A method for integrated energy management of light hydrogen storage

Abstract

The application discloses a kind of light hydrogen storage integration energy management methods, it is related to light hydrogen storage energy management technical field, comprising: light hydrogen storage system according to the parameter value of light hydrogen storage energy management platform's working mode mark E_mode Switching working mode, wherein, when E_mode=1, light hydrogen storage energy management platform starts running energy management function, switches to dispatch mode;When E_mode=0, light hydrogen storage energy management platform stops running energy management function, switches to self-sustaining mode;Light hydrogen storage system is according to the working mode of switching boost voltage-boosting circuit and two-way buck / boost circuit for hydrogen production unit power supply, wherein: when working mode is dispatch mode, light hydrogen storage system balances internal power flow according to the energy scheduling instruction of light hydrogen storage energy management platform;When working mode is self-sustaining mode, light hydrogen storage system automatically balances internal power flow.The beneficial effects of the present application: realize the centralized control of energy interaction between photovoltaic, energy storage and hydrogen production unit, so as to optimize energy utilization efficiency.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic hydrogen storage energy management technology, and more specifically, to an integrated photovoltaic hydrogen storage energy management method. Background Technology

[0002] Photovoltaic hydrogen storage systems are a new type of energy system integrating photovoltaic power generation, energy storage, and hydrogen production. They fully utilize photovoltaic power generation to produce hydrogen, achieving efficient energy storage and conversion, and then use the hydrogen to generate electricity or directly power loads when needed. This system has significant potential in improving the absorption capacity of renewable energy, achieving grid peak shaving, and promoting the decarbonization of energy. In recent years, with the rapid development of photovoltaic, energy storage, and hydrogen energy technologies, the research and application of photovoltaic hydrogen storage systems have gradually attracted attention.

[0003] In existing technologies, energy management of photovoltaic-hydrogen storage systems mainly relies on traditional energy management systems. These systems monitor and regulate the operating status of photovoltaic power generation, energy storage units, and hydrogen production equipment to achieve energy flow balance. Regarding voltage and power regulation, existing systems often use independent converters to control the voltage and power output of the photovoltaic, energy storage, and hydrogen production equipment separately. This decentralized control approach makes it difficult to achieve optimized overall system operation, resulting in low energy utilization efficiency.

[0004] Therefore, this invention provides an integrated photovoltaic-hydrogen storage energy management method, which enables centralized control of energy interaction between photovoltaic, energy storage and hydrogen production units, thereby optimizing energy utilization efficiency. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides an integrated photovoltaic-hydrogen storage energy management method, which enables centralized control of energy interaction between photovoltaic, energy storage and hydrogen production units, thereby optimizing energy utilization efficiency.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a photovoltaic-hydrogen storage integrated energy management method, applied to a photovoltaic-hydrogen storage integrated energy management system, wherein the improvement is that the photovoltaic-hydrogen storage integrated energy management system includes a photovoltaic-hydrogen storage energy management platform and a photovoltaic-hydrogen storage system, and the photovoltaic-hydrogen storage energy management platform is connected to the photovoltaic-hydrogen storage system.

[0007] The photovoltaic hydrogen storage system includes a boost circuit, a bidirectional buck / boost circuit, a DC high-voltage bus, and a hydrogen production unit; the boost circuit, the bidirectional buck / boost circuit, and the hydrogen production unit are all connected in parallel with the DC high-voltage bus.

[0008] The boost circuit includes a photovoltaic array, capacitor C1, capacitor C2, inductor L1, diode D1, and pulse switch S1; the photovoltaic array, capacitor C1, capacitor C2, and pulse switch S1 are all connected in parallel with the high-voltage bus; the inductor L1 is connected between capacitor C1 and pulse switch S1; the diode D1 is connected between pulse switch S1 and capacitor C2.

[0009] The bidirectional buck / boost circuit includes a pulse switch S2, a pulse switch S3, an energy storage power supply, capacitors C3 and C4, and an inductor L2. One end of the pulse switch S2 is connected to the positive terminal of the DC high-voltage bus, and the other end is connected to one end of the pulse switch S3. The other end of the pulse switch S3 is connected to the negative terminal of the DC high-voltage bus. The energy storage power supply and capacitor C3 are both connected in parallel with the pulse switch S3. The capacitor C4 is connected in parallel with the DC high-voltage bus. The inductor L2 is connected between the pulse switch S3 and capacitor C3.

[0010] The hydrogen production unit includes a DC / DC hydrogen production power supply and an electrolyzer; the input terminal of the DC / DC hydrogen production power supply is connected in parallel with the DC high-voltage bus, and the output terminal is connected to the electrolyzer.

[0011] The boost circuit is equipped with an integrated voltage and power control structure for a photovoltaic unidirectional converter. This integrated voltage and power control structure includes an MPPT control loop, a first power control loop, a control loop switching switch, a first current control loop, and a first PWM calculation module. The control loop switching switch is connected between the MPPT control loop, the first power control loop, and the first current control loop. The first PWM calculation module is connected between the first current control loop and the pulse switching transistor S1.

[0012] The MPPT control loop includes an MPPT algorithm module and a first voltage control loop, wherein the first voltage control loop is connected between the MPPT algorithm module and the control loop switching switch.

[0013] The bidirectional buck / boost circuit is equipped with an integrated voltage and power control structure for the energy storage bidirectional converter. This integrated voltage and power control structure includes a second voltage control loop, a second power control loop, a mode switching switch, a second current control loop, and a second PWM calculation module. The second voltage control loop and the second power control loop are both connected to the second current control loop. The mode switching switch is connected between the second power control loop and the second current control loop. The second PWM calculation module is connected between the second current control loop and pulse switching transistors S2 and S3.

[0014] The integrated photovoltaic-hydrogen storage energy management method includes the following steps:

[0015] The photovoltaic hydrogen storage system switches its operating mode according to the parameter value of the E_mode flag of the photovoltaic hydrogen storage energy management platform. When E_mode=1, the photovoltaic hydrogen storage energy management platform starts the energy management function and the photovoltaic hydrogen storage system switches to the scheduling mode; when E_mode=0, the photovoltaic hydrogen storage energy management platform stops the energy management function and the photovoltaic hydrogen storage system switches to the self-sustaining mode.

[0016] The photovoltaic hydrogen storage system coordinates the boost circuit and the bidirectional buck / boost circuit to supply power to the hydrogen production unit according to the switching operating modes. Specifically: when the operating mode is the scheduling mode, the photovoltaic hydrogen storage system balances the internal power flow according to the energy scheduling instructions of the photovoltaic hydrogen storage energy management platform to maintain the voltage stability of the DC high-voltage bus; when the operating mode is the self-sustaining mode, the photovoltaic hydrogen storage system automatically balances the internal power flow to maintain the voltage stability of the DC high-voltage bus.

[0017] Furthermore, the specific method by which the photovoltaic hydrogen storage system balances its internal power flow according to the scheduling instructions of the photovoltaic hydrogen storage energy management platform is as follows:

[0018] The photovoltaic-hydrogen storage energy management platform generates photovoltaic power dispatch instructions for the photovoltaic-hydrogen storage system on a rolling basis every 15 minutes, based on predicted photovoltaic power generation data. Hydrogen production load power dispatching instructions and energy storage power dispatch commands ;

[0019] The integrated voltage and power control structure of the photovoltaic unidirectional converter tracks photovoltaic power dispatch commands through the PI regulator in the first power control loop. Dynamically adjust photovoltaic output power ;

[0020] The integrated voltage and power control structure of the energy storage bidirectional converter tracks energy storage power dispatch commands through the PI regulator in the second power control loop. The charging and discharging power of the energy storage power supply is regulated by the PI regulator in the second power control loop. ;

[0021] The power flow of the DC high-voltage bus is dynamically allocated by dispatch commands: photovoltaic output power Prioritize fulfilling hydrogen production load power dispatch instructions If the photovoltaic output power If there is any surplus power, the surplus power will be used to charge the energy storage power source; if the photovoltaic output power... If the energy is insufficient, it will be supplemented by the discharge of the energy storage power source.

[0022] Furthermore, the specific method by which the photovoltaic hydrogen storage system automatically balances the internal power flow is as follows:

[0023] When the real-time capacity of the energy storage power supply At that time, the first power control loop is activated, and the integrated voltage and power control structure of the photovoltaic unidirectional converter controls the photovoltaic output power. Limits will be imposed, and a limit on photovoltaic power output will be specified. Energy storage power supply stops charging; Photovoltaic output power Priority will be given to supplying hydrogen production capacity; if there is a surplus, the curtailed photovoltaic power output will be further reduced. Or discharge the remaining power; if the photovoltaic output power If the energy is insufficient, the energy storage power supply can discharge to supplement it;

[0024] When the real-time capacity of the energy storage power supply At this time, the MPPT control loop is activated. The MPPT control loop tracks the maximum power point voltage in real time through the MPPT algorithm module and adjusts the operating voltage and current of the photovoltaic array accordingly to ensure optimal photovoltaic output power. Reaching maximum value; energy storage power supply freely charging and discharging to balance power flow; photovoltaic output power. Priority is given to supplying hydrogen production load; if there is surplus, the surplus power is used to charge the energy storage power source; if the photovoltaic output power... If the energy is insufficient, it will be supplemented by the discharge of the energy storage power source.

[0025] Furthermore, the value of the E_mode parameter is determined as follows:

[0026] When the photovoltaic-hydrogen storage energy management platform is working normally and the photovoltaic-hydrogen storage system requires scheduling commands, E_mode=1;

[0027] When the photovoltaic hydrogen storage energy management platform malfunctions or the internal power of the photovoltaic hydrogen storage system is severely unbalanced, E_mode=0.

[0028] Furthermore, when E_mode=1, the mode switching switch of the integrated voltage and power control structure of the energy storage bidirectional converter is closed, and both the second voltage control loop and the second power control loop are engaged. The output currents of the second voltage control loop and the second power control loop are superimposed as the input signal of the second current control loop. When E_mode=0, the mode switching switch of the integrated voltage and power control structure of the energy storage bidirectional converter is opened, the second voltage control loop is engaged, and the output current of the second voltage control loop is used as the input signal of the second current control loop.

[0029] The beneficial effects of this invention are as follows: This invention adopts a hardware architecture in which a boost converter circuit, a bidirectional buck / boost circuit, and a hydrogen production unit are connected in parallel to a DC high-voltage bus, replacing the traditional distributed structure of independent converters. This achieves physical integration and direct energy interaction between photovoltaic, energy storage, and hydrogen production units. Furthermore, through the photovoltaic-hydrogen storage energy management platform, the operating modes of the photovoltaic-hydrogen storage system are switched, achieving centralized intelligent control at the system level. The operating modes of the photovoltaic-hydrogen storage system include a scheduling mode and a self-sustaining mode. The scheduling mode can dynamically optimize power allocation according to external demand, while the self-sustaining mode can autonomously maintain internal power balance to ensure stable operation of the system under different operating conditions. Therefore, this invention can achieve centralized control of energy interaction between photovoltaic, energy storage, and hydrogen production units, thereby optimizing energy utilization efficiency. Attached Figure Description

[0030] Figure 1 This is a block diagram of the overall structure of an integrated photovoltaic and hydrogen storage energy management system according to the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of a photohydrogen storage system, which is part of an integrated photohydrogen storage energy management system according to the present invention.

[0032] Figure 3 This is a schematic diagram of the photovoltaic unidirectional converter voltage and power integrated control structure of a photovoltaic-hydrogen storage integrated energy management system according to the present invention. Figure 1 ;

[0033] Figure 4 This is a schematic diagram of the photovoltaic unidirectional converter voltage and power integrated control structure of a photovoltaic-hydrogen storage integrated energy management system according to the present invention. Figure 2 ;

[0034] Figure 5 This is a schematic diagram of the integrated voltage and power control structure of the bidirectional energy converter in an integrated photovoltaic-hydrogen storage energy management system according to the present invention. Figure 1 ;

[0035] Figure 6 This is a schematic diagram of the integrated voltage and power control structure of the bidirectional energy converter in an integrated photovoltaic-hydrogen storage energy management system according to the present invention. Figure 2 ;

[0036] Figure 7 This is a flowchart of an integrated photovoltaic-hydrogen storage energy management method according to the present invention. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.

[0039] Reference Figure 1 and Figure 2 As shown, this invention discloses an integrated photovoltaic-hydrogen storage energy management system, which includes a photovoltaic-hydrogen storage energy management platform and a photovoltaic-hydrogen storage system. The photovoltaic-hydrogen storage energy management platform is connected to the photovoltaic-hydrogen storage system. The photovoltaic-hydrogen storage system includes a boost circuit, a bidirectional buck / boost circuit, a DC high-voltage bus, and a hydrogen production unit. The boost circuit, bidirectional buck / boost circuit, and hydrogen production unit are all connected in parallel with the DC high-voltage bus. The boost circuit includes a photovoltaic array, capacitors C1 and C2, an inductor L1, a diode D1, and a pulse switch S1. The photovoltaic array, capacitors C1 and C2, and the pulse switch S1 are all connected in parallel with the high-voltage bus. The inductor L1 is connected between capacitor C1 and the pulse switch S1. The diode D1 is connected between the pulse switch S1 and the capacitor C2; the bidirectional buck / boost circuit includes a pulse switch S2, a pulse switch S3, an energy storage power supply, capacitors C3 and C4, and an inductor L2; one end of the pulse switch S2 is connected to the positive terminal of the DC high-voltage bus, and the other end is connected to one end of the pulse switch S3; the other end of the pulse switch S3 is connected to the negative terminal of the DC high-voltage bus; the energy storage power supply and capacitor C3 are both connected in parallel with the pulse switch S3; the capacitor C4 is connected in parallel with the DC high-voltage bus; the inductor L2 is connected between the pulse switch S3 and the capacitor C3; the hydrogen production unit includes a DC / DC hydrogen production power supply and an electrolyzer; the input terminal of the DC / DC hydrogen production power supply is connected in parallel with the DC high-voltage bus, and the output terminal is connected to the electrolyzer.

[0040] It should be noted that, in this embodiment, the photovoltaic-hydrogen storage energy management platform acts as the control layer, primarily responsible for monitoring, scheduling, and optimizing the operation of the photovoltaic-hydrogen storage system; the photovoltaic-hydrogen storage system acts as the execution layer, primarily responsible for responding to the control of the photovoltaic-hydrogen storage energy management platform to dynamically optimize internal power allocation or autonomously maintain internal power balance to optimize energy utilization efficiency. Specifically, the photovoltaic-hydrogen storage system includes a boost circuit, a bidirectional buck / boost circuit, a DC high-voltage bus, and a hydrogen production unit. The boost circuit serves as the photovoltaic end, the bidirectional buck / boost circuit as the energy storage end, and the hydrogen production unit as the hydrogen production end. The OST circuit and hydrogen production unit are connected in parallel to the DC high-voltage bus, enabling physical integration and direct energy interaction between the photovoltaic, energy storage, and hydrogen production ends. Furthermore, the boost circuit consists of a photovoltaic array, inductor L1, capacitors C1 and C2, diode D1, and pulse switch S1. The photovoltaic array generates solar power to serve as the input voltage for the boost circuit. Capacitor C1 filters the input voltage. Inductor L1 acts as an energy storage element, using periodic charging and discharging in conjunction with the pulse switch S1 to achieve voltage boost. Diode D1 prevents reverse current. The pulse switch S1 adjusts the boost ratio via PWM control to ensure... The output voltage of the boost circuit reaches the required high-voltage DC voltage; capacitor C2 is used to filter the output voltage of the boost circuit; the bidirectional buck / boost circuit consists of pulse switch S2, pulse switch S3, energy storage power supply, capacitor C3, capacitor C4, and inductor L2. The energy storage power supply, as the energy storage element, is mainly used to store or release energy to balance the energy balance within the photovoltaic hydrogen storage system; inductor L2 also serves as an energy storage element, used to achieve boost / buck conversion through periodic charging and discharging in conjunction with pulse switch S2 and pulse switch S3; pulse switch S2 and pulse switch S3 are used to adjust the boost ratio or deboost ratio through PWM control. The voltage ratio is set to ensure that the output voltage of the bidirectional buck / boost circuit reaches the required high-voltage DC voltage or that the input voltage of the bidirectional buck / boost circuit reaches the charging voltage required by the energy storage power supply. Capacitor C3 is used to filter the voltage on the energy storage power supply side of the bidirectional buck / boost circuit. Capacitor C4 is used to filter the voltage on the DC high-voltage bus side of the bidirectional buck / boost circuit. The DC high-voltage bus serves as a unified voltage platform to achieve real-time energy interaction between the photovoltaic end, energy storage end, and hydrogen production end, avoiding multi-stage conversion losses. The hydrogen production unit draws power from the DC high-voltage bus through a DC / DC hydrogen production power supply, adapting to the voltage required for hydrogen production in the electrolyzer.In the specific implementation of this invention, the photovoltaic-hydrogen storage system adopts a hardware architecture in which a boost circuit, a bidirectional buck / boost circuit, and a hydrogen production unit are connected in parallel to a DC high-voltage bus, replacing the traditional distributed structure of independent converters. This achieves physical integration and direct energy interaction between the photovoltaic, energy storage, and hydrogen production units. Furthermore, the photovoltaic-hydrogen storage system's operating mode is switched through a photovoltaic-hydrogen storage energy management platform, achieving centralized intelligent control at the system level. The operating modes of the photovoltaic-hydrogen storage system include a scheduling mode and a self-sustaining mode. The scheduling mode can dynamically optimize power allocation according to external demand, while the self-sustaining mode can autonomously maintain internal power balance to ensure stable operation of the system under different operating conditions. Therefore, this invention achieves centralized control of energy interaction between the photovoltaic, energy storage, and hydrogen production units, thereby optimizing energy utilization efficiency.

[0041] Reference Figure 3 and Figure 4 As shown, the boost circuit is equipped with a photovoltaic unidirectional converter voltage and power integrated control structure. The photovoltaic unidirectional converter voltage and power integrated control structure includes an MPPT control loop 1, a first power control loop 2, a control loop switching switch, a first current control loop 3, and a first PWM calculation module. The control loop switching switch is connected between the MPPT control loop 1, the first power control loop 2, and the first current control loop 3. The first PWM calculation module is connected between the first current control loop 3 and the pulse switching transistor S1. The MPPT control loop 1 includes an MPPT algorithm module and a first voltage control loop, and the first voltage control loop is connected between the MPPT algorithm module and the control loop switching switch.

[0042] It should be noted that, in this embodiment, the integrated voltage and power control structure of the photovoltaic unidirectional converter achieves maximum power point tracking or power limiting functions for photovoltaic power generation through the dynamic coordination of MPPT control loop 1, power control loop, and current loop, ensuring the stable operation of the photovoltaic-hydrogen storage system. Specifically, the MPPT control loop 1 ensures that the photovoltaic panel always operates at its maximum power point to improve power generation efficiency. Further, the MPPT control loop 1 includes an MPPT algorithm module and a first voltage control loop. The MPPT algorithm module is responsible for continuously detecting the voltage and current of the photovoltaic panel, calculating the current output power, and adjusting the reference voltage to ensure the photovoltaic panel always operates in the optimal power generation state. The first voltage control loop receives the reference voltage given by the MPPT algorithm, compares it with the actual photovoltaic voltage, calculates the current reference value through the PI regulator of the first voltage control loop, and transmits it to the first current control loop 3. The first power control loop 2 receives photovoltaic power scheduling instructions from the photovoltaic-hydrogen storage energy management platform. The current reference value is calculated by the PI regulator of the first power control loop 2 and transmitted to the first current control loop 3. The control loop switching switch is used to switch between MPPT control loop 1 and the first power control loop 2, and inputs the output current of MPPT control loop 1 or the first power control loop 2 to the first current control loop 3. The first current control loop 3 is used to receive the current value input from the control loop switching switch as the current reference value, compare it with the real-time current of inductor L1, calculate the adjustment amount of PWM pulse duty cycle by the PI regulator of the first current control loop 3, and output the adjustment amount of PWM pulse duty cycle to the first PWM calculation module to control the conduction and cutoff of pulse switch S1. The first PWM calculation module is used to adjust the PWM pulse duty cycle by the adjustment amount of PWM pulse duty cycle input from the first current control loop 3, generate a specific PWM waveform, and drive the conduction and cutoff of pulse switch S1 through optocoupler isolation. In the specific implementation of this invention, the photovoltaic unidirectional converter voltage-power integrated control structure switches between MPPT control loop 1 and the first power control loop 2 according to the real-time capacity of the energy storage power source. That is, when the real-time capacity of the energy storage power source... At this time, the first power control loop 2 is activated, and the integrated voltage and power control structure of the photovoltaic unidirectional converter controls the photovoltaic output power. Limits will be imposed, and a limit on photovoltaic power output will be specified. When the real-time capacity of the energy storage power supply At this time, MPPT control loop 1 is activated. MPPT control loop 1 tracks the maximum power point voltage in real time through the MPPT algorithm module and adjusts the operating voltage and current of the photovoltaic array in real time to ensure the photovoltaic output power is optimal. It has reached its maximum value.

[0043] It should also be noted that, in this embodiment, when MPPT control loop 1 is activated, the real-time output voltage of the photovoltaic array... and real-time output current As the input signal of MPPT control loop 1, MPPT control loop 1 generates a maximum power point voltage reference value through the MPPT algorithm module. ;by As the input signal of the first voltage control loop, As the feedback signal of the first voltage control loop, it is passed through the PI regulator. Calculate current reference value When the first power control loop 2 is activated, the photovoltaic power dispatch command is issued. Or limit the photovoltaic power output. As the input signal of the first power control loop 2, the photovoltaic output power As the feedback signal of the first power control loop 2, it passes through the PI regulator of the first power control loop 2. Calculate current reference value When the MPPT control loop 1 or the first power control loop 2 outputs the reference current value Then, the first current control loop 3... As the input signal, the real-time current of inductor L1 As a feedback signal, and through a PI controller The adjustment amount of the PWM pulse duty cycle is calculated and input to the first PWM calculation module. The first PWM calculation module adjusts the PWM pulse duty cycle based on the adjustment amount input from the first current control loop 3, generates a specific PWM waveform, and drives the pulse switch S1 to turn on and off through optocoupler isolation, thereby coordinating with the working mode of the photovoltaic hydrogen storage system for energy conversion and power regulation. Furthermore, when the pulse switch S1 is turned on, the inductor L1 stores energy, and the photovoltaic output current increases, preparing for voltage boost. When the pulse switch S1 is turned off, the inductor L1 releases energy, supplying power to the DC high-voltage bus, completing the DC-DC conversion. Moreover, by adjusting the duty cycle of the PWM signal, the on / off time ratio can be dynamically adjusted to achieve MPPT tracking, power limiting, and bus voltage regulation.

[0044] Reference Figure 5 and Figure 6As shown, the bidirectional buck / boost circuit is equipped with an integrated voltage and power control structure for the bidirectional energy storage converter. This integrated voltage and power control structure includes a second voltage control loop 4, a second power control loop 5, a mode switching switch, a second current control loop 6, and a second PWM calculation module. The second voltage control loop 4 and the second power control loop 5 are both connected to the second current control loop 6. The mode switching switch is connected between the second power control loop 5 and the second current control loop 6. The second PWM calculation module is connected between the second current control loop 6 and the pulse switching transistors S2 and S3.

[0045] It should be noted that, in this embodiment, the voltage and power integrated control structure of the energy storage bidirectional converter dynamically coordinates the working states of the second voltage control loop 4 and the second power control loop 5 through a mode switching switch to adapt to different operating modes, thereby realizing the charging and discharging management of the energy storage battery. Specifically, the second voltage control loop 4 is used to collect the voltage value of the DC high-voltage bus and compare it with the set value of the DC high-voltage bus. The PI regulator of the second voltage control loop 4 calculates the current output value of the second voltage control loop 4. This current output value is used to adjust the energy storage charging and discharging power through the subsequent second control current loop and PWM calculation module, forcing the real-time voltage of the DC voltage bus to converge to 720V, thereby maintaining the system voltage stability. The second power control loop 5 is used to receive the energy storage power scheduling command from the photovoltaic hydrogen energy management platform and compare it with the charging and discharging power of the energy storage power supply. The PI regulator of the second power control loop 5 calculates the current output value of the second voltage control loop 4. The regulator calculates the current output value of the second power control loop 5 and transmits it to the second current control loop 6. The second current control loop 6 receives the current output value of the second voltage control loop 4 and the current output value of the second power control loop 5 (scheduled mode), or receives the current output value of the second voltage control loop 4 alone (self-sustaining mode), and compares it with the current of inductor L2. The PI regulator of the second current control loop 6 calculates the adjustment amount of the PWM pulse duty cycle and outputs the adjustment amount of the PWM pulse duty cycle to the second PWM calculation module to control the conduction and turn-off of pulse switch S2 and pulse switch S3. The second PWM calculation module adjusts the PWM pulse duty cycle based on the adjustment amount of the PWM pulse duty cycle input from the first current control loop 3, generates a specific PWM waveform, and drives the conduction and turn-off of pulse switch S2 and pulse switch S3 through optocoupler isolation.In the specific implementation of this invention, firstly, the voltage and power integrated control structure of the energy storage bidirectional converter controls the opening and closing of the mode switching switch according to the operating mode of the photovoltaic-hydrogen storage system. Specifically, when the photovoltaic-hydrogen storage system is in the scheduling mode, the mode switching switch is closed, and the output currents of the second voltage control loop 4 and the second power control loop 5 are both used as the input signal of the second current control loop 6; when the photovoltaic-hydrogen storage system is in the self-sustaining mode, the mode switching switch is open, and only the output current of the second voltage control loop is used as the input signal of the second current control loop 6; subsequently, the second current control loop 6 compares the input signal and the feedback signal (inductor L1)... The current is controlled by the PI regulator in the second current control loop 6, which calculates the adjustment amount of the PWM pulse duty cycle and inputs it to the second PWM calculation module. Finally, the second PWM calculation module adjusts the PWM pulse duty cycle according to the adjustment amount and generates a specific PWM waveform. It then drives the pulse switch S2 and pulse switch S3 to turn on and off through optocoupler isolation to achieve charging and discharging management of the energy storage battery. Furthermore, when the pulse switch S3 is switched on and off at high frequency and the pulse switch S2 is normally off, the energy storage power supply is charged; when the pulse switch S2 is switched on and off at high frequency and the pulse switch S3 is normally off, the energy storage power supply is discharged.

[0046] It should also be noted that, in this embodiment, when the photovoltaic hydrogen storage system is in scheduling mode, the second voltage control loop 4 uses the real-time voltage value of the DC high-voltage bus. As the input signal, the voltage setpoint of the DC high-voltage bus is used. As a feedback signal, through the PI controller Calculate the output current reference value of the first voltage control loop; the second power control loop 5 uses energy storage power dispatch commands. As the input signal, the charging and discharging power of the energy storage power supply As a feedback signal, through the PI controller Calculate the output current reference value of the second power control loop 5. At this time, the sum of the output current reference values ​​of the second voltage control loop 4 and the second power control loop 5 is... The second current control loop 6 is... As the input signal, the current of inductor L2 As a feedback signal, it is passed through a PI controller. The adjustment amount of the PWM pulse duty cycle is calculated and input to the second PWM calculation module. The second PWM calculation module adjusts the PWM pulse duty cycle based on the adjustment amount input from the second current control loop 6, generates a specific PWM waveform, and drives the pulse switching transistors S2 and S3 to turn on and off through optocoupler isolation, thereby coordinating with the working mode of the photovoltaic hydrogen storage system to realize the charging and discharging of the energy storage power supply. When the photovoltaic hydrogen storage system is in self-sustaining mode, the input signal of the second current control loop 6... The output power reference value of the second power control loop 5 is used. The transmission paths and methods of other signals are the same as in the scheduling mode, and will not be described in detail here.

[0047] Reference Figure 7 As shown, the present invention also discloses an integrated photovoltaic-hydrogen storage energy management method, applied to an integrated photovoltaic-hydrogen storage energy management system as described in the above embodiments. The integrated photovoltaic-hydrogen storage energy management method includes the following steps:

[0048] The photovoltaic-hydrogen storage system switches its operating mode according to the parameter value of the E_mode flag of the photovoltaic-hydrogen storage energy management platform. Specifically, when E_mode=1, the photovoltaic-hydrogen storage energy management platform activates its energy management function, and the photovoltaic-hydrogen storage system switches to scheduling mode; when E_mode=0, the photovoltaic-hydrogen storage energy management platform stops its energy management function, and the photovoltaic-hydrogen storage system switches to self-sustaining mode. It should be noted that the E_mode parameter value is determined as follows: when the photovoltaic-hydrogen storage energy management platform is operating normally and the photovoltaic-hydrogen storage system requires scheduling commands, E_mode=1; when the photovoltaic-hydrogen storage energy management platform malfunctions or the photovoltaic-hydrogen storage system experiences internal issues, E_mode=1. When the power is severely imbalanced, E_mode=0. Additionally, when E_mode=1, the mode switching switch of the integrated voltage and power control structure of the energy storage bidirectional converter is closed, and both the second voltage control loop 4 and the second power control loop 5 are activated. The output currents of the second voltage control loop 4 and the second power control loop 5 are superimposed as the input signal of the second current control loop 6. When E_mode=0, the mode switching switch of the integrated voltage and power control structure of the energy storage bidirectional converter is opened, the second voltage control loop 4 is activated, and the output current of the second voltage control loop 4 is used as the input signal of the second current control loop 6.

[0049] The photovoltaic hydrogen storage system coordinates the boost circuit and the bidirectional buck / boost circuit to supply power to the hydrogen production unit according to the switching operating modes. Specifically: when the operating mode is the scheduling mode, the photovoltaic hydrogen storage system balances the internal power flow according to the energy scheduling instructions of the photovoltaic hydrogen storage energy management platform to maintain the voltage stability of the DC high-voltage bus; when the operating mode is the self-sustaining mode, the photovoltaic hydrogen storage system automatically balances the internal power flow to maintain the voltage stability of the DC high-voltage bus.

[0050] It should be noted that, in this embodiment, the photovoltaic-hydrogen storage energy management platform switches the photovoltaic-hydrogen storage system between two operating modes: self-sustaining mode and scheduling mode, through the parameter value of the working mode flag E_mode. The scheduling mode can dynamically optimize power allocation based on external demand, while the self-sustaining mode can autonomously maintain internal power balance to ensure stable operation of the system under different operating conditions, achieving centralized intelligent control at the system level. Therefore, this embodiment can achieve centralized control of energy interaction between photovoltaic, energy storage, and hydrogen production units, thereby optimizing energy utilization efficiency.

[0051] Furthermore, the specific method by which the photovoltaic hydrogen storage system balances its internal power flow according to the scheduling instructions of the photovoltaic hydrogen storage energy management platform is as follows:

[0052] The photovoltaic-hydrogen storage energy management platform generates photovoltaic power dispatch instructions for the photovoltaic-hydrogen storage system on a rolling basis every 15 minutes, based on predicted photovoltaic power generation data. Hydrogen production load power dispatching instructions and energy storage power dispatch commands ;

[0053] The integrated voltage and power control structure of the photovoltaic unidirectional converter tracks photovoltaic power dispatch commands through the PI regulator in the first power control loop 2. Dynamically adjust photovoltaic output power ;

[0054] The integrated voltage and power control structure of the energy storage bidirectional converter tracks the energy storage power dispatch command through the PI regulator in the second power control loop 5. The charging and discharging power of the energy storage power supply is adjusted by the PI regulator in the second power control loop 5. ;

[0055] The power flow of the DC high-voltage bus is dynamically allocated by dispatch commands: photovoltaic output power Prioritize fulfilling hydrogen production load power dispatch instructions If the photovoltaic output power If there is any surplus power, the surplus power will be used to charge the energy storage power source; if the photovoltaic output power... If the energy is insufficient, it will be supplemented by the discharge of the energy storage power source.

[0056] It should also be noted that the specific method by which the photovoltaic hydrogen storage system automatically balances the internal power flow is as follows:

[0057] When the real-time capacity of the energy storage power supply At that time, the first power control loop 2 is activated, and the integrated voltage and power control structure of the photovoltaic unidirectional converter controls the photovoltaic output power. Limits will be imposed, and a limit on photovoltaic power output will be specified. Energy storage power supply stops charging; Photovoltaic output power Priority will be given to supplying hydrogen production capacity; if there is a surplus, the curtailed photovoltaic power output will be further reduced. Or discharge the remaining power; if the photovoltaic output power If the energy is insufficient, the energy storage power supply can discharge to supplement it;

[0058] When the real-time capacity of the energy storage power supply At this time, MPPT control loop 1 is activated. MPPT control loop 1 tracks the maximum power point voltage in real time through the MPPT algorithm module and adjusts the operating voltage and current of the photovoltaic array in real time to ensure the photovoltaic output power is optimal. Reaching maximum value; energy storage power supply freely charging and discharging to balance power flow; photovoltaic output power. Priority is given to supplying hydrogen production load; if there is surplus, the surplus power is used to charge the energy storage power source; if the photovoltaic output power... If the energy is insufficient, it will be supplemented by the discharge of the energy storage power source.

[0059] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0060] 1. By integrating photovoltaic, energy storage and hydrogen production units into a unified DC high-voltage bus architecture, direct energy interaction is achieved, which not only simplifies the system structure, but also avoids the efficiency loss caused by traditional multi-stage conversion, significantly improves the overall energy efficiency of the system, and makes energy flow more efficient and flexible.

[0061] 2. The integrated voltage and power control structure of the photovoltaic unidirectional converter dynamically switches between MPPT control loop 1 and the first power control loop 2, which not only ensures the maximum power output of the photovoltaic array, but also flexibly limits the power generation according to system requirements. This intelligent control strategy effectively solves the contradiction between the volatility of photovoltaic power generation and the stability of the system. In particular, it automatically activates the power limiting function when the energy storage capacity is insufficient, preventing the risk of system overload.

[0062] 3. The integrated voltage and power control structure of the energy storage bidirectional converter realizes intelligent switching between dispatch mode and self-sustaining mode through a closed and open mode switching switch. In dispatch mode, it can accurately execute external power commands, while in the event of communication interruption or system abnormality, it automatically switches to self-sustaining mode and maintains bus stability through voltage closed-loop control. This dual protection mechanism greatly improves the reliability and anti-interference capability of the system and ensures continuous power supply to critical hydrogen production loads.

[0063] 4. By working in tandem with the photovoltaic-hydrogen storage system through the photovoltaic-hydrogen energy management platform, an optimized control system of centralized management and decentralized execution is formed. Through rolling optimization scheduling with a 15-minute cycle, dynamic matching of photovoltaic power generation, energy storage charging and discharging, and hydrogen production load is achieved, thereby improving the utilization rate of renewable energy.

[0064] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A photovoltaic-hydrogen storage integrated energy management method, applied to a photovoltaic-hydrogen storage integrated energy management system, characterized in that, The integrated photovoltaic-hydrogen storage energy management system includes a photovoltaic-hydrogen storage energy management platform and a photovoltaic-hydrogen storage system, wherein the photovoltaic-hydrogen storage energy management platform is connected to the photovoltaic-hydrogen storage system. The photovoltaic hydrogen storage system includes a boost circuit, a bidirectional buck / boost circuit, a DC high-voltage bus, and a hydrogen production unit; the boost circuit, the bidirectional buck / boost circuit, and the hydrogen production unit are all connected in parallel with the DC high-voltage bus. The boost circuit includes a photovoltaic array, capacitor C1, capacitor C2, inductor L1, diode D1, and pulse switch S1; the photovoltaic array, capacitor C1, capacitor C2, and pulse switch S1 are all connected in parallel with the high-voltage bus; the inductor L1 is connected between capacitor C1 and pulse switch S1; the diode D1 is connected between pulse switch S1 and capacitor C2. The bidirectional buck / boost circuit includes a pulse switch S2, a pulse switch S3, an energy storage power supply, capacitors C3 and C4, and an inductor L2. One end of the pulse switch S2 is connected to the positive terminal of the DC high-voltage bus, and the other end is connected to one end of the pulse switch S3. The other end of the pulse switch S3 is connected to the negative terminal of the DC high-voltage bus. The energy storage power supply and capacitor C3 are both connected in parallel with the pulse switch S3. The capacitor C4 is connected in parallel with the DC high-voltage bus. The inductor L2 is connected between the pulse switch S3 and capacitor C3. The hydrogen production unit includes a DC / DC hydrogen production power supply and an electrolyzer; the input terminal of the DC / DC hydrogen production power supply is connected in parallel with the DC high-voltage bus, and the output terminal is connected to the electrolyzer. The boost circuit is equipped with an integrated voltage and power control structure for a photovoltaic unidirectional converter. This integrated voltage and power control structure includes an MPPT control loop, a first power control loop, a control loop switching switch, a first current control loop, and a first PWM calculation module. The control loop switching switch is connected between the MPPT control loop, the first power control loop, and the first current control loop. The first PWM calculation module is connected between the first current control loop and the pulse switching transistor S1. The MPPT control loop includes an MPPT algorithm module and a first voltage control loop, wherein the first voltage control loop is connected between the MPPT algorithm module and the control loop switching switch. The bidirectional buck / boost circuit is equipped with an integrated voltage and power control structure for the energy storage bidirectional converter. This integrated voltage and power control structure includes a second voltage control loop, a second power control loop, a mode switching switch, a second current control loop, and a second PWM calculation module. The second voltage control loop and the second power control loop are both connected to the second current control loop. The mode switching switch is connected between the second power control loop and the second current control loop. The second PWM calculation module is connected between the second current control loop and pulse switching transistors S2 and S3. The integrated photovoltaic-hydrogen storage energy management method includes the following steps: The photovoltaic hydrogen storage system switches its operating mode according to the parameter value of the E_mode flag of the photovoltaic hydrogen storage energy management platform. When E_mode=1, the photovoltaic hydrogen storage energy management platform starts the energy management function and the photovoltaic hydrogen storage system switches to the scheduling mode; when E_mode=0, the photovoltaic hydrogen storage energy management platform stops the energy management function and the photovoltaic hydrogen storage system switches to the self-sustaining mode. The photovoltaic hydrogen storage system coordinates the boost circuit and the bidirectional buck / boost circuit to supply power to the hydrogen production unit according to the switching operating modes. Specifically: when the operating mode is the scheduling mode, the photovoltaic hydrogen storage system balances the internal power flow according to the energy scheduling instructions of the photovoltaic hydrogen storage energy management platform to maintain the voltage stability of the DC high-voltage bus; when the operating mode is the self-sustaining mode, the photovoltaic hydrogen storage system automatically balances the internal power flow to maintain the voltage stability of the DC high-voltage bus.

2. The integrated photovoltaic-hydrogen storage energy management method according to claim 1, characterized in that, The specific method by which the photovoltaic hydrogen storage system balances its internal power flow according to the scheduling instructions of the photovoltaic hydrogen storage energy management platform is as follows: The photovoltaic-hydrogen storage energy management platform generates photovoltaic power dispatch instructions for the photovoltaic-hydrogen storage system on a rolling basis every 15 minutes, based on predicted photovoltaic power generation data. Hydrogen production load power dispatching instructions and energy storage power dispatch commands ; The integrated voltage and power control structure of the photovoltaic unidirectional converter tracks photovoltaic power dispatch commands through the PI regulator in the first power control loop. Dynamically adjust photovoltaic output power ; The integrated voltage and power control structure of the energy storage bidirectional converter tracks energy storage power dispatch commands through the PI regulator in the second power control loop. The charging and discharging power of the energy storage power supply is regulated by the PI regulator in the second power control loop. ; The power flow of the DC high-voltage bus is dynamically allocated by dispatch commands: photovoltaic output power Prioritize fulfilling hydrogen production load power dispatch instructions If the photovoltaic output power If there is any surplus power, the surplus power will be used to charge the energy storage power source; if the photovoltaic output power... If the energy is insufficient, it will be supplemented by the discharge of the energy storage power source.

3. The integrated photovoltaic-hydrogen storage energy management method according to claim 2, characterized in that, The specific method by which the photovoltaic hydrogen storage system automatically balances the internal power flow is as follows: When the real-time capacity of the energy storage power supply At that time, the first power control loop is activated, and the integrated voltage and power control structure of the photovoltaic unidirectional converter controls the photovoltaic output power. Limits will be imposed, and a limit on photovoltaic power output will be specified. ; Energy storage power supply stops charging; photovoltaic output power Priority will be given to supplying hydrogen production capacity; if there is a surplus, the curtailed photovoltaic power output will be further reduced. Or discharge the remaining power; if the photovoltaic output power If the energy is insufficient, the energy storage power supply can discharge to supplement it; When the real-time capacity of the energy storage power supply At this time, the MPPT control loop is activated. The MPPT control loop tracks the maximum power point voltage in real time through the MPPT algorithm module and adjusts the operating voltage and current of the photovoltaic array accordingly to ensure optimal photovoltaic output power. Reaching maximum value; energy storage power supply freely charging and discharging to balance power flow; photovoltaic output power. Priority is given to supplying hydrogen production load; if there is surplus, the surplus power is used to charge the energy storage power source; if the photovoltaic output power... If the energy is insufficient, it will be supplemented by the discharge of the energy storage power source.

4. The integrated photovoltaic-hydrogen storage energy management method according to claim 1, characterized in that, The method for determining the value of the E_mode parameter is as follows: When the photovoltaic-hydrogen storage energy management platform is working normally and the photovoltaic-hydrogen storage system requires scheduling commands, E_mode=1; When the photovoltaic hydrogen storage energy management platform malfunctions or the internal power of the photovoltaic hydrogen storage system is severely unbalanced, E_mode=0.

5. The integrated photovoltaic-hydrogen storage energy management method according to claim 1, characterized in that, When E_mode=1, the mode switching switch of the integrated voltage and power control structure of the energy storage bidirectional converter is closed, and both the second voltage control loop and the second power control loop are engaged. The output currents of the second voltage control loop and the second power control loop are superimposed as the input signal of the second current control loop. When E_mode=0, the mode switching switch of the integrated voltage and power control structure of the energy storage bidirectional converter is opened, the second voltage control loop is engaged, and the output current of the second voltage control loop is used as the input signal of the second current control loop.

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