Off-grid type green electricity hydrogen production power control method, device, equipment and medium

Abstract

The invention discloses an off-grid type green electricity hydrogen production power control method, device and equipment and a medium, and the off-grid type green electricity hydrogen production power control method comprises the steps: calculating a matched active-frequency adjustment curve according to the active-frequency droop characteristic of a power generation side, and configuring the matched active-frequency adjustment curve to load side hydrogen production equipment; when the power generation power changes suddenly, the system frequency changes accordingly, the hydrogen production equipment senses the frequency in real time through an electrical link, the active power of the hydrogen production equipment is autonomously and rapidly adjusted according to a preset adjusting curve so as to establish system transient balance, and the process does not depend on communication; after the transient balance is established, the stable system power at the moment is obtained through a communication link, and the power set values of the power generation side and the load side are synchronously updated according to the stable system power, so that the system is recovered to the rated frequency to operate. The problem of frequency collapse caused by system energy imbalance is effectively solved, and the operation reliability and robustness of the off-grid hydrogen production system are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of hydrogen production technology, and in particular to an off-grid green electricity hydrogen production power control method, apparatus, equipment and medium. Background Technology

[0002] With the advancement of the "dual carbon" goal, off-grid green electricity hydrogen production systems that directly drive water electrolysis using photovoltaic power generation have attracted much attention due to their carbon-free emissions and high efficiency. In off-grid systems without energy storage, electricity production and consumption must be balanced in real time to maintain the stability of system voltage and frequency. However, photovoltaic power generation has inherent volatility and intermittency, and is easily affected by factors such as changes in sunlight intensity and cloud cover. At the same time, the power generation units in the system may suddenly shut down due to malfunctions, all of which can lead to drastic changes in power generation.

[0003] In existing technologies, the control strategies for maintaining the energy balance of such systems primarily rely on centralized energy management systems, i.e., energy management control units, which perform real-time scheduling via communication links. This approach requires the energy management control unit to accurately predict photovoltaic power generation and issue millisecond-level power adjustment commands to the hydrogen production load through a high-speed, highly reliable communication network. However, off-grid hydrogen production systems deployed in remote areas or harsh environments often struggle to establish and maintain communication links with high real-time performance and low latency. The risks of communication delays, packet loss, or interruptions are extremely high, resulting in control commands not being delivered in a timely manner. Furthermore, accurately predicting rapidly changing photovoltaic power itself presents technical challenges and computational delays.

[0004] This strong reliance on high-real-time communication and accurate power forecasting severely limits the response speed of existing systems when faced with sudden changes in power generation. When power generation suddenly drops, if the hydrogen production load cannot reduce its power in a very short time, the system will experience a sharp drop in frequency and voltage due to energy imbalance. This can lead to decreased hydrogen production efficiency and protective shutdowns of equipment, or even grid collapse, system disconnection, and inability to operate safely and stably. Therefore, how to achieve rapid and autonomous response to photovoltaic power generation fluctuations and equipment failures, and quickly maintain system energy balance without relying on high-real-time communication and advanced power forecasting, has become a key technical challenge restricting the widespread application of off-grid hydrogen production technology without energy storage. Summary of the Invention

[0005] The embodiments of the present invention provide an off-grid green electricity hydrogen production power control method, device, equipment and medium, which aims to solve the technical problem in the prior art that it is difficult to quickly maintain the system energy balance in the absence of high real-time communication and power prediction when photovoltaic power generation fluctuates or equipment fails in off-grid green electricity hydrogen production systems without energy storage.

[0006] In a first aspect, embodiments of the present invention provide an off-grid green electricity hydrogen production power control method, applied to an off-grid green electricity hydrogen production system, including a power generation side, a load side, and an electrical link, wherein the power generation side and the load side are electrically connected through the electrical link. The method includes: acquiring the active power-frequency droop characteristic of the power generation side, calculating an active power-frequency adjustment curve based on the active power-frequency droop characteristic, and configuring it to the load side; when the power generation of the system changes, adjusting the active power of the load side based on the real-time system frequency of the system and the active power-frequency adjustment curve to establish a system transient balance; after the system transient balance is established, acquiring the stable system power of the system, and synchronously adjusting the active power setpoint of the power generation side and the active power setpoint of the load side according to the stable system power.

[0007] Secondly, embodiments of the present invention also provide an off-grid green electricity hydrogen production power control device for executing the off-grid green electricity hydrogen production power control method described above.

[0008] Thirdly, embodiments of the present invention also provide a computer device, the computer device including a memory and a processor connected to the memory; the memory is used to store a computer program; the processor is used to run the computer program stored in the memory to perform the steps of the above-described off-grid green electricity hydrogen production power control method.

[0009] Fourthly, embodiments of the present invention also provide a computer-readable storage medium storing a computer program, the computer program including program instructions, which, when executed by a processor, can implement the steps of the above-described off-grid green electricity hydrogen production power control method.

[0010] Compared with the prior art, the beneficial effects of the present invention are: In the technical solution of this invention, the off-grid green electricity hydrogen production power control method calculates a matching active-frequency adjustment curve based on the active-frequency droop characteristics of the power generation side and configures it to the hydrogen production equipment on the load side. When the power generation suddenly changes, the system frequency changes accordingly. The hydrogen production equipment senses this frequency in real time through the electrical link and autonomously and quickly adjusts its own active power according to the preset adjustment curve to establish a transient system balance. This process does not rely on communication. After the transient balance is established, the stable system power is obtained through the communication link, and the power setpoints on the power generation side and the load side are updated synchronously to restore the system to rated frequency operation. This effectively solves the frequency collapse problem caused by system energy imbalance and significantly improves the operational reliability and robustness of the off-grid hydrogen production system. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A flowchart of the off-grid green electricity hydrogen production power control method provided by the present invention; Figure 2 The first sub-flowchart of the off-grid green electricity hydrogen production power control method provided by the present invention; Figure 3 The second sub-flowchart of the off-grid green electricity hydrogen production power control method provided by the present invention; Figure 4 The third sub-flowchart of the off-grid green electricity hydrogen production power control method provided by the present invention; Figure 5 The fourth sub-flowchart of the off-grid green electricity hydrogen production power control method provided by the present invention; Figure 6 The fifth sub-flowchart of the off-grid green electricity hydrogen production power control method provided by the present invention; Figure 7 The sixth sub-flowchart of the off-grid green electricity hydrogen production power control method provided by the present invention; Figure 8 A schematic block diagram of a unit of the off-grid green electricity hydrogen production power control device provided by the present invention; Figure 9 A schematic block diagram of a computer device provided in an embodiment of the present invention; Figure 10 The off-grid green electricity hydrogen production power control method provided by the present invention is applied to an independent green electricity hydrogen production system without energy storage. (System block diagram) Figure 11 A logic block diagram illustrating the load reduction logic of the off-grid green electricity hydrogen production power control method provided by this invention; Figure 12 The logic block diagram of the virtual synchronous machine control strategy of the photovoltaic inverter for the off-grid green electricity hydrogen production power control method provided by the present invention. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0015] It should also be understood that the terminology used in this specification is for the purpose of describing embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0016] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0017] In order to solve the technical problem in the prior art that it is difficult to quickly maintain the system energy balance in off-grid green electricity hydrogen production systems without energy storage when photovoltaic power generation fluctuates or equipment fails, in the absence of high real-time communication and power prediction, the present invention discloses an off-grid green electricity hydrogen production power control method.

[0018] The off-grid green electricity hydrogen production power control method of the present invention is applied to a stand-alone green electricity hydrogen production system without energy storage, as described above. Figure 11 As shown, this system is not connected to the public power grid and supplies power to the hydrogen production load entirely from renewable energy. The system mainly consists of five parts: the power generation side, the load side, the electrical link, the communication link, and the energy management control unit, which together realize the generation, transmission, consumption, and intelligent regulation of energy.

[0019] The power generation side functions to convert solar energy into electrical energy and provide voltage and frequency support for the system. It consists of several photovoltaic modules and connected grid-mounted photovoltaic inverters. These inverters employ grid-mounted technologies such as virtual synchronous generators (VSGs) or droop control, possessing voltage source characteristics and autonomous synchronization capabilities. They can establish and stabilize system voltage and frequency without relying on an external power grid. Their core characteristic is a preset active-frequency droop feature; that is, when the system's active power is unbalanced, they can respond to power changes by actively adjusting their output frequency, much like a traditional synchronous generator, thus becoming the dominant force in the system's dynamic frequency behavior.

[0020] The load side functions to consume electrical energy and complete the water electrolysis process to produce hydrogen. The load side mainly consists of a hydrogen production power source and an electrolyzer connected to it. The hydrogen production power source is a high-power variable DC power source, whose input is connected to an AC bus, and whose output provides adjustable DC voltage and current to the electrolyzer. Under the action of DC current, the electrolyzer decomposes water into hydrogen and oxygen, and stores the hydrogen in a hydrogen storage unit.

[0021] The electrical link functions as a physical channel for power transmission. In this embodiment, the electrical link is an AC bus connecting the generation side and the load side. It not only transmits active and reactive power, but more importantly, its voltage and frequency serve as real-time physical quantities of the system state, acting as carriers for information exchange between the generation side and the load side. Especially during transient processes, the frequency signal carries crucial information about power imbalance.

[0022] The communication link is used to enable digital information exchange between devices. It typically employs industrial communication protocols such as CAN, Modbus TCP, or Ethernet to connect the energy management control unit, each photovoltaic inverter, and each hydrogen production power source. The communication link is used to issue control commands, upload device status, and configure control parameters; it serves as the channel for non-real-time, high-precision control operations such as system presets and steady-state recovery.

[0023] The energy management control unit is responsible for global monitoring and coordinated control. It collects system information via a communication link, calculates and distributes control strategies, but does not directly participate in transient regulation. In this invention, the core task of the energy management control unit is to acquire the active power-frequency droop characteristics of the power generation side during system startup or steady-state operation, calculate the required active power-frequency regulation curve for the load side based on this, and then configure it to the hydrogen production power source via the communication link to complete the preset control strategy. Furthermore, after the transient process ends, it reads the stable system power and synchronously updates the power setpoints on both the power generation and load sides to achieve accurate frequency recovery.

[0024] Reference Figures 1 to 7 and Figure 12 The off-grid green electricity hydrogen production power control method includes the following steps: S110. Obtain the active power-frequency droop characteristic of the power generation side, calculate the active power-frequency adjustment curve based on the active power-frequency droop characteristic, and configure it to the load side. S120. When the power generation of the system changes, the active power on the load side is adjusted based on the real-time system frequency and the active power-frequency regulation curve to establish a transient balance of the system. S130. After the system transient balance is established, the system power after stabilization is obtained, and the active power setting value of the power generation side and the active power setting value of the load side are adjusted synchronously according to the system power after stabilization.

[0025] After the system starts up and enters steady-state operation, the energy management control unit first queries and obtains the active-frequency droop characteristic parameters of the grid-type photovoltaic inverter on the generation side through the communication link. These parameters typically include the damping coefficient. and inertial time constant These factors collectively determine the inverter's dynamic response characteristics. Based on these characteristics, the energy management control unit (EDU) calculates a matching active power-frequency regulation curve. This curve defines how the load side should proportionally reduce its active power when the system frequency decreases, achieving rapid supply-demand matching. After calculation, the EDU configures the parameters of this regulation curve to the local controllers of each hydrogen production power source via a communication link, thus pre-setting the control strategy. The parameters of the active power-frequency regulation curve include, for example, a frequency-power mapping relationship or a control function.

[0026] When the system experiences a sudden decrease in sunlight intensity or a partial shutdown of photovoltaic units due to a malfunction, the total output power on the generation side drops instantaneously. At this time, the maximum power point tracking (MPPT) setting value... The frequency of the output voltage will decrease due to changes in sunlight. Because power generation is less than the load, the system experiences energy imbalance. Based on its inherent droop characteristics, the grid-connected photovoltaic inverter on the power generation side will automatically reduce the angular frequency of its output voltage. This leads to the system frequency of the AC bus. The voltage begins to drop. At this point, the local controllers of each hydrogen production power source continuously sample the AC bus voltage on the electrical link through their built-in software phase-locked loop (SPLL) modules and calculate the current system frequency in real time. The hydrogen production power source will sense the real-time system frequency. Substituting the preset active power-frequency regulation curve, a reduced power command value corresponding to the frequency reduction is calculated. The main control unit of the hydrogen production power source adopts a "competitive minimum" control strategy, which selects the lowest power value from the received power control unit. With the above frequency adjustment command The two values ​​are compared, and the smaller value is selected as the final power reference value. This immediately drives the power circuit to reduce the output current and decrease the load power. This process is entirely local to the device, with response time limited only by the bandwidth of the phase-locked loop and control loop, typically within tens of milliseconds. No communication commands are required, ultimately restoring the system's power generation and consumption to a new balance, and reducing the system frequency. Once the decline stops and the value stabilizes at a new lower level, a transient equilibrium is established in the system.

[0027] After transient equilibrium is established, the system enters a short-term steady state. The energy management control unit periodically reads the actual active power reported by each hydrogen production power source via the communication link. The system performs digital filtering to eliminate measurement noise, thereby obtaining an accurate and stable system power value. The power management control unit uses this power value as the current steady-state operating point of the system and generates a new active power setpoint. And generate new load power settings. Then, the new power setpoint is transmitted via communication link to the grid-connected photovoltaic inverter on the power generation side and the hydrogen production power source on the load side. The grid-connected photovoltaic inverter receives the new power setpoint. Then, it is used as a reference target for active power control, and the system frequency is gradually adjusted through its internal power loop. From transient value back to rated frequency At the same time, the hydrogen production power source received the communication power command. Updated to match the current frequency adjustment command. When the calculated power values ​​are equal, the two input commands in the "competitive minimum" logic tend to be consistent, and the system automatically exits the load reduction state triggered by the frequency drop and returns to the normal communication command follow mode. Thus, the system completes the entire process from power surge, transient balance to steady-state recovery, achieving highly reliable energy balance control without high real-time communication dependence.

[0028] In one embodiment, step S110 includes: S111. Obtain the active power-frequency droop characteristics of the power generation equipment; S112. Based on the active power-frequency droop characteristic, the active power-frequency adjustment curve is calculated in reverse. S113. The active power-frequency regulation curve is sent and configured to the hydrogen production equipment.

[0029] In practical engineering applications, the power generation side typically consists of multiple grid-connected photovoltaic inverters connected in parallel. Each inverter has independent active power-frequency droop control capabilities, and its control parameters may vary depending on the equipment model, capacity, or operating status. During the initial operation of the system or after a mode switch, the energy management control unit first initiates a parameter query to each power generation device via a communication link to obtain the active power-frequency droop characteristic parameters of each grid-connected photovoltaic inverter. These characteristic parameters mainly include the damping coefficient. and inertial time constant These factors together determine the inverter's frequency under power disturbances. The dynamic changes.

[0030] After acquiring the droop characteristics of each power generation device, the energy management control unit uses a weighted average method or selects parameters from the most typical device to comprehensively calculate an equivalent active-frequency droop curve that represents the dynamic characteristics of the entire power generation side. Subsequently, based on this equivalent curve, the energy management control unit calculates a matching active-frequency regulation curve. The design principle of this regulation curve is to ensure that the load-side descent response is precisely coordinated with the frequency drop characteristics of the power generation side, avoiding insufficient or over-adjustment. For example, if the droop curve on the power generation side is: The calculated load-side adjustment curve can then be set as: in, This represents the change in active power on the generation side. When sunlight weakens, the maximum power output of a photovoltaic inverter decreases; this decrease is... ,for The change in; This represents the change in active power on the load side. When the system frequency decreases, the power reduction actively achieved by the hydrogen production unit is [value missing]. Δω represents the change in the system's angular frequency. The proportional coefficient k can be set according to the system's stability margin requirements, and , This is the equivalent frequency modulation coefficient of the hydrogen production power source.

[0031] After the calculation is completed, the energy management control unit sends the parameters of the active power-frequency regulation curve to each hydrogen production unit on the load side via the communication link and configures them. Each hydrogen production unit, upon receiving the curve, stores it in its local controller as a basis for subsequent adjustments based on the system frequency. Calculate frequency regulation power command The basis for this.

[0032] This process enables the unified configuration of control strategies in a multi-device system, ensuring that each hydrogen production device can coordinate and consistently participate in transient regulation under power disturbances, thus laying the foundation for establishing system transient balance.

[0033] In one embodiment, step S120 includes: S121. When the power generation of the system changes, the automatic load reduction mode is activated by the hydrogen production power source. S122. Based on the phase-locked loop built into the hydrogen production power supply, sample the AC bus voltage of the electrical link to obtain the real-time system frequency; S123. Substitute the real-time system frequency into the active power-frequency regulation curve using the hydrogen production power source to calculate the corresponding adjustment power; S124. The adjusted power is compared with the target power when the system is in normal steady state using the hydrogen production power source, and the smaller of the two is selected as the execution power. S125. The hydrogen production power source reduces its own load power based on the execution power. When the output frequency of the inverter stops decreasing, it is determined that the system has entered a transient equilibrium.

[0034] When a power disturbance occurs in the system, such as a sudden drop in sunlight or the shutdown of some power generation equipment, the total output power on the power generation side decreases. Although the energy management control unit cannot detect this instantaneously, the disturbance will be immediately reflected in the physical state of the electrical links. At this time, the local control logic of the hydrogen production power supply automatically determines that it has entered an emergency adjustment mode and initiates an automatic load reduction mode.

[0035] The hydrogen production power supply uses a software phase-locked loop (SPLL) module built into its controller to sample the three-phase AC bus voltage signal on the electrical link in real time and calculate the real-time frequency of the current system. This frequency It is a direct reflection of the system's energy balance. The hydrogen production power source will obtain... Substituting the active power-frequency regulation curve pre-configured from the energy management control unit—which defines the mapping relationship between frequency and load power, for example, using a piecewise linear function or a continuous function—allows for the calculation of the frequency regulation power command corresponding to the current frequency. This frequency adjustment power command This refers to the target power value that needs to be reduced due to a drop in response frequency.

[0036] Subsequently, the main control unit of the hydrogen production power source executes the "competitive minimum" control logic. This logic uses the currently calculated frequency regulation power command... Communication power command received via communication link during normal steady-state operation of the system A real-time comparison is performed, and the smaller of the two values ​​is selected as the final power execution reference value. Due to the frequency drop period < ,therefore = The hydrogen production power source immediately drives its power conversion circuit to reduce the output current, thereby reducing the load power on the power grid.

[0037] As multiple hydrogen production units simultaneously reduce their load, the total system load power decreases, and power generation and load re-approach equilibrium. When the angular frequency output of the grid-connected photovoltaic inverter on the power generation side... When the continuous decline stops and the system stabilizes at a new value, it reaches a new dynamic equilibrium point. The hydrogen production power source detected... When the rate of change approaches zero, it is determined that the system has established a transient equilibrium, completing the local rapid response process. This mechanism ensures that the system autonomously recovers stability within milliseconds, greatly improving the anti-disturbance capability of the off-grid system.

[0038] Furthermore, S120 also includes: S126. When the power generation on the power generation side suddenly drops or some of the power generation equipment stops, each inverter reduces its own output frequency according to the active power-frequency droop characteristic or virtual synchronous machine characteristic to match the current power generation capacity of the power generation side.

[0039] When the system is running, if the sunlight intensity drops suddenly due to cloud cover or some photovoltaic strings fail and shut down, the total available power generation on the generation side will change abruptly. At this time, the active power setpoint output by the photovoltaic maximum power point tracking (MPPT) circuit will change. The power generation capacity will be reduced accordingly. As the power generation capacity cannot meet the original load demand, the system will experience a momentary power deficit.

[0040] At this time, each online grid-connected photovoltaic inverter acts as a voltage source, and its control system detects that the output active power matches the set value. If a deviation exists, or if a change in DC-side voltage is directly sensed, the inverter will immediately activate its built-in grid control strategy. This strategy can employ active-frequency droop control or virtual synchronous generator (VSG) control, both of which impart inertial and damping characteristics to the inverter similar to those of a traditional synchronous generator. Based on these characteristics, the inverter will actively adjust the phase angle of its internal voltage source to reduce the angular frequency of its AC output voltage. This leads to a decrease in the real-time frequency of the entire system. Decrease. For example, when there is a power deficit. As it increases, the frequency From the rated frequency Start pressing The coefficient decreased proportionally.

[0041] This frequency The decrease is not a sign of system instability, but rather an active, controlled energy matching mechanism. It acts as the sole physical signal, instantaneously transmitted to all load-side hydrogen production power sources via the electrical link. The hydrogen production power sources sense this through a phase-locked loop. Immediately after the descent, calculate the frequency regulation power command. And perform load reduction.

[0042] Therefore, the generator-side inverter reduces the output frequency. The system is informed of insufficient energy, while the load side receives the instruction via frequency signal and actively reduces its load. Together, they work to propel the system towards a new power equilibrium point. When the reduction in load power matches the reduction in generation power, the frequency... The decline stopped, and the system entered a stable state. The frequency regulation of the generator-side inverter, based on its active power-frequency droop characteristics or virtual synchronous machine characteristics, is the source and key link that triggers the rapid response on the load side and ultimately establishes the transient balance of the system.

[0043] In one embodiment, step S130 includes: S131a. If the power generation on the power generation side suddenly drops, the actual active power of the hydrogen production equipment is read and filtered to obtain the current active power. S132a. The actual active power is used as the new active power setting value and sent to the inverter and the hydrogen production power source.

[0044] When the system enters a transient state due to a sudden drop in sunlight, each grid-type photovoltaic inverter reduces its output frequency according to its active power-frequency droop characteristics. Each hydrogen production power source autonomously reduces its load through a "competitive minimum" logic, ultimately lowering the system frequency. Once the decline stops and the system stabilizes at a new value, it enters a transient equilibrium state. At this point, the system's active power supply and demand are matched, but the operating frequency is lower than the rated value.

[0045] The power control unit continuously monitors the system status through the communication link and determines the system frequency. Once the rate of change approaches zero and the system has entered a stable operating range, the steady-state recovery procedure is initiated. First, the energy management control unit periodically reads the actual active power reported by each hydrogen production unit via the communication link. .because There may be measurement noise or transient fluctuations. The power control unit applies a first-order low-pass filter or moving average filter to obtain a smooth, accurate, and stable system power value. .Should This is the actual total power that the system can operate stably for a long time under the current lighting conditions.

[0046] Subsequently, the energy management control unit will As a new target value, a unified active power setpoint is generated. . It includes both the power target on the generation side and the power target on the load side. The energy management control unit transmits this through a communication link. Simultaneously, the power setpoints were distributed to all grid-connected photovoltaic inverters on the power generation side, and the corresponding load power setpoints were also transmitted. The message was sent to all hydrogen production power sources. The inverters received it. Then, it is used as a reference command for its own active power control, and the system frequency is gradually increased by adjusting its virtual synchronizer or droop control power loop. Until it returns to the rated angular frequency. Meanwhile, the hydrogen production power source received the updated... This value is different from the current value calculated based on frequency. Since the power outputs are equal, the "competitive selection" logic no longer plays a dominant role. The hydrogen production power source smoothly exits the automatic load reduction mode, and the system enters a new power level. The new steady state is achieved at the rated operating frequency.

[0047] In one embodiment, step S130 includes: S131b If some of the power generation equipment is shut down, the total power setting value of the shut-down power generation equipment is identified, and the actual active power of the hydrogen production equipment is obtained by reading and filtering. S132b: The difference between the current actual active power of the hydrogen production equipment and the total power setting value of the power generation equipment that has been shut down is used as the new active power setting value and sent to the inverter and the hydrogen production power source.

[0048] When some grid-connected photovoltaic inverters in the system experience uncontrolled shutdown, their corresponding power generation capacity is instantly lost. Unlike a sudden drop in overall sunlight, in this scenario, the remaining online inverters can still maintain their original maximum power output capacity, but the total power generation capacity of the system is reduced.

[0049] During the transient process, a shutdown event causes a power deficit in the system, and the remaining inverter reduces its output frequency based on its active-frequency droop characteristic. Each hydrogen production power source senses the frequency. Decrease, calculate frequency adjustment power command The system then implemented load reduction, eventually stopping the frequency decline and entering a transient equilibrium state. At this point, the energy management control unit first detected offline equipment via the communication link, identified the shut-down generator, and obtained its active power setpoint before shutdown. All equipment that has been shut down Summing yields the total power setpoint of the stopped equipment. The energy management control unit reads the actual active power reported by all current hydrogen production equipment through the communication link. The system then filters the load to obtain a stable total power output for the current load. .

[0050] Because the load reduction of the hydrogen production equipment during the transient process is calculated based on the total system power deficit, while the actual power generation capacity of the remaining photovoltaic equipment does not decrease, therefore, the load reduction is directly applied... Using this as the new system target value would lead to excessive system power and an over-boosted frequency. To correct this deviation, the power control unit performs a correction calculation: adjusting the current actual load power after filtering. Subtract the total power setting of the stopped equipment The resulting difference represents the reasonable load power that the remaining photovoltaic system should bear, and serves as the new active power setpoint. Right now; The power control unit will Simultaneously, the signal is sent to the remaining online grid-connected photovoltaic inverters and all hydrogen production power sources. The inverters adjust their output accordingly, restoring the system frequency to its rated value. The hydrogen production power source receives the current Consistent After exiting the load reduction mode, the system enters a new steady-state operating point. This method accurately compensates for the capacity loss caused by equipment shutdown and avoids secondary power imbalance during the recovery process.

[0051] In one embodiment, step S130 includes: S133. The inverter adjusts the output power according to the new active power setting value to raise the system frequency back to the rated frequency. S134. When the hydrogen production power source receives a new active power setting value that is the same as the executed power value, it exits the automatic load reduction mode.

[0052] The power management control unit calculates new active power setpoints based on two operating conditions: "sudden drop in power generation" or "partial equipment shutdown". or Then, this setting is transmitted via communication link to the grid-connected photovoltaic inverter on the power generation side and the hydrogen production power source on the load side. The following will uniformly refer to... or by express.

[0053] Each online inverter received the new active power setpoint. Then, it is used as the reference input for the active power control loop. The inverter's control system uses this... Compared with its actual output power To address the deviation, the power-frequency relationship of the internal virtual synchronizer or droop control module is adjusted to actively increase the output active power, thereby gradually increasing the angular frequency of the output voltage. Due to the coordinated response of all inverters, the real-time frequency of the entire system... It was pulled back to the rated frequency from the lower value during transient equilibrium. The system voltage and frequency returned to standard operating conditions.

[0054] At the same time, each hydrogen production power source receives the updated load power setting. During the transient process, the operating power of the hydrogen production power source... This is determined by the logic of "competition for the smallest advantage," that is: at this time < The system is in automatic load reduction mode. As the system frequency recovers, Gradually recovering, and newly issued Set to be consistent with the current Equal values. When the hydrogen production power source detects... = When the two input commands are consistent, the "competitive minimum" logic no longer generates load reduction commands, and the hydrogen production power supply automatically exits the automatic load reduction mode and switches to completely following the commands sent through the communication link. Operation complete. At this point, the system has completed the entire process from transient imbalance to steady state at rated frequency, achieving dual recovery of energy balance and operating parameters.

[0055] The off-grid green electricity hydrogen production power control method of this invention breaks through the dependence of traditional control strategies on high real-time communication and accurate power prediction. Through a hierarchical collaborative control architecture of autonomous response of electrical links and collaborative recovery of communication links, it effectively solves the problem of rapid energy balance in off-grid systems without energy storage when facing photovoltaic power generation fluctuations and equipment failures, and significantly improves the autonomy, robustness and reliability of the system.

[0056] This technology can be widely applied in remote areas, islands, border outposts, and other scenarios where the power grid is difficult to cover, enabling on-site energy extraction and hydrogen production, providing a reliable solution for distributed hydrogen energy supply. Simultaneously, its control principles can be extended to complex off-grid microgrid scenarios such as integrated wind, solar, and hydrogen systems and offshore wind power hydrogen production platforms, providing key technical support for the stable operation of high-proportion renewable energy systems. With the widespread adoption of grid-connected converters and intelligent control technologies, this method is easy to engineer and highly compatible, laying a solid technical foundation for the large-scale and commercial application of green electricity-to-hydrogen projects, and promoting the low-carbon and intelligent development of the hydrogen energy industry chain.

[0057] Figure 8 This is a schematic block diagram of an off-grid green electricity hydrogen production power control device 600 provided in an embodiment of the present invention. Figure 8 As shown, corresponding to the above-described off-grid green electricity hydrogen production power control method, the present invention also provides an off-grid green electricity hydrogen production power control device 600. This off-grid green electricity hydrogen production power control device 600 includes a unit for executing the above-described off-grid green electricity hydrogen production power control method, and the device can be configured in a desktop computer, tablet computer, smartphone, or other terminal.

[0058] Specifically, please refer to Figure 8 The off-grid green electricity hydrogen production power control device 600 includes: The adjustment curve configuration unit 610 is used to obtain the active power-frequency droop characteristic of the power generation side, calculate the active power-frequency adjustment curve based on the active power-frequency droop characteristic, and configure it to the load side. The transient balance establishment unit 620 is used to adjust the active power on the load side based on the real-time system frequency and the active power-frequency regulation curve when the power generation of the system changes, and to establish the transient balance of the system. The active power regulation unit 630 is used to obtain the stable system power of the system after the system transient balance is established, and to synchronously adjust the active power setting value of the generation side and the active power setting value of the load side according to the stable system power.

[0059] In one embodiment, the adjustment curve configuration unit 610 includes: A droop characteristic acquisition unit is used to acquire the active-frequency droop characteristic of the power generation equipment. The adjustment curve calculation unit is used to calculate the active-frequency adjustment curve in reverse based on the active-frequency droop characteristic. The adjustment curve sending unit is used to send and configure the active power-frequency adjustment curve to the hydrogen production equipment.

[0060] Furthermore, the transient equilibrium establishment unit 620 includes: An automatic load reduction start-up unit is used to initiate an automatic load reduction mode via the hydrogen production power source when the power generation capacity of the system changes. The real-time system frequency acquisition unit is used to sample the AC bus voltage of the electrical link based on the phase-locked loop built into the hydrogen production power supply to acquire the real-time system frequency; The corresponding adjustment power calculation unit is used to substitute the real-time system frequency into the active power-frequency regulation curve through the hydrogen production power source to calculate the corresponding adjustment power. The competitive selection unit is used to compare the adjusted power with the target power when the system is in normal steady state through the hydrogen production power source, and select the smaller of the two as the execution power; The transient balance determination unit is used to reduce its own load power based on the execution power through the hydrogen production power source, and determine that the system has entered transient balance when the output frequency of the inverter stops decreasing.

[0061] Furthermore, the transient equilibrium establishment unit 620 also includes: The power generation capacity matching unit is used to match the current power generation capacity of the power generation side by reducing the output frequency of each inverter according to the active power-frequency droop characteristic or virtual synchronous machine characteristic when the power generation power on the power generation side suddenly drops or some of the power generation equipment stops.

[0062] In one embodiment, the active power regulation unit 630 includes: The power generation drop status unit is used to read and filter the actual active power of the hydrogen production equipment if the power generation on the power generation side drops suddenly. The first active power setting unit is used to set the actual active power as the new active power setting value and send it to the inverter and the hydrogen production power source.

[0063] In one embodiment, the active power regulation unit 630 includes: The power generation equipment shutdown status unit is used to identify the total power set value of the shut-down power generation equipment if some of the power generation equipment is shut down, and to read and filter to obtain the current actual active power of the hydrogen production equipment. The second active power setting unit is used to take the difference between the current actual active power of the hydrogen production equipment and the total power setting value of the power generation equipment that has been shut down, and send it to the inverter and the hydrogen production power supply.

[0064] In one embodiment, the active power regulation unit 630 further includes: The system frequency pull-back unit is used to adjust the output power of the inverter according to the new active power setting value to pull the system frequency back to the rated frequency. The automatic load reduction exit unit is used to exit the automatic load reduction mode when the hydrogen production power source receives a new active power setting value that is the same as the executed power value.

[0065] The aforementioned off-grid green electricity hydrogen production power control device 600 can be implemented as a computer program, which can, for example... Figure 9 It runs on the computer device shown.

[0066] Please see Figure 9 , Figure 9 This is a schematic block diagram of a computer device 500 provided in an embodiment of this application. The computer device 500 can be a terminal or a server. The terminal can be an electronic device with communication functions, such as a desktop computer, tablet computer, or smartphone. The server can be a standalone server or a server cluster composed of multiple servers.

[0067] See Figure 9 The computer device 500 includes a processor 502, a memory, and a network interface 505 connected via a system bus 501. The memory may include a non-volatile storage medium 503 and internal memory 504.

[0068] The non-volatile storage medium 503 may store an operating system 5031 and a computer program 5032. The computer program 5032 includes program instructions that, when executed, cause the processor 502 to perform an off-grid green electricity hydrogen production power control method.

[0069] The processor 502 provides computing and control capabilities to support the operation of the entire computer device 500.

[0070] The internal memory 504 provides an environment for the operation of the computer program 5032 in the non-volatile storage medium 503. When the computer program 5032 is executed by the processor 502, the processor 502 can execute an off-grid green electricity hydrogen production power control method.

[0071] This network interface 505 is used for network communication with other devices. Those skilled in the art will understand that... Figure 9 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device 500 to which the present application is applied. The specific computer device 500 may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0072] The processor 502 is used to run a computer program 5032 stored in a memory to implement the steps of the above method.

[0073] It should be understood that in the embodiments of this application, the processor 502 may be a central processing unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0074] It will be understood by those skilled in the art that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program includes program instructions and can be stored in a storage medium, which is a computer-readable storage medium. The program instructions are executed by at least one processor in the computer system to implement the process steps of the embodiments of the above methods.

[0075] Therefore, the present invention also provides a storage medium. This storage medium can be a computer-readable storage medium. The storage medium stores a computer program, wherein the computer program includes program instructions. When executed by a processor, the program instructions cause the processor to perform the steps of the above-described method.

[0076] The storage medium can be any computer-readable storage medium capable of storing program code, such as a USB flash drive, portable hard drive, read-only memory (ROM), magnetic disk, or optical disk.

[0077] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0078] In the several embodiments provided by this invention, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of each unit is only a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0079] The steps in the method of this invention can be adjusted, merged, or reduced in order according to actual needs. The units in the device of this invention can be merged, divided, or reduced according to actual needs. Furthermore, the functional units in the various embodiments of this invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0080] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, a terminal, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention.

[0081] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for off-grid green electricity hydrogen production power control, characterized in that, The application is applied to an off-grid green electricity hydrogen production system, including a power generation side, a load side and an electrical link, the power generation side and the load side are electrically connected through the electrical link, and the method comprises: Obtaining the active-frequency droop characteristic of the power generation side, calculating the active-frequency regulation curve based on the active-frequency droop characteristic, and configuring to the load side; When the power generation power of the system changes, adjusting the active power of the load side based on the real-time system frequency of the system and the active-frequency regulation curve, and establishing system transient balance; After the system transient balance is established, obtaining the stable system power of the system, and synchronously adjusting the active power set value of the power generation side and the active power set value of the load side according to the stable system power.

2. The off-grid green electricity hydrogen production power control method according to claim 1, characterized in that, The power generation side comprises a plurality of power generation devices, the load side comprises a plurality of hydrogen production devices, and the step of obtaining the active-frequency droop characteristic of the power generation side, calculating the active-frequency regulation curve based on the active-frequency droop characteristic, and configuring to the load side comprises: Obtaining the active-frequency droop characteristic of the power generation device; According to the active-frequency droop characteristic, the active-frequency regulation curve is reversely calculated; The active-frequency regulation curve is sent to the hydrogen production device.

3. The off-grid green electricity hydrogen production power control method according to claim 2, characterized in that, The hydrogen production device comprises a hydrogen production power supply, the power generation device comprises an inverter, and the step of adjusting the active power of the load side based on the real-time system frequency of the system and the active-frequency regulation curve when the power generation power of the system changes, and establishing system transient balance comprises: When the power generation power of the system changes, starting the automatic load reduction mode through the hydrogen production power supply; The real-time system frequency is obtained by sampling the AC bus voltage of the electrical link based on the phase-locked loop built in the hydrogen production power supply; The real-time system frequency is substituted into the active-frequency regulation curve through the hydrogen production power supply, and the corresponding adjustment power is calculated; The adjustment power is compared with the target power when the system is in normal steady state through the hydrogen production power supply, and the smaller one of the two is selected as the execution power; The load power of the hydrogen production power supply is reduced based on the execution power, and when the output frequency of the inverter stops decreasing, it is determined that the system transient balance is entered.

4. The off-grid green electricity hydrogen production power control method according to claim 3, characterized in that, The power generation device comprises an inverter, and the step of adjusting the active power of the load side based on the real-time system frequency of the system and the active-frequency regulation curve when the power generation power of the system changes, and establishing system transient balance further comprises: When the power generation power of the power generation side suddenly drops or part of the power generation devices are shut down, the output frequency of each inverter is reduced according to the active-frequency droop characteristic or the virtual synchronous machine characteristic, so as to match the current power generation capacity of the power generation side.

5. The off-grid green power to hydrogen power control method of claim 4, wherein, The step of obtaining the stable system power of the system and synchronously adjusting the active power set value of the power generation side and the active power set value of the load side according to the stable system power comprises: If the power generation power of the power generation side suddenly drops, the current actual active power of the hydrogen production device is read and filtered. The actual active power is taken as a new active power set value and is sent to the inverter and the hydrogen production power source.

6. The off-grid green power to hydrogen power control method of claim 4, wherein, The step of obtaining the stable system power of the system and synchronously adjusting the active power set value of the power generation side and the active power set value of the load side according to the stable system power comprises: If some of the power generation equipment is shut down, the total power set value of the power generation equipment that has been shut down is identified, the actual active power of the hydrogen production equipment at present is read and filtered to obtain; The difference between the actual active power of the hydrogen production equipment at present and the total power set value of the power generation equipment that has been shut down is taken as a new active power set value and is sent to the inverter and the hydrogen production power source.

7. The off-grid green hydrogen production power control method according to claim 5 or 6, characterized in that, The step of obtaining the stable system power of the system and synchronously adjusting the active power set value of the power generation side and the active power set value of the load side according to the stable system power further comprises: The system frequency is pulled back to the rated frequency by the inverter according to the new active power set value. When the hydrogen production power source receives the new active power set value that is the same as the execution power value, the automatic load shedding mode is exited.

8. A kind of off-grid green electricity hydrogen production power control device, it is characterized in being, A computer device for executing the off-grid green electricity hydrogen production power control method according to any one of claims 1 to 7.

9. A computer device, comprising: The computer device comprises a memory and a processor connected to the memory; the memory is used to store a computer program; and the processor is used to run the computer program stored in the memory to execute the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, and the computer program comprises program instructions which, when executed by a processor, can implement the steps of the method according to any one of claims 1 to 7.

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