Multi-energy complementary'fire-light-storage-hydrogen 'park power distribution network system and control method

Abstract

The invention relates to the technical field of new energy, in particular to a multi-energy complementary'fire-light-storage-hydrogen 'park power distribution network system and a control method, and the'fire-light-storage-hydrogen' park power distribution network system is composed of a distributed fire-light complementary power generation system, an energy storage adjusting system, a hydrogen production circulating system and an electrical load; under the two working modes of conventional operation and isolated island operation, electric power is optimized and adjusted through a multi-energy complementary'fire-light-storage-hydrogen 'park power distribution network system, and the purposes of electric power balance, stable voltage and frequency of the power distribution network, reliable power supply and electric energy quality optimization are achieved. Distributed thermal power generation and distributed photovoltaic power are combined as power supplies and assist the energy storage adjusting system to form a power supply, so that advantage complementation of traditional energy and new energy is achieved. The distributed flame-light complementary power generation system, the energy storage adjusting system and the hydrogen production circulating system are matched with one another, hydrogen production through excess energy can be achieved, hydrogen energy can be recycled to form hydrogen storage energy, and multi-energy complementation and cyclic utilization are fully achieved.

Description

Technical Field

[0001] This application relates to the field of new energy technologies, and particularly to a multi-energy complementary "thermal - photovoltaic - energy storage - hydrogen" park distribution network system and a control method therefor. Background Art

[0002] With the global energy structure transforming towards cleaner and lower - carbon forms, park distribution networks are gradually developing towards multi - energy complementarity and intelligent regulation. Traditional energy systems mainly rely on thermal power generation, supplemented by new energy sources such as photovoltaic power.

[0003] In related technologies, although thermal power, photovoltaic power, and energy storage are integrated, each energy unit mostly operates independently, lacking a dynamic coordination mechanism. For example, the output of photovoltaic power fluctuates greatly due to weather conditions, and the adjustment response of thermal power is slow, resulting in insufficient power supply stability; the energy storage system (such as lithium batteries, supercapacitors) and the hydrogen energy system do not form cross - time - scale coordination, and cannot balance the requirements of instantaneous frequency modulation and long - term energy storage. When the park distribution network operates independently from the main grid, traditional solutions rely on diesel generators or single energy storage devices, which have problems such as response delays and low adjustment accuracy, and are difficult to meet the requirements of high - reliability power supply. Therefore, existing technologies are difficult to achieve efficient coordination of thermal power, photovoltaic power, energy storage, and hydrogen energy, have insufficient power supply stability in the island mode, low hydrogen energy recycling efficiency, and lagging intelligent control means. Summary of the Invention

[0004] This application provides a multi - energy complementary "thermal - photovoltaic - energy storage - hydrogen" park distribution network system and a control method therefor to solve the problems in related technologies such as difficulty in achieving efficient coordination of thermal power, photovoltaic power, energy storage, and hydrogen energy, insufficient power supply stability in the island mode, low hydrogen energy recycling efficiency, and lagging intelligent control means.

[0005] To achieve the above object, in a first - aspect embodiment of this application, a multi - energy complementary "thermal - photovoltaic - energy storage - hydrogen" park distribution network system is provided, including: a power generation system, wherein the power generation system includes a distributed thermal - photovoltaic complementary power generation system composed of distributed thermal power generation units and photovoltaic power generation units, and generates power based on the distributed thermal power generation units and photovoltaic power generation units; an energy storage regulation system for calling corresponding energy storage systems to perform corresponding power generation, hydrogen energy storage, or distribution network voltage and power balance operations under different target operating modes; a hydrogen production cycle system that uses the electric energy stored in the energy storage regulation system to produce hydrogen, stores the hydrogen in hydrogen tanks to convert it into hydrogen energy, and uses the stored hydrogen energy to adjust the distribution network voltage and power balance; a control system that acquires the load data of the park distribution network, determines the target operating mode of the park distribution network according to the load data, and adjusts the power generation system, the energy storage regulation system, and the hydrogen production cycle system according to the target operating mode.

[0006] Optionally, the energy storage regulation system includes a first energy storage system, a second energy storage system, and a third energy storage system. Among them, the first energy storage system is composed of a lithium iron phosphate battery pack, the second energy storage system is composed of a nickel-metal hydride battery pack, and the third energy storage system is composed of a supercapacitor bank.

[0007] Optionally, the first energy storage system is used to: when the distribution network is in normal operation mode, adjust the total current output of the lithium iron phosphate battery in the first energy storage system, smooth the power output of the power generation system, and make the output voltage of the power generation system approach sinusoidal alternating current.

[0008] Optionally, the second energy storage unit is connected to the electrolytic water hydrogen production device, and is used to store excess electric energy in the second energy storage system and start the hydrogen production cycle to convert it into hydrogen energy storage during the load valley period in the normal operation mode of the distribution network.

[0009] Optionally, the third energy storage unit is used to adjust the power balance when the distribution network is in island operation mode.

[0010] The second aspect of the embodiments of the present application provides a control method for a multi-energy complementary "thermal - photovoltaic - energy storage - hydrogen" park distribution network system. The method is implemented by applying the multi-energy complementary "thermal - photovoltaic - energy storage - hydrogen" park distribution network system described in the above embodiments. The method includes the following steps: obtaining the load data of the park distribution network; determining the target operation mode of the park distribution network according to the load data; scheduling the power generation system, the energy storage regulation system, and the hydrogen production cycle system according to the target operation mode.

[0011] Optionally, the scheduling of the power generation system, the energy storage regulation system, and the hydrogen production cycle system according to the target operation mode includes: if the target operation mode is the normal operation mode, the power generation system, the energy storage regulation system, and the hydrogen production cycle system generate electricity; if the target operation mode is the island operation mode, the third energy storage system of the energy storage regulation system is used to adjust the active power balance and the SVG (Static Var Generator) is used to adjust the reactive power balance.

[0012] Optionally, the step of if the target operation mode is the normal operation mode, the power generation system, the first energy storage system of the energy storage regulation system, and the hydrogen production cycle system generate electricity includes: if the current moment is in the peak electricity consumption period, the power generation system and the energy storage regulation system are used to generate electricity, and the excess electric energy is stored in the second energy storage unit of the energy storage regulation system; if the current moment is in the valley electricity consumption period, the excess electric energy is stored in the second energy storage unit to produce hydrogen and store it in the hydrogen tank to form hydrogen energy storage.

[0013] Optionally, before adjusting the active power and reactive power balance through the third energy storage system, it includes: detecting whether the output frequency and output voltage of the distribution network deviate from the corresponding preset safety range; if the output frequency and the output voltage deviate from the preset safety range, calculating the change value of the active power and the change value of the reactive power; adjusting the active power according to the change value of the frequency, and adjusting the reactive power according to the change value of the voltage until the output frequency and the output voltage are within the preset safety range; the voltage regulation system assists in adjusting the voltage magnitude.

[0014] Optionally, the calculation formula for the change value of the active power is:

[0015]

[0016] Where Δp is the change value of the active power of the capacitor bank, is the frequency change rate of the capacitor bank, θ is the proportion of the capacitor bank participating in frequency modulation, f n is the rated frequency, and ΔE is the power change value of the capacitor bank.

[0017] Optionally, the calculation formula for the change value of the output voltage is:

[0018]

[0019] Where X is the line reactance, Q is the reactive power, V is the output voltage of the distribution network, and β is the proportion of the SVG participating in voltage regulation.

[0020] Optionally, after adjusting the reactive power balance through the SVG, it includes:

[0021] Adjust the opening and closing of the thyristor by combining the strong electricity and the weak electricity to adjust the voltage amplitude; the voltage control system monitors the voltage amplitude in real time and calculates the optimal value of the voltage amplitude adjustment; control the opening and closing of the thyristor to select the corresponding turns ratio of the transformer, adjust the voltage stability, and at the same time adjust the reactive power to maintain the reactive power balance. The specific steps are:

[0022] Obtain the voltage parameters, current parameters, and power parameters of each node of the distribution network; analyze whether the current voltage level deviates from the set safety range according to the voltage parameters, current parameters, and power parameters; if the current voltage level deviates from the set safety range, use an optimization algorithm to calculate the corresponding voltage adjustment amount and the optimal configuration of the transformer turns ratio; control the energy storage regulation system to send instructions to the thyristor to adjust the trigger angle of the thyristor, or fully turn on / off the thyristor; determine the turns ratio of the transformer according to the voltage adjustment amount and the optimal configuration of the transformer turns ratio, and adjust the turns ratio between the primary winding and the secondary winding according to the turns ratio of the transformer. After each adjustment, monitor the voltage change again to ensure that the current voltage level is within the safety range.

[0023] Accordingly, the present application has at least the following beneficial effects:

[0024] The embodiment of the present application consists of a distributed fire-light power generation system, an energy storage regulation system, a hydrogen production cycle system, and an electrical load to form a "fire-light-storage-hydrogen" park distribution network; under two working modes of normal operation and island operation, through the regulation system of the "fire-light-storage-hydrogen" park distribution network to optimize the regulation of electric power, the purpose of achieving electric power balance, stable distribution network voltage and frequency, reliable power supply, and optimizing power quality is realized; when distributed thermal power generation and distributed photovoltaic are combined as power sources and assisted by an energy storage regulation unit to form a power supply, the advantages of traditional energy and new energy can be complementary, and energy storage plays different roles in different "fire-light-storage-hydrogen" distribution networks; the distributed fire-light power generation system, the energy storage regulation system, and the hydrogen production cycle system cooperate with each other to realize hydrogen production with excess energy, hydrogen energy recovery and utilization to form hydrogen energy storage, and fully realize multi-energy complementarity.

[0025] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the drawings, in which:

[0027] Figure 1 FIG. is a schematic diagram of the overall structure of a multi-energy complementary "fire-light-storage-hydrogen" park distribution network system provided according to an embodiment of the present application;

[0028] Figure 2 FIG. is a schematic diagram of the specific structure of the energy storage regulation system of the multi-energy complementary "fire-light-storage-hydrogen" park distribution network system provided according to an embodiment of the present application;

[0029] Figure 3 FIG. is a schematic diagram of the specific structure of the voltage regulation system of the multi-energy complementary "fire-light-storage-hydrogen" park distribution network system provided according to an embodiment of the present application;

[0030] Figure 4 FIG. is a flowchart of the control method of the multi-energy complementary "fire-light-storage-hydrogen" park distribution network system provided according to an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application.

[0032] The multi - energy complementary "thermal - photovoltaic - energy storage - hydrogen" park distribution network system and control method according to the embodiments of the present application will be described below with reference to the accompanying drawings.

[0033] Figure 1 It is a schematic diagram of the overall structure of a multi - energy complementary "thermal - photovoltaic - energy storage - hydrogen" park distribution network system provided by the embodiments of the present application.

[0034] As Figure 1 shown, the multi - energy complementary "thermal - photovoltaic - energy storage - hydrogen" park distribution network system includes:

[0035] A power generation system, where the power generation system includes a distributed thermal - photovoltaic complementary power generation system composed of distributed thermal power generation units and photovoltaic power generation units, and generates electricity based on the distributed thermal power generation units and photovoltaic power generation units.

[0036] An energy storage regulation system, which is used to call the corresponding energy storage system to perform corresponding power generation, hydrogen energy storage, or distribution network voltage and power balance operations under different target operating modes.

[0037] A hydrogen production cycle system, which uses the electric energy stored in the energy storage regulation system to produce hydrogen, stores the hydrogen in a hydrogen tank to convert it into hydrogen energy, and uses the stored hydrogen energy to regulate the distribution network voltage and power balance.

[0038] A control system, which acquires the load data of the park distribution network, determines the target operating mode of the park distribution network according to the load data, and adjusts the power generation system, energy storage regulation system, and hydrogen production cycle system according to the target operating mode.

[0039] It should be noted that the thermal power generation unit is mainly responsible for providing a stable power output when solar energy resources are unavailable or insufficient, which usually includes traditional energy facilities such as gas turbines or coal - fired power plants; the photovoltaic power generation unit mainly uses solar photovoltaic technology to convert solar radiation into electric energy, and this clean energy can generate a large amount of electricity during the day, especially when the sun is shining brightly.

[0040] The energy storage regulation system is not only used to store excess electric energy, such as the daytime peak from the photovoltaic power generation unit, but also can enhance the grid stability in the following ways: (1) Frequency regulation: quickly respond to the frequency fluctuations in the power grid to help maintain the power grid frequency stability; (2) Voltage support: provide reactive power support by adjusting the charge - discharge state of the energy storage device, thereby maintaining the power grid voltage level.

[0041] The control system can determine the best operating mode and resource allocation strategy based on real - time load data and prediction models. Considering multiple factors such as cost, environmental impact, and reliability, it searches for the optimal solution to meet the requirements on different time scales and makes rapid adjustments according to the actual situation.

[0042] Specifically, through multi-energy complementarity, intelligent control, and a hydrogen energy closed-loop, not only can the collaborative optimization of power supply reliability, energy efficiency, and environmental friendliness be achieved, improving energy utilization efficiency and reducing dependence on a single energy source, but also the balance of electric power, the stability of the distribution network voltage and frequency, reliable power supply, and the optimization of power quality can be realized.

[0043] As Figure 2 shown, in the embodiment of the present application, the energy storage regulation system includes a first energy storage system, a second energy storage system, and a third energy storage system. Among them, the first energy storage system is composed of a lithium iron phosphate battery pack, the second energy storage system is composed of a nickel-metal hydride battery pack, and the third energy storage system is composed of a supercapacitor bank.

[0044] Specifically, the first energy storage system is used to: when the distribution network is in normal operation mode, adjust the total current output of the lithium iron phosphate battery pack in the first energy storage system to smooth the power output of the power generation system, so that the output voltage of the power generation system approaches sinusoidal alternating current. The second energy storage unit is connected to the electrolytic water hydrogen production device and is used to store excess electric energy in the second energy storage system and start the hydrogen production cycle to convert it into hydrogen energy storage during the load trough period in the normal operation mode of the distribution network. The third energy storage unit is used to adjust the electric power balance when the distribution network is in island operation mode.

[0045] It should be noted that since the first energy storage system smooths the power output of the power generation system by adjusting the total current output of the lithium iron phosphate battery pack, ensuring that the output voltage of the power generation system is as close as possible to the ideal sinusoidal alternating current waveform. Among them, the lithium iron phosphate battery has a long service life, high safety, and good charge and discharge efficiency, which helps to improve power quality and reduce the impact on the power grid.

[0046] The second energy storage system is mainly used to store excess electric energy during the load trough period and support the operation of the hydrogen production cycle system. Among them, the nickel-metal hydride battery has good durability and high energy density, which is suitable for long-term energy storage. When the power grid is in normal operation mode and the load is low, the second energy storage system will collect excess electric energy and use it to start the electrolytic water hydrogen production device to convert the electric energy into hydrogen energy for storage, which not only solves the problem of waste of electric energy during off-peak hours but also provides an effective long-term energy storage method for the power grid, increasing the diversity of energy storage and facilitating the implementation of a more flexible energy management strategy.

[0047] The third energy storage system is particularly suitable for coping with emergencies or the rapid response requirements in island operation mode. Among them, the supercapacitor can charge and discharge extremely quickly and is very suitable for power compensation within a short time. When the distribution network enters the island operation mode, the third energy storage system quickly adjusts the electric power balance to ensure the continuity and safety of the power supply for critical loads.

[0048] The multi-energy complementary "thermal - photovoltaic - energy storage - hydrogen" campus distribution network system proposed according to the embodiments of the present application consists of a distributed thermal and photovoltaic power generation system, an energy storage regulation system, a hydrogen production cycle system, and an electrical load to form a "thermal - photovoltaic - energy storage - hydrogen" campus distribution network. Under two working modes of normal operation and island operation, through the regulation system of the "thermal - photovoltaic - energy storage - hydrogen" campus distribution network to optimize the regulation of electric power, the purpose of achieving electric power balance, stability of the distribution network voltage and frequency, reliable power supply, and optimized power quality is realized. When distributed thermal power generation and distributed photovoltaic are combined as power sources and assisted by an energy storage regulation unit to form a power supply, the complementary advantages of traditional energy and new energy can be realized, and the energy storage plays different roles in different "thermal - photovoltaic - energy storage - hydrogen" distribution networks. The distributed thermal and photovoltaic power generation system, the energy storage regulation system, and the hydrogen production cycle system cooperate with each other to enable the production of hydrogen from excess energy, the recovery and utilization of hydrogen energy to form hydrogen energy storage, and fully realize multi-energy complementarity.

[0049] Figure 4 It is a flowchart of the control method for the multi-energy complementary "thermal - photovoltaic - energy storage - hydrogen" campus distribution network system according to the embodiments of the present application.

[0050] As Figure 4 shown, the control method for the multi-energy complementary "thermal - photovoltaic - energy storage - hydrogen" campus distribution network system is implemented by applying to the multi-energy complementary "thermal - photovoltaic - energy storage - hydrogen" campus distribution network in the above embodiments. The method includes the following steps:

[0051] Step S101, obtain the load data of the campus distribution network.

[0052] It should be noted that the present application can collect real-time power consumption information through smart meters and other monitoring devices installed in the campus distribution network. These data include, but are not limited to, the electricity consumption in each period, peak load time, average load, etc., and use Internet of Things technology and big data analysis platforms to process and analyze these data to obtain accurate load curves and trend predictions.

[0053] Step S102, determine the target operation mode of the campus distribution network according to the load data.

[0054] It should be noted that the target operation mode includes a normal operation mode and an island operation mode.

[0055] Specifically, according to the data collected in step S101, identify the high load period, low load period, and possible peak demands; combine weather forecasts (for cases relying on solar energy), historical data, and the current system state to evaluate the most suitable operation mode in different time periods.

[0056] Step S103, dispatch the power generation system, the energy storage regulation system, and the hydrogen production cycle system according to the target operation mode.

[0057] Specifically, (1) Power generation system: Adjust the operating parameters of the thermal power generation unit and the photovoltaic power generation unit. For example, increase the thermal power generation output during high load periods, and maximize the photovoltaic power generation efficiency during sunny days.

[0058] (2) Energy storage regulation system: Determine whether to charge or discharge the first, second, or third energy storage system according to the load situation. For example, charge the nickel-metal hydride battery pack during low load periods and initiate the hydrogen production process; release the energy of the lithium iron phosphate battery pack during high load to smooth the load.

[0059] (3) Hydrogen production cycle system: Usually initiate the hydrogen production process during low load periods, convert the excess electrical energy into hydrogen energy for storage, so as to be used as backup energy or for peak shaving in the future.

[0060] In the embodiments of the present application, control the power generation system, the energy storage regulation system, and the hydrogen production cycle system according to the target operating mode, including: If the target operating mode is the normal operating mode, the power generation system, the energy storage regulation system, and the hydrogen production cycle system generate electricity; if the target operating mode is the island operating mode, adjust the active power balance through the third energy storage system of the energy storage regulation system and adjust the reactive power balance through the SVG.

[0061] Specifically, the normal operating mode:

[0062] (1) Power generation system: In the normal operating mode, the thermal power generation unit and the photovoltaic power generation unit are adjusted according to the load demand. For example, give priority to using solar power generation during the day, and increase the thermal power generation output at night or when the weather conditions are poor.

[0063] (2) Energy storage regulation system: The first energy storage system (lithium iron phosphate battery pack) is used to smooth the output of the power generation system and ensure the stability of the grid voltage. The second energy storage system (nickel-metal hydride battery pack) stores the excess electrical energy during low load periods and initiates the electrolytic water hydrogen production device to convert the electrical energy into hydrogen energy for storage. The third energy storage system (supercapacitor bank) is used as a backup in this mode to prepare for any emergencies.

[0064] (3) Hydrogen production cycle system: Use the electrical energy stored in the second energy storage system for water electrolysis to produce hydrogen, and the produced hydrogen can be stored and converted back into electrical energy when needed.

[0065] Island operating mode:

[0066] (1) Energy storage regulation system: In the island mode, the third energy storage system (supercapacitor bank) plays a key role, quickly responds and adjusts the active power balance to maintain the stable operation of the grid. The static var generator is used to adjust the reactive power in real time, maintain the grid voltage level, and ensure the power supply quality.

[0067] (2) Other systems: Since the island mode is usually for dealing with emergencies or unplanned power outages, the operations of the power generation system and the hydrogen production cycle system may be restricted. The focus is on maintaining the existing energy reserves and minimizing unnecessary energy consumption.

[0068] In the embodiment of the present application, if the target operation mode is the normal operation mode, the power generation system, the first energy storage system of the energy storage regulation system, and the hydrogen production cycle system generate electricity, including: if the current moment is in the peak electricity consumption period, the power generation system and the energy storage regulation system are used to generate electricity, and the excess electric energy is stored in the second energy storage unit of the energy storage regulation system; if the current moment is in the low electricity consumption period, the excess electric energy is stored in the second energy storage unit to produce hydrogen and store it in the hydrogen tank to form hydrogen energy storage.

[0069] Specifically, during the peak electricity consumption period (high load period) in the normal operation mode:

[0070] (1) Power generation system: The thermal power generation unit and the photovoltaic power generation unit operate at full capacity to meet the peak demand. Especially when the solar energy resources are sufficient, the photovoltaic power generation unit is preferentially used to reduce the dependence on traditional energy sources.

[0071] (2) Energy storage regulation system: The first energy storage system (lithium iron phosphate battery pack): mainly used to smooth the output of the power generation system, ensure the stability and continuity of power supply, and avoid voltage fluctuation problems caused by the intermittency of renewable energy. The second energy storage system (nickel-metal hydride battery pack): stores the excess electric energy when the generated electricity exceeds the current demand. This helps to relieve the grid pressure and prepare for the subsequent low load period.

[0072] During the low electricity consumption period (low load period) in the normal operation mode:

[0073] (1) Power generation system: Appropriately reduce the output of the thermal power generation unit according to the actual demand, and maximize the use of the electric energy generated by the photovoltaic power generation unit.

[0074] (2) Energy storage regulation system: The second energy storage system (nickel-metal hydride battery pack): absorbs the excess electric energy when the power demand is low. This part of the electric energy can then be used to start the electrolytic water hydrogen production device to convert the electric energy into hydrogen energy and store it in the hydrogen tank to form hydrogen energy storage. The third energy storage system (supercapacitor bank): as a backup, provides a fast energy response when necessary, but is mainly used to maintain the standby state at this stage.

[0075] In the embodiment of the present application, before adjusting the active power and reactive power balance through the third energy storage system, it includes: detecting whether the output frequency and output voltage of the distribution network deviate from the corresponding preset safety range; if the output frequency and output voltage deviate from the preset safety range, calculating the change value of the active power and the change value of the reactive power; adjusting the active power according to the change value of the frequency, and adjusting the reactive power according to the change value of the voltage until the output frequency and output voltage are within the preset safety range; the voltage regulation system assists in adjusting the voltage magnitude.

[0076] Among them, the calculation formula for the change value of the active power is:

[0077]

[0078] Among them, Δp is the change value of the active power of the capacitor bank, is the frequency change rate of the capacitor bank, θ is the proportion of the capacitor bank participating in frequency modulation, f n is the rated frequency, and ΔE is the power change value of the capacitor bank.

[0079] The calculation formula for the change value of the output voltage is:

[0080]

[0081] Among them, X is the line reactance, Q is the reactive power, V is the output voltage of the distribution network, and β is the proportion of the SVG participating in voltage regulation.

[0082] Specifically, the present application needs to monitor the output frequency and voltage of the distribution network in real time to ensure that they are kept within the preset safety range. Once it is found that the output frequency or voltage deviates from the set safety range, it is necessary to identify the relevant parameters of the distribution network and calculate the corresponding change values of the active power and the output voltage; according to the calculated Δp, charge and discharge the supercapacitor of the third energy storage system, so as to adjust the active power level in the power grid, and use the SVG to adjust the reactive power according to the calculated ΔV to stabilize the grid voltage. The voltage regulation system further finely adjusts the voltage magnitude to ensure that the final output voltage is within the safety range, improving the overall stability of the power grid.

[0083] In the embodiment of the present application, after adjusting the reactive power balance through the SVG, it includes: adjusting the opening and closing of the thyristor by combining the strong electricity and the weak electricity to adjust the voltage amplitude; the voltage control system monitors the voltage amplitude in real time and calculates the optimal value of the voltage amplitude adjustment; controlling the opening and closing of the thyristor to select the corresponding turns of the transformer for on and off to adjust the voltage stability, and at the same time adjusting the reactive power to maintain the reactive power balance. The specific steps are:

[0084] Obtain the voltage parameters, current parameters, and power parameters of each node in the distribution network; analyze whether the current voltage level deviates from the set safe range based on the voltage parameters, current parameters, and power parameters; if the current voltage level deviates from the set safe range, use an optimization algorithm to calculate the corresponding voltage adjustment amount and the optimal configuration of the transformer turns ratio; control the energy storage regulation system to send instructions to the thyristor to adjust the triggering angle of the thyristor, or fully turn on / off the thyristor; determine the transformer turns ratio according to the voltage adjustment amount and the optimal configuration of the transformer turns ratio, and adjust the turns ratio between the primary winding and the secondary winding according to the transformer turns ratio. After each adjustment, monitor the voltage change again to ensure that the current voltage level is within the safe range.

[0085] It should be noted that, as Figure 3 shown, this application assists in adjusting the voltage magnitude through a voltage regulation system. Specifically: real-time monitor and obtain the voltage parameters (such as voltage amplitude, phase), current parameters (such as current intensity, phase), and power parameters (such as active power, reactive power) of each node in the distribution network; based on the collected data, use data analysis tools to evaluate whether the current voltage level deviates from the set safe range; if it is detected that the voltage level deviates from the safe range, use an optimization algorithm to calculate the required voltage adjustment amount and the optimal configuration of the transformer turns ratio. Among them, the optimization algorithm can be a genetic algorithm, particle swarm optimization, etc.

[0086] By controlling the conduction angle of the thyristor to adjust the voltage amplitude, when the voltage deviation is greater than the preset threshold, perform full-on / full-off control, and realize transformer turns switching through the thyristor valve group to avoid arc loss; after each adjustment, the system will monitor the voltage change again to ensure that the current voltage level is within the safe range. If there is still a deviation, repeat the above process until the ideal state is reached. To achieve high-precision voltage regulation through the thyristor, with real-time feedback and iterative optimization, to ensure long-term stability of voltage and reactive power.

[0087] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or N embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0088] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0089] Any process or method description, whether in a flowchart or otherwise described herein, can be understood to represent a module, segment, or portion of code including one or N executable instructions for implementing a customized logical function or process. The scope of the preferred embodiments of the present application includes additional implementations, where the functions may be performed in a substantially simultaneous manner or in a reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present application pertain.

[0090] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits with logic gate circuits for implementing logical functions on data signals, application specific integrated circuits with appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0091] Those of ordinary skill in the art of the present technology can understand that all or part of the steps carried by the method of the above embodiments can be completed by instructing relevant hardware through a program. The program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

Claims

1. A multi-energy complementary "fire-light-storage-hydrogen" park distribution network system, characterized in that Including: A power generation system, wherein the power generation system includes a distributed integrated thermal and photovoltaic power generation system composed of distributed thermal power generation units and photovoltaic power generation units, and generates electricity based on the distributed thermal power generation units and photovoltaic power generation units; An energy storage regulation system for calling corresponding energy storage systems to perform corresponding power generation, hydrogen energy storage, or distribution network voltage and power balance operations under different target operating modes; A hydrogen production cycle system that uses the electric energy stored in the energy storage regulation system to produce hydrogen, stores the hydrogen in a hydrogen tank to convert it into hydrogen energy, and uses the stored hydrogen energy to regulate the distribution network voltage and power balance; A control system that obtains the load data of the park distribution network, determines the target operating mode of the park distribution network according to the load data, and adjusts the power generation system, the energy storage regulation system, and the hydrogen production cycle system according to the target operating mode.

2. The multi-energy complementary "fire-light-storage-hydrogen" park distribution network system according to claim 1, characterized in that The energy storage regulation system includes a first energy storage system, a second energy storage system, and a third energy storage system, wherein The first energy storage system is composed of a lithium iron phosphate battery pack, the second energy storage system is composed of a nickel-metal hydride battery pack, and the third energy storage system is composed of a supercapacitor bank.

3. The multi-energy complementary "fire-light-storage-hydrogen" park distribution network system according to claim 2, characterized in that, The first energy storage system is used for: when the distribution network is in normal operation mode, adjusting the total current output of the lithium iron phosphate battery group in the first energy storage system to smooth the power output of the power generation system and make the output voltage of the power generation system approach sinusoidal alternating current.

4. The multi-energy complementary "thermal - photovoltaic - energy storage - hydrogen" park distribution network system according to claim 2, wherein, The second energy storage unit is connected to an electrolytic water hydrogen production device and is used to store excess electric energy in the second energy storage system and start the hydrogen production cycle to convert it into hydrogen energy storage during the load trough period in the normal operation mode of the distribution network.

5. The multi-energy complementary "fire-light-storage-hydrogen" park distribution network system according to claim 2, characterized in that, The third energy storage unit is used to adjust the active power balance when the distribution network is in island operation mode.

6. A control method for a multi-energy complementary "fire-light-storage-hydrogen" park distribution network system, characterized in that, The method is implemented in the multi-energy complementary "thermal-photovoltaic-energy storage-hydrogen" park distribution network according to any one of claims 1-5, and the method includes the following steps: Obtain the load data of the park distribution network; Determine the target operating mode of the park distribution network according to the load data; Control the power generation system, the energy storage regulation system, and the hydrogen production cycle system according to the target operating mode.

7. The control method of the multi-energy complementary "fire-light-storage-hydrogen" park distribution network system according to claim 6, characterized in that, The controlling the power generation system, the energy storage regulation system, and the hydrogen production cycle system according to the target operating mode includes: If the target operating mode is the normal operation mode, the power generation system, the energy storage regulation system, and the hydrogen production cycle system generate electricity; If the target operating mode is the island operation mode, the third energy storage system of the energy storage regulation system is used to adjust the active power balance and the SVG is used to adjust the reactive power balance.

8. The control method of the multi-energy complementary "fire-light-storage-hydrogen" park distribution network system according to claim 7, characterized in that, The if the target operating mode is the normal operation mode, the power generation system, the first energy storage system of the energy storage regulation system, and the hydrogen production cycle system generate electricity, includes: If the current moment is in the peak electricity consumption period, the power generation system and the energy storage regulation system are used to generate electricity, and the excess electric energy is stored in the second energy storage unit of the energy storage regulation system; If the current moment is in the off-peak electricity consumption period, the excess electric energy is stored in the second energy storage unit to produce hydrogen and store it in a hydrogen tank to form hydrogen energy storage.

9. The control method of the multi-energy complementary "fire-light-storage-hydrogen" park distribution network system according to claim 7, characterized in that, Before regulating the active power and reactive power balance through the third energy storage system, it includes: Detecting whether the output frequency and output voltage of the distribution network deviate from the corresponding preset safety ranges; If the output frequency and the output voltage deviate from the preset safety ranges, calculating the change value of the active power and the change value of the reactive power; Adjusting the active power according to the change value of the frequency and adjusting the reactive power according to the change value of the voltage until the output frequency and the output voltage are within the preset safety ranges; the voltage regulation system assists in adjusting the voltage magnitude.

10. The control method of the multi-energy complementary "fire-light-storage-hydrogen" park distribution network system according to claim 9, characterized in that, The calculation formula for the change value of the active power is: Among them, Δp is the change value of the active power of the capacitor bank, is the frequency change rate of the capacitor bank, θ is the proportion of the capacitor bank participating in frequency modulation, and f n is the rated frequency, and ΔE is the power change value of the capacitor bank.

11. The control method of the multi-energy complementary "fire-light-storage-hydrogen" park distribution network system according to claim 9, characterized in that The calculation formula for the change value of the output voltage is: Where X is the line reactance, Q is the reactive power, V is the output voltage of the distribution network, and β is the ratio of the SVG participating in voltage regulation.

12. The control method of the multi-energy complementary "fire-light-storage-hydrogen" park distribution network system according to claim 7, characterized in that, After regulating the reactive power balance through the SVG, it includes: Adjusting the opening and closing of the thyristor by combining the strong electricity and the weak electricity to adjust the voltage amplitude; The voltage control system monitors the voltage amplitude in real time and calculates the optimal value of the voltage amplitude regulation; Controlling the opening and closing of the thyristor to select the corresponding turn ratio of the transformer to regulate the voltage stability, and at the same time adjusting the reactive power to maintain the reactive power balance. The specific steps are: Obtaining the voltage parameters, current parameters, and power parameters of each node of the distribution network; Analyzing whether the current voltage level deviates from the set safety range according to the voltage parameters, current parameters, and power parameters; If the current voltage level deviates from the set safety range, using an optimization algorithm to calculate the corresponding voltage adjustment amount and the optimal configuration of the transformer turn ratio; Controlling the energy storage regulation system to send commands to the thyristor to adjust the trigger angle of the thyristor, or fully turn on / off the thyristor; Determining the turn ratio of the transformer according to the voltage adjustment amount and the optimal configuration of the transformer turn ratio, and adjusting the turn ratio between the primary winding and the secondary winding according to the turn ratio of the transformer. After each adjustment, monitor the voltage change again to ensure that the current voltage level is within the safety range.

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