Rectifying power supply and control method and device thereof, and rectifying power supply of electrolysis device and control method and device thereof

Abstract

The invention relates to a rectification power supply and a control method and device thereof, and an electrolysis device rectification power supply and a control method and device thereof, and belongs to the technical field of power electronics. The control method comprises the following steps: carrying out active control on the chopper circuit by adopting a current closed-loop control strategy; and when the adjustment instruction issued by the upper computer is not received, the current adjustment quantity corresponding to the frequency active adjustment quantity is used as a current loop active adjustment instruction, and the current adjustment quantity corresponding to the frequency active adjustment quantity is calculated according to the primary frequency modulation active adjustment quantity, the inertia response active adjustment quantity and the load voltage. For a rectification power supply of the electrolysis device, when the amplitude and the change rate of the voltage regulation quantity corresponding to the frequency active regulation quantity meet the set conditions, the frequency active regulation quantity is added on the basis of a DCS instruction. According to the invention, when the power grid has interference and fault, the rectification power supply has active support capability for the power grid, and reliable power supply for the electrolytic cell is considered.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronics, and in particular relates to a rectifier power supply and a control method and device thereof, and a rectifier power supply for an electrolysis device and a control method and device thereof. Background Art

[0002] A rectifier power supply is a device that converts AC grid voltage into DC voltage to supply power to DC loads. A rectifier power supply usually includes a rectifier circuit and a chopper circuit. The input end of the rectifier circuit is connected to AC power, and the output end of the rectifier circuit is connected to the chopper circuit through a DC bus. The output end of the chopper circuit is connected to the load. However, the existing rectifier power supply does not have the ability to actively support the grid. When disturbances and failures occur in the grid, the host computer needs to make decisions and issue instructions. However, the host computer responds slowly to grid disturbances and failures, and cannot adjust the output power of the rectifier power supply in a timely manner.

[0003] Especially in the field of off-grid hydrogen production, this type of rectifier power supply cannot meet the load power regulation requirements of the off-grid hydrogen production system. Off-grid hydrogen production does not draw electricity from the power grid, which can not only enable new energy to be consumed locally and reduce the impact of wind and solar power generation on the power grid, but also drive a significant reduction in the electricity cost of hydrogen production. Therefore, off-grid hydrogen production will become an effective way to improve the cost competitiveness of green hydrogen. Due to the volatility and intermittent characteristics of new energy, there are still many technical and economic difficulties in off-grid hydrogen production at this stage. The off-grid hydrogen production power supply system is not supported by a large power grid. On the one hand, the volatility of new energy requires the configuration of a large-capacity energy storage system to smooth out the fluctuations, affecting the economic benefits of the project. On the other hand, the system is established by a grid-type energy storage system. The system operation involves the frequency and voltage stability of the isolated grid. The output characteristics of wind and solar hydrogen storage, the grid-related characteristics of the grid-connected equipment, and the system's transient and steady-state coordinated control performance all have a great impact on the stability of the system.

[0004] In the off-grid hydrogen production system, the hydrogen production system needs to match the output characteristics of new energy sources to achieve "load follows source" to reduce energy storage configuration. In the existing off-grid green electricity hydrogen production system, the source-grid-load-storage management system is relied on to coordinate and control the balance of power and electricity. The hydrogen production rectifier power supply adjusts the electrolyzer load according to the instructions issued by the source-grid-load-storage management system. The hydrogen production rectifier power supply does not have the ability to actively support the grid. When the grid is disturbed or fails, the source-grid-load-storage management system needs to make decisions and issue instructions. In addition, affected by the communication architecture of the source-grid-load-storage management system, the source-grid-load-storage management system responds to grid interference and failures in seconds. The source-grid-load-storage management system responds to grid disturbances and failures slowly and cannot adjust the operating power in time.

[0005] In addition to off-grid hydrogen production systems that are isolated from the main power grid, large-scale wind and solar grid-connected hydrogen production systems or other electrolysis devices also have the problem of slow response to grid disturbances and faults due to the rectifier power supply not having the ability to actively support the grid. Summary of the invention

[0006] The purpose of the present invention is to provide a rectifier power supply and a control method and device thereof, and a rectifier power supply for an electrolysis device and a control method and device thereof, so as to solve the problem that the existing rectifier power supply has a slow response speed when disturbances and failures occur in the power grid.

[0007] To achieve the above-mentioned purpose, the rectifier power supply control method provided by the present invention is: adopting a current closed-loop control strategy to perform active control on the chopper circuit of the rectifier power supply; when no adjustment instruction issued by the upper computer is received, the current adjustment amount corresponding to the frequency active adjustment amount is used as the current loop active adjustment instruction, and the current adjustment amount corresponding to the frequency active adjustment amount is calculated based on the primary frequency modulation active adjustment amount, the inertia response active adjustment amount and the load voltage.

[0008] Further, when the adjustment instruction sent by the host computer is received, the current loop active adjustment instruction is calculated according to the adjustment instruction sent by the host computer and the current adjustment amount corresponding to the frequency active adjustment amount.

[0009] Furthermore, the current regulation amount corresponding to the frequency active regulation amount is calculated as follows:

[0010]

[0011] Where: ΔP is the frequency active regulation, ΔP f is the primary frequency modulation active power regulation, ΔP J is the active power regulation of inertia response, Δi is the current regulation corresponding to the active power regulation of frequency, u o is the load voltage.

[0012] The beneficial effects of the present invention are as follows: the present invention is an improved invention. When interference and faults occur in the power grid, the rectifier power supply at the equipment layer performs a frequency active active support process on-site. During the frequency active active support process, the power grid frequency is detected on-site at the equipment layer, and the rectifier power supply controller calculates the frequency active adjustment amount according to the power grid frequency, without relying on the host computer, thus saving the time for the rectifier power supply to communicate with the host computer, improving the response speed of the rectifier power supply to interference and faults, and achieving power grid interference and fault defense in seconds or less.

[0013] To achieve the above object, the rectifier power supply control device provided by the present invention includes a memory, a processor and a computer program stored in the memory, and the processor executes the computer program to implement the rectifier power supply control method described above.

[0014] The beneficial effects of the present invention are as follows: the present invention is an improved invention. When interference and faults occur in the power grid, the rectifier power supply at the equipment layer performs a frequency active active support process on-site. During the frequency active active support process, the power grid frequency is detected on-site at the equipment layer, and the rectifier power supply controller calculates the frequency active adjustment amount according to the power grid frequency, without relying on the host computer, thus saving the time for the rectifier power supply to communicate with the host computer, improving the response speed of the rectifier power supply to interference and faults, and achieving power grid interference and fault defense in seconds or less.

[0015] To achieve the above-mentioned purpose, the rectifier power supply provided by the present invention includes a control unit, a rectifier circuit and a chopper circuit, the output end of the rectifier circuit is connected to the input end of the chopper circuit, the output end of the chopper circuit is used to connect to the load, the control unit controls the connection between the rectifier circuit and the chopper circuit respectively, the control unit includes a memory, a processor and a computer program stored in the memory, and the processor executes the computer program to implement the rectifier power supply control method described above.

[0016] The beneficial effects of the present invention are as follows: the present invention is an improved invention. When interference and faults occur in the power grid, the rectifier power supply at the equipment layer performs a frequency active active support process on-site. During the frequency active active support process, the power grid frequency is detected on-site at the equipment layer, and the rectifier power supply controller calculates the frequency active adjustment amount according to the power grid frequency, without relying on the host computer, thus saving the time for the rectifier power supply to communicate with the host computer, improving the response speed of the rectifier power supply to interference and faults, and achieving power grid interference and fault defense in seconds or less.

[0017] To achieve the above object, the rectifier power supply control method of the electrolysis device provided by the present invention is: adopting a current closed-loop control strategy to control the active power of the chopper circuit; when no adjustment instruction issued by the host computer is received, if the current adjustment amount Δi corresponding to the frequency active adjustment amount meets the condition: And Δi min <Δi<Δi max , then the current regulation amount Δi corresponding to the frequency active regulation amount is used as the current loop active regulation instruction; the current regulation amount corresponding to the frequency active regulation amount is calculated based on the primary frequency modulation active regulation amount, the inertia response active regulation amount and the load voltage; where i sloper is the maximum allowable change rate of the current regulation on the chopper side, Δi min is the lower limit of the allowable deviation, Δi max is the upper limit of the allowable deviation, and t is the time.

[0018] Furthermore, when receiving the adjustment command issued by the host computer, if the current adjustment amount Δi corresponding to the frequency active adjustment amount meets the condition: And Δi min <Δi<Δi max, then the current loop active regulation instruction is calculated based on the regulation instruction issued by the host computer and the current regulation amount.

[0019] Furthermore, the current regulation amount Δi corresponding to the frequency active regulation amount is calculated as follows:

[0020]

[0021] Where: ΔP is the frequency active regulation, ΔP f is the primary frequency modulation active power regulation, ΔP J is the active power regulation of inertia response, u o is the load voltage.

[0022] The beneficial effects of the present invention are as follows: the present invention is an improved invention, and the present invention can limit the current regulation amount and the rate of change of the current regulation amount according to the working characteristics of the electrolytic cell, and can take into account the reliable power supply to the electrolytic cell when the frequency active power support is performed on the chopping side. The method calculates the frequency active power regulation amount on-site at the equipment layer and performs active frequency active power support, and directly obtains the chopping side current regulation amount corresponding to the frequency active power regulation amount according to the primary frequency modulation active power regulation amount and the inertia response active power regulation amount. The response speed to frequency fluctuations is faster than the response speed of the host computer, and grid interference and fault processing in seconds or less can be achieved.

[0023] To achieve the above objectives, the rectifier power supply control device for an electrolysis device provided by the present invention includes a memory, a processor and a computer program stored in the memory, and the processor executes the computer program to implement the rectifier power supply control method for the electrolysis device described above.

[0024] The beneficial effects of the present invention are as follows: the present invention is an improved invention, and the present invention can limit the current regulation amount and the rate of change of the current regulation amount according to the working characteristics of the electrolytic cell, and can take into account the reliable power supply to the electrolytic cell when the frequency active power support is performed on the chopping side. The method calculates the frequency active power regulation amount on-site at the equipment layer and performs active frequency active power support, and directly obtains the chopping side current regulation amount corresponding to the frequency active power regulation amount according to the primary frequency modulation active power regulation amount and the inertia response active power regulation amount. The response speed to frequency fluctuations is faster than the response speed of the host computer, and grid interference and fault processing in seconds or less can be achieved.

[0025] To achieve the above-mentioned purpose, the rectifier power supply of the electrolysis device provided by the present invention includes a control unit, a rectifier circuit and a chopper circuit, the output end of the rectifier circuit is connected to the input end of the chopper circuit, the output end of the chopper circuit is used to connect to the electrolytic cell of the electrolysis device, the control unit controls the connection of the rectifier circuit and the chopper circuit respectively, the control unit includes a memory, a processor and a computer program stored in the memory, and the processor executes the computer program to implement the rectifier power supply control method of the electrolysis device described above.

[0026] The beneficial effects of the present invention are as follows: the present invention is an improved invention, and the present invention can limit the current regulation amount and the rate of change of the current regulation amount according to the working characteristics of the electrolytic cell, and can take into account the reliable power supply to the electrolytic cell when the frequency active power support is performed on the chopping side. The method calculates the frequency active power regulation amount on-site at the equipment layer and performs active frequency active power support, and directly obtains the chopping side current regulation amount corresponding to the frequency active power regulation amount according to the primary frequency modulation active power regulation amount and the inertia response active power regulation amount. The response speed to frequency fluctuations is faster than the response speed of the host computer, and grid interference and fault processing in seconds or less can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a rectifier power supply topology diagram of an embodiment of the present invention;

[0028] Figure 2 This is the existing rectifier side control block diagram;

[0029] Figure 3 is a block diagram of voltage reactive power control on the rectifier side according to an embodiment of the present invention;

[0030] Figure 4 is the existing chopper side control block diagram;

[0031] Figure 5 This is a block diagram of the active support control of the chopping side frequency in an embodiment of the present invention;

[0032] Figure 6 It is a control block diagram of the chopping side adapting the electrolytic cell characteristics in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below.

[0034] The basic concept of the present invention is to enable the equipment-level rectifier power supply to have the ability to actively support the grid. When disturbances and failures occur in the grid, power regulation can be performed even if no adjustment instructions are received from the upper computer, thereby shortening the time for responding to grid interference and failures and improving the speed of responding to grid interference and failures.

[0035] A rectifier power supply control method embodiment

[0036] like Figure 1 As shown, the rectifier power supply of the present invention includes a rectifier circuit and a chopper circuit. The input end of the rectifier circuit is used to connect to the power grid, the output end of the rectifier circuit is connected to the input end of the chopper circuit, and the output end of the chopper circuit is used to connect to the load. When the chopper circuit adopts conventional current closed-loop control, the conventional control scheme is as follows: Figure 4As shown, the host computer sends an active current instruction, the active current instruction sent by the host computer is subtracted from the load current value, and after passing through the PI controller, the PWM modulation signal of the chopper unit is obtained through modulation calculation. When the load voltage needs to be controlled, the current closed-loop control is switched to the dual closed-loop control of the voltage outer loop and the current inner loop. The dual closed-loop control process is: the active voltage instruction sent by the host computer, the active voltage instruction sent by the host computer is subtracted from the load voltage, and after passing through the PI controller, the current loop active current instruction is obtained, the current loop active current instruction is subtracted from the load current value, and after passing through the PI controller, the PWM modulation signal of the chopper unit is obtained through modulation calculation.

[0037] Whether it is conventional current closed-loop control or voltage and current dual closed-loop control, it is necessary to receive the adjustment instructions issued by the host computer before control and adjustment can be performed. In this way, when power grid disturbances and failures occur, there is also a problem of slow response speed and inability to adjust in time. Figure 5 As shown, the present invention adds a frequency active adjustment amount to the current loop of the conventional current closed-loop control or voltage and current dual closed-loop control of the chopper circuit, so as to realize the active frequency support of the chopper side. When the adjustment instruction sent by the host computer is not received, the chopper side current adjustment amount corresponding to the frequency active adjustment amount is used as the current loop active adjustment instruction.

[0038] Preferably, when the adjustment instruction sent by the host computer is received, the current loop active adjustment instruction is calculated according to the adjustment instruction sent by the host computer and the frequency active adjustment amount, that is, the current loop active adjustment instruction on the chopping side is the current instruction with the chopping side current adjustment amount corresponding to the frequency active adjustment amount added, and the calculation formula is:

[0039] i ref_1 =i ref +Δi

[0040] In the formula, i ref_1 is the current loop active power regulation instruction on the chopping side, i ref It is the output current instruction issued by the host computer, or the current instruction obtained through the voltage outer loop according to the voltage instruction output by the host computer. Δi is the chopping side current adjustment amount corresponding to the frequency active adjustment amount.

[0041] By adding the chopping side current adjustment amount corresponding to the frequency active adjustment amount to the adjustment instruction issued by the host computer, the chopping circuit can be adjusted more reliably, thereby improving the reliable power supply to the electrolytic cell.

[0042] The frequency active regulation includes two parts: primary frequency regulation active regulation and inertia response active regulation. Therefore, the frequency active regulation is calculated based on the primary frequency regulation active regulation and inertia response active regulation. When the grid frequency deviation exceeds the set dead zone (the setting range is generally: ±0.03Hz~±0.1Hz), the frequency active regulation and its corresponding current regulation are calculated as follows:

[0043]

[0044] Where: ΔP is the frequency active regulation, ΔP f is the primary frequency modulation active power regulation, ΔP J is the inertia response active regulation, Δi is the chopping side current regulation corresponding to the frequency active regulation, u o is the load voltage.

[0045] Among them, the primary frequency modulation active regulation amount ΔP f The calculation formula is as follows:

[0046]

[0047] Where: δ is the primary frequency regulation rate, the setting range is 0.5% to 3%, Δf is the grid frequency deviation value, f n is the rated frequency of the power grid, P n is the rated power of the rectifier power supply.

[0048] Among them, when the frequency change rate is consistent with the frequency offset direction, that is, When the additional inertia response active power adjustment amount, the inertia response active power adjustment amount ΔP J The calculation formula is as follows:

[0049]

[0050] Where: f is the grid frequency, T J It is the inertia time constant, and the setting range is 4 to 14s.

[0051] The above-mentioned frequency active active support process is carried out locally at the rectifier power supply of the equipment layer. When interference and failure occur in the power grid, the power grid frequency is detected at the equipment layer and the frequency modulation active adjustment amount and the inertia response active adjustment amount are calculated once, and the current adjustment amount corresponding to the frequency active adjustment amount is obtained. The current adjustment amount is used as the active current adjustment instruction of the current loop on the chopping side. After the current loop active current instruction and the load current are PI adjusted, the PWM modulation signal is obtained through modulation calculation, so as to realize the frequency active active support on the chopping side of the rectifier power supply locally, without relying on the participation of the host computer. In the process of frequency active active support, the power grid frequency is detected locally at the equipment layer, and the rectifier power supply controller calculates the frequency active adjustment amount according to the power grid frequency, without relying on the host computer, thus saving the time for the rectifier power supply to communicate with the host computer, improving the processing speed of interference and failure, and realizing frequency active active support below the second level. Moreover, the frequency active adjustment amount is added to the adjustment instruction issued by the host computer, so that the rectifier power supply has the ability to actively support the power grid while taking into account the reliable power supply of the electrolyzer.

[0052] Embodiment of a rectifier power supply control method for an electrolysis device

[0053] When the rectifier power load is the electrolyzer of the electrolysis device, such as the electrolyzer of the hydrogen production device, due to the load characteristics of the electrolyzer operation range, regulation rate, allowable fluctuation range, etc., whether the current regulation amount corresponding to the frequency active regulation amount can be used for the active support of the frequency active power on the chopping side needs further judgment. The specific plan is as follows: Figure 6 As shown. If the current regulation value Δi corresponding to the frequency active regulation value meets the condition: And Δi min <Δi<Δi max , then the current regulation amount corresponding to the frequency active regulation amount can be added to the active current regulation instruction in the current closed-loop control of the chopping side. If it is not satisfied, it cannot be added. In the formula: sloper is the maximum allowable change rate of the current regulation on the chopper side, Δi min is the lower limit of the allowable current regulation, Δi max The upper limit of the allowable current regulation.

[0054] Based on the above judgment, in order to improve the response speed of the rectifier power supply when disturbances and faults occur in the power grid, when no adjustment command is received from the host computer, if the current adjustment amount Δi corresponding to the frequency active adjustment amount meets the conditions: And Δi min <Δi<Δi max, then the current regulation amount Δi corresponding to the frequency active regulation amount is used as the current loop active regulation instruction; the current regulation amount corresponding to the frequency active regulation amount is calculated based on the primary frequency modulation active regulation amount, the inertia response active regulation amount and the load voltage. When receiving the regulation instruction sent by the host computer, if the current regulation amount Δi corresponding to the frequency active regulation amount meets the conditions: And Δi min <Δi<Δi max , then the current loop active regulation instruction is calculated based on the regulation instruction issued by the host computer and the current regulation amount.

[0055] According to the characteristics of the electrolytic cell, such as the PEM cell (proton exchange membrane cell), its load change rate can be set to less than (20% * PEM cell load current) / s. The lower limit of the current regulation Δi min and the upper limit of the current regulation Δi max , set by the hydrogen production DCS, such as PEM tank, must meet 5% * rated load current < Δi + i ref <150%*rated load current, i.e. Δi min =5%*rated load current-i ref , Δi max =150%*rated load current-i ref .

[0056] The method of this embodiment can limit the current regulation amount and the rate of change of the current regulation amount according to the working characteristics of the electrolytic cell, and can take into account the reliable power supply to the electrolytic cell when the frequency active power support is performed on the chopping side. The method calculates the frequency active power regulation amount on-site at the equipment layer and performs active frequency active support. The chopping side current regulation amount corresponding to the frequency active power regulation amount is directly obtained according to the primary frequency modulation active power regulation amount and the inertia response active power regulation amount. The response speed to frequency fluctuations is faster than the response speed of the host computer, and grid interference and fault processing in seconds or less can be achieved.

[0057] In this embodiment, a multiple phase-shifted BUCK circuit is used on the chopping side. In other implementations, chopping circuits of other topological structures may be used to actively support the frequency.

[0058] When disturbances and failures occur in the power grid, in order to further improve the response speed of the rectifier power supply, the present invention also improves the reactive power control strategy of the rectifier circuit. Specifically, when the current closed-loop control strategy is used to perform reactive power control on the rectifier circuit, if the reactive power instruction issued by the host computer is not received, the voltage reactive power adjustment amount is used as the current loop reactive power adjustment instruction, and the voltage reactive power adjustment amount is calculated based on the rated AC voltage and the current AC voltage.

[0059] like Figure 3As shown in the figure, the voltage reactive power regulation is added to the current loop q-axis instruction. When the power grid is disturbed or faulty, the voltage reactive power is actively supported on the rectifier side without relying on the participation of the host computer. During the voltage reactive power active support process, the AC voltage amplitude is detected on-site at the equipment layer, and the detection result is received by the control unit of the rectifier power supply, and the voltage reactive power regulation is calculated by the control unit of the rectifier power supply without relying on the host computer, which saves the time for communication between the equipment and the host computer, further improves the processing speed of interference and faults, and can achieve disturbance and fault defense below the second level.

[0060] As a preferred implementation, the calculation formula of voltage reactive power regulation is: Among them, U N is the rated AC voltage, u g is the AC voltage amplitude, k v is the reactive voltage regulation coefficient. Preferably, k v The setting range is 0 to 33.3.

[0061] As a preferred implementation, when receiving the reactive power instruction issued by the host computer, the sum of the voltage reactive power adjustment amount and the reactive power instruction issued by the host computer is used as the current loop reactive power adjustment instruction, that is, the current loop reactive power adjustment instruction i q_ref The calculation formula is: Among them, Q ref It is the reactive power instruction issued by the host computer.

[0062] In order to stabilize the DC bus voltage, Figure 2 As shown, the prior art usually adopts dual closed-loop control of voltage outer loop and current inner loop to drive and control the rectifier circuit. However, when calculating the given value of the active current of the current inner loop, it depends on the output result of the voltage outer loop. When the grid voltage drops, it is necessary to wait until the DC bus voltage responds before it can be reflected in the output result of the voltage outer loop. Therefore, when the grid voltage drops, the voltage outer loop responds slowly, thereby affecting the response speed of the DC bus voltage stable regulation. To this end, the present application improves the conventional dual closed-loop control of voltage outer loop and current inner loop, such as Figure 3 As shown in the figure, load power feedforward control is added to the double closed-loop control, thereby obtaining a double closed-loop control strategy with voltage outer loop and current inner loop with load power feedforward control. The calculation formula of load power feedforward in load power feedforward control is as follows:

[0063] Δi=u o ·i o / u g

[0064] Where Δi is the load power feedforward, u o is the load voltage, i o is the load current, u gis the AC voltage amplitude.

[0065] After adding load power feedforward control to the dual closed-loop control, when the grid voltage drops, it no longer relies on the DC bus voltage in the voltage outer loop to respond. The drop can be directly reflected in the calculation of the active current setting value of the current inner loop by the load power feedforward value. That is, when the grid voltage drops, if the voltage outer loop does not respond in time, the load power feedforward value is used as the active current setting value of the current inner loop, thereby improving the response speed of the DC bus voltage loop and maintaining the bus voltage stability during rapid load adjustment.

[0066] like Figure 3 As shown in the figure, the process of controlling the rectifier circuit by using a double closed-loop control of a voltage outer loop and a current inner loop with load power feedforward control includes: dc and DC bus voltage command u dc_ref The current deviation value is obtained after the PI controller, and the current deviation value is compared with the DC power feedforward value P dc / U dP Add together to get the active current command value i d_ref , the active current command value i d_ref The d-axis component of the AC current i d_fdb The difference is obtained by the PI controller to obtain the active control quantity. q_ref With reactive current feedback i q_fdb The reactive control quantity is obtained by making a difference through the PI controller; the active control quantity and the reactive control quantity are used to generate the PWM drive signal of the rectifier circuit through the SVPWM modulation link.

[0067] A rectifier power supply control device embodiment

[0068] The control device of this embodiment includes a memory, a processor and a computer program stored in the memory, and the processor executes the computer program to implement a rectifier power supply control method. The rectifier power supply control method is the control method mentioned in the above rectifier power supply control method embodiment. For details, please refer to the rectifier power supply control method embodiment, which will not be described in detail here.

[0069] A rectifier power supply embodiment

[0070] like Figure 1As shown, the rectifier power supply of this embodiment includes a control unit, a rectifier circuit and a chopper circuit, the output end of the rectifier circuit is connected to the input end of the chopper circuit, the output end of the chopper circuit is used to connect the load, the control unit controls the connection of the rectifier circuit and the chopper circuit respectively, the control unit includes a memory, a processor and a computer program stored in the memory, and the processor executes the computer program to implement a rectifier power supply control method. The rectifier power supply control method is the control method mentioned in the above-mentioned rectifier power supply control method embodiment, please refer to the rectifier power supply control method embodiment for details, and will not be described in detail here.

[0071] Preferably, the rectifier circuit in this embodiment is a fully controlled three-phase converter using IGBT devices, and has four-quadrant operation capability. Preferably, the chopper circuit in this embodiment is a multi-phase shift BUCK circuit, and has a wide range of output current and voltage regulation capabilities.

[0072] Embodiment of a rectifier power supply control device for an electrolysis device

[0073] The control device includes a memory, a processor, and a computer program stored in the memory, and the processor executes the computer program to implement a rectifier power supply control method for an electrolysis device. The rectifier power supply control method for an electrolysis device is the control method mentioned in the embodiment of the rectifier power supply control method for an electrolysis device, and is specifically referred to in the embodiment of the rectifier power supply control method for an electrolysis device, which will not be described in detail here.

[0074] A rectifier power supply embodiment of an electrolysis device

[0075] The rectifier power supply of the electrolysis device of the present invention includes a control unit, a rectifier circuit and a chopper circuit, the output end of the rectifier circuit is connected to the input end of the chopper circuit, the output end of the chopper circuit is used to connect the electrolytic cell of the electrolysis device, the control unit controls the connection of the rectifier circuit and the chopper circuit respectively, the control unit includes a memory, a processor and a computer program stored in the memory, and the processor executes the computer program to implement a rectifier power supply control method for the electrolysis device. The rectifier power supply control method for the electrolysis device is the control method mentioned in the embodiment of the rectifier power supply control method for the electrolysis device, and specifically refer to the embodiment of the rectifier power supply control method for the electrolysis device, which will not be described in detail here.

[0076] Preferably, the rectifier circuit in this embodiment is a fully controlled three-phase converter using IGBT devices, and has four-quadrant operation capability. Preferably, the chopper circuit in this embodiment is a multi-phase shift BUCK circuit, and has a wide range of output current and voltage regulation capabilities.

[0077] As a preferred implementation, the rectifier power supply of this embodiment adopts a PWM rectifier + chopper two-stage topology. The rectifier side maintains a constant intermediate DC bus voltage and actively adjusts the reactive output according to the grid voltage; the chopper side adjusts the output current or output voltage, and adds a frequency active regulation amount with restrictive conditions on the basis of the DCS instruction, including primary frequency regulation and inertia, so that the rectifier power supply has the ability to actively support the grid while taking into account the reliable power supply to the electrolyzer. The present invention can be applied to large-scale wind and solar grid-connected / off-grid hydrogen production, offshore wind power hydrogen production, and distributed hydrogen production, and improves the ability of the hydrogen production system to adapt to wind and solar output fluctuations.

Claims

1. A rectifier power supply control method, characterized in that: The method is: adopting a current closed-loop control strategy to perform active control on the chopper circuit of the rectifier power supply; when no adjustment command issued by the host computer is received, the current adjustment amount corresponding to the frequency active adjustment amount is used as the current loop active adjustment command, and the current adjustment amount corresponding to the frequency active adjustment amount is calculated based on the primary frequency modulation active adjustment amount, the inertia response active adjustment amount and the load voltage.

2. The rectifier power supply control method according to claim 1, characterized in that: When the adjustment command sent by the host computer is received, the current loop active adjustment command is calculated according to the adjustment command sent by the host computer and the current adjustment amount corresponding to the frequency active adjustment amount.

3. The rectifier power supply control method according to claim 1, characterized in that: The current regulation corresponding to the frequency active regulation is calculated as follows: Where: ΔP is the frequency active regulation, ΔP f is the primary frequency modulation active power regulation, ΔP J is the active power regulation of inertia response, Δi is the current regulation corresponding to the active power regulation of frequency, u o is the load voltage.

4. A rectifier power supply control device, the control device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the rectifier power supply control method according to any one of claims 1 to 3.

5. A rectifier power supply, comprising a control unit, a rectifier circuit and a chopper circuit, wherein the output end of the rectifier circuit is connected to the input end of the chopper circuit, and the output end of the chopper circuit is used to connect to a load, and the control unit controls the connection between the rectifier circuit and the chopper circuit respectively, and the control unit comprises a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the rectifier power supply control method according to any one of claims 1 to 3.

6. A rectifier power supply control method for an electrolysis device, characterized in that: The method is: adopting a current closed-loop control strategy to perform active control on the chopper circuit of the rectifier power supply; when no adjustment instruction issued by the host computer is received, if the current adjustment amount Δi corresponding to the frequency active adjustment amount meets the condition: And Δi min <Δi<Δi max , then the current regulation amount Δi corresponding to the frequency active regulation amount is used as the current loop active regulation instruction; The current regulation corresponding to the frequency active regulation is calculated based on the primary frequency regulation active regulation, inertia response active regulation and load voltage; where i sloper is the maximum allowable change rate of the current regulation on the chopper side, Δi min is the lower limit of the allowable deviation, Δi max is the upper limit of the allowable deviation, and t is the time.

7. The rectifier power supply control method for an electrolysis device according to claim 6, characterized in that: When receiving the adjustment command issued by the host computer, if the current adjustment amount Δi corresponding to the frequency active adjustment amount meets the conditions: And Δi min <Δi<Δi max , then the current loop active regulation instruction is calculated based on the regulation instruction issued by the host computer and the current regulation amount.

8. The rectifier power supply control method for an electrolysis device according to claim 6, characterized in that: The current regulation value Δi corresponding to the frequency active regulation value is calculated as follows: Where: ΔP is the frequency active regulation, ΔP f is the primary frequency modulation active power regulation, ΔP J is the active power regulation of inertia response, u o is the load voltage.

9. A rectifier power supply control device for an electrolysis device, the control device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the rectifier power supply control method for the electrolysis device according to any one of claims 6 to 8.

10. A rectifier power supply for an electrolysis device, comprising a control unit, a rectifier circuit and a chopper circuit, wherein the output end of the rectifier circuit is connected to the input end of the chopper circuit, and the output end of the chopper circuit is used to connect to the electrolytic cell of the electrolysis device, wherein the control unit controls the connection between the rectifier circuit and the chopper circuit respectively, and the control unit comprises a memory, a processor and a computer program stored in the memory, wherein: The processor executes the computer program to implement the rectifier power supply control method for the electrolysis device according to any one of claims 6 to 8.

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