purpose of the present application is to provide a black start control method, system, storage medium and product for a photovoltaic-hydrogen storage microgrid, aiming to solve the technical problem that it is difficult for a small-capacity energy storage system to complete the black start control of the microgrid alone in the related art.

[0005] To achieve the above object, the present application proposes a black start control method for a photovoltaic-hydrogen storage microgrid, which can be used in a black start control system for a photovoltaic-hydrogen storage microgrid. The black start control system for a photovoltaic-hydrogen storage microgrid includes a photovoltaic unit, an energy storage unit and a hydrogen production unit that can be connected and disconnected to a DC bus; the hydrogen production unit includes a hydrogen production bus and at least one electrolyzer connected to the hydrogen production bus; The black start control method for a photovoltaic-hydrogen storage microgrid includes: Controlling the photovoltaic unit to be connected to the DC bus and controlling the photovoltaic unit to output a first preset power based on a power limit control method; wherein, the first voltage of the DC bus is pre-established by the energy storage unit and reaches a first preset voltage value; When the first voltage is stable at the first preset voltage value, controlling the hydrogen production bus to be connected to the DC bus; wherein, after the hydrogen production bus is connected to the DC bus, the second voltage of the hydrogen production bus reaches a second preset voltage value, and the second preset voltage value is less than the first preset voltage value; Controlling at least one electrolyzer to start; wherein, the total power of the current electrolyzers of at least one electrolyzer and the already started electrolyzers is less than or equal to the sum of the first preset power and the rated power of the energy storage unit; Increase the first preset power, update the current total electrolyzer power based on the first preset power, and return to execute the step of controlling the startup of at least one electrolyzer until all electrolyzers are started up.

[0006] In one embodiment, the step of controlling the startup of at least one electrolyzer includes: Determine the currently to-be-started electrolyzer in the order of increasing capacity of all unstarted electrolyzers. Control the currently to-be-started electrolyzer to start up.

[0007] In one embodiment, the first preset power is determined by calculation formula 1; Calculation formula 1 is: ; where is the first preset power, is the current total electrolyzer power, is the rated power of the energy storage unit.

[0008] In one embodiment, after the step of increasing the first preset power, updating the current total electrolyzer power based on the first preset power, and returning to execute the step of controlling the startup of at least one electrolyzer until all electrolyzers are started up, the method further includes: When the first preset power is less than the maximum power tracking value, control the first preset power output by the photovoltaic unit to increase to the maximum power tracking value so that the photovoltaic unit switches from the power limit control mode to the maximum power tracking control mode.

[0009] In addition, to achieve the above object, the present application also proposes a black start control method for a photovoltaic-hydrogen storage microgrid, which can be used in a black start control system for a photovoltaic-hydrogen storage microgrid. The black start control system for a photovoltaic-hydrogen storage microgrid includes a photovoltaic unit, an energy storage unit, and a hydrogen production unit that can be connected and disconnected to a DC bus; the hydrogen production unit includes a hydrogen production bus and at least one electrolyzer connected to the hydrogen production bus; The black start control method for a photovoltaic-hydrogen storage microgrid includes: Control the photovoltaic unit to be connected to the DC bus and placed in the standby state; where the first voltage of the DC bus is pre-established by the energy storage unit and reaches the first preset voltage value; Control the hydrogen production bus to be connected to the DC bus; where after the hydrogen production bus is connected to the DC bus, the second voltage of the hydrogen production bus reaches the second preset voltage value, and the second preset voltage value is less than the first preset voltage value; Determine the currently to-be-started electrolyzer from all unstarted electrolyzers; Control the startup of the currently to-be-started electrolytic cell, and after the currently to-be-started electrolytic cell is started, control the photovoltaic unit to output a second preset power based on a power limit control method, and return to execute the step of determining the currently to-be-started electrolytic cell from all unstarted electrolytic cells until all electrolytic cells are started; the second preset power is the total current electrolytic cell power of the currently to-be-started electrolytic cell and the started electrolytic cells.

[0010] In one embodiment, the step of determining the currently to-be-started electrolytic cell from all unstarted electrolytic cells includes: Determine the currently to-be-started electrolytic cell from all unstarted electrolytic cells in ascending order of capacity.

[0011] In addition, to achieve the above object, the present application also proposes a black start control system for a photovoltaic-hydrogen storage microgrid, and the black start control system for the photovoltaic-hydrogen storage microgrid includes: A photovoltaic unit, a energy storage unit, and a hydrogen production unit, all of which are connectable to and disconnectable from a DC bus; A control device, the control device is respectively connected to the photovoltaic unit, the energy storage unit, and the hydrogen production unit, the control device includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the computer program is configured to implement the steps of the black start control method for the photovoltaic-hydrogen storage microgrid as described above.

[0012] In one embodiment, the rated power of the energy storage unit is 5% - 15% of the total rated power of the hydrogen production unit.

[0013] In addition, to achieve the above object, the present application also proposes a storage medium, the storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium, and when the computer program is executed by a processor, it implements the steps of the black start control method for the photovoltaic-hydrogen storage microgrid as described above.

[0014] In addition, to achieve the above object, the present application also proposes a computer program product, the computer program product includes a computer program, and when the computer program is executed by a processor, it implements the steps of the black start control method for the photovoltaic-hydrogen storage microgrid as described above.

[0015] One or more technical solutions proposed by the present application have at least the following technical effects: In the black start control method of the photovoltaic-storage-hydrogen microgrid proposed in this application, the photovoltaic unit can be controlled to be connected to the DC bus and output the first preset power through the power limit control method; where the DC bus voltage is established in advance by the energy storage unit; then the hydrogen production bus is controlled to be connected to the DC bus, and the electrolyzer connected to the hydrogen production bus is gradually started; the gradual start of the electrolyzer can avoid the system overload caused by the one-time start of the hydrogen production unit. At the same time, with the start of the electrolyzer, the photovoltaic unit and the energy storage unit are coordinated to control the energy supply to ensure that the output of the photovoltaic unit can meet the start-up requirements of the electrolyzer in real time, so that the entire system can achieve the black start of the hydrogen production unit under the condition of a small-capacity energy storage system; or the photovoltaic unit can also be connected to the DC bus and placed in the standby state, and the DC bus voltage is also established in advance by the energy storage unit; then the hydrogen production bus is controlled to be connected to the DC bus, and the currently to-be-started electrolyzer is determined, and the total power of the currently to-be-started electrolyzer is determined as the second preset power to perform power limit control output on the photovoltaic unit. Thus, the output of the photovoltaic unit can meet the operation requirements of the currently to-be-started electrolyzer in real time, which not only solves the technical problem that a small-capacity energy storage system cannot complete the black start alone, but also reduces the complexity of the black start control process to a certain extent. Description of the Drawings

[0016] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with this application, and are used together with the specification to explain the principles of this application.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the following will briefly introduce the drawings required to be used in the description of the embodiments or related technologies. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic flowchart provided for the first embodiment of the black start control method of the photovoltaic-storage-hydrogen microgrid of this application; Figure 2 It is a schematic topological structure diagram of an example photovoltaic-storage-hydrogen microgrid black start control system; Figure 3 It is a schematic topological structure diagram of an example energy storage energy router; Figure 4 For Figure 3 The control schematic diagram of the energy storage energy router in Figure 5 It is a schematic topological structure diagram of an example photovoltaic energy router; Figure 6 For Figure 5 The control schematic diagram of the photovoltaic energy router in Figure 7 It is a schematic topological structure diagram of an example hydrogen production energy router; Figure 8 For Figure 7 the control schematic diagram of the hydrogen production energy router in the middle; Figure 9 It is a schematic flowchart provided by the second embodiment of the black start control method for the photovoltaic energy storage hydrogen microgrid in this application; Figure 10 It is the first brief flowchart of the black start control method for the photovoltaic energy storage hydrogen microgrid in this application; Figure 11 It is the second brief flowchart of the black start control method for the photovoltaic energy storage hydrogen microgrid in this application; Figure 12 It is the structural schematic diagram of the control device for the hardware operating environment involved in the black start control method of the photovoltaic energy storage hydrogen microgrid in the embodiments of this application.

[0019] The realization, functional characteristics and advantages of the purpose of this application will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0020] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of this application and are not used to limit this application.

[0021] In order to better understand the technical solutions of this application, the following will be described in detail with reference to the accompanying drawings of the specification and specific embodiments.

[0022] The main solution of the embodiments of this application is: controlling the photovoltaic unit to be incorporated into the DC bus, and controlling the photovoltaic unit to output the first preset power based on the power limit control method; wherein, the first voltage of the DC bus is pre-established by the energy storage unit and reaches the first preset voltage value; in the case where the first voltage is stable at the first preset voltage value, controlling the hydrogen production bus to be incorporated into the DC bus; wherein, after the hydrogen production bus is incorporated into the DC bus, the second voltage of the hydrogen production bus reaches the second preset voltage value, and the second preset voltage value is less than the first preset voltage value; controlling at least one electrolyzer to start; wherein, the total power of the current electrolyzers of at least one electrolyzer and the already started electrolyzers is less than or equal to the sum of the first preset power and the rated power of the energy storage unit; increasing the first preset power, and updating the total power of the current electrolyzers based on the first preset power, and returning to execute the step of controlling at least one electrolyzer to start until all electrolyzers are started.

[0023] The DC microgrid combines a solar photovoltaic power generation system, an energy storage system, an electrolytic water hydrogen production system, etc., to complete the consumption of new energy and the storage of hydrogen energy, providing a very potential solution for off-grid hydrogen production from renewable energy.

[0024] The off-grid hydrogen production system of the photovoltaic hydrogen storage DC microgrid is usually composed of a solar photovoltaic array, an energy storage device, a power electronic converter, and a water electrolysis hydrogen production device. In normal operation, the solar photovoltaic array converts solar energy into electrical energy. Part of the electrical energy is directly supplied to the hydrogen production equipment for water electrolysis hydrogen production, and the other part is stored in the energy storage device for use when there is insufficient light or the load demand changes. This system makes full use of the renewability of solar energy and the flexible adjustment ability of the energy storage system to achieve continuous and stable hydrogen production under off-grid conditions. However, when the system encounters a sudden power outage, such as equipment failure, bad weather causing photovoltaic module failure or energy storage system abnormality, how to achieve the black start of the off-grid hydrogen production system has become a difficult problem to be overcome. Black start is of great significance to the off-grid hydrogen production system of the photovoltaic hydrogen storage DC microgrid. Rapid restoration of the operation of the hydrogen production equipment can avoid the interruption of hydrogen production caused by power outages, ensure the energy demand of specific hydrogen use scenarios, and reduce economic losses. At the same time, a successful black start can maintain the stability of the system, prevent equipment damage caused by long-term power outages, and reduce system recovery costs and operating risks.

[0025] In related technologies, black start generally involves only using power sources with black start capability inside the microgrid to drive power sources without black start capability, and then gradually expanding the recovery range of the microgrid to eventually restart the entire microgrid. However, in a microgrid built on a small-capacity energy storage system, it is difficult to complete the black start control of the microgrid alone due to the small capacity of the energy storage system. Therefore, it is urgent to seek a black start control strategy that can be applied to a microgrid composed of a small-capacity energy storage system.

[0026] The present application provides a solution, which can control the photovoltaic unit to be connected to the DC bus and output a first preset power through a power limiting control method; wherein the DC bus voltage is pre-established by an energy storage unit; then the hydrogen production bus is controlled to be connected to the DC bus, and the electrolyzer connected to the hydrogen production bus is gradually started; the gradual start-up of the electrolyzer can avoid the system overload caused by the one-time start-up of the hydrogen production unit, and at the same time, with the start-up of the electrolyzer, the photovoltaic unit and the energy storage unit coordinately control the energy supply to ensure that the output of the photovoltaic unit can meet the start-up requirements of the electrolyzer in real time, so that the entire system can achieve the black start of the hydrogen production unit under the condition of a small-capacity energy storage system; or the photovoltaic unit can be connected to the DC bus and the photovoltaic unit is placed in a standby state, and the DC bus voltage is also pre-established by the energy storage unit; then the hydrogen production bus is controlled to be connected to the DC bus, and the electrolyzer to be started is determined, and the total power of the electrolyzer to be started is determined as the second preset power to limit the power output of the photovoltaic unit, so that the output of the photovoltaic unit can meet the operation requirements of the electrolyzer to be started in real time, which not only solves the technical problem that a small-capacity energy storage system cannot complete the black start alone, but also reduces the complexity of the black start control process to a certain extent.

[0027] It should be noted that the execution entity of this embodiment can be a computing service device with data processing, network communication, and program running functions, such as a tablet computer, a personal computer, etc., or an electronic device capable of implementing the above functions. Hereinafter, a control device is taken as an example to illustrate this embodiment and the following embodiments.

[0028] Based on this, an embodiment of the present application provides a black start control method for a photovoltaic-hydrogen storage microgrid, referring to Figure 1 , Figure 1 which is a schematic flowchart of Embodiment 1 of the black start control method for the photovoltaic-hydrogen storage microgrid of the present application.

[0029] In this embodiment, the black start control method for the photovoltaic-hydrogen storage microgrid includes steps S100 to S400: Step S100, control the photovoltaic unit to be connected to the DC bus, and control the photovoltaic unit to output a first preset power based on a power limit control method.

[0030] Among them, the first voltage of the DC bus is pre-established by the energy storage unit and reaches a first preset voltage value.

[0031] Step S200, when the first voltage is stable at the first preset voltage value, control the hydrogen production bus to be connected to the DC bus.

[0032] Among them, after the hydrogen production bus is connected to the DC bus, the second voltage of the hydrogen production bus reaches a second preset voltage value, and the second preset voltage value is less than the first preset voltage value.

[0033] Step S300, control at least one electrolyzer to start.

[0034] Among them, the total power of the current electrolyzers of at least one electrolyzer and the started electrolyzers is less than or equal to the sum of the first preset power and the rated power of the energy storage unit.

[0035] Step S400, increase the first preset power, update the total power of the current electrolyzers based on the first preset power, and return to execute the step of controlling at least one electrolyzer to start until all electrolyzers are started.

[0036] It should be noted that the black start control method of the photovoltaic-hydrogen storage microgrid in this embodiment is mainly used for the black start control system of a small-capacity photovoltaic-hydrogen storage microgrid. For the convenience of understanding, a schematic topological structure diagram of a photovoltaic-hydrogen storage microgrid black start control system of an example is given as Figure 2 shown, as Figure 2As shown, the black start control system of the photovoltaic-storage-hydrogen microgrid includes a 1MW photovoltaic unit, a 0.1MW energy storage unit, and a 1MW hydrogen production unit. The photovoltaic unit, the energy storage unit, and the hydrogen production unit are all connectable to a 1500V DC bus (hereinafter referred to as the 1500VDC bus). The hydrogen production unit may include a 625V DC hydrogen production bus (hereinafter referred to as the 625VDC bus) and at least one electrolyzer connected to the hydrogen production bus (such as Figure 2 the first alkaline electrolyzer AE1, the second alkaline electrolyzer AE2, the first proton exchange membrane electrolyzer PEM1, and the second proton exchange membrane electrolyzer PEM2 shown).

[0037] In the system of this example, the hydrogen production unit further includes a hydrogen production energy router. Each electrolyzer is connected to the hydrogen production bus through a corresponding Buck circuit and then connected to the DC bus through the hydrogen production energy router; the photovoltaic unit includes a 1300VDC photovoltaic array PV and a photovoltaic energy router, and PV is connected to the DC bus through the photovoltaic energy router; the energy storage unit includes a 768VDC energy storage power station BESS and an energy storage energy router, and BESS is connected to the DC bus through the energy storage energy router. Among them, both the photovoltaic energy router and the energy storage energy router adopt common topologies in engineering, which are composed of a resonant converter LLC and a Buck circuit, and can achieve efficient soft-switching isolation of "input-output" and full-range regulation of the voltage on the variable voltage output side. The hydrogen production energy router is composed of a boost circuit and an LLC. The control device can be connected to the photovoltaic energy router, the energy storage energy router, and the hydrogen production energy router respectively ( Figure 2 the control device is not drawn in the figure), to control the energy flow in the system, and the specific details can be seen in the following description.

[0038] The black start of a microgrid refers to the situation where, after the microgrid is shut down due to external or internal faults, without relying on the assistance of other power grids or microgrids, only through the power sources with black start capabilities within the microgrid, and then driving the power sources without black start capabilities within the microgrid, gradually expanding the scope of system restoration, and finally realizing the restart of the entire microgrid. However, in a photovoltaic-storage-hydrogen microgrid composed of small-capacity energy storage units of the above type, due to the small capacity of the energy storage unit, it is difficult to complete the black start of the system alone. Therefore, the hydrogen production unit can be started in cooperation with the photovoltaic unit; generally, the black start control method of this embodiment can be executed when the system fault has been eliminated and does not affect the restart of the system.

[0039] During the black start process, the photovoltaic unit can be controlled to be connected to the DC bus, and the output of the photovoltaic unit can be controlled to the first preset power based on the power limit control method; the first voltage of the DC bus is established by the energy storage unit before the photovoltaic unit is connected. In the system of the above example, the energy storage unit can establish a 1500VDC bus voltage through the voltage control of the energy storage energy router. After detecting that the 1500VDC bus voltage is in a stable state, the photovoltaic unit can be connected to the DC bus, and the output of the photovoltaic unit can be controlled to the first preset power through the power limit control method. As Figure 2 shown, in the energy storage energy router, the LLC operates at the resonant frequency point, which can achieve a fixed DC voltage conversion function. The 768VDC DC voltage on the output side of the energy storage voltage can be increased to 2497VDC DC voltage according to the voltage ratio of 615:2000. The Buck circuit of the energy storage energy router uses a double-loop control method of voltage outer loop and current inner loop to control the voltage stability of the 1500VDC DC bus.

[0040] Figure 3 It is a schematic diagram of the topology structure of the energy storage energy router; Figure 4 It is the control principle diagram of the energy storage energy router. As Figure 3 shown, the Buck circuit includes capacitor C BS1 , capacitor C BS2 , capacitor C BS3 , thyristor S BS1 , thyristor S BS2 , thyristor S BS3 , thyristor S BS4 and inductor L BS ; among them, the positive output terminal of the LLC in the energy storage energy router is respectively connected to one end of capacitor C BS1 and the drain of thyristor S BS1 . The source of thyristor S BS1 is respectively connected to the drain of thyristor S BS2 and one end of inductor L BS . The other end of inductor L BS is connected to one end of capacitor C BS3 . The other end of capacitor C BS1 is respectively connected to one end of capacitor C BS2 , the source of thyristor S BS2 and the drain of thyristor S BS3 . The source of thyristor S BS3 is respectively connected to the drain of thyristor S BS4 and the other end of capacitor C BS3 . The other end of capacitor C BS2 is connected to the source of thyristor S BS4 . The other end of capacitor C BS3Both ends are connected to the 1500VDC bus; the energy storage unit can adopt a double-loop control method of voltage outer loop and current inner loop based on this structure to maintain the voltage stability of the 1500VDC DC bus. As Figure 4 shown, the real-time voltage of the DC bus , and the given standard voltage of 1500V are input to the PI regulator to obtain the converted current signal, and this current signal is input to the limiter (for current limiting to prevent overcurrent; where the maximum limit value is , and the minimum limit value is ) to obtain the given current . The given current and the current BS flowing through the inductor L are input to the PI regulator to obtain the duty cycle control signal , which is used for the control of thyristors S BS1 ~S BS4 (to achieve the voltage equalization control of the Buck circuit). The voltage BS1 across the capacitor C and the voltage BS2 across the capacitor C are subjected to a difference operation and input to the PI regulator, and then the current flow direction at the positive output end of LLC is judged (A>B=-1 indicates that the current flows out of LLC; A<B=1 indicates that the current flows into LLC). According to the current flow direction, the signal output by the PI regulator, and the duty cycle signal , the carrier 1 and carrier 2 are respectively superimposed, and the gate control signals S1_BS~S4_BS corresponding to the thyristors S BS1 ~S BS4 can be comprehensively determined; through the control method as Figure 4 shown, the stable voltage control of the 1500VDC bus can be achieved.

[0041] After the photovoltaic unit is incorporated into the 1500VDC bus, power limit control can be performed through the photovoltaic energy router. As Figure 2 shown, in the photovoltaic energy router, LLC can operate at the resonant frequency point, and the 1300VDC DC voltage on the output side of the photovoltaic array is increased to approximately 2113VDC DC voltage according to the turns ratio of 615:1000; the Buck circuit is used to achieve the maximum power tracking control of the photovoltaic array (to output the maximum power generated by the photovoltaic array) and the power limit control method (to control the photovoltaic system to output the first preset power). Figure 5 is the topological structure schematic diagram of the photovoltaic energy router, Figure 6 is the control principle diagram of the photovoltaic energy router, Figure 5 the Buck circuit structure in the photovoltaic energy router is the same asFigure 3 The structure of the energy router in the medium energy storage is the same as that described above, which can be referred to the previous description and will not be elaborated here. As Figure 6 shown, the voltage and current output by the photovoltaic array are input to the MPPT (Maximum Power Point Tracking) module to obtain the theoretically output voltage of the photovoltaic array. The voltage and the actual voltage are input to the PI regulator to obtain the corresponding output current signal. At the same time, the first preset power can be input to the converter (K is the conversion coefficient), and the corresponding current value can be obtained through conversion, and this corresponding current value is used as the maximum current limit value . At the same time, the minimum current limit value is taken as 0 to limit the aforementioned current signal output by the PI regulator to obtain the given reference current PV corresponding to the inductor L . The given current and the current PV flowing through the inductor L are input to the PI regulator to obtain the duty cycle control signal , which is used for the control of thyristors S PV1 ~S PV4 (the control logic is the same as Figure 3 , which can be referred to the previous description and will not be elaborated here. In the subscript description of each parameter symbol in Figure 5 - 6 , pv represents the photovoltaic unit).

[0042] It should be noted that when setting the first preset power, considering the limitation of the energy storage system capacity, the first preset power can be determined by calculation formula 1; calculation formula 1 is: ; where is the first preset power, is the total power of the current electrolyzer, is the rated power of the energy storage unit. The total power of the current electrolyzer is the total power of the electrolyzers connected to the system and in the starting state. When the photovoltaic unit is first connected, since the hydrogen production unit has not been connected at this time, when setting the first preset power for the first time, the corresponding is 0; that is, when initially setting the first preset power, it only needs to satisfy that the first preset power is less than or equal to the rated power of the energy storage unit; this limiting condition enables the energy storage unit to fully meet the operation requirements of the photovoltaic unit and avoid the failure of black start; and in order to achieve a faster start of the system, the above calculation formula 1 can take the equal sign, that is, the setting condition of the first preset power is .

[0043] Based on Figure 6 the shown control schematic diagram, the photovoltaic unit can output the first preset power , when the photovoltaic unit is put into operation and outputs the first preset power, and the first voltage is stabilized at the first preset voltage value, the hydrogen production bus can be controlled to be incorporated into the DC bus; as Figure 2 shown, the hydrogen production energy router can be connected to the 1500VDC bus to incorporate the hydrogen production bus into the DC bus; after the hydrogen production bus is incorporated into the DC bus, the second voltage of the hydrogen production bus (i.e., the 625VDC bus voltage) can be established through the hydrogen production energy router; as Figure 2 shown, in the hydrogen production energy router, LLC also operates at the resonance frequency point to achieve a fixed DC voltage conversion function, and the 625VDC DC bus voltage can be increased to 2032VDC DC voltage according to the turns ratio of 615:2000, and the Boost circuit is used to control the voltage stability of the 625VDC bus through the double-loop control method of voltage outer loop and current inner loop. Figure 7 is the schematic diagram of the topology structure of the hydrogen production energy router, Figure 8 is the control schematic diagram of the hydrogen production energy router; Figure 7 The topology structure of the shown hydrogen production energy router is essentially similar to Figure 3 that of the energy storage energy router, and is symmetrical with the topology structure of Figure 3 the shown energy storage energy router, Figure 8 and the shown control method is also the same as the control principle Figure 4 shown in Figure 1 , so the relevant description in the previous text Figure 3 - 4 can be referred to, and will not be elaborated here ( Figure 7 - 8 in the subscript description of each parameter symbol, HY represents the hydrogen production unit). After the hydrogen production unit is connected to the 1500VDC bus, the second voltage of the hydrogen production bus can reach the second preset voltage value through the control method Figure 8 shown, and the second preset voltage value is less than the first preset voltage value; in the above example, the second preset voltage value is 625V and the first preset voltage value is 1500V.

[0044] After the energy storage unit is incorporated into the DC bus, after it is monitored that the voltage of the hydrogen production bus is in a stable state, at least one electrolyzer can be controlled to start; wherein, the total current electrolyzer power of at least one electrolyzer and the already started electrolyzers is less than or equal to the sum of the first preset power and the rated power of the energy storage unit. It is not difficult to understand that when the photovoltaic unit is incorporated, the energy generated by the photovoltaic unit and the energy storage unit can jointly supply energy to the hydrogen production unit. Therefore, in order to avoid exceeding the energy support that the system can provide when all the electrolyzers in the hydrogen production unit are started, the total current electrolyzer power that the system can support can be determined according to the first preset power and the rated power of the energy storage unit under the current operating state; the total current electrolyzer power refers to the total power of the electrolyzers controlled to start this time (i.e., the above-mentioned at least one electrolyzer) and the already started electrolyzers before this (when starting the electrolyzers for the first time, the number of already started electrolyzers is 0). Thus, the total current electrolyzer power ≤ the first preset power + the rated power of the energy storage unit; and in order to achieve a faster start of the system, the total current electrolyzer power can be equal to the sum of the first preset power and the rated power of the energy storage unit.

[0045] In a feasible implementation manner, the step of controlling at least one electrolyzer to start may include: determining the currently to-be-started electrolyzer in the order of increasing capacity of all the unstarted electrolyzers; controlling the currently to-be-started electrolyzer to start. It can be understood that when there are multiple unstarted electrolyzers in the system, in order to avoid the electrolyzers in the hydrogen production unit starting simultaneously, causing the system to suddenly bear a large power load, resulting in overload or voltage collapse; the capacities of all the unstarted electrolyzers can be arranged in the order of increasing size, and then the currently to-be-started electrolyzer that satisfies the condition of "the total current electrolyzer power ≤ the first preset power + the rated power of the energy storage unit" can be selected from them and controlled to start. For example, as Figure 2 shown, there are four electrolyzers in the system: AE1, AE2, PEM1, and PEM2, and their capacity sizes are AE1 < AE2 < PEM1 < PEM2; if the sum of the corresponding first preset power (0.1 MW) and the rated power of the energy storage unit (0.1 MW) is 0.2 MW at this time, and if the sum of the capacities of AE1, AE2, and PEM1 is greater than 0.2 MW, and the sum of the capacities of AE1 and AE2 is less than or equal to 0.2 MW, then AE1 and AE2 are determined as the currently to-be-started electrolyzers, and AE1 and AE2 are controlled to start, and then the subsequent start control is continued.

[0046] If the electrolyzer has not been fully started, when it is monitored that the first voltage is stable at the first preset voltage value and the second voltage is also stable at the second preset voltage value, the first preset power can be continuously increased, and the first preset power after the increased output of the photovoltaic unit can be obtained through power limit control. It should be noted that in practical applications, the increment of the first preset power can be twice the rated power of the energy storage unit, and the increased first preset power should still satisfy the aforementioned calculation formula (1). After the photovoltaic unit increases its power output, the system can support more electrolyzers to be connected. Therefore, the corresponding current total power of the electrolyzers can be updated according to the first preset power to determine the current electrolyzer to be started this time. Continuing with the previous example, during the first start, AE1 and AE2 are started. The first preset power of the photovoltaic unit after increasing by twice the rated power of the energy storage unit is 0.3 MW. At this time, the sum of the first preset power and the rated power of the energy storage unit is 0.4 MW. If the sum of the capacities of AE1, AE2 (AE1 and AE2 have been started) and PEM1 is less than or equal to 0.4 MW, and the sum of the capacities of AE1, AE2, PEM1 and PEM2 is greater than 0.4 MW, then PEM1 is determined as the current electrolyzer to be started, and PEM1 is controlled to start. Then, the first preset power output by the photovoltaic unit is continuously increased until all the electrolyzers of the hydrogen production unit are started to complete the black start of the entire system.

[0047] In addition, after the system completes the black start, in order to keep the power output of the photovoltaic unit always at the maximum power point to improve the energy utilization efficiency, it can also be determined whether the corresponding first preset power is greater than the maximum power tracking value at this time; when the first preset power is less than the maximum power tracking value, it indicates that the photovoltaic unit has not reached the maximum power point at this time. At this time, the first preset power output by the photovoltaic unit can be controlled to increase to the maximum power tracking value, so that the photovoltaic unit switches from the power limit control mode to the maximum power tracking control mode to improve the energy utilization efficiency of the photovoltaic unit. If the first preset power is greater than or equal to the maximum power tracking value, it indicates that during the black start process, the photovoltaic unit has realized the switch from the power limit control mode to the MPPT control mode, and there is no need to continue increasing the first preset power.

[0048] It can be understood that the black start control method for the photovoltaic energy storage hydrogen microgrid provided in the first embodiment of the present application can control the photovoltaic unit to be connected to the DC bus and output a first preset power through a power limit control method; wherein the DC bus voltage is pre-established by the energy storage unit; then control the hydrogen production bus to be connected to the DC bus and gradually start the electrolyzer connected to the hydrogen production bus; the gradual start of the electrolyzer can avoid the system overload caused by the one-time start of the hydrogen production unit and ensure the black start stability of the system; at the same time, with the start of the electrolyzer, the photovoltaic unit and the energy storage unit cooperate to control the energy supply to ensure that the output of the photovoltaic unit can meet the start-up requirements of the electrolyzer in real time, so that the entire system can achieve relatively stable black start control under the condition of a small-capacity energy storage system.

[0049] Based on the first embodiment of the present application, the present application also proposes a second embodiment. For the same or similar content in the second embodiment as in the above first embodiment, reference can be made to the above introduction and will not be repeated hereinafter. On this basis, please refer to Figure 9 , in this embodiment, the black start control method for the photovoltaic energy storage hydrogen microgrid may include steps A100 to A400: Step A100, control the photovoltaic unit to be connected to the DC bus and placed in a standby state.

[0050] Wherein, the first voltage of the DC bus is pre-established by the energy storage unit and reaches a first preset voltage value.

[0051] Step A200, control the hydrogen production bus to be connected to the DC bus.

[0052] Wherein, after the hydrogen production bus is connected to the DC bus, the second voltage of the hydrogen production bus reaches a second preset voltage value, and the second preset voltage value is less than the first preset voltage value.

[0053] Step A300, determine the currently to-be-started electrolyzer from all the un-started electrolyzers.

[0054] Step A400, control the currently to-be-started electrolyzer to start, and after the currently to-be-started electrolyzer starts, control the photovoltaic unit to output a second preset power based on a power limit control method, and return to execute the step of determining the currently to-be-started electrolyzer from all the un-started electrolyzers until all the electrolyzers are started.

[0055] Wherein, the second preset power is the total current electrolyzer power of the currently to-be-started electrolyzer and the already-started electrolyzers.

[0056] Specifically, similar to the black-start control method of the photovoltaic-hydrogen storage microgrid provided in the first embodiment, during the black-start process, the photovoltaic unit can be first controlled to be connected to the DC bus and placed in a standby state. That is, at this time, only the photovoltaic unit is connected to the DC bus, but the photovoltaic unit does not output power. At this time, the first voltage of the DC bus is also established by the energy storage unit before the photovoltaic unit is connected. During the black-start process, real-time voltage control is performed on the energy storage unit so that the first voltage of the DC bus can be stabilized at a first preset voltage value. For the specific control, reference can be made to the description in the first embodiment, which will not be elaborated here.

[0057] When the voltage of the DC bus is stable, then control the hydrogen production bus to be connected to the DC bus. Among them, after the hydrogen production bus is connected to the DC bus, the second voltage of the hydrogen production bus reaches a second preset voltage value, and the second preset voltage value is less than the first preset voltage value. Similarly, the hydrogen production bus can be connected to the DC bus through the hydrogen production energy router. At the same time, through the voltage control of the hydrogen production energy router, the hydrogen production bus voltage (i.e., the second voltage) of the hydrogen production unit can be stabilized at the second preset voltage value. When the bus voltages are all in a stable state, the currently to-be-started electrolyzer can be determined from all the unstarted electrolyzers. In a feasible implementation manner, the currently to-be-started electrolyzer can be determined from all the unstarted electrolyzers in the order of increasing capacity; then control the currently to-be-started electrolyzer to start, and when starting the currently to-be-started electrolyzer, control the photovoltaic unit to output a second preset power based on a power limit control method (the specific control process can refer to the content of the first embodiment); the limited power of the photovoltaic unit (i.e., the second preset power) is the total power of the determined currently to-be-started electrolyzer; then return to execute the step of determining the currently to-be-started electrolyzer from all the unstarted electrolyzers until all the electrolyzers are started.

[0058] For example, there are four electrolyzers in the current system (all unstarted): AE1, AE2, PEM1, and PEM2, and their capacities are AE1 < AE2 < PEM1 < PEM2; when starting the electrolyzers for the first time, the number of started electrolyzers is 0, and the AE1 with the smallest capacity is used as the currently to-be-started electrolyzer. At this time, the total power of the current electrolyzer is the power of AE1, and the power of AE1 is used as the second preset power for the power limit control of the photovoltaic unit; then return to continue starting the electrolyzers. Since AE1 has been started, at this time, the AE2 with the smallest capacity among the unstarted electrolyzers can be determined as the to-be-started electrolyzer. At this time, the corresponding total power of the current electrolyzer That is, it is the sum of the powers of AE1 and AE2. At the same time, the second preset power of the photovoltaic unit's power limit control is also adjusted to the sum of the powers of AE1 and AE2 to achieve the simultaneous operation of the photovoltaic unit and the AE1 and AE2 electrolyzers. Then, repeat the above steps until all unstarted electrolyzers in the system are started. In this black start control method, the photovoltaic unit and the hydrogen production unit are put into operation simultaneously. The power output of the photovoltaic unit can meet the start-up and operation requirements of the electrolyzer in real time, while the energy storage unit is mainly used to stabilize the bus voltage fluctuation caused by small power mismatch and is not used as the energy supply for the hydrogen production unit.

[0059] Similarly, after completing the black start control, it is also possible to determine whether the second preset power of the final photovoltaic unit's power limit control reaches the maximum power tracking value. If not, increase the second preset power output by the photovoltaic unit to the maximum power tracking value to achieve the switching of the power limit control mode of the photovoltaic unit to the maximum power tracking control mode and improve the energy utilization efficiency of the photovoltaic unit.

[0060] It is not difficult to understand that the black start control method for the photovoltaic-hydrogen storage microgrid provided in this embodiment can connect the photovoltaic unit to the DC bus and put the photovoltaic unit in the standby state. The DC bus voltage is also established in advance through the energy storage unit. Then, control the hydrogen production bus to be incorporated into the DC bus, determine the currently to-be-started electrolyzer, and determine the total power of the currently to-be-started electrolyzer as the second preset power to perform power limit control output on the photovoltaic unit. Thus, the output of the photovoltaic unit can meet the operation requirements of the currently to-be-started electrolyzer in real time, not only solving the technical problem that a small-capacity energy storage system cannot complete the black start alone, but also only needing to synchronously control the output power of the photovoltaic unit according to the electrolyzer power during control, which can reduce the complexity of the black start control process.

[0061] Exemplarily, to help understand the implementation process of the black start control method for the photovoltaic-hydrogen storage microgrid provided in this application, please refer to Figure 10 - Figure 11 . Figure 10 and Figure 11 For Figure 2 the schematic diagram of the brief process of the black start control method adopted for the photovoltaic-hydrogen storage microgrid structure shown. Figure 10 A first schematic diagram of the brief process of the black start control method for the photovoltaic-hydrogen storage microgrid is provided. Specifically: Figure 10 The schematic diagram of the brief process shown mainly adopts the black start control method for the photovoltaic-hydrogen storage microgrid in Embodiment 1. In this example, the setting conditions for the first preset power are: ; the determination condition for the total power of the current electrolyzer is . As Figure 7As shown, when the system is in the initial black-start condition, the energy storage unit first establishes a 1500 VDC bus voltage through the voltage control of the energy storage energy router. After detecting that the 1500 VDC bus voltage is stable, the photovoltaic unit is connected to the 1500 VDC bus and outputs a set first preset power through a power limiting control strategy. ; After the photovoltaic unit outputs at the first preset power, it is detected whether the 1500 VDC bus voltage is stable. If it is stable, the hydrogen production energy router is connected to the 1500 VDV bus, and a 625 VDC bus voltage is established through the hydrogen production energy router; if it is detected that the 625 VDC bus voltage is stable, according to the determined current total electrolyzer power ( ), the electrolyzers are connected to the 625 VDC bus in ascending order of capacity; after detecting that the 1500 VDC bus and the 625 VDC bus voltages are stable, the above steps of controlling the photovoltaic unit to output the first preset power are repeated until all electrolyzers are started, and thus the system black start is completed.

[0062] Figure 11 A second schematic flowchart of a black start control method for a photovoltaic-hydrogen storage microgrid is provided; Figure 11 The shown schematic flowchart mainly adopts the black start control method of the photovoltaic-hydrogen storage microgrid in Embodiment 2. As Figure 11 shown, when the system is in the initial black-start condition, the energy storage unit first establishes a 1500 VDC bus voltage through the voltage control of the energy storage energy router; after detecting that the 1500 VDC bus voltage is stable, the photovoltaic unit is connected to the 1500 VDC bus and is in a standby state; then the hydrogen production energy router is connected to the 1500 VDC bus, and the establishment of the 625 VDC bus voltage is completed; after detecting that the 625 VDC bus voltage is stable, multiple electrolyzers are connected to the 625 VDC bus in ascending order of capacity (see part of Embodiment 2), and the current total electrolyzer power is used as the second preset power for the power limiting control of the photovoltaic unit (i.e., ), and in this way, the photovoltaic unit is started to output power until all electrolyzers are started. In this method, the energy storage unit is mainly used to stabilize the DC bus voltage fluctuation caused by small power mismatch during the black start process, and the energy consumed by the hydrogen production unit will mainly be provided by the photovoltaic unit.

[0063] It should be noted that the above examples are only for understanding the present application and do not constitute a limitation on the black start control method of the photovoltaic-hydrogen storage microgrid of the present application. Based on this technical concept, more forms of simple transformation are within the protection scope of the present application.

[0064] The present application also provides a black start control system for a photovoltaic-hydrogen storage microgrid. The black start control system for the photovoltaic-hydrogen storage microgrid may include a photovoltaic unit, a energy storage unit, a hydrogen production unit, and a control device. Among them, the photovoltaic unit, the energy storage unit, and the hydrogen production unit are all connectable and disconnectable to the DC bus, and the control device is respectively connected to the photovoltaic unit, the energy storage unit, and the hydrogen production unit.

[0065] The connection relationships among the above-mentioned photovoltaic unit, energy storage unit, and hydrogen production unit can be referred to the Figure 2 topological structure diagram shown as follows, which will not be elaborated here. The control device is respectively connected to the photovoltaic unit, the energy storage unit, and the hydrogen production unit, and can be used to control each unit. In the system shown as Figure 2 follows, the control device can be respectively connected to an energy storage energy router, a photovoltaic energy router, and a hydrogen production energy router to execute the black start control method for the photovoltaic-hydrogen storage microgrid provided in the above embodiments. In a feasible implementation manner, the rated power of the energy storage unit is 5% - 15% of the total rated power of the hydrogen production unit; preferably, the rated power of the energy storage unit can be 1 / 10 of that of the hydrogen production unit.

[0066] In this embodiment, the control device may include at least one processor; and a memory communicatively connected to the at least one processor. Among them, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the black start control method for the photovoltaic-hydrogen storage microgrid in the embodiments described hereinafter.

[0067] Next, refer to Figure 12 which shows a schematic structural diagram of a control device suitable for implementing the embodiments of the present application. The control device in the embodiments of the present application may include, but is not limited to, mobile terminals such as laptop computers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), etc., and fixed terminals such as desktop computers, etc. Figure 12 The control device shown is only an example and should not impose any limitation on the functions and usage scope of the embodiments of the present application.

[0068] As Figure 12As shown in the figure, the control device may include a processing device 1001 (such as a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM: Read Only Memory) 1002 or the program loaded from the storage device 1003 into the random access memory (RAM: Random Access Memory) 1004. In the RAM 1004, various programs and data required for the operation of the control device are also stored. The processing device 1001, the ROM 1002, and the RAM 1004 are connected to each other through a bus 1005. The input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the control device to communicate with other devices wirelessly or wiredly to exchange data. Although the figure shows a control device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be alternatively implemented or had.

[0069] The optical storage hydrogen microgrid black start control system provided by this application adopts the optical storage hydrogen microgrid black start control method in the above-mentioned embodiment, and can solve the technical problem that it is difficult for the energy storage system with a small capacity to complete the microgrid black start control alone in the related technology. Compared with the related technology, the beneficial effects of the optical storage hydrogen microgrid black start control system provided by this application are the same as those of the optical storage hydrogen microgrid black start control method provided by the above-mentioned embodiment, and other technical features in this optical storage hydrogen microgrid black start control system are the same as the features disclosed in the method embodiment, and will not be elaborated here.

[0070] It should be understood that each part disclosed in this application can be implemented by hardware, software, firmware or a combination of them. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0071] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all of them should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0072] The present application provides a computer-readable storage medium having computer-readable program instructions (i.e., computer programs) stored thereon, and the computer-readable program instructions are used to execute the optical storage hydrogen microgrid black start control method in the above embodiments.

[0073] The computer-readable storage medium provided by the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems or devices, or any combination of the above. More specific examples of the computer-readable storage medium may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM) or flash memory, optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium that contains or stores a program, and the program can be used by or in conjunction with an instruction execution system or device. The program code contained on the computer-readable storage medium can be transmitted by any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0074] The above computer-readable storage medium may be included in the control device; or it may exist separately without being assembled into the control device.

[0075] The above computer-readable storage medium carries one or more programs. When the one or more programs are executed by the control device, the control device is caused to: control the photovoltaic unit to be connected to the DC bus and control the photovoltaic unit to output a first preset power based on a power limit control method; wherein, the first voltage of the DC bus is pre-established by the energy storage unit and reaches a first preset voltage value; in the case where the first voltage is stabilized at the first preset voltage value, control the hydrogen production bus to be connected to the DC bus; wherein, after the hydrogen production bus is connected to the DC bus, the second voltage of the hydrogen production bus reaches a second preset voltage value, and the second preset voltage value is less than the first preset voltage value; control at least one electrolyzer to start; wherein, the total power of at least one electrolyzer and the currently started electrolyzers is less than or equal to the sum of the first preset power and the rated power of the energy storage unit; increase the first preset power, and update the total power of the currently started electrolyzers based on the first preset power, and return to execute the step of controlling at least one electrolyzer to start until all electrolyzers are started.

[0076] Computer program code for performing the operations of this application can be written in one or more programming languages or combinations thereof. The above-mentioned programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any kind of network, including a local area network (LAN: Local Area Network) or a wide area network (WAN: Wide Area Network), or it can be connected to an external computer (for example, by using an Internet service provider to connect through the Internet).

[0077] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutively represented blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0078] The modules described in the embodiments of this application can be implemented in software or in hardware. Among them, the name of the module does not constitute a limitation on the unit itself in some cases.

[0079] The readable storage medium provided by this application is a computer-readable storage medium. The computer-readable storage medium stores computer-readable program instructions (i.e., computer programs) for performing the above-mentioned optical hydrogen storage microgrid black start control method, and can solve the technical problem that the energy storage system has a small capacity and is difficult to complete the microgrid black start control alone. Compared with the related technology, the beneficial effects of the computer-readable storage medium provided by this application are the same as those of the optical hydrogen storage microgrid black start control method provided by the above embodiments, and will not be elaborated here.

[0080] The present application also provides a computer program product, including a computer program, which when executed by a processor implements the steps of the above-mentioned black start control method for a photovoltaic-hydrogen storage microgrid.

[0081] The computer program product provided by the present application can solve the technical problem in the related art that it is difficult for a small-capacity energy storage system to complete the black start control of a microgrid alone. Compared with the related art, the beneficial effects of the computer program product provided by the present application are the same as those of the black start control method for a photovoltaic-hydrogen storage microgrid provided in the above embodiments, and will not be elaborated here.

[0082] The above are only partial embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structural transformation made under the technical concept of the present application by using the content of the specification and drawings of the present application, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A black-start control method for a photovoltaic energy storage hydrogen microgrid, characterized in that, For a black-start control system of a photovoltaic energy storage and hydrogen production microgrid, the black-start control system of the photovoltaic energy storage and hydrogen production microgrid includes a photovoltaic unit, an energy storage unit, and a hydrogen production unit that can be connected to and disconnected from a DC bus; the hydrogen production unit includes a hydrogen production bus and at least one electrolyzer connected to the hydrogen production bus; The black-start control method for the photovoltaic energy storage and hydrogen production microgrid includes: Controlling the photovoltaic unit to be connected to the DC bus and controlling the photovoltaic unit to output a first preset power based on a power limit control method; wherein, the first voltage of the DC bus is pre-established by the energy storage unit and reaches a first preset voltage value; When the first voltage is stabilized at the first preset voltage value, controlling the hydrogen production bus to be connected to the DC bus; wherein, after the hydrogen production bus is connected to the DC bus, the second voltage of the hydrogen production bus reaches a second preset voltage value, and the second preset voltage value is less than the first preset voltage value; Controlling at least one electrolyzer to start; wherein, the total power of at least one electrolyzer and the currently started electrolyzers is less than or equal to the sum of the first preset power and the rated power of the energy storage unit; Increasing the first preset power, updating the total power of the currently started electrolyzers based on the first preset power, and returning to execute the step of controlling at least one electrolyzer to start until all the electrolyzers are started.

2. The black start control method for the optical storage hydrogen microgrid according to claim 1, wherein The step of controlling at least one electrolyzer to start includes: Determining the currently to-be-started electrolyzer in ascending order of the capacities of all the unstarted electrolyzers; Controlling the currently to-be-started electrolyzer to start.

3. The black start control method for the optical storage hydrogen microgrid according to claim 1, characterized in that, The first preset power is determined by calculation formula one; Calculation formula one is as follows: ; where is the first preset power, is the total power of the current electrolytic cell, is the rated power of the energy storage unit.

4. The black-start control method for the optical storage hydrogen microgrid according to any one of claims 1 to 3, characterized in that, After the step of increasing the first preset power, updating the total power of the currently started electrolyzers based on the first preset power, and returning to execute the step of controlling at least one electrolyzer to start until all the electrolyzers are started, the method further includes: When the first preset power is less than the maximum power tracking value, controlling the first preset power output by the photovoltaic unit to increase to the maximum power tracking value so that the photovoltaic unit switches from the power limit control method to the maximum power tracking control method.

5. A black start control method for a photovoltaic energy storage and hydrogen production microgrid, characterized in that, For a black-start control system of a photovoltaic energy storage and hydrogen production microgrid, the black-start control system of the photovoltaic energy storage and hydrogen production microgrid includes a photovoltaic unit, an energy storage unit, and a hydrogen production unit that can be connected to and disconnected from a DC bus; the hydrogen production unit includes a hydrogen production bus and at least one electrolyzer connected to the hydrogen production bus; The black-start control method for the photovoltaic energy storage and hydrogen production microgrid includes: Controlling the photovoltaic unit to be connected to the DC bus and placed in a standby state; wherein, the first voltage of the DC bus is pre-established by the energy storage unit and reaches a first preset voltage value; Controlling the hydrogen production bus to be connected to the DC bus; wherein, after the hydrogen production bus is connected to the DC bus, the second voltage of the hydrogen production bus reaches a second preset voltage value, and the second preset voltage value is less than the first preset voltage value; Determining the currently to-be-started electrolyzer from all the unstarted electrolyzers; Control the startup of the currently to-be-started electrolyzer, and after the currently to-be-started electrolyzer is started, control the photovoltaic unit to output a second preset power based on a limited power control method, and return to execute the step of determining the currently to-be-started electrolyzer from all unstarted electrolyzers until all electrolyzers are started; the second preset power is the total power of the currently to-be-started electrolyzer and the started electrolyzers.

6. The black start control method for the photovoltaic energy storage hydrogen microgrid according to claim 5, characterized in that The step of determining the currently to-be-started electrolyzer from all unstarted electrolyzers includes: Determine the currently to-be-started electrolyzer from all unstarted electrolyzers in ascending order of capacity.

7. A black start control system for a photovoltaic energy storage and hydrogen production microgrid, characterized in that, The black start control system of the photovoltaic-storage-hydrogen microgrid includes: A photovoltaic unit, a storage unit, and a hydrogen production unit, all of which are connectable to and disconnectable from a DC bus; A control device, the control device is respectively connected to the photovoltaic unit, the storage unit, and the hydrogen production unit, the control device includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the computer program is configured to implement the steps of the black start control method of the photovoltaic-storage-hydrogen microgrid as described in any one of claims 1 to 6.

8. The black start control system of the optical storage hydrogen microgrid according to claim 7, characterized in that, The rated power of the storage unit is 5% to 15% of the total rated power of the hydrogen production unit.

9. A storage medium, characterized in that The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium, and when the computer program is executed by a processor, it implements the steps of the black start control method of the photovoltaic-storage-hydrogen microgrid as described in any one of claims 1 to 6.

10. A computer program product, characterized in that, The computer program product includes a computer program, and when the computer program is executed by a processor, it implements the steps of the black start control method of the photovoltaic-storage-hydrogen microgrid as described in any one of claims 1 to 6.

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