Electrochemical system and method of controlling the same

Abstract

The present disclosure relates to an electrochemical system and a control method thereof. The electrochemical system comprises a power side AC bus (10), a control side AC bus (20), a power supply converter (30), a new energy power generation subsystem (40), an electrochemical subsystem (50), an energy storage subsystem (60), an energy management subsystem (70) and a start controller; wherein the power side AC bus is connected with the new energy power generation subsystem, the control side AC bus is used to supply power for the control devices in the new energy power generation subsystem, the electrochemical subsystem and the energy storage subsystem, and the energy management subsystem; the power supply converter is connected with the energy storage battery in the energy storage subsystem and the control side AC bus respectively; the start controller is used to control the power supply converter to convert the direct current output by the energy storage battery into alternating current and transmit to the control side AC bus in response to receiving an instruction indicating off-grid start of the electrochemical system. In this way, the control side AC bus is decoupled from the power side AC bus.

Description

Technical Field

[0001] This disclosure relates to the field of energy storage technology, and more specifically, to an electrochemical system and its control method. Background Technology

[0002] Electrochemistry is the science that studies the phenomena of charged interfaces formed between two types of conductors and the changes that occur therein. Electrochemical reactions can be used to prepare a variety of reactants, such as electrolytic hydrogen production, electrolytic ammonia production, and electrolytic alcohol production. Currently, renewable energy sources such as photovoltaics and wind power can be used to power electrochemical reactions. Electrochemical systems typically have functions including renewable energy power generation, electrochemical reaction preparation, energy storage, and control. Summary of the Invention

[0003] The purpose of this disclosure is to provide an electrochemical system and its control method that can decouple the control-side AC bus from the power-side AC bus.

[0004] To achieve the above objectives, this disclosure provides an electrochemical system, which includes a power-side AC bus, a control-side AC bus, a power converter, a new energy power generation system, an electrochemical subsystem, an energy storage subsystem, an energy management subsystem, and a start-up controller; The power-side AC bus is connected to the new energy power generation system, and the control-side AC bus is used to supply power to the control devices of the new energy power generation system, the electrochemical subsystem, the energy storage subsystem, and the energy management subsystem; the power converter is connected to the energy storage battery in the energy storage subsystem and the control-side AC bus respectively. The start-up controller is used to respond to a command indicating that the electrochemical system should be started off-grid, and to control the power converter to convert the DC power output from the energy storage battery into AC power and transmit it to the control-side AC bus.

[0005] Optionally, the electrochemical system further includes a charger connected to the energy storage battery for charging the energy storage battery.

[0006] Optionally, the start-up controller is further configured to disconnect the power supply converter from the energy storage battery and connect the power supply converter to the power-side AC bus in the event of an abnormality in the power supply of the energy storage battery, so that the power-side AC bus supplies power to the control-side AC bus through the power supply converter.

[0007] Optionally, the electrochemical system further includes a DC bus and an AC / DC converter; The AC terminal of the AC-DC converter is connected to the AC bus on the power side, and the DC terminal of the AC-DC converter is connected to the DC bus. The electrochemical subsystem and the energy storage subsystem are connected through the DC bus.

[0008] Optionally, the electrochemical subsystem includes an electrolytic cell and an electrochemical converter connected to the electrolytic cell, and the energy storage subsystem includes an energy storage converter connected to the energy storage battery. The electrochemical converter and the energy storage converter are connected via the DC bus.

[0009] This disclosure also provides a control method for an electrochemical system, the electrochemical system including a power-side AC bus, a control-side AC bus, a power converter, a new energy power generation system, an electrochemical subsystem, an energy storage subsystem, and an energy management subsystem; The power-side AC bus is connected to the new energy power generation system, and the control-side AC bus is used to supply power to the control devices of the new energy power generation system, the electrochemical subsystem, the energy storage subsystem, and the energy management subsystem; the power converter is connected to the energy storage battery in the energy storage subsystem and the control-side AC bus respectively. The method includes: In response to receiving an instruction to start the electrochemical system off-grid, the power converter is controlled to convert the DC power output from the energy storage battery into AC power and transmit it to the control-side AC bus.

[0010] Optionally, the electrochemical system further includes a charger connected to the energy storage battery; The step of responding to receiving an instruction instructing the electrochemical system to start off-grid, and controlling the power converter to convert the direct current output from the energy storage battery into alternating current, includes: In response to receiving an instruction to start the electrochemical system off-grid, determine whether the state of charge of the energy storage battery is greater than a first charge threshold. If the state of charge of the energy storage battery is less than the first charge threshold, then control the charger to charge the energy storage battery. If the state of charge of the energy storage battery is greater than or equal to the first charge threshold, then the power supply converter is controlled to convert the DC power output by the energy storage battery into AC power.

[0011] Optionally, the method further includes: In the event of an abnormal power supply to the energy storage battery, the power converter is disconnected from the energy storage battery and connected to the power-side AC bus so that the power-side AC bus supplies power to the control-side AC bus through the power converter.

[0012] Optionally, the electrochemical system further includes an uninterruptible power supply (UPS); If the state of charge of the energy storage battery is greater than or equal to the first charge threshold, then controlling the power converter to convert the DC power output from the energy storage battery into AC power includes: If the state of charge of the energy storage battery is greater than or equal to the first charge threshold, then it is determined whether the state of charge of the UPS is greater than the second charge threshold. If the state of charge of the UPS is less than the second charge threshold, the energy storage battery is controlled to charge the UPS through the power converter until the state of charge of the UPS is greater than or equal to the second charge threshold. Then, the power converter is controlled to convert the DC power output by the energy storage battery into AC power.

[0013] Optionally, the electrochemical system further includes a DC bus and an AC / DC converter; the AC terminal of the AC / DC converter is connected to the power-side AC bus, the DC terminal of the AC / DC converter is connected to the DC bus, and the electrochemical subsystem and the energy storage subsystem are connected through the DC bus; After the power generation controller in the new energy power generation system, the electrochemical controller and electrochemical auxiliary equipment in the electrochemical subsystem, the energy storage controller in the energy storage subsystem, and the energy management subsystem are started, the method further includes: The energy storage subsystem is activated to output voltage to the DC bus; Start the AC / DC converter to convert the DC bus voltage into AC power, which serves as the reference voltage for the power-side AC bus. Start the new energy power generation system to transmit power to the power-side AC bus; The electrochemical subsystem is activated to put it into hot standby mode. The energy management subsystem controls the operation of the energy storage subsystem, the new energy power generation system, and the electrochemical subsystem.

[0014] Through the above technical solution, in response to a command instructing the electrochemical system to start off-grid, the control power converter converts the DC power output from the energy storage battery into AC power and transmits it to the control-side AC bus. This power supplies the generator controller in the new energy power generation system, the electrochemical controller in the electrochemical subsystem, the energy storage controller in the energy storage subsystem, and the energy management subsystem. In this way, the control-side AC bus is decoupled from the power-side AC bus, preventing voltage fluctuations on the power side caused by new energy power fluctuations during off-grid operation from affecting the control power consumption of the electrochemical system.

[0015] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a structural block diagram of an electrochemical system provided in an exemplary embodiment.

[0017] Figure 2 This is a structural block diagram of an electrochemical system provided in yet another exemplary embodiment.

[0018] Figure 3 This is a schematic diagram of a power converter switching input provided in an exemplary embodiment.

[0019] Figure 4 This is a flowchart of a control method for an electrochemical system provided in an exemplary embodiment.

[0020] Figure 5 This is a flowchart of a control method for an electrochemical system provided in yet another exemplary embodiment.

[0021] Figure 6 This is a schematic diagram of a control strategy for a new energy power generation system provided in an exemplary embodiment.

[0022] Figure 7 This is a schematic diagram of the control strategy of an energy storage subsystem provided in an exemplary embodiment.

[0023] Figure 8 This is a schematic diagram of a control strategy for an electrochemical subsystem provided in an exemplary embodiment.

[0024] Figure 9 This is a schematic diagram of a control strategy for an AC / DC converter provided in an exemplary embodiment.

[0025] Figure 10 This is a block diagram of an electronic device provided in an exemplary embodiment.

[0026] Explanation of reference numerals in the attached figures 10 power-side AC bus; 20 control-side AC bus; 30 power supply converter; 40 New energy power generation subsystems; 50 Electrochemical subsystems; 60 Energy storage subsystems; 70 Energy Management Subsystem; 80 Charger; 90 DC Bus; 100 AC / DC converter; 41 Generator controller; 42 New energy power generation device; 51 Electrochemical controller; 52 Electrochemical auxiliary equipment; 53 Electrolytic cell; 54 Electrochemical converter; 61 Energy storage controller; 62 Energy storage battery; 63 Energy storage converter. Detailed Implementation

[0027] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0028] It should be noted that all actions involving the acquisition of signals, information, or data in this disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the location is situated, and with authorization from the owner of the relevant device.

[0029] Figure 1 This is a structural block diagram of an electrochemical system provided in an exemplary embodiment. For example... Figure 1 As shown, the electrochemical system includes a power-side AC bus 10, a control-side AC bus 20, a power converter 30, a new energy generation system 40, an electrochemical subsystem 50, an energy storage subsystem 60, an energy management subsystem 70, and a start-up controller (not shown).

[0030] Among them, the power-side AC bus 10 is connected to the new energy power generation system 40, and the control-side AC bus 20 is used to supply power to the control devices and energy management subsystem 70 in the new energy power generation system 40, electrochemical subsystem 50, and energy storage subsystem 60; the power supply converter 30 is connected to the energy storage battery 62 in the energy storage subsystem 60 and the control-side AC bus 20 respectively.

[0031] The start-up controller is used to respond to a command indicating that the electrochemical system should be started off-grid, and to control the power converter 30 to convert the DC power output from the energy storage battery 62 into AC power and transmit it to the control side AC bus 20.

[0032] The new energy generation subsystem 40 is used to convert new energy sources (such as photovoltaic and wind power) into electrical energy to provide power for the entire system. The electrochemical subsystem 50 is used to utilize the electricity generated by the new energy generation subsystem 40 for production, such as hydrogen production, ammonia production, and alcohol production. The energy storage subsystem 60 is used to smooth out power fluctuations between new energy generation and production, for example, by using lithium batteries for energy storage.

[0033] The energy management subsystem 70 may include an energy management controller and auxiliary communication equipment. It can collect operational information from the devices and controllers in each subsystem via data communication, such as voltage, current, pressure, flow rate, temperature, gas content, equipment status, and fault information. This information is used to control the new energy generation subsystem 40, the electrochemical subsystem 50, and the energy storage subsystem 60 for energy management. Data communication methods may include TCP / IP, Modbus TCP, Modbus RTU, CAN, RS485, and IEC61850.

[0034] When a command is received instructing the electrochemical system to start off-grid, the energy storage battery can be used as an energy source to output AC voltage through the power converter, providing auxiliary power to the new energy power generation system 40, the electrochemical subsystem 50, the energy storage subsystem 60, and the energy management subsystem 70. In other words, the power converter outputs AC voltage to the control-side AC bus 20, which in turn provides power to the controllers in the new energy power generation system 40, the electrochemical subsystem 50, the electrochemical auxiliary equipment, and the energy storage subsystem 60.

[0035] When the electrochemical system is off-grid, it can generate electricity through the new energy power generation system 40 to maintain the power of the energy storage battery 62, thereby ensuring the voltage on the control side AC bus 20, that is, ensuring the energy of the auxiliary power supply on the control side of the electrochemical system.

[0036] Through the above technical solution, in response to a command instructing the electrochemical system to start off-grid, the control power converter converts the DC power output from the energy storage battery into AC power and transmits it to the control-side AC bus. This power supplies the generator controller in the new energy power generation system, the electrochemical controller in the electrochemical subsystem, the energy storage controller in the energy storage subsystem, and the energy management subsystem. In this way, the control-side AC bus is decoupled from the power-side AC bus, preventing voltage fluctuations on the power side caused by new energy power fluctuations during off-grid operation from affecting the control power consumption of the electrochemical system.

[0037] Figure 2 This is a structural block diagram of an electrochemical system provided in yet another exemplary embodiment, such as Figure 2 As shown, the new energy power generation system 40 may include a power generation controller 41 and a new energy power generation device 42. The electrochemical subsystem 50 may include an electrochemical controller 51, electrochemical auxiliary equipment 52, an electrolyzer 53, and an electrochemical converter 54. Electrochemical preparation methods may include proton exchange membrane electrolysis for hydrogen production, alkaline electrolysis for hydrogen production, solid oxide electrolysis for hydrogen production, etc., and the electrochemical converter 54 may adopt a DC input and DC output mode.

[0038] The energy storage subsystem 60 includes an energy storage controller 61, an energy storage battery 62, and an energy storage converter 63. The energy storage battery 62 may include a flow battery, a lithium-ion battery, a sodium-ion battery, etc.

[0039] The energy management subsystem 70 can be connected to the power generation controller 41, the electrochemical controller 51, and the energy storage controller 61 via a data interaction bus. Figure 1 and Figure 2 In the diagram, a line with three diagonal lines indicates that the line transmits alternating current (AC).

[0040] like Figure 2As shown, the electrochemical system also includes a charger 80, which is connected to the energy storage battery 62 and is used to charge the energy storage battery 62.

[0041] The charger 80 can be a small charger. When the electrochemical system is shut down for a long time, the energy storage battery 62 may have low power. In order to ensure the smooth start-up of the electrochemical system, the charger 80 can be used to replenish the power of the energy storage battery 62.

[0042] In another embodiment, the start controller is also configured to disconnect the power converter 30 from the energy storage battery 62 and connect the power converter 30 to the power-side AC bus 10 in the event of an abnormality in the power supply of the energy storage battery 62, so that the power-side AC bus 10 supplies power to the control-side AC bus 20 through the power converter 30.

[0043] exist Figure 2 In the middle, the power supply converter 30 can be connected to the energy storage battery 62 via a switch, and also connected to the power side AC bus 10 via a switch. Figure 2 The switch is not shown. Figure 3 This is a schematic diagram of a power converter switching input provided in an exemplary embodiment. For example... Figure 3 As shown, the first AC terminal of the power converter 30 can be connected to the power-side AC bus 10 through the first switch K1 to transmit AC power. The second AC terminal of the power converter 30 is connected to the control-side AC bus 20. The positive and negative terminals of the DC terminal of the power converter 30 are connected to the positive and negative terminals of the energy storage battery 62 through the second switch K2 and the third switch K3, respectively. The energy storage battery 62 is connected to the charger 80.

[0044] During the operation of the electrochemical system, when the power supply of the energy storage battery 62 is abnormal, the external input source of the power converter 30 can be switched from the energy storage battery 62 to the power side AC bus 10 to provide energy, ensuring the reliable operation of the power supply on the system control side.

[0045] In this embodiment, the power supply to the control side adopts a redundant design with both DC and AC input modes. When the DC input is abnormal, it can switch to the AC input mode to maintain the power supply to the control side. Based on this design, the power supply safety of the system control side is achieved, and the reliability of system operation is improved.

[0046] In yet another embodiment, such as Figure 2 As shown, the electrochemical system also includes a DC bus 90 and an AC / DC converter 100. The AC terminal of the AC / DC converter 100 is connected to the power-side AC bus 10, and the DC terminal of the AC / DC converter 100 is connected to the DC bus 90. The electrochemical subsystem 50 and the energy storage subsystem 60 are connected through the DC bus 90.

[0047] The AC-DC converter 100 is an AC-DC power electronic bidirectional converter. The electrochemical subsystem 50 and the energy storage subsystem 60 share the same AC-DC converter 100. The two are only power coupled on the DC side, which saves the design capacity of the subsystem converter and reduces the construction cost of the system.

[0048] The electrochemical subsystem 50 includes an electrolytic cell 53 and an electrochemical converter 54 connected to the electrolytic cell 53. The energy storage subsystem 60 includes an energy storage converter 63 connected to the energy storage battery 62. The electrochemical converter 54 and the energy storage converter 63 are connected via a DC bus 90.

[0049] Based on the same inventive concept, this disclosure also provides a control method for an electrochemical system. The electrochemical system includes a power-side AC bus 10, a control-side AC bus 20, a power converter 30, a new energy generation system 40, an electrochemical subsystem 50, an energy storage subsystem 60, and an energy management subsystem 70. Among them, the power-side AC bus 10 is connected to the new energy power generation system 40, and the control-side AC bus 20 is used to supply power to the control devices and energy management subsystem 70 in the new energy power generation system 40, electrochemical subsystem 50, and energy storage subsystem 60; the power supply converter 30 is connected to the energy storage battery 62 in the energy storage subsystem 60 and the control-side AC bus 20 respectively.

[0050] Figure 4 This is a flowchart of a control method for an electrochemical system provided in an exemplary embodiment. (e.g.) Figure 4 As shown, the method includes step S101.

[0051] In step S101, in response to receiving an instruction to start the electrochemical system off-grid, the power supply converter 30 is controlled to convert the DC power output from the energy storage battery 62 into AC power and transmit it to the control side AC bus 20.

[0052] Through the above technical solution, in response to a command instructing the electrochemical system to start off-grid, the control power converter converts the DC power output from the energy storage battery into AC power and transmits it to the control-side AC bus. This power supplies the generator controller in the new energy power generation system, the electrochemical controller in the electrochemical subsystem, the energy storage controller in the energy storage subsystem, and the energy management subsystem. In this way, the control-side AC bus is decoupled from the power-side AC bus, preventing voltage fluctuations on the power side caused by new energy power fluctuations during off-grid operation from affecting the control power consumption of the electrochemical system.

[0053] In yet another embodiment, the electrochemical system further includes a charger 80 connected to an energy storage battery 62.

[0054] In response to receiving a command instructing the electrochemical system to start off-grid, the power converter 30 is controlled to convert the direct current output from the energy storage battery 62 into alternating current, including the following steps: In response to receiving an instruction to start the electrochemical system off-grid, determine whether the state of charge of the energy storage battery 62 is greater than a first charge threshold. If the state of charge of the energy storage battery 62 is less than the first charge threshold, then the charger 80 is controlled to charge the energy storage battery 62. If the state of charge of the energy storage battery 62 is greater than or equal to the first charge threshold, the control will convert the DC power output by the energy storage battery 62 into AC power.

[0055] If the state of charge of the energy storage battery 62 is greater than the first charge threshold, then the energy of the energy storage battery 62 can be considered to be able to support the establishment of voltage on the AC bus 20 on the control side and the subsequent start-up of the electrochemical system during off-grid startup, until the new energy power generation system 40 starts to operate and generate electricity to provide the energy source for the entire system.

[0056] When the state of charge of the energy storage battery 62 is less than or equal to the first charge threshold, the charger 80 charges the energy storage battery 62 to reach the first charge threshold, and then the DC power output by the energy storage battery 62 is converted into AC power and supplied to the AC bus 20 on the control side.

[0057] In this embodiment, before using the energy storage battery 62 to supply power to the control-side AC bus 20, the energy storage battery 62 is ensured to have sufficient power, which further enhances the reliability of the electrochemical system.

[0058] In yet another embodiment, the method further includes: In the event of an abnormal power supply to the energy storage battery 62, the power converter 30 is disconnected from the energy storage battery 62 and connected to the power-side AC bus 10 so that the power-side AC bus 10 supplies power to the control-side AC bus 20 through the power converter 30.

[0059] An abnormal power supply to the energy storage battery 62 could include, for example, cell failure, high temperature, or short circuits in the battery's connection lines. In this embodiment, a redundant design with both DC and AC input modes is employed. When a DC input failure occurs, the system can switch to AC input to maintain power supply to the control side. This design ensures the safety of the system's control side power supply and improves the reliability of system operation.

[0060] In yet another embodiment, the electrochemical system also includes an uninterruptible power supply (UPS).

[0061] If the state of charge of the energy storage battery 62 is greater than or equal to the first charge threshold, the control power converter 30 converts the DC power output from the energy storage battery 62 into AC power, including the following steps: If the state of charge of the energy storage battery 62 is greater than or equal to the first state of charge threshold, then determine whether the state of charge of the UPS is greater than the second state of charge threshold. If the state of charge of the UPS is less than the second charge threshold, the control energy storage battery 62 charges the UPS through the power supply converter 30 until the state of charge of the UPS is greater than or equal to the second charge threshold. Then, the control power supply converter 30 converts the DC power output from the energy storage battery 62 into AC power.

[0062] In other words, before the power converter 30 converts the DC power output from the energy storage battery 62 into AC power to supply the control-side AC bus 20, in addition to ensuring that the state of charge of the energy storage battery 62 is greater than or equal to the first charge threshold, it also ensures that the state of charge of the UPS is greater than or equal to the second charge threshold. UPS units can be installed in the new energy power generation system 40, the electrochemical subsystem 50, and the energy storage subsystem 60. The first and second charge thresholds can be determined in advance based on experiments or experience.

[0063] In this embodiment, before the energy storage battery 62 supplies power to the control-side AC bus 20, the UPS is also ensured to have sufficient power, further enhancing the reliability of the electrochemical system.

[0064] In another embodiment, the electrochemical system further includes a DC bus 90 and an AC / DC converter 100; the AC terminal of the AC / DC converter 100 is connected to the power-side AC bus 10, and the DC terminal of the AC / DC converter 100 is connected to the DC bus 90; the electrochemical subsystem 50 and the energy storage subsystem 60 are connected through the DC bus 90.

[0065] Figure 5 This is a flowchart of a control method for an electrochemical system provided in another exemplary embodiment. After step S101, the controllers of the energy management subsystem 70, the power generation controller 41, the electrochemical controller 51, the energy storage controller 61, the AC / DC converter controller, the electrochemical auxiliary equipment 52, and other auxiliary power facilities are sequentially activated to establish data communication between the controllers.

[0066] After the power generation controller 41 in the new energy power generation system 40, the electrochemical controller and electrochemical auxiliary equipment 52 in the electrochemical subsystem 50, the energy storage controller 61 in the energy storage subsystem 60, and the energy management subsystem 70 are started, Figure 4 Based on this, the method also includes the following steps: S102, start the energy storage subsystem 60 and output voltage to the DC bus 90; S103, start the AC / DC converter 100 to convert the voltage of the DC bus 90 into AC power as the reference voltage of the power side AC bus 10; S104, start the new energy power generation system 40 so that the new energy power generation system 40 can transmit power to the power side AC bus 10; S105, start the electrochemical subsystem 50 to put the electrochemical subsystem 50 into hot standby state; S106, the energy management subsystem 70 controls the operation of the energy storage subsystem 60, the new energy generation system 40, and the electrochemical subsystem 50.

[0067] Electrochemical auxiliary equipment 52 may include equipment for heat exchange, gas-liquid separation and treatment, compression, etc. In step S101, the AC bus voltage on the system control side is established, each controller is powered on and data communication is established, and then the energy storage subsystem 60, AC / DC converter 100, new energy power generation system 40, and electrochemical subsystem 50 are started in sequence. After each subsystem and equipment has been started, the energy management subsystem 70 allocates the output power of each subsystem in real time according to the new energy power generation prediction data and the current subsystem operation data.

[0068] In this embodiment, when the electrochemical system starts up, the energy storage subsystem 60 outputs voltage to the DC bus 90, and then the AC-DC converter 100 converts the voltage of the DC bus 90 into AC power, which serves as the reference voltage for the power-side AC bus 10. Then, the new energy power generation system 40 is started so that it can transmit power to the power-side AC bus 10. Finally, the electrochemical subsystem 50 is controlled to enter the hot standby state. Since the electrochemical subsystem 50 and the energy storage subsystem 60 share the same AC-DC converter 100, they only perform power coupling on the DC side. The system startup process adapted to this structure in this scheme is different from the conventional startup process. The electrochemical subsystem is directly connected to a stable DC bus voltage, making the operation of the electrochemical subsystem more stable.

[0069] Figure 6 This is a schematic diagram of the control strategy for a new energy power generation system provided in an exemplary embodiment. The new energy power generation system 40 operates in a power control mode. The energy management subsystem performs power limiting operations on the new energy power generation system 40 to ensure the stability of the AC bus 10 voltage on the power side. The maximum power is limited according to the maximum power setpoint, and the maximum power is tracked according to the actual operating conditions of the new energy source to determine the output power setpoint. Closed-loop control is performed in conjunction with real-time power feedback, sending commands to the actuators of the new energy power generation device 42 to control the output power of the new energy power generation system 40.

[0070] Figure 7This is a schematic diagram of the control strategy for an energy storage subsystem provided in an exemplary embodiment. The energy storage subsystem outputs a stable voltage to the DC bus 90 and performs closed-loop control through the DC voltage setpoint and real-time feedback, outputting commands to the actuator of the energy storage converter 63. After establishing a stable DC bus voltage, the AC-DC converter 100 is used to construct the grid voltage of the power-side AC bus. In this way, the input-side voltage stability of the electrochemical subsystem is better, reducing power fluctuations on the electrolytic cell side used for preparation and improving the operating life of the electrochemical subsystem.

[0071] Figure 8 This is a schematic diagram of the control strategy of an electrochemical subsystem provided in an exemplary embodiment. The electrochemical subsystem operates in a power control mode, performing closed-loop control based on the given preparation power and real-time preparation power feedback, outputting commands to the actuator of the electrochemical converter 54 to output power to the electrolytic cell and preheat the electrochemical system to bring it into a hot standby state.

[0072] Figure 9 This is a schematic diagram of a control strategy for an AC / DC converter provided in an exemplary embodiment. A grid reference voltage for the power-side AC bus is constructed with the AC bus voltage and frequency as targets. For example... Figure 9 As shown, closed-loop control is performed based on the given AC voltage and real-time AC voltage feedback to output voltage commands to the actuators of the AC-DC converter 100. Closed-loop control is also performed based on the given AC frequency and real-time AC frequency feedback to output frequency commands to the actuators of the AC-DC converter 100, thereby constructing a stable grid reference voltage.

[0073] Once the electrolytic cell for preparation enters the hot standby state, the energy management subsystem performs system coordination control. By detecting data such as the predicted power of new energy generation, the state of charge of the energy storage subsystem, the preparation power, the output power of new energy, and the grid voltage and frequency, the system performs real-time control of the output of new energy and the preparation output to ensure the normal operation of the electrochemical system.

[0074] Figure 10 This is a block diagram illustrating an electronic device 1000 according to an exemplary embodiment. For example... Figure 10 As shown, the electronic device 1000 may include: a processor 1001 and a memory 1002. The electronic device 1000 may also include one or more of a multimedia component 1003, an input / output (I / O) interface 1004, and a communication component 1005.

[0075] The processor 1001 controls the overall operation of the electronic device 1000 to complete all or part of the steps in the control method described above. The memory 1002 stores various types of data to support the operation of the electronic device 1000. This data may include, for example, instructions for any application or method operating on the electronic device 1000, and application-related data such as contact data, sent and received messages, pictures, audio, video, etc. The memory 1002 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. Multimedia component 1003 may include a screen and an audio component. The screen may be, for example, a touchscreen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in memory 1002 or transmitted via communication component 1005. The audio component also includes at least one speaker for outputting audio signals. I / O interface 1004 provides an interface between processor 1001 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual or physical buttons. Communication component 1005 is used for wired or wireless communication between the electronic device 1000 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IoT, eMTC, or other 5G technologies, or combinations thereof, is not limited here. Therefore, the corresponding communication component 1005 may include: a Wi-Fi module, a Bluetooth module, an NFC module, etc.

[0076] In an exemplary embodiment, the electronic device 1000 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the control method described above.

[0077] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, which, when executed by a processor, implement the steps of the control method described above. For example, the computer-readable storage medium may be the memory 1002 including the program instructions described above, which may be executed by the processor 1001 of the electronic device 1000 to complete the control method described above.

[0078] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0079] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0080] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. An electrochemical system, characterized in that, The electrochemical system includes a power-side AC bus (10), a control-side AC bus (20), a power converter (30), a new energy power generation system (40), an electrochemical subsystem (50), an energy storage subsystem (60), an energy management subsystem (70), and a start-up controller; The power-side AC bus (10) is connected to the new energy power generation system (40), and the control-side AC bus (20) is used to supply power to the control devices of the new energy power generation system (40), the electrochemical subsystem (50), the energy storage subsystem (60), and the energy management subsystem (70); the power converter (30) is connected to the energy storage battery (62) in the energy storage subsystem (60) and the control-side AC bus (20), respectively. The start-up controller is used to respond to receiving an instruction instructing the electrochemical system to start off-grid, and to control the power converter (30) to convert the DC power output from the energy storage battery (62) into AC power and transmit it to the control side AC bus (20).

2. The electrochemical system according to claim 1, characterized in that, The electrochemical system also includes: A charger (80) is connected to the energy storage battery (62) and is used to charge the energy storage battery (62).

3. The electrochemical system according to claim 1 or 2, characterized in that, The start controller is also used to disconnect the power supply converter (30) from the energy storage battery (62) and connect the power supply converter (30) to the power side AC bus (10) in the event of an abnormal power supply to the energy storage battery (62), so that the power side AC bus (10) supplies power to the control side AC bus (20) through the power supply converter (30).

4. The electrochemical system according to claim 1, characterized in that, The electrochemical system also includes a DC bus (90) and an AC / DC converter (100). The AC terminal of the AC-DC converter (100) is connected to the power-side AC bus (10), and the DC terminal of the AC-DC converter (100) is connected to the DC bus (90). The electrochemical subsystem (50) and the energy storage subsystem (60) are connected through the DC bus (90).

5. The electrochemical system according to claim 4, characterized in that, The electrochemical subsystem (50) includes an electrolytic cell (53) and an electrochemical converter (54) connected to the electrolytic cell (53). The energy storage subsystem (60) includes an energy storage converter (63) connected to the energy storage battery (62). The electrochemical converter (54) and the energy storage converter (63) are connected via the DC bus (90).

6. A control method for an electrochemical system, characterized in that, The electrochemical system includes a power-side AC bus (10), a control-side AC bus (20), a power converter (30), a new energy power generation system (40), an electrochemical subsystem (50), an energy storage subsystem (60), and an energy management subsystem (70). The power-side AC bus (10) is connected to the new energy power generation system (40), and the control-side AC bus (20) is used to supply power to the control devices of the new energy power generation system (40), the electrochemical subsystem (50), the energy storage subsystem (60), and the energy management subsystem (70); the power converter (30) is connected to the energy storage battery (62) in the energy storage subsystem (60) and the control-side AC bus (20), respectively. The method includes: In response to receiving an instruction to start the electrochemical system off-grid, the power converter (30) is controlled to convert the DC power output from the energy storage battery (62) into AC power and transmit it to the control side AC bus (20).

7. The method according to claim 6, characterized in that, The electrochemical system also includes a charger (80) connected to the energy storage battery (62); The step of responding to receiving an instruction instructing the electrochemical system to start off-grid, controlling the power converter (30) to convert the direct current output from the energy storage battery (62) into alternating current includes: In response to receiving an instruction to start the electrochemical system off-grid, determine whether the state of charge of the energy storage battery (62) is greater than a first charge threshold. If the state of charge of the energy storage battery (62) is less than the first charge threshold, then the charger (80) is controlled to charge the energy storage battery (62); If the state of charge of the energy storage battery (62) is greater than or equal to the first charge threshold, the power supply converter (30) is controlled to convert the DC power output by the energy storage battery (62) into AC power.

8. The method according to claim 6, characterized in that, The method further includes: In the event of an abnormal power supply to the energy storage battery (62), the power converter (30) is disconnected from the energy storage battery (62) and connected to the power-side AC bus (10) so that the power-side AC bus (10) supplies power to the control-side AC bus (20) through the power converter (30).

9. The method according to claim 6, characterized in that, The electrochemical system also includes an uninterruptible power supply (UPS); If the state of charge of the energy storage battery (62) is greater than or equal to the first charge threshold, then the power converter (30) is controlled to convert the DC power output from the energy storage battery (62) into AC power, including: If the state of charge of the energy storage battery (62) is greater than or equal to the first charge threshold, then determine whether the state of charge of the UPS is greater than the second charge threshold. If the state of charge of the UPS is less than the second charge threshold, the energy storage battery (62) is controlled to charge the UPS through the power converter (30) until the state of charge of the UPS is greater than or equal to the second charge threshold. Then, the power converter (30) is controlled to convert the DC power output by the energy storage battery (62) into AC power.

10. The method according to any one of claims 6-9, characterized in that, The electrochemical system also includes a DC bus (90) and an AC / DC converter (100); the AC terminal of the AC / DC converter (100) is connected to the power-side AC bus (10), and the DC terminal of the AC / DC converter (100) is connected to the DC bus (90); the electrochemical subsystem (50) and the energy storage subsystem (60) are connected through the DC bus (90). After the power generation controller (41) in the new energy power generation system (40), the electrochemical controller and electrochemical auxiliary equipment (52) in the electrochemical subsystem (50), the energy storage controller (61) in the energy storage subsystem (60), and the energy management subsystem (70) are started, the method further includes: The energy storage subsystem (60) is activated to output voltage to the DC bus (90); Start the AC / DC converter (100) to convert the voltage of the DC bus (90) into AC power, which serves as the reference voltage for the power-side AC bus (10); Start the new energy power generation system (40) so that the new energy power generation system (40) transmits power to the power side AC bus (10); The electrochemical subsystem (50) is activated to put it into a hot standby state. The energy management subsystem (70) controls the operation of the energy storage subsystem (60), the new energy power generation system (40), and the electrochemical subsystem (50).

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