Photovoltaic energy storage and electrolysis integrated system and control method thereof

Abstract

The invention discloses a photovoltaic energy storage and electrolysis integrated system and a control method thereof, and relates to the technical field of new energy. The photovoltaic energy storage and electrolysis integrated system comprises a photovoltaic power generation unit used for converting solar energy into direct current electric energy; the energy storage unit comprises an energy storage battery pack and is provided with a liquid cooling heat management system, and the liquid cooling heat management system is used for adjusting the temperature of the energy storage battery pack in a liquid cooling mode. The first direct-current electric energy router is arranged between the photovoltaic power generation unit and the direct-current bus, and the second direct-current electric energy router is arranged between the energy storage unit and the direct-current bus and used for configuring corresponding power supply output parameters; the bus protection unit comprises a check valve group and / or a high-speed isolation switch, is arranged between the direct-current bus and the main bus and is used for connecting and protecting the direct-current bus and the main bus; and the electrolytic load unit is electrically connected with the main bus and is used for carrying out electrolysis work under direct-current power supply. According to the embodiment of the invention, safe and stable operation of the system can be effectively guaranteed.

Description

Technical Field

[0001] This application belongs to the field of new energy technologies, and particularly relates to a photovoltaic energy storage electrolysis integrated system and a control method thereof. Background Art

[0002] With the rapid development of renewable energy technologies, as one of the global mainstream clean energies, photovoltaic power generation shows broad application prospects in the field of industrial electrolysis. However, photovoltaic power generation still faces many technical challenges in practical applications. At the technical level, currently, the photovoltaic power generation is utilized by adopting an AC grid-connected power supply method. The conventional AC grid-connected power supply method requires additional investment in inverter boost technologies, and also requires long-term payment of grid connection fees and grid capacity fees. These cost factors severely limit the economic benefits of photovoltaic power generation in industrial electrolysis systems. Moreover, due to the intermittent and fluctuating characteristics of new energies such as photovoltaic power, especially in high-light seasons, it may lead to high-power output and power oscillation of equipment, which is not conducive to flexibly meeting the electrolysis load demand, and the frequent fluctuation of photovoltaic power also brings potential risks to the safe operation of related devices such as DC buses and energy storage batteries in the system.

[0003] Based on this, the industry still urgently needs a new type of photovoltaic energy storage electrolysis integrated system to efficiently and flexibly meet the electrolysis load demand and fully ensure the safe and stable operation of the system. Summary of the Invention

[0004] The embodiments of this application provide a photovoltaic energy storage electrolysis integrated system and a control method thereof, which can efficiently and flexibly meet the electrolysis load demand, and can fully ensure the safe and stable operation of the system, thereby effectively improving the energy consumption efficiency and system reliability.

[0005] In a first aspect, the embodiments of this application provide a photovoltaic energy storage electrolysis integrated system, which includes:

[0006] A photovoltaic power generation unit, which is used to convert solar energy into DC electric energy;

[0007] An energy storage unit, the energy storage unit includes at least one energy storage battery pack, and is configured with a liquid cooling thermal management system, and the liquid cooling thermal management system is used to adjust the temperature of the energy storage battery pack by liquid cooling;

[0008] A first DC power router and a second DC power router, the first DC power router is arranged between the photovoltaic power generation unit and the DC bus, and the second DC power router is arranged between the energy storage unit and the DC bus; the first DC power router and the second DC power router include multiple groups of standardized power modules, which are used to configure corresponding power supply output parameters;

[0009] The bus protection unit includes a check valve group and / or a high-speed disconnector. The bus protection unit is arranged between the DC bus and the main bus to connect and protect the DC bus and the main bus.

[0010] The electrolysis load unit is electrically connected to the main bus and is used for electrolysis work under the DC power supply of the main bus.

[0011] In some possible implementation manners, the liquid cooling thermal management system is used for:

[0012] When the temperature difference corresponding to the target energy storage battery pack is detected to be less than the first preset threshold, starting a low-power circulating liquid cooling mode for the target energy storage battery pack;

[0013] When the temperature difference corresponding to the target energy storage battery pack is detected to be greater than or equal to the first preset threshold and less than or equal to the second preset threshold, starting a gradient heat exchange liquid cooling mode for the target energy storage battery pack;

[0014] When the temperature difference corresponding to the target energy storage battery pack is detected to be greater than the second preset threshold, starting a high-power circulating liquid cooling mode for the target energy storage battery pack;

[0015] Wherein, the target energy storage battery pack is any one of at least one energy storage battery pack, and the temperature difference is the temperature difference between the current temperature and the initial temperature of the target energy storage battery pack.

[0016] In some possible implementation manners, the liquid cooling thermal management system is further used for:

[0017] When the temperature difference corresponding to the target energy storage battery pack is detected to be greater than the second preset threshold, reducing the operating power of the target energy storage battery pack by 10% - 50%;

[0018] Wherein, the operating power includes the discharge power and / or the charge power of the target energy storage battery pack.

[0019] In some possible implementation manners, the power supply output parameters include a voltage level and a power capacity, and the standardized power module includes a power electronic building block (PEBB):

[0020] On the low-voltage side of the first DC power router and the second DC power router, the PEBBs are connected in series to configure the corresponding voltage level;

[0021] On the high-voltage side of the first DC power router and the second DC power router, the PEBBs are connected in parallel to configure the corresponding power capacity.

[0022] In some possible implementation manners, the photovoltaic energy storage electrolysis integrated system further includes:

[0023] AC / DC rectifier unit, the input end of the AC / DC rectifier unit is electrically connected to the AC power grid, and the output end of the AC / DC rectifier unit is electrically connected to the main bus, which is used to rectify the alternating current of the AC power grid into direct current and output it to the main bus.

[0024] In some possible implementation manners, the photovoltaic energy storage electrolysis integrated system further includes an energy management unit, and the energy management unit is used for:

[0025] Collect the output power of the photovoltaic power generation unit, the energy storage state of the energy storage unit, and the demand data of the electrolysis load unit;

[0026] Based on the output power of the photovoltaic power generation unit, the energy storage state of the energy storage unit, and the demand data of the electrolysis load unit, dynamically calculate the power distribution coefficient;

[0027] Based on the power distribution coefficient, dynamically regulate the output powers of the photovoltaic power generation unit, the energy storage unit, and the AC / DC rectifier unit.

[0028] In some possible implementation manners, the energy management unit is further used for:

[0029] When it is detected that the output power of the photovoltaic power generation unit increases, control the photovoltaic power generation unit to store the excess electric energy into the energy storage unit, and control the power output by the AC / DC rectifier unit to decrease;

[0030] When it is detected that the output power of the photovoltaic power generation unit decreases, control the energy storage unit to discharge, and control the power output by the AC / DC rectifier unit to increase.

[0031] In some possible implementation manners, the energy management unit is further used for:

[0032] When it is detected that the state of health (SOH) of the target energy storage battery pack in the energy storage unit is greater than the first state threshold, allow the depth of discharge (DOD) of the target energy storage battery pack to reach the first depth threshold;

[0033] When it is detected that the SOH of the target energy storage battery pack is less than or equal to the first state threshold and greater than the second state threshold, limit the DOD of the target energy storage battery pack to be less than or equal to the second depth threshold;

[0034] When it is detected that the SOH of the target energy storage battery pack is less than or equal to the second state threshold, mark and control the target energy storage battery pack to cut out, and control the standby energy storage battery pack to cut in.

[0035] In some possible implementation manners, the energy management unit integrates ModbusTCP and IEC61850 dual-protocol communication interfaces.

[0036] Based on the same inventive concept, in a second aspect, an embodiment of the present application provides a control method for a photovoltaic energy storage electrolysis integrated system, which is applied to the photovoltaic energy storage electrolysis integrated system according to any one of the foregoing embodiments of the present application. The control method of the photovoltaic energy storage electrolysis integrated system includes:

[0037] Collect the output power of the photovoltaic power generation unit, the energy storage state of the energy storage unit, and the demand data of the electrolysis load unit;

[0038] Based on the output power of the photovoltaic power generation unit, the energy storage state of the energy storage unit, and the demand data of the electrolysis load unit, dynamically calculate the power distribution coefficient;

[0039] Based on the power distribution coefficient, dynamically adjust the output powers of the photovoltaic power generation unit, the energy storage unit, and the AC / DC rectifier unit.

[0040] In a third aspect, an embodiment of the present application provides a control device for a photovoltaic energy storage electrolysis integrated system. The control device of the photovoltaic energy storage electrolysis integrated system includes:

[0041] A processor and a memory storing computer program instructions;

[0042] When the processor executes the computer program instructions, it implements the control method for the photovoltaic energy storage electrolysis integrated system provided in any one of the foregoing embodiments of the present application.

[0043] In a fourth aspect, an embodiment of the present application provides a computer storage medium. Computer program instructions are stored on the computer-readable storage medium. When the computer program instructions are executed by a processor, the control method for the photovoltaic energy storage electrolysis integrated system provided in any one of the foregoing embodiments of the present application is implemented.

[0044] In a fifth aspect, an embodiment of the present application provides a computer program product. When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device is caused to execute the control method for the photovoltaic energy storage electrolysis integrated system provided in any one of the foregoing embodiments of the present application.

[0045] A photovoltaic energy storage electrolysis integrated system and its control method provided by an embodiment of the present application. The system includes a photovoltaic power generation unit, an energy storage unit, a first DC power router, a second DC power router, a bus protection unit, and an electrolysis load unit. The DC microgrid architecture is adopted in the system to eliminate the AC-DC conversion loss in the conventional AC grid-connected power supply method. The photovoltaic power generation unit and the energy storage unit can directly transmit direct current to the DC bus through the first DC power router and the second DC power router, and the DC bus distributes and transmits it to the electrolysis load unit through the main bus for electrolysis work, thus fully improving the energy transmission efficiency. The above-mentioned first DC power router and second DC power router can support flexible adjustment and configuration of the power supply output parameters of the photovoltaic power generation unit and the energy storage unit, so as to flexibly meet the electrolysis power consumption requirements of the electrolysis load unit in the system.

[0046] The energy storage unit in the photovoltaic energy storage electrolysis integrated system is also equipped with a liquid cooling thermal management system. The liquid cooling thermal management system can timely adjust the temperature of the energy storage battery pack by liquid cooling to timely address the local hot spot problem of the energy storage battery pack under the fluctuation of photovoltaic power, thereby helping to maintain the battery life and working safety. At the same time, the system also sets a bus protection unit between the DC bus and the main bus. The bus protection unit includes a check valve group and / or a high-speed disconnector. The check valve group can block the reverse current impact, and cooperate with the high-speed disconnector to timely cut off the fault, so as to ensure the overall continuous operation of the system under local faults and fully guarantee the safe and stable operation of the system. In this way, a photovoltaic energy storage electrolysis integrated system and its control method according to an embodiment of the present application can flexibly meet the electrolysis load demand and fully guarantee the safe and stable operation of the system, thereby effectively improving the energy consumption efficiency and system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0048] Figure 1 It is a schematic structural diagram of a photovoltaic energy storage electrolysis integrated system provided by an embodiment of the present application;

[0049] Figure 2 It is a schematic structural diagram of a photovoltaic energy storage electrolysis integrated system provided by another embodiment of the present application;

[0050] Figure 3 It is a schematic structural diagram of a photovoltaic energy storage electrolysis integrated system provided by another embodiment of the present application;

[0051] Figure 4It is a schematic flowchart of a control method for a photovoltaic energy storage electrolysis integrated system provided by an embodiment of the present application;

[0052] Figure 5 It is a schematic structural diagram of a control device for a photovoltaic energy storage electrolysis integrated system provided by an embodiment of the present application. Detailed implementation manners

[0053] The features and exemplary embodiments of various aspects of the present application will be described in detail below. For the purpose of making the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than limiting the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application.

[0054] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the process, method, article or device including the said elements.

[0055] It should be noted that in the embodiments of the present application, some industry-existing solutions such as certain software, components, models, etc. may be mentioned. They should be regarded as exemplary. The purpose is only to illustrate the feasibility in the implementation of the technical solution of the present application, but it does not mean that the applicant has already or necessarily used this solution.

[0056] As described in the background art section, at present, photovoltaic power generation still faces many technical challenges in practical applications. At the technical level, the conventional AC grid-connected power supply method requires additional investment in inverter boost technology, and at the same time, it is necessary to pay the network access fee and grid capacity fee for a long time. These cost factors severely limit the economic benefits of photovoltaic power generation in industrial electrolysis systems. In addition, new energy sources such as photovoltaic have the characteristics of intermittency and volatility. Especially in high-light seasons, it may lead to high-power output and power oscillation of equipment, which brings potential risks to the safe operation of the system.

[0057] Specifically, even in the source-grid-load-storage microgrid system, there are still many technical problems to be solved urgently. First of all, the existing control algorithms are difficult to effectively cope with the dynamic characteristics of the source-storage-load system, resulting in obvious shortcomings in balancing power fluctuations and ensuring the service life of equipment. Secondly, in terms of thermal management, high-power energy storage batteries will generate local hot spot problems during frequent charging and discharging processes. Traditional air-cooling systems are difficult to meet the requirements, often resulting in large temperature differences in the batteries, thus accelerating the attenuation of the batteries. In addition, most of the existing systems adopt fixed operation modes and cannot optimize energy distribution in real time according to light intensity and load demand. This makes the system lack flexibility during multi-modal switching and unable to maximize energy utilization efficiency. These problems jointly restrict the efficiency and sustainable development ability of traditional industrial electrolysis systems.

[0058] In view of the above, in order to solve the existing technical problems, the embodiments of the present application provide a photovoltaic energy storage electrolysis integrated system and its control method. It should be noted that the embodiments provided in the present application do not limit the scope of the disclosure of the present application.

[0059] First, the photovoltaic energy storage electrolysis integrated system provided by the embodiments of the present application will be introduced below.

[0060] Figure 1 It is a schematic structural diagram of a photovoltaic energy storage electrolysis integrated system provided by an embodiment of the present application. As Figure 1 shown, the photovoltaic energy storage electrolysis integrated system 100 includes:

[0061] A photovoltaic power generation unit 10, which is used to convert solar energy into direct current electrical energy;

[0062] An energy storage unit 20, the energy storage unit 20 includes at least one energy storage battery pack, and is configured with a liquid cooling thermal management system, and the liquid cooling thermal management system is used to adjust the temperature of the energy storage battery pack by means of liquid cooling;

[0063] A first DC power router 30 and a second DC power router 40, the first DC power router 30 is arranged between the photovoltaic power generation unit 10 and the DC bus, and the second DC power router 40 is arranged between the energy storage unit 20 and the DC bus; the first DC power router 30 and the second DC power router 40 include multiple groups of standardized power modules, which are used to configure corresponding power supply output parameters;

[0064] A bus protection unit 50, the bus protection unit 50 includes a check valve group and / or a high-speed disconnector, and the bus protection unit 50 is arranged between the DC bus and the main bus, and is used to connect and protect the DC bus and the main bus;

[0065] The electrolysis load unit 60 is electrically connected to the main bus, and the electrolysis load unit 60 is used for electrolysis work under the DC power supply of the main bus.

[0066] Specifically, the above-mentioned photovoltaic power generation unit 10 is used to convert solar energy into DC electrical energy. The photovoltaic power generation unit 10 includes multiple groups of parallel-connected photovoltaic arrays and a Maximum Power Point Tracking (MPPT) controller. The above-mentioned MPPT controller is used to control the photovoltaic module array to maintain maximum power output and can dynamically adapt to changes in light. The MPPT controller can optimize the output power of the photovoltaic module array and improve the photovoltaic power generation efficiency. The DC power output by the above-mentioned photovoltaic array can directly supply the operation of the electrolytic cell, avoiding the energy conversion loss caused by traditional AC grid connection and improving the energy transmission efficiency.

[0067] The above-mentioned energy storage unit 20 includes at least one energy storage battery pack, and the energy storage battery pack can be encapsulated with multiple series-parallel connected energy storage batteries, such as lithium batteries. The energy storage unit 20 is configured with a liquid cooling thermal management system, and the liquid cooling thermal management system is used to adjust the temperature of the energy storage battery pack by liquid cooling. The liquid cooling thermal management system can be integrated in the energy storage unit 20.

[0068] In this way, when the energy storage battery pack overheats due to frequent charging and discharging, overcharging or over-discharging under the fluctuation of photovoltaic power, the temperature of the energy storage battery pack can be regulated in time, so as to effectively slow down the battery aging and ensure the safety and stability of the operation of the energy storage unit 20.

[0069] The above-mentioned first DC power router 30 is arranged between the photovoltaic power generation unit 10 and the DC bus, and the second DC power router 40 is arranged between the energy storage unit 20 and the DC bus. The first DC power router 30 and the second DC power router 40 include multiple groups of standardized power modules for configuring corresponding power supply output parameters. Among them, by using the standardized power modules, the two-way interaction, precise control and intelligent management of the power of the first DC power router 30 and the second DC power router 40 can be realized, so as to flexibly meet the electrolysis power consumption requirements of the electrolysis load unit 60 in the system.

[0070] The above-mentioned power supply output parameters such as the voltage level, power capacity, etc. output by the photovoltaic power generation unit 10 to the DC bus are not strictly limited here.

[0071] The above-mentioned bus protection unit 50 is arranged between the DC bus and the main bus. During normal system operation, the bus protection unit 50 connects the DC bus and the main bus to ensure normal DC power transmission and distribution. At the same time, since the bus protection unit 50 includes a check valve group and / or a high-speed disconnector, the check valve group can block reverse current impact, and the high-speed disconnector can ensure that faults are removed in a timely manner to avoid further expansion of faults. Therefore, the safety protection of the bus can be fully realized, thereby fully ensuring the safe and stable operation of the system.

[0072] The above-mentioned electrolysis load unit 60 can include multiple groups of electrolytic cells and can be used for the electrolytic preparation of substances such as sodium metal, aluminum metal, and hydrogen gas. The electrolysis load unit 60 is electrically connected to the main bus and can be used to distribute and transmit DC power through the DC bus after the photovoltaic power generation unit 10 and / or the energy storage unit 20 transmit DC power to the DC bus, so as to be able to perform electrolysis work under the DC power supply of the main bus.

[0073] It should be added that in the DC microgrid of the present application, the above-mentioned main bus can be understood as a DC bus specially used to stably supply power to the electrolytic cells in the electrolysis load unit 60. The main bus is connected to Figure 1 the DC bus in to allow the electrolytic cells to obtain the required electrical energy from the DC microgrid.

[0074] A photovoltaic energy storage electrolysis integrated system 100 provided by an embodiment of the present application includes a photovoltaic power generation unit 10, an energy storage unit 20, a first DC power router 30, a second DC power router 40, a bus protection unit 50, and an electrolysis load unit 60. The DC microgrid architecture is adopted in the system to eliminate the AC-DC conversion loss in the conventional AC grid-connected power supply method. The photovoltaic power generation unit 10 and the energy storage unit 20 can directly transmit DC power to the DC bus through the first DC power router 30 and the second DC power router 40, and the DC bus distributes and transmits the power to the electrolysis load unit 60 through the main bus for electrolysis work, thereby fully improving the energy transmission efficiency. The above-mentioned first DC power router 30 and second DC power router 40 can support flexible adjustment of the power supply output parameters of the photovoltaic power generation unit 10 and the energy storage unit 20, so as to flexibly meet the electrolysis power consumption requirements of the electrolysis load unit 60 in the system.

[0075] The energy storage unit 20 in the photovoltaic energy storage electrolysis integrated system 100 is also equipped with a liquid cooling thermal management system. The liquid cooling thermal management system can timely adjust the temperature of the energy storage battery pack by means of liquid cooling to timely address the local hot spot problem of the energy storage battery pack under the photovoltaic power fluctuation, thereby contributing to maintaining the battery life and working safety. At the same time, the system also sets a bus protection unit 50 between the DC bus and the main bus. The bus protection unit 50 includes a check valve group and / or a high-speed disconnector. The check valve group can block the reverse current impact, and cooperate with the high-speed disconnector to timely cut off the fault, so as to ensure the overall continuous operation of the system under local faults and fully guarantee the safe and stable operation of the system. Thus, a photovoltaic energy storage electrolysis integrated system 100 according to an embodiment of the present application can flexibly meet the electrolysis load demand and fully guarantee the safe and stable operation of the system, thereby effectively improving the energy consumption efficiency and system reliability.

[0076] According to some embodiments of the present application, optionally, the liquid cooling thermal management system is used for:

[0077] When it is detected that the temperature difference corresponding to the target energy storage battery pack is less than the first preset threshold, starting a low-power circulating liquid cooling mode for the target energy storage battery pack;

[0078] When it is detected that the temperature difference corresponding to the target energy storage battery pack is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, starting a gradient heat exchange liquid cooling mode for the target energy storage battery pack;

[0079] When it is detected that the temperature difference corresponding to the target energy storage battery pack is greater than the second preset threshold, starting a high-power circulating liquid cooling mode for the target energy storage battery pack;

[0080] Wherein, the target energy storage battery pack is any one of at least one energy storage battery pack, and the temperature difference is the temperature difference between the current temperature and the initial temperature of the target energy storage battery pack.

[0081] In this embodiment, the energy storage unit 20 is configured with a liquid cooling thermal management system. The liquid cooling thermal management system can real-time monitor the temperature of the battery through sensors installed in the energy storage battery pack, and thus, according to the detected temperature difference change between the battery temperature and the initial temperature, absorb the heat of the energy storage battery pack by controlling the coolant circulation degree. Wherein, the initial temperature can be the initial temperature at the moment when the energy storage battery pack starts to operate, and its value can also be flexibly configured according to the actual temperature control requirements.

[0082] During actual battery temperature control, the liquid cooling thermal management system can adopt a hierarchical temperature control strategy to adjust the cell temperature in real time. For example, gentle circulating heat dissipation can be adopted at low temperature differences, and switched to gradient stratified heat exchange or enhanced heat dissipation mode at medium and high temperature differences, so as to flexibly achieve the heat dissipation of energy storage batteries under different temperature difference conditions and maintain the battery within the optimal operating temperature range. In this way, it can effectively slow down battery aging and ensure the safety and stability of the energy storage unit 20 during operation.

[0083] In one example, the above liquid cooling thermal management system implements a three-level temperature control strategy according to the temperature difference of the energy storage battery pack: when the temperature difference < 2°C, start the low-power circulating liquid cooling mode; when the temperature difference is 2 - 5°C, activate the gradient heat exchange liquid cooling mode; when the temperature difference > 5°C, trigger the high-power circulating liquid cooling mode. The greater the temperature difference of the energy storage battery pack, the higher the liquid cooling heat exchange intensity and efficiency. This can effectively control the temperature of the battery and improve the performance and lifespan of the battery.

[0084] According to some embodiments of the present application, optionally, the liquid cooling thermal management system is also used for:

[0085] When it is detected that the temperature difference corresponding to the target energy storage battery pack is greater than the second preset threshold, reduce the operating power of the target energy storage battery pack by 10% - 50%;

[0086] Wherein, the operating power includes the discharge power and / or charge power of the target energy storage battery pack.

[0087] The above operating power includes the discharge power and / or charge power of the target energy storage battery pack, which can also be understood as the output power and / or input power of the target energy storage battery pack.

[0088] In this embodiment, when the energy storage battery pack is overheated, by reducing the power output or input of the energy storage battery pack by 10% - 50%, it is possible to reduce the heat generation inside the battery and effectively prevent the battery temperature from rising further, thereby protecting the safety and performance of the energy storage battery pack.

[0089] It should be added that in some embodiments, it can be achieved by controlling the reduction of the power output or input of the entire energy storage unit 20 to reduce the operating power of the target energy storage battery pack by 10% - 50%.

[0090] Furthermore, when the energy storage battery pack is overheated, it can be controlled to reduce the operating power of the target energy storage battery pack by 30% - 50%, so as to more effectively prevent the battery temperature from rising further and protect the performance of the battery.

[0091] According to some embodiments of the present application, optionally, the power supply output parameters include voltage level and power capacity, and the standardized power module includes a power electronics module PEBB:

[0092] On the low-voltage side of the first DC power router 30 and the second DC power router 40, the PEBBs are connected in series to configure the corresponding voltage levels;

[0093] On the high-voltage side of the first DC power router 30 and the second DC power router 40, the PEBBs are connected in parallel to configure the corresponding power capacities.

[0094] In this embodiment, the standardized power modules in the first DC power router 30 and the second DC power router 40 may specifically adopt power electronics building blocks PEBB (Power Electronics Building Block). The PEBB includes power semiconductor devices (such as MOSFETs) and distributed capacitor arrays, and may also include other drive circuits and protection components, etc., which are not strictly limited here.

[0095] The PEBBs in the first DC power router 30 and the second DC power router 40 can adopt a hybrid topology structure in which the low-voltage side is grouped in series to increase the voltage and the high-voltage side is grouped in parallel to expand the power. The high-voltage port can achieve constant voltage control, and the low-voltage port can achieve constant current control, so as to be able to flexibly configure a variety of independent voltage levels and power capacities to meet the power consumption needs of different loads. In this way, the flexibility and scalability of the system are fully improved, and at the same time, the maintainability and performance of the system are enhanced.

[0096] It should be added that in some more specific embodiments, the DC power router adopts a cascaded H-bridge topology (Cascaded H-Bridge, CHB), and this topology can be composed of multiple groups of PEBBs. By adopting the cascaded H-bridge topology, the requirements of different voltage levels and power capacities can be met, and finally flexible power distribution and control can be achieved. In this way, the first / second DC power router 30 / 40 adopting the cascaded H-bridge topology can realize the flexible interconnection between the branch microgrids of this application, thereby effectively improving the reliability and stability of the system.

[0097] Please refer to the following Figure 2 , Figure 2 which is a schematic structural diagram of a photovoltaic energy storage electrolysis integrated system 100 provided by another embodiment of this application. According to some embodiments of this application, optionally, as Figure 2 shown, the photovoltaic energy storage electrolysis integrated system 100 further includes:

[0098] An AC / DC rectification unit 70, the input end of the AC / DC rectification unit is electrically connected to the AC power grid, and the output end of the AC / DC rectification unit 70 is electrically connected to the main bus, and is used to rectify the alternating current of the AC power grid into direct current and output it to the main bus.

[0099] In this application, the above alternating current power grid is, for example, a 35 kV power grid. The AC / DC (Alternating Current / Direct Current) rectification unit can convert alternating current into direct current. The power grid power supply is introduced through the AC / DC rectification unit 70. When the photovoltaic power generation unit 10 or the energy storage unit 20 has insufficient power generation or fails, the main bus can obtain electric energy from the alternating current power grid, thereby ensuring the continuity and stability of the power supply to the electrolysis load unit 60.

[0100] In this way, by introducing the alternating current power grid power supply into the DC microgrid, not only can the reliability and flexibility of the power supply be improved, so as to more fully meet the power consumption needs of the electrolysis load unit 60, ensure the stability of the output voltage on the main bus, but also further ensure the stable and efficient operation of the system.

[0101] Please refer to the following Figure 3 , Figure 3 which is a schematic structural diagram of the photovoltaic energy storage electrolysis integrated system 100 provided by another embodiment of this application. According to some embodiments of this application, optionally, as Figure 3 shown, the photovoltaic energy storage electrolysis integrated system 100 further includes an energy management unit 80. The energy management unit 80 is used for:

[0102] collecting the output power of the photovoltaic power generation unit 10, the energy storage state of the energy storage unit 20, and the demand data of the electrolysis load unit 60;

[0103] dynamically calculating a power distribution coefficient based on the output power of the photovoltaic power generation unit 10, the energy storage state of the energy storage unit 20, and the demand data of the electrolysis load unit 60;

[0104] dynamically regulating the output powers of the photovoltaic power generation unit 10, the energy storage unit 20, and the AC / DC rectification unit 70 based on the power distribution coefficient.

[0105] In actual design, the energy management unit 80 can be implemented by using a host computer or a terminal device, or can also use processors such as a micro grid central controller (MGCC), a microcontroller unit (MCU), and a field programmable gate array (FPGA) to implement the functions of the energy management unit 80.

[0106] In this embodiment, an energy management unit 80 is further provided in the photovoltaic energy storage electrolysis integrated system 100. The energy management unit 80 system can optimize the energy distribution in real time according to different operating states and power supply requirements of the system, and flexibly adjust the power supply strategy according to the light intensity and load demand, so as to achieve more efficient energy management and scheduling and fully improve the energy utilization efficiency.

[0107] Specifically, the energy management unit 80 can collect the output power of the photovoltaic power generation unit 10 in real time through sensors, and collect the energy storage state of the energy storage unit 20 by monitoring the state of charge of the energy storage unit 20 through corresponding sensors, and monitor the demand data of the electrolysis load unit 60 through communication, and the demand data is, for example, power demand.

[0108] Next, based on the collected output power of the photovoltaic power generation unit 10, the energy storage state of the energy storage unit 20, and the demand data of the electrolysis load unit 60, the energy management unit 80 dynamically calculates the power distribution coefficient, and dynamically regulates the output powers of the photovoltaic power generation unit 10, the energy storage unit 20, and the AC / DC rectifier unit 70 according to the calculated power distribution coefficient.

[0109] Exemplarily, the energy management unit 80 determines whether it meets the demand of the electrolysis load unit 60 by calculating the sum of the output power of the photovoltaic power generation unit 10 and the discharge power supported by the energy storage unit 20. If it meets, power is supplied to the electrolysis load unit 60 according to the ratio of the output power of the photovoltaic power generation unit 10 to the discharge power supported by the energy storage unit 20. If it does not meet, the AC / DC rectifier unit 70 can be used to introduce the AC power grid to supplement the power supply.

[0110] For example, if the output power of the photovoltaic power generation unit 10 is 6 kW, the discharge power of the energy storage unit 20 is 3 kW, and the electrolysis load unit 60 requires 10 kW, there is a power gap of 1 kW. Thus, the power distribution coefficient can be determined as follows: the photovoltaic power generation unit 10 0.6 (6 kW / 10 kW), the energy storage unit 20 0.3 (2 kW / 10 kW), the AC / DC rectifier unit 70 (AC power grid) 0.1 (1 kW / 10 kW), and subsequently, the photovoltaic power, energy storage, and power grid can output power to the electrolysis load unit 60 according to the above coefficients.

[0111] According to some embodiments of the present application, optionally, the energy management unit 80 is further configured to:

[0112] When detecting that the output power of the photovoltaic power generation unit 10 increases, control the photovoltaic power generation unit 10 to store the excess electric energy in the energy storage unit 20, and control the output power of the AC / DC rectifier unit 70 to decrease;

[0113] When it is detected that the output power of the photovoltaic power generation unit 10 decreases, control the energy storage unit 20 to discharge, and control the power output by the AC / DC rectifier unit 70 to increase.

[0114] Specifically, when the energy management unit 80 monitors that the output power of the photovoltaic power generation unit 10 fluctuates upward, it can preferentially call the energy storage unit 20 for energy storage peak shaving, and control the power output by the AC / DC rectifier unit 70 to decrease, so as to reduce the power supply of the power grid.

[0115] When the energy management unit 80 monitors that the output power of the photovoltaic power generation unit 10 fluctuates downward, it can preferentially call the energy storage for discharging to fill the valley, and control the power output by the AC / DC rectifier unit 70 to increase, so as to increase the power supply of the power grid.

[0116] In this way, in this embodiment, through the dynamic power distribution strategy of the energy management unit 80, the coordinated operation of the system can be realized, thus fully achieving the energy balance in the case of power fluctuations and ensuring the efficient and stable operation of the system.

[0117] According to some embodiments of the present application, optionally, the energy management unit 80 is further configured to:

[0118] When it is detected that the state of health (SOH) of the target energy storage battery pack in the energy storage unit 20 is greater than the first state threshold, allow the depth of discharge (DOD) of the target energy storage battery pack to reach the first depth threshold;

[0119] When it is detected that the SOH of the target energy storage battery pack is less than or equal to the first state threshold and greater than the second state threshold, limit the DOD of the target energy storage battery pack to be less than or equal to the second depth threshold;

[0120] When it is detected that the SOH of the target energy storage battery pack is less than or equal to the second state threshold, mark and control the target energy storage battery pack to cut out, and control the standby energy storage battery pack to cut in.

[0121] The above state of health (SOH) can represent the ability of the current battery to store electrical energy relative to a new battery, and the depth of discharge (DOD) can be used to measure the percentage between the battery discharge amount and the battery rated capacity.

[0122] Specifically, considering that the deeper the depth of discharge, the shorter the cycle life of the battery. Therefore, in this embodiment, the energy management unit 80 dynamically adjusts the charge and discharge thresholds according to the battery health state to perform life management on the energy storage unit 20, thereby minimizing the life loss of the energy storage unit 20.

[0123] As an example, when the State of Health (SOH) of the energy storage battery pack is detected to be greater than 95% by the energy management unit 80, the allowable charge and discharge depth is up to 90%. If the SOH of the energy storage battery pack satisfies 80% < SOH ≤ 95%, the Depth of Discharge (DOD) is restricted to ≤ 80%. If the SOH of the energy storage battery pack is ≤ 80%, deep charge and discharge are prohibited, and the energy storage battery pack is marked and replaced.

[0124] In this way, by monitoring the SOH of the energy storage battery pack, the energy management unit 80 reasonably controls the DOD to extend the battery life, thereby realizing the full life cycle optimization management of the energy storage battery.

[0125] According to some embodiments of the present application, optionally, the energy management unit 80 integrates ModbusTCP and IEC61850 dual - protocol communication interfaces.

[0126] The energy management unit 80 integrates ModbusTCP and IEC61850 dual - protocol communication interfaces, collects photovoltaic output, energy storage status, and electrolysis load demand data in real - time, dynamically calculates the power distribution coefficient, and integrates the power supply of the power grid, photovoltaic, and energy storage through the multi - source collaborative control module, and supplies power to the electrolyzer through the multi - port DC converter.

[0127] In this embodiment, the energy management unit 80 integrates ModbusTCP and IEC61850 dual - protocol communication interfaces, which can improve the compatibility, flexibility, and management efficiency of the DC micro - grid. In this way, the energy control and allocation in the DC micro - grid can be more fully realized, which helps to improve the stability and reliability of the system operation.

[0128] As can be seen from the above embodiments, the present application proposes a photovoltaic energy storage electrolysis integrated system 100 based on a DC micro - grid, aiming to improve the new energy consumption efficiency and system reliability through multi - unit deep integration and dynamic optimization. The system includes a photovoltaic power generation unit 10, an energy storage unit 20, a DC power router (the first / second DC power router 30 / 40), an electrolysis load unit 60, an energy management unit 80, and a bus protection unit 50.

[0129] To facilitate the understanding of the photovoltaic energy storage electrolysis integrated system 100 provided in the above embodiments, the following uses two specific scenario embodiments to illustrate the operation process of the above system.

[0130] First, please refer to Embodiment 1:

[0131] In this embodiment, the embodiments of the photovoltaic - energy storage - electrolytic water hydrogen production integrated system and its control method are described in detail. The photovoltaic power generation unit 10 adopts multiple parallel arrays, and each array is configured with an independent Maximum Power Point Tracking (MPPT) controller, which can dynamically adapt to light changes, and the power generation efficiency is above 22%.

[0132] The DC power router adopts a cascaded H-bridge topology. Multiple PEBB modules are connected in series to achieve constant voltage control at the high-voltage port, and parallel branches are used to achieve constant current control at the low-voltage port. The electrolysis load unit 60 includes multiple proton exchange membrane electrolyzers, which are respectively connected to the photovoltaic power generation unit 10 and the energy storage unit 20.

[0133] The energy storage unit 20 is composed of 5 1P52S battery boxes connected in series, with a total capacity of 233 kWh and a rated voltage of 832 VDC. The battery cells are 3.2 V / 280 Ah lithium iron phosphate batteries, and an integrated liquid cooling and heating management system is adopted. When the temperature difference between the battery cells of the energy storage battery pack reaches 3 °C, the liquid cooling and heating management system starts the gradient heat exchange mode, divides the temperature zones for stratified heat dissipation, and maintains the battery cell temperature at 42–45 °C. The temperature difference is, for example, the temperature difference between the current temperature and the initial temperature.

[0134] When the output power of the photovoltaic power generation unit 10 drops suddenly, the energy management unit 80 calls the energy storage unit 20 to fill the valley. Moreover, the energy management unit 80 limits the charge and discharge depth to 80% according to the state of health of the battery (SOH = 92%), and supplies constant current power to the electrolysis load unit 60 through the DC power router to ensure a stable hydrogen production rate. The bus protection unit 50 uses a check valve group and a high-speed disconnector to quickly block the impact current and isolate the abnormal branch in case of a fault.

[0135] Next, please refer to Embodiment 2:

[0136] In this embodiment, the embodiments of the photovoltaic–energy storage–electrolytic molten salt for aluminum production integrated system and its control method are described in detail. The photovoltaic power generation unit 10 adopts multiple parallel arrays, and each array is configured with an independent MPPT controller to dynamically adapt to light changes, and the power generation efficiency is over 25%.

[0137] The DC power router adopts a cascaded H-bridge topology. Multiple PEBB modules are connected in series to achieve constant voltage control at the high-voltage port, and parallel branches are used to achieve constant current control at the low-voltage port. The electrolysis load unit 60 includes multiple aluminum chloride molten salt electrolyzers, which are respectively connected to the photovoltaic power generation unit 10 and the energy storage unit 20.

[0138] The energy storage unit 20 is composed of 5 1P52S battery boxes connected in series, with a total capacity of 233 kWh and a rated voltage of 832 VDC. The battery cells are 3.2 V / 280 Ah lithium iron phosphate batteries, and an integrated liquid cooling and heating management system is adopted. When the temperature difference between the battery cells of the energy storage battery pack reaches 3 °C, the liquid cooling and heating management system starts the gradient heat exchange mode, divides the temperature zones for stratified heat dissipation, and maintains the battery cell temperature at 42–45 °C.

[0139] When the output power of the photovoltaic power generation unit 10 suddenly increases, the energy management unit 80 calls the energy storage unit 20 to perform peak shaving. Moreover, the energy management unit 80 allows the charge-discharge depth to 90% according to the state of health of the battery (SOH = 98%), and supplies constant current power to the electrolysis load unit 60 through the DC power router to ensure the stability of the electrolysis rate of synthetic aluminum. The bus protection unit 50 ensures rapid interruption of the impact current and isolation of abnormal branches during a fault through the check valve group and the high-speed disconnector.

[0140] In the above embodiment, the photovoltaic energy storage electrolysis integrated system 100 integrates photovoltaic, energy storage and electrolysis units through a DC microgrid to achieve efficient utilization of new energy. The system adopts a DC architecture to eliminate AC-DC conversion losses. The photovoltaic array directly supplies power to the electrolyzer after being optimized for power generation by MPPT, improving the energy transmission efficiency; the DC power router realizes multi-port regulated constant current control based on the cascaded H-bridge topology. The energy storage unit 20 integrates a liquid cooling thermal management system, balances heat dissipation and output through temperature difference hierarchical regulation, and cooperates with the energy management system to dynamically adjust the charge-discharge threshold to optimize battery life and capacity utilization rate. The energy management unit 80 can preferentially dispatch energy storage to suppress photovoltaic fluctuations when the photovoltaic power fluctuates, reduce the frequency of interaction with the power grid, and enhance the autonomous ability of the system. The bus protection unit 50 is configured with a check valve group and a high-speed disconnector, which can achieve rapid fault removal.

[0141] Overall, the photovoltaic energy storage electrolysis integrated system 100 improves the new energy consumption efficiency and system reliability through deep integration and dynamic optimization of multiple units. It forms multi-dimensional advantages in terms of energy efficiency improvement, equipment life extension and operation and maintenance cost optimization, providing a highly reliable and low-loss integrated solution for high-energy-consuming scenarios such as green power electrolysis, and thus has good industrial demonstration value.

[0142] Based on the photovoltaic energy storage electrolysis integrated system provided in the foregoing embodiment, correspondingly, based on the same inventive concept, the embodiment of the present application provides a control method for a photovoltaic energy storage electrolysis integrated system, which is applied to the photovoltaic energy storage electrolysis integrated system according to any one of the foregoing embodiments of the present application. The control method of the photovoltaic energy storage electrolysis integrated system can be specifically implemented by the energy management unit described in the foregoing embodiment.

[0143] Please refer to the following Figure 4 , Figure 4 which is a schematic flow chart of the control method for a photovoltaic energy storage electrolysis integrated system provided by an embodiment of the present application. As Figure 4 shown, the control method of the photovoltaic energy storage electrolysis integrated system includes the following steps:

[0144] S401, collect the output power of the photovoltaic power generation unit, the energy storage state of the energy storage unit, and the demand data of the electrolysis load unit;

[0145] S402. Dynamically calculate the power distribution coefficient based on the output power of the photovoltaic power generation unit, the energy storage state of the energy storage unit, and the demand data of the electrolysis load unit;

[0146] S403. Dynamically regulate the output powers of the photovoltaic power generation unit, the energy storage unit, and the AC / DC rectification unit based on the power distribution coefficient.

[0147] According to some embodiments of the present application, optionally, the control method of the photovoltaic energy storage electrolysis integrated system further includes:

[0148] When it is detected that the output power of the photovoltaic power generation unit increases, control the photovoltaic power generation unit to store the excess electric energy into the energy storage unit, and control the power output by the AC / DC rectification unit to decrease;

[0149] When it is detected that the output power of the photovoltaic power generation unit decreases, control the energy storage unit to discharge, and control the power output by the AC / DC rectification unit to increase.

[0150] According to some embodiments of the present application, optionally, the control method of the photovoltaic energy storage electrolysis integrated system further includes:

[0151] When it is detected that the state of health (SOH) of the target energy storage battery pack in the energy storage unit is greater than the first state threshold, allow the depth of discharge (DOD) of the target energy storage battery pack to reach the first depth threshold;

[0152] When it is detected that the SOH of the target energy storage battery pack is less than or equal to the first state threshold and greater than the second state threshold, limit the DOD of the target energy storage battery pack to be less than or equal to the second depth threshold;

[0153] When it is detected that the SOH of the target energy storage battery pack is less than or equal to the second state threshold, mark and control the target energy storage battery pack to be cut out, and control the standby energy storage battery pack to be cut in.

[0154] It should be understood that the control method of the photovoltaic energy storage electrolysis integrated system provided in the embodiments of the present application has the beneficial effects of the photovoltaic energy storage electrolysis integrated system provided in the embodiments of the present application. The specific implementation manners can refer to the specific descriptions of the photovoltaic energy storage electrolysis integrated system in the above embodiments. For the sake of brevity, they will not be elaborated here.

[0155] Based on the control method of the photovoltaic energy storage electrolysis integrated system provided in the above embodiments, for the same inventive concept, the present application also provides a control device of a photovoltaic energy storage electrolysis integrated system corresponding to the above control method of the photovoltaic energy storage electrolysis integrated system. Next, Figure 5 A detailed introduction to the control device of the photovoltaic energy storage electrolysis integrated system will be given.

[0156] Please refer to the following Figure 5 , Figure 5 which is a schematic structural diagram of a control device for a photovoltaic energy storage electrolysis integrated system provided by an embodiment of the present application.

[0157] The control device of the photovoltaic energy storage electrolysis integrated system may include a processor 501 and a memory 502 storing computer program instructions.

[0158] Specifically, the above-mentioned processor 501 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0159] The memory 502 may include a mass storage for data or instructions. By way of example and not limitation, the memory 502 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disc, a magneto-optical disc, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. In a suitable case, the memory 502 may include a removable or non-removable (or fixed) medium. In a suitable case, the memory 502 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, the memory 502 is a non-volatile solid state memory.

[0160] The memory may include a read only memory (ROM), a random access memory (RAM), a magnetic disk storage media device, an optical storage media device, a flash memory device, an electrical, optical, or other physical / tangible memory storage device. Thus, in general, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to one aspect of the present disclosure.

[0161] The processor 501 reads and executes the computer program instructions stored in the memory 502 to implement any one of the control methods of the photovoltaic energy storage electrolysis integrated system in the above embodiments.

[0162] In one example, the control device of the data photovoltaic energy storage electrolysis integrated system may further include a communication interface 503 and a bus 510. Among them, as Figure 5 shown, the processor 501, the memory 502, and the communication interface 503 are connected through the bus 510 and complete communication with each other.

[0163] The communication interface 503 is mainly used to implement the communication between various modules, devices, units, and / or equipment in the embodiments of the present application.

[0164] The bus 510 includes hardware, software, or both, and couples the components of the control device of the photovoltaic energy storage electrolysis integrated system to each other. By way of example and not limitation, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a MicroChannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses or a combination of two or more of these. In a suitable case, the bus 510 may include one or more buses. Although the embodiments of the present application describe and illustrate specific buses, the present application contemplates any suitable bus or interconnect.

[0165] The control device of the photovoltaic energy storage electrolysis integrated system executes the control method of the photovoltaic energy storage electrolysis integrated system in the embodiments of the present application, thereby implementing the control method of the photovoltaic energy storage electrolysis integrated system described in the embodiments of the present application.

[0166] In addition, in combination with the control method of the photovoltaic energy storage electrolysis integrated system in the above embodiments, the embodiments of the present application can be implemented by providing a computer storage medium. Computer program instructions are stored on the computer storage medium; when the computer program instructions are executed by a processor, any one of the control methods of the photovoltaic energy storage electrolysis integrated system in the above embodiments is implemented.

[0167] Based on the control method of the photovoltaic energy storage electrolysis integrated system in the above embodiments, the embodiments of the present application provide a computer program product. When the instructions in the computer program product are executed by the processor of an electronic device, the electronic device is caused to execute the control method of the photovoltaic energy storage electrolysis integrated system provided in any one of the above embodiments of the present application.

[0168] It should be clear that the present application is not limited to the specific configurations and processes described above and illustrated in the figures. For the sake of brevity, the detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and illustrated as examples. However, the method process of the present application is not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions, or change the order between the steps after understanding the spirit of the present application.

[0169] The functional blocks shown in the above-described structural block diagrams can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a functional card, and so on. When implemented in software, the elements of the present application are programs or code segments for performing the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted over a transmission medium or communication link via a data signal carried in a carrier wave. A "machine-readable medium" can include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and so on. The code segment can be downloaded via a computer network such as the Internet, an intranet, and so on.

[0170] It should also be noted that the exemplary embodiments mentioned in the present application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps can be executed in the order mentioned in the embodiments, can be different from the order in the embodiments, or several steps can be executed simultaneously.

[0171] Aspects of the present disclosure have been described above with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present disclosure. It should be understood that each block in the flowcharts and / or block diagrams, and the combinations of blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the functions / actions specified in one or more blocks of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It is also understood that each block in the block diagram and / or flowchart, and the combinations of blocks in the block diagram and / or flowchart, can also be implemented by dedicated hardware for performing the specified functions or actions, or by a combination of dedicated hardware and computer instructions.

[0172] As described above, this is only the specific implementation manner of the present application. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein. It should be understood that the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present application.

Claims

1. A photovoltaic energy storage and electrolysis integrated system, characterized in that The system includes: a photovoltaic power generation unit for converting solar energy into direct current electrical energy; an energy storage unit including at least one energy storage battery pack and configured with a liquid cooling thermal management system for regulating the temperature of the energy storage battery pack by means of liquid cooling; a first direct current power router and a second direct current power router, the first direct current power router being disposed between the photovoltaic power generation unit and the direct current bus, and the second direct current power router being disposed between the energy storage unit and the direct current bus; the first direct current power router and the second direct current power router include multiple groups of standardized power modules for configuring corresponding power supply output parameters; a bus protection unit including a check valve group and / or a high-speed disconnector, the bus protection unit being disposed between the direct current bus and the main bus for connecting and protecting the direct current bus and the main bus; an electrolysis load unit electrically connected to the main bus for performing electrolysis work under the direct current power supply of the main bus.

2. The system according to claim 1, characterized in that The liquid cooling thermal management system is used for: starting a low-power circulation liquid cooling mode for the target energy storage battery pack when it is detected that the temperature difference corresponding to the target energy storage battery pack is less than a first preset threshold; starting a gradient heat exchange liquid cooling mode for the target energy storage battery pack when it is detected that the temperature difference corresponding to the target energy storage battery pack is greater than or equal to the first preset threshold and less than or equal to a second preset threshold; starting a high-power circulation liquid cooling mode for the target energy storage battery pack when it is detected that the temperature difference corresponding to the target energy storage battery pack is greater than the second preset threshold; wherein the target energy storage battery pack is any one of the at least one energy storage battery pack, and the temperature difference is the temperature difference between the current temperature and the initial temperature of the target energy storage battery pack.

3. The system according to claim 2, wherein The liquid cooling thermal management system is further used for: reducing the operating power of the target energy storage battery pack by 10% - 50% when it is detected that the temperature difference corresponding to the target energy storage battery pack is greater than the second preset threshold; wherein the operating power includes the discharge power and / or the charging power of the target energy storage battery pack.

4. The system according to claim 1, characterized in that, The power supply output parameters include a voltage level and a power capacity, and the standardized power module includes a power electronic building block (PEBB): on the low-voltage side of the first direct current power router and the second direct current power router, the PEBBs are connected in series to configure the corresponding voltage level; on the high-voltage side of the first direct current power router and the second direct current power router, the PEBBs are connected in parallel to configure the corresponding power capacity.

5. The system according to any one of claims 1-4, characterized in that, The system further includes: an AC / DC rectification unit, the input end of the AC / DC rectification unit being electrically connected to the alternating current power grid, and the output end of the AC / DC rectification unit being electrically connected to the main bus for rectifying the alternating current of the alternating current power grid into direct current and outputting it to the main bus.

6. The system according to claim 5, wherein The system further includes an energy management unit for: Collect the output power of the photovoltaic power generation unit, the energy storage state of the energy storage unit, and the demand data of the electrolysis load unit; Based on the output power of the photovoltaic power generation unit, the energy storage state of the energy storage unit, and the demand data of the electrolysis load unit, dynamically calculate the power distribution coefficient; Based on the power distribution coefficient, dynamically adjust the output powers of the photovoltaic power generation unit, the energy storage unit, and the AC / DC rectifier unit.

7. The system according to claim 6, wherein The energy management unit is further configured to: When it is detected that the output power of the photovoltaic power generation unit increases, control the photovoltaic power generation unit to store the excess electric energy into the energy storage unit, and control the power output by the AC / DC rectifier unit to decrease; When it is detected that the output power of the photovoltaic power generation unit decreases, control the energy storage unit to discharge, and control the power output by the AC / DC rectifier unit to increase.

8. The system according to claim 6, wherein The energy management unit is further configured to: When it is detected that the state of health (SOH) of the target energy storage battery pack in the energy storage unit is greater than the first state threshold, allow the depth of discharge (DOD) of the target energy storage battery pack to reach the first depth threshold; When it is detected that the SOH of the target energy storage battery pack is less than or equal to the first state threshold and greater than the second state threshold, limit the DOD of the target energy storage battery pack to be less than or equal to the second depth threshold; When it is detected that the SOH of the target energy storage battery pack is less than or equal to the second state threshold, mark and control the target energy storage battery pack to be cut out, and control the standby energy storage battery pack to be cut in.

9. The system according to claim 6, characterized in that The energy management unit integrates ModbusTCP and IEC61850 dual-protocol communication interfaces.

10. A control method for a photovoltaic energy storage and electrolysis integrated system, characterized in that, The control method is applied to the photovoltaic energy storage electrolysis integrated system according to any one of claims 6-9; the control method includes: Collect the output power of the photovoltaic power generation unit, the energy storage state of the energy storage unit, and the demand data of the electrolysis load unit; Based on the output power of the photovoltaic power generation unit, the energy storage state of the energy storage unit, and the demand data of the electrolysis load unit, dynamically calculate the power distribution coefficient; Based on the power distribution coefficient, dynamically adjust the output powers of the photovoltaic power generation unit, the energy storage unit, and the AC / DC rectifier unit.

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