Modularized direct-current hydrogen production power supply and control method

Abstract

The invention relates to the field of direct-current power supplies, in particular to a modular direct-current hydrogen production power supply, a control method, a storage medium and equipment, and the modular direct-current hydrogen production power supply comprises a boost inductor, m multi-isolation output step-down units and a non-isolation regulating circuit, the non-isolation adjusting circuit comprises n non-isolation modules; one end of the boost inductor is connected with the positive input end of the hydrogen production power supply, and the input side of each multi-isolation output voltage reduction unit is connected in series between the other end of the boost inductor and the negative input end of the hydrogen production power supply. The n paths of outputs of the multi-isolated output voltage reduction units are correspondingly connected in parallel and then are respectively connected with the n non-isolated modules; and the output ports of the non-isolated modules are connected in parallel, independently or partially connected in parallel and then serve as the output of the hydrogen production power supply. According to the invention, mixed access of multiple types of electrolytic cells can be realized, the system reliability is improved while the new energy consumption rate is improved, and then efficient and highly reliable renewable energy hydrogen production development is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of direct current power supplies, and in particular to a modular direct current hydrogen production power supply, a control method, a storage medium and a device. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Hydrogen energy is the best way to store renewable energy on a large scale and for a long period of time. The cost of hydrogen storage containers is 10 times lower than that of fixed energy storage batteries. The midstream transportation method is flexible and the downstream application frequency domain is wide. Under the requirements of the national dual-carbon background, the proportion of new energy in the future power system will further increase, presenting a "wind and solar-based, diversified and coordinated" supply and demand pattern. However, the volatility of new energy poses a great challenge to the stability of the power grid. Stable and periodic storage and regulation are urgently needed to achieve cross-seasonal and long-term power regulation. Hydrogen production from renewable energy is an effective means.

[0004] The large-capacity of renewable energy power generation has led to an increase in the capacity of the converter, which requires the use of power devices with larger power levels, or the use of a topology of multiple low-voltage converters in parallel to meet the requirements of high-power conversion. Among them, the use of a multi-low-voltage converter parallel structure has flexible redundant control characteristics, which can effectively improve the reliability of the system. However, when the load is low, its efficiency is much lower than the efficiency under rated conditions, and a control strategy is needed to optimize and improve the overall efficiency of the parallel system. At present, the power of the multi-low-voltage converter parallel structure is generally less than 10MW. As the power increases to more than 10MW, the low bus voltage will cause increased line losses and short transmission distances. The improvement of the operating efficiency of the hydrogen production system faces challenges, and the applicability of the low-voltage parallel solution needs to be studied.

[0005] Overall, DC off-grid hydrogen production technology has received widespread attention around the world. Various countries have also conducted relatively in-depth research and launched many demonstration projects, and have made certain progress. However, existing conventional hydrogen production power supplies are mostly based on grid-connected system considerations and designs, and the power input side is AC. The hydrogen production power supply used for new energy DC off-grid hydrogen production has a low input voltage level and low capacity. Existing DC / DC hydrogen production power supply products are only suitable for low-voltage occasions and cannot meet the future large-scale renewable energy off-grid hydrogen production using medium-voltage DC application requirements. In view of the above defects, the present invention has made improvements. Summary of the invention

[0006] In order to overcome the shortcomings of the background technology, the present invention provides a modular DC hydrogen production power supply, a control method, a storage medium and an equipment. The modular DC hydrogen production power supply can realize the mixed access of various types of electrolyzers, improve the new energy consumption rate and improve the system reliability, thereby realizing efficient and highly reliable renewable energy hydrogen production development.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] In a first aspect, a modular direct current hydrogen production power supply is provided, including a boost inductor, m multiple isolated output buck units, and a non-isolated regulation circuit;

[0009] The non-isolated regulation circuit includes n non-isolated modules;

[0010] One end of the boost inductor is connected to the positive input end of the hydrogen production power supply, and the input side of each of the multi-isolated output buck units is connected in series between the other end of the boost inductor and the negative input end of the hydrogen production power supply, and the n outputs of each of the multi-isolated output buck units are connected in parallel and then respectively connected to the n non-isolated modules;

[0011] The output ports of the non-isolated modules are connected in parallel, independently or partially in parallel as the output of the hydrogen production power supply.

[0012] Further,

[0013] The multi-isolated output buck unit includes a voltage regulation and fault isolation circuit, an inverter circuit and a multi-isolated conversion and rectification circuit;

[0014] Using the input end of the voltage regulation and fault isolation circuit as the input port of the multi-isolated output buck unit;

[0015] The input end of the inverter circuit is connected to the output end of the voltage regulation and fault isolation circuit, and the output end of the inverter circuit is connected to the multi-isolation conversion rectifier circuit;

[0016] The multi-isolated conversion and rectification circuit has n output terminals, and the n output terminals are used as n outputs of the multi-isolated output buck unit.

[0017] Further,

[0018] The multi-isolation conversion rectifier circuit includes n isolation conversion rectifier circuits;

[0019] The input side of each of the isolated conversion and rectification circuits is connected in parallel to the output end of the inverter circuit, and the output sides of each of the isolated conversion and rectification circuits are independent of each other and form n output ends of the multiple isolated conversion and rectification circuits.

[0020] Further,

[0021] The isolated conversion rectifier circuit includes a resonant inductor, a resonant capacitor, a magnetizing inductor, a step-down AC transformer, a rectifier circuit and an output capacitor;

[0022] One end of the resonant inductor and one end of the resonant capacitor are respectively connected to two ends of the output side of the inverter circuit, the other end of the resonant inductor and the other end of the resonant capacitor are respectively connected to two ends of the input side of the step-down AC transformer, and the magnetizing inductor is connected in parallel to the input side of the step-down AC transformer;

[0023] The output side of the step-down AC transformer is connected to the input side of the rectifier circuit, and the output side of the rectifier circuit is connected in parallel with the output capacitor to serve as the output of the isolation conversion rectifier circuit.

[0024] Further,

[0025] The voltage regulation and fault isolation circuit includes two bridge arm switches and a DC support capacitor;

[0026] The two-arm switch includes an upper tube and a lower tube, a path is led out from between the upper tube and the lower tube as the positive input end of the voltage regulation and fault isolation circuit, and a path is led out from an end of the lower tube away from the upper tube as the negative input end of the voltage regulation and fault isolation circuit;

[0027] The two ends of the two bridge arm switches are connected in parallel with the DC support capacitor and serve as output ends of the voltage regulation and fault isolation circuit.

[0028] Further,

[0029] The inverter circuit is a four-arm switch;

[0030] The non-isolated module adopts a buck converter.

[0031] Further,

[0032] A bypass switch is connected in parallel to the input side of each of the multi-isolation output buck units.

[0033] In a second aspect, a control method for a modular direct current hydrogen production power supply is also provided, which is applied to the modular direct current hydrogen production power supply as described above, and the control method comprises:

[0034] Adjusting the duty cycle of the switch tubes in each of the voltage regulation and fault isolation circuits to achieve balanced control of the output voltage of each of the voltage regulation and fault isolation circuits;

[0035] Using a fixed switching frequency and a fixed duty cycle to drive the switch tubes in each of the inverter circuits;

[0036] The duty cycle of the switch tube in each of the non-isolated modules is adjusted to achieve closed-loop control of the voltage / current at the output port of each of the non-isolated modules.

[0037] Based on the same inventive concept, the present invention also provides a computer-readable storage medium storing one or more programs, which, when executed, can implement the control method of the modular direct current hydrogen production power supply as described above.

[0038] Based on the same inventive concept, the present invention also provides an electronic device, including a processor, a communication interface, a computer-readable storage medium as described above, and a communication bus; wherein the processor, the communication interface, and the computer-readable storage medium communicate with each other via the communication bus; and the processor is used to execute the program stored in the computer-readable storage medium.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. It provides a medium-voltage large-capacity hydrogen production power supply solution, which can realize power conversion from medium-voltage DC to low-voltage various types of electrolyzers. It has a modular structure and distributed multi-port output capability, can achieve module-level redundancy, greatly improve system reliability, and avoid the difficulty of manufacturing large-capacity AC transformers, greatly increase the capacity of the hydrogen production power supply system, and adapt to the volatility, intermittency and high reliability requirements of renewable energy power conversion;

[0041] 2. The output ports of each non-isolated module can be connected in parallel, independently or partially in parallel, so as to realize mixed access of multiple types of electrolyzers, thereby meeting the requirements of different electrolyzer capacities and voltage levels; the output ports of each non-isolated module can be connected in parallel as the output of hydrogen production power supply, so as to realize the single-channel output form for a single electrolyzer; the output ports of each non-isolated module can be connected independently or partially in parallel as the output of hydrogen production power supply, so as to realize the multi-channel output form for multiple electrolyzers;

[0042] 3. A bypass switch is connected in parallel on the input side of each multi-isolated output buck unit. When a multi-isolated output buck unit fails, the corresponding bypass switch is closed to bypass the faulty multi-isolated output buck unit, which can flexibly isolate the faulty circuit, improve the new energy consumption rate and enhance system reliability.

[0043] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings.

[0044] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0046] Figure 1 This is a schematic diagram of a single-channel output form of a modular direct current hydrogen production power supply for a single electrolyzer according to an embodiment of the present invention;

[0047] Figure 2 It is a schematic diagram of a multi-channel output form of a modular direct current hydrogen production power supply for multiple electrolyzers according to an embodiment of the present invention;

[0048] Figure 3 for Figure 1 A partial schematic diagram of Zhongduo isolated output buck unit #1;

[0049] Figure 4 for Figure 1 A partial schematic diagram of the non-isolated regulation circuit;

[0050] Figure 5 for Figure 2 A partial schematic diagram of the non-isolated regulation circuit;

[0051] Figure 6 This is a schematic diagram of a control block diagram of a modular direct current hydrogen production power supply according to an embodiment of the present invention;

[0052] Figure 7 The figure is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the implementation of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] like Figure 1-5 As shown, an embodiment of the present invention provides a modular direct current hydrogen production power supply, including a boost inductor, m multi-isolated output buck units, and a non-isolated regulation circuit;

[0055] The non-isolated regulation circuit includes n non-isolated modules;

[0056] One end of the boost inductor is connected to the positive input end of the hydrogen production power supply, and the input side of each of the multi-isolated output buck units is connected in series between the other end of the boost inductor and the negative input end of the hydrogen production power supply, and the n outputs of each of the multi-isolated output buck units are connected in parallel and then respectively connected to the n non-isolated modules;

[0057] The output ports of the non-isolated modules are connected in parallel, independently or partially in parallel as the output of the hydrogen production power supply.

[0058] In the above technical scheme, the boost inductor has a boosting effect, and it is also used for filtering and storing input DC voltage. The input side of m multiple isolated output step-down units is connected in series to achieve voltage division. The use of m multiple isolated output step-down units can convert the medium voltage DC input to low voltage output V1~Vn, and the low voltage output V1~Vn is then input into n non-isolated modules for regulation; the output end of the non-isolated regulation circuit in this embodiment is connected to the hydrogen production electrolyzer, and the output port voltage / current can be adjusted according to the needs of the hydrogen production electrolyzer. Specifically, the closed-loop control of the voltage / current of each output port is achieved by adjusting the duty cycle of the non-isolated regulation circuit, thereby meeting the power supply needs of the hydrogen production electrolyzer. In this embodiment, the output ports of each of the non-isolated modules can be connected in parallel, independently or partially in parallel, so as to meet the needs of different electrolyzer capacities and voltage levels; specifically, the output ports of each of the non-isolated modules are connected in parallel as the output of the hydrogen production power supply, which can achieve a single-channel output form for a single electrolyzer, such as Figure 4 As shown; the output ports of each non-isolated module are connected independently or partially in parallel as the output of the hydrogen production power supply, which can realize a multi-channel output form for multiple electrolyzers, such as Figure 5 shown.

[0059] The above-mentioned modular DC hydrogen production power supply provides a medium-voltage, large-capacity hydrogen production power supply solution, which can realize power conversion from medium-voltage DC to low-voltage various types of electrolyzers. It has a modular structure and distributed multi-port output capability, can achieve module-level redundancy, greatly improve system reliability, and avoid the difficulty of producing and manufacturing large-capacity AC transformers, greatly improve the capacity of the hydrogen production power supply system, and adapt to the volatility, intermittency and high reliability requirements of renewable energy power conversion.

[0060] In this embodiment, for m multi-isolated output buck units, each multi-isolated output buck unit has n output ports A1B1~AnBn; the output ends of each multi-isolated output buck unit are connected correspondingly, that is, the output end A1 of the multi-isolated output buck unit #1 is connected to the output end A1 of the multi-isolated output buck unit #2, the output end B1 of the multi-isolated output buck unit #1 is connected to the output end B1 of the multi-isolated output buck unit #2, and so on. Therefore, after the output sides of all the multi-isolated output buck units are connected correspondingly, there are a total of n output ports isolated from each other, namely A1B1~AnBn.

[0061] In this embodiment, the function of the boost inductor is similar to that of the inductor in a traditional Boost circuit. In addition to the functions of boosting, filtering and energy storage, the boost inductor in this embodiment also has the functions of smoothing and current limiting. For example, when the voltage regulation and fault isolation circuit keeps the upper tube straight and the lower tube locked, the boost inductor has the function of limiting the input side current ripple; for example, it limits the charge and discharge current of the output capacitors (i.e., DC support capacitors) Ch1~Chm in the voltage regulation and fault isolation circuit.

[0062] The various components of the above-mentioned modular DC hydrogen production power supply will be further described below.

[0063] As a preferred technical solution, Figure 3 As shown, taking the multi-isolated output buck unit #1 as an example, the multi-isolated output buck unit includes a voltage regulation and fault isolation circuit, an inverter circuit and a multi-isolated conversion rectifier circuit; the input end of the voltage regulation and fault isolation circuit is used as the input port of the multi-isolated output buck unit; the input end of the inverter circuit is connected to the output end of the voltage regulation and fault isolation circuit, and the output end of the inverter circuit is connected to the multi-isolated conversion rectifier circuit; the multi-isolated conversion rectifier circuit has n output ends, and the n output ends are used as n outputs of the multi-isolated output buck unit.

[0064] In this embodiment, the divided voltage of the medium voltage DC input is converted in sequence by the voltage regulation and fault isolation circuit, the inverter circuit and the multi-isolation conversion rectifier circuit to obtain n voltage outputs; the multi-isolation output step-down unit has n output terminals A1B1~AnBn, and the output voltages are V1~Vn (i.e., n voltage outputs), and the output terminals of each multi-isolation output step-down unit are connected correspondingly.

[0065] The following is a further description of the multi-isolated conversion and rectification circuit in the multi-isolated output buck unit.

[0066] In some embodiments, the multi-isolated conversion rectifier circuit includes n isolated conversion rectifier circuits; the input side of each of the isolated conversion rectifier circuits is connected in parallel to the output end of the inverter circuit, and the output sides of each of the isolated conversion rectifier circuits are independent of each other and form n output ends of the multi-isolated conversion rectifier circuit.

[0067] In this embodiment, n isolated conversion rectifier circuits are arranged in the multi-isolated conversion rectifier circuit, the input sides of the n isolated conversion rectifier circuits are connected in parallel, and the output sides are independent of each other. These isolated conversion rectifier circuits are connected in parallel at the output end of the inverter circuit to form n output ends A1B1~AnBn of the multi-isolated conversion rectifier circuit, and the output voltages are V1~Vn respectively (i.e., n voltage outputs).

[0068] In some embodiments, the isolated conversion rectifier circuit includes a resonant inductor Lr, a resonant capacitor Cr, a magnetizing inductor Lm, a step-down AC transformer, a rectifier circuit and an output capacitor; one end of the resonant inductor Lr and one end of the resonant capacitor Cr are respectively connected to the two ends of the output side of the inverter circuit, the other end of the resonant inductor Lr and the other end of the resonant capacitor Cr are respectively connected to the two ends of the input side of the step-down AC transformer, and the magnetizing inductor Lm is connected in parallel to the input side of the step-down AC transformer; the output side of the step-down AC transformer is connected to the input side of the rectifier circuit, and the output side of the rectifier circuit is connected in parallel with the output capacitor to serve as the output of the isolated conversion rectifier circuit.

[0069] In this embodiment, the rectifier circuit adopts a bridge rectifier circuit; the resonant inductor Lr and the resonant capacitor Cr form an LC resonant circuit, and the magnetizing inductance Lm helps the switch tubes T1~T4 in the inverter circuit to achieve zero voltage opening; the step-down AC transformer Tr1~Trn plays the role of electrical isolation and voltage reduction; the full-bridge rectifier circuit composed of diodes Dr1~Dr4 plays the role of AC / DC conversion, realizing the conversion of AC voltage into DC voltage. In specific implementation, the resonant inductor can be externally matched, or replaced by the leakage inductance of the step-down AC transformer itself to reduce the system cost and volume; the resonant capacitor can be placed on the primary or secondary side of the step-down AC transformer; the magnetizing inductance can be externally matched, or the magnetizing inductance of the step-down AC transformer itself can be used to reduce the system cost and volume; the step-down AC transformer in each isolation conversion rectifier circuit can adopt different transformation ratios and capacities to meet the voltage levels of different electrolytic cells; the rectifier circuit adopts a bridge rectifier circuit or a full-wave rectifier circuit to reduce the current stress of the rectifier diode and the winding of the step-down AC transformer.

[0070] The voltage regulation and fault isolation circuit in the multi-isolated output buck unit is further described below.

[0071] In some embodiments, the voltage regulation and fault isolation circuit includes two bridge arm switches and a DC support capacitor; the two bridge arm switches include an upper tube S1 and a lower tube S2, a path is drawn from between the upper tube S1 and the lower tube S2 as the positive input terminal of the voltage regulation and fault isolation circuit, and a path is drawn from an end of the lower tube S2 away from the upper tube S1 as the negative input terminal of the voltage regulation and fault isolation circuit; the two ends of the two bridge arm switches are connected in parallel with the DC support capacitor as the output terminals of the voltage regulation and fault isolation circuit.

[0072] For the two bridge arm switches, the bridge arm switches are gate turn-off thyristors, high power transistors, power field effect transistors or insulated gate bipolar transistors connected in series; each bridge arm switch is composed of semiconductor devices of the same type connected in series, preferably two semiconductor devices connected in series. The DC support capacitor of this embodiment can play a buffering and isolation role, and can provide DC input for the step-down unit.

[0073] In this embodiment, the switch tube S1 and the switch tube S2 in the voltage regulation and fault isolation circuit can operate in PWM mode. By adjusting the duty cycle of the switch tube in the voltage regulation and fault isolation circuit in the multi-isolated buck units #1~#m, balanced control of the DC support capacitors Ch1~Chm voltages (i.e., voltages Vh1~Vhm) is achieved; specifically, by controlling the duty cycle of the lower tube S2 in the voltage regulation and fault isolation circuit in the multi-isolated buck units #1~#m (the upper tube and the lower tube are complementary), control of the voltages Vh1~Vhm is achieved, and its working mechanism is consistent with that of the traditional Boost circuit.

[0074] Since the inverter circuit switch tubes T1~T4 of each multi-isolated output step-down unit in the proposed modular DC hydrogen production power supply adopt a fixed 50% duty cycle control, when the voltage regulation and fault isolation circuits adopt the same duty cycle control, the automatic balancing of the DC support capacitors Ch1~Chm voltages can be achieved; the automatic balancing of the DC support capacitors Ch1~Chm voltages is conducive to simplifying the control complexity and can better meet the actual control needs.

[0075] The inverter circuit in the multi-isolated output buck unit is further described below.

[0076] In some embodiments, the inverter circuit is a four-arm switch. For the four-arm switch, the arm switches are gate turn-off thyristors, high-power transistors, power field-effect transistors or insulated gate bipolar transistors, either individually or in series. The device structures of the four arm switches need to remain the same. In the inverter circuit of this embodiment, the four-arm switch tubes T1 to T4 are controlled by a fixed duty cycle (preferably 50% in this embodiment) to achieve voltage conversion from the DC bus voltage Vh to the low-voltage bus voltage V1 to Vn.

[0077] The non-isolated module in the non-isolated regulation circuit is further described below.

[0078] In some embodiments, the non-isolated module adopts a buck converter. In this embodiment, the non-isolated module in the non-isolated regulation circuit adopts non-isolated topologies such as traditional buck and staggered buck. The traditional Buck structure is simple, and the staggered Buck has smaller requirements on the inductance or capacitance of passive devices than the traditional buck, so it is smaller in size. The non-isolated module in the accompanying drawings of this embodiment is a typical 3-phase staggered parallel buck circuit. The traditional buck, staggered buck and other non-isolated topologies are all prior art and will not be described in detail here.

[0079] This embodiment achieves closed-loop control of the voltage / current of each output port by adjusting the duty cycle of the non-isolated regulation circuit. Specifically, the Buck circuit duty cycle is adjusted based on a comparison between a reference given voltage or current value and the actual output voltage or current value, thereby adjusting the output voltage or current to reach the reference given value. The specific principle is that when the buck duty cycle is increased, the output voltage or current increases, and vice versa.

[0080] As a preferred technical solution, a bypass switch is connected in parallel on the input side of each of the multi-isolated output buck units. When a multi-isolated output buck unit fails, the bypass switch K1 is closed to bypass the faulty multi-isolated output buck unit. In this embodiment, the bypass switch can be closed by sending a drive closing signal to the bypass switch, which can conveniently and effectively bypass the faulty buck unit. In a specific implementation, if the bypass switch K1 is closed, the input current will flow through the bypass switch K1, and no longer pass through the switch S1 to flow through the subsequent inverter circuit. When a multi-isolated output buck unit is bypassed, m multi-isolated output buck units become m-1 multi-isolated output buck units. Due to its modular structure, the remaining circuit connection form does not change, only the bypassed unit no longer outputs power.

[0081] In a second aspect, a control method for a modular direct current hydrogen production power supply is also provided, which is applied to the modular direct current hydrogen production power supply as described above, and the control method comprises:

[0082] Adjusting the duty cycle of the switch tubes in each of the voltage regulation and fault isolation circuits to achieve balanced control of the output voltage of each of the voltage regulation and fault isolation circuits;

[0083] Using a fixed switching frequency and a fixed duty cycle to drive the switch tubes in each of the inverter circuits;

[0084] The duty cycle of the switch tube in each of the non-isolated modules is adjusted to achieve closed-loop control of the voltage / current at the output port of each of the non-isolated modules.

[0085] The control block diagram of the modular DC hydrogen production power supply in this embodiment is as follows: Figure 6As shown, the control block diagram is further explained below.

[0086] In this embodiment, the voltages Vh1~Vhm of each module (i.e., the voltage regulation and fault isolation circuit) are collected and summed to obtain the total voltage Vh, and then closed-loop control is performed by referring to the given voltage and the actual total voltage Vh to adjust the duty cycle of the switch tubes S1~S2 of each module (i.e., the voltage regulation and fault isolation circuit), so that the actual total voltage Vh tracks the reference given voltage, wherein the duty cycles of S1~S2 of each module (i.e., the voltage regulation and fault isolation circuit) are consistent.

[0087] In this embodiment, the inverter circuit switch tubes T1~T4 of each multi-isolated output buck unit adopt a pair of tubes (T1 and T4 are a pair of tubes, T2 and T3 are a pair of tubes) with consistent duty cycles, and the upper and lower tubes of the same bridge arm (T1 and T2 are upper and lower tubes, T3 and T4 are upper and lower tubes) are controlled by a driving signal with complementary duty cycles, and the duty cycle is 50%.

[0088] In this embodiment, the output voltage / current of the non-isolated regulation circuit is collected, and then closed-loop control is performed by referring to the given voltage / current and the actual voltage / current to adjust the duty cycle of the switch tubes Q1~Q3, so that the actual voltage / current tracks the reference given voltage, wherein the duty cycles of the switch tubes Q1~Q3 are consistent. Figure 1-2 The China-Africa isolation module is a typical 3-phase interleaved parallel buck circuit.

[0089] In summary, in response to the application requirements of off-grid hydrogen production systems based on renewable energy, which require a large power regulation range, fast response speed, and adaptability to the volatility and intermittency of renewable energy, the embodiments of the present invention propose a modular DC hydrogen production power supply topology and control for large-scale renewable energy hydrogen production systems, which can achieve mixed access of various types of electrolyzers and flexibly isolate fault circuits, thereby increasing the new energy consumption rate and improving system reliability, thereby achieving efficient and highly reliable renewable energy hydrogen production development.

[0090] Based on the same inventive concept, the present invention also provides a computer-readable storage medium storing one or more programs, which, when executed, can implement the control method of the modular direct current hydrogen production power supply as described above.

[0091] Based on the same inventive concept, the present invention also provides an electronic device, such as Figure 7 As shown, it includes a processor, a communication interface, a computer-readable storage medium as described above, and a communication bus; wherein the processor, the communication interface, and the computer-readable storage medium communicate with each other via the communication bus; and the processor is used to execute the program stored in the computer-readable storage medium.

[0092] In the above embodiments, the description of each embodiment has its own emphasis. For the part not described in detail in one embodiment, please refer to the relevant description of other embodiments. The parts not involved in the above embodiments are the same as the prior art or can be implemented by the prior art, and no further description is given here.

[0093] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modular direct current hydrogen production power supply, characterized in that: It includes a boost inductor, m multiple isolated output buck units, and a non-isolated regulation circuit; The non-isolated regulation circuit includes n non-isolated modules; One end of the boost inductor is connected to the positive input end of the hydrogen production power supply, and the input side of each of the multi-isolated output buck units is connected in series between the other end of the boost inductor and the negative input end of the hydrogen production power supply, and the n outputs of each of the multi-isolated output buck units are connected in parallel and then respectively connected to the n non-isolated modules; The output ports of the non-isolated modules are connected in parallel, independently or partially in parallel as the output of the hydrogen production power supply.

2. A modular direct current hydrogen production power supply according to claim 1, characterized in that: The multi-isolated output buck unit includes a voltage regulation and fault isolation circuit, an inverter circuit and a multi-isolated conversion and rectification circuit; Using the input end of the voltage regulation and fault isolation circuit as the input port of the multi-isolated output buck unit; The input end of the inverter circuit is connected to the output end of the voltage regulation and fault isolation circuit, and the output end of the inverter circuit is connected to the multi-isolation conversion rectifier circuit; The multi-isolated conversion and rectification circuit has n output terminals, and the n output terminals are used as n outputs of the multi-isolated output buck unit.

3. A modular direct current hydrogen production power supply according to claim 2, characterized in that: The multi-isolation conversion rectifier circuit includes n isolation conversion rectifier circuits; The input side of each of the isolated conversion and rectification circuits is connected in parallel to the output end of the inverter circuit, and the output sides of each of the isolated conversion and rectification circuits are independent of each other and form n output ends of the multiple isolated conversion and rectification circuits.

4. A modular direct current hydrogen production power supply according to claim 3, characterized in that: The isolated conversion rectifier circuit includes a resonant inductor, a resonant capacitor, a magnetizing inductor, a step-down AC transformer, a rectifier circuit and an output capacitor; One end of the resonant inductor and one end of the resonant capacitor are respectively connected to two ends of the output side of the inverter circuit, the other end of the resonant inductor and the other end of the resonant capacitor are respectively connected to two ends of the input side of the step-down AC transformer, and the magnetizing inductor is connected in parallel to the input side of the step-down AC transformer; The output side of the step-down AC transformer is connected to the input side of the rectifier circuit, and the output side of the rectifier circuit is connected in parallel with the output capacitor to serve as the output of the isolation conversion rectifier circuit.

5. A modular direct current hydrogen production power supply according to claim 2, characterized in that: The voltage regulation and fault isolation circuit includes two bridge arm switches and a DC support capacitor; The two-arm switch includes an upper tube and a lower tube, a path is led out from between the upper tube and the lower tube as the positive input end of the voltage regulation and fault isolation circuit, and a path is led out from an end of the lower tube away from the upper tube as the negative input end of the voltage regulation and fault isolation circuit; The two ends of the two bridge arm switches are connected in parallel with the DC support capacitor and serve as output ends of the voltage regulation and fault isolation circuit.

6. A modular direct current hydrogen production power supply according to claim 2, characterized in that: The inverter circuit is a four-arm switch; The non-isolated module adopts a buck converter.

7. A modular direct current hydrogen production power supply according to any one of claims 1 to 6, characterized in that: A bypass switch is connected in parallel to the input side of each of the multi-isolation output buck units.

8. A control method for a modular direct current hydrogen production power supply, applied to the modular direct current hydrogen production power supply according to any one of claims 2 to 7, characterized in that: The control method comprises: Adjusting the duty cycle of the switch tubes in each of the voltage regulation and fault isolation circuits to achieve balanced control of the output voltage of each of the voltage regulation and fault isolation circuits; Using a fixed switching frequency and a fixed duty cycle to drive the switch tubes in each of the inverter circuits; The duty cycle of the switch tube in each of the non-isolated modules is adjusted to achieve closed-loop control of the voltage / current at the output port of each of the non-isolated modules.

9. A computer-readable storage medium storing one or more programs, characterized in that: When the one or more programs are executed, the control method of the modular direct current hydrogen production power supply described in claim 8 can be implemented.

10. An electronic device comprising a processor, a communication interface, the computer-readable storage medium of claim 9, and a communication bus; wherein: The processor, the communication interface, and the computer-readable storage medium communicate with each other via a communication bus; It is characterized in that The processor is configured to execute a program stored in a computer-readable storage medium.

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