High-capacity direct-current hydrogen production power supply with multi-winding integrated transformer

Abstract

The invention relates to the technical field of topological structures of power systems, and discloses a high-capacity direct-current hydrogen production power supply with a multi-winding integrated transformer, which comprises a clamping circuit, an inverter circuit, a multi-winding isolation conversion rectifying circuit and a non-isolation regulating circuit which are connected in sequence, the input end of the multi-winding isolation conversion rectification circuit is connected with the output end of the inverter circuit, and the output ends of the multi-winding isolation conversion rectification circuit are mutually independent; the input ends of the non-isolated regulating circuits are connected with the output ends of the multi-winding isolated conversion rectifying circuits in a one-to-one correspondence manner, the output ends of the non-isolated regulating circuits adopt a single-path port output manner or a multi-path port output manner, and the output ends of the non-isolated regulating circuits are connected with the electrolytic bath. The requirements of different electrolytic cell capacities and voltage grades are met, the capacity and power density of the direct-current hydrogen production power supply are greatly improved, and the application requirements of renewable energy source volatility, intermittency and engineering compactness are met.

Description

Technical Field

[0001] The present invention relates to the technical field of power system topologies, and particularly to a large-capacity DC hydrogen production power supply with a multi-winding integrated transformer. Background Art

[0002] With the expansion of the scale of renewable energy hydrogen production systems, the requirements for the output voltage level and capacity of related hydrogen production power supplies are getting higher and higher. The large capacity of new energy power generation makes the capacity of converters continuously increase, and it is necessary to use power devices with higher power levels or adopt a topology structure of multiple low-voltage converters in parallel to meet the requirements of high-power conversion.

[0003] However, the power of the multi-low-voltage converter parallel structure is only applicable to low-voltage occasions, and the capacity of the hydrogen production power supply will not be able to meet the application requirements of future large-scale renewable energy medium-voltage DC off-grid hydrogen production. Summary of the Invention

[0004] In view of this, the present invention provides a large-capacity DC hydrogen production power supply with a multi-winding integrated transformer to solve the problem that the capacity of the hydrogen production power supply will not be able to meet the application requirements of future large-scale renewable energy medium-voltage DC off-grid hydrogen production.

[0005] In a first aspect, the present invention provides a large-capacity DC hydrogen production power supply with a multi-winding integrated transformer, including:

[0006] A clamping circuit, an inverter circuit, a multi-winding isolation transformation rectification circuit, and a non-isolation regulation circuit connected in sequence; the input end of the multi-winding isolation transformation rectification circuit is connected to the output end of the inverter circuit, and the output ends of the multi-winding isolation transformation rectification circuit are independent of each other; the input end of the non-isolation regulation circuit is connected to the output end of the multi-winding isolation transformation rectification circuit in a one-to-one correspondence, the output end of the non-isolation regulation circuit adopts a single-channel port output mode or a multi-channel port output mode, and the output end of the non-isolation regulation circuit is connected to the electrolyzer.

[0007] For the large-capacity DC hydrogen production power supply provided by the present invention, the output end of the non-isolation regulation circuit adopts a single-channel port output mode or a multi-channel port output mode, which meets the requirements of different electrolyzer capacities and voltage levels, can support the power conversion from medium-voltage DC to multiple types of low-voltage electrolyzers, has a multi-winding integrated transformer structure and distributed multi-port output capabilities, greatly improves the capacity and power density of the DC hydrogen production power supply, and adapts to the application requirements of the volatility, intermittency of renewable energy, and engineering compactness.

[0008] In an optional embodiment, the multi-winding isolation transformation rectification circuit includes:

[0009] A resonant inductor, a resonant capacitor, a magnetization inductor, a multi-winding step-down AC transformer, a plurality of rectifier circuits and a plurality of first output capacitors; the resonant inductor, the resonant capacitor and the magnetization inductor are connected in series, both ends of the magnetization inductor are connected to the input end of the multi-winding step-down AC transformer, a plurality of output ends of the multi-winding step-down AC transformer are respectively connected to the plurality of rectifier circuits, and the first output capacitors are connected in parallel at both ends of each rectifier circuit.

[0010] A large-capacity DC hydrogen production power supply with a multi-winding integrated transformer provided by the present invention. A multi-winding isolation conversion rectifier circuit is provided with a multi-winding step-down AC transformer, so that the large-capacity DC hydrogen production power supply has a compact structure. The multi-winding step-down AC transformer can adopt different turns ratios to meet the voltage levels of different electrolyzers. The rectifier circuit rectifies the alternating current of the multi-winding step-down AC transformer into direct current to provide an input DC voltage for the non-isolated regulation circuit.

[0011] In an optional embodiment, the multi-winding step-down AC transformer includes an input end and a plurality of output ends, and the plurality of output ends of the multi-winding step-down AC transformer are independent of each other.

[0012] In an optional embodiment, a clamping circuit includes:

[0013] An anode reactance, a plurality of clamping diodes, a clamping resistor and a clamping capacitor; the anode reactance, the plurality of clamping diodes and the clamping capacitor are connected in series, and the series connection structure of the anode reactance and the plurality of clamping diodes is connected in parallel with the clamping resistor.

[0014] A large-capacity DC hydrogen production power supply with a multi-winding integrated transformer provided by the present invention. The clamping circuit can, on the one hand, limit the current change rate when the bridge arm switching tubes in the inverter circuit are turned on, and on the other hand, can limit the oscillation amplitude of the voltage at the AC output port of the inverter circuit.

[0015] In an optional embodiment, the clamping circuit further includes:

[0016] A first static voltage-sharing resistor and a first dynamic voltage-sharing circuit. The first static voltage-sharing resistor, the first dynamic voltage-sharing circuit and the clamping diodes are connected in parallel; the first dynamic voltage-sharing circuit includes a dynamic voltage-sharing resistor and a dynamic voltage-sharing capacitor, and the dynamic voltage-sharing resistor and the dynamic voltage-sharing capacitor are connected in series.

[0017] In an optional embodiment, an inverter circuit includes:

[0018] Multiple bridge arm switches, which form an H-bridge circuit; each bridge arm switch includes multiple fully controlled devices, the multiple fully controlled devices are connected in series, and each fully controlled device is respectively connected in parallel with a second static voltage-sharing resistor, a second dynamic voltage-sharing circuit, and an antiparallel diode.

[0019] A large-capacity DC hydrogen production power supply with a multi-winding integrated transformer provided by the present invention, the multiple bridge arm switches adopt fixed duty cycle control, realizing the voltage level conversion from the medium-voltage DC bus to the low-voltage bus.

[0020] In an optional implementation manner, the fully controlled device adopts a gate turn-off thyristor, or a high-power transistor, or a power field effect transistor, or an insulated gate bipolar transistor.

[0021] In an optional implementation manner, the non-isolated regulation circuit includes:

[0022] Multiple regulation circuits, the input ends of the multiple regulation circuits are independent of each other and are respectively connected to the output ends of the multi-winding isolation conversion rectification circuit in one-to-one correspondence, and the output ends of the multiple regulation circuits adopt an independent output mode or a parallel connection mode.

[0023] A large-capacity DC hydrogen production power supply with a multi-winding integrated transformer provided by the present invention, the output ports of the non-isolated regulation circuit can adopt a parallel or independent output form, so as to meet the requirements of different electrolyzer capacities and voltage levels, and realize the closed-loop control of the voltage / current of each output port by adjusting the duty cycle of the non-isolated regulation circuit.

[0024] In an optional implementation manner, each regulation circuit includes:

[0025] Multiple switching tubes, multiple diodes, multiple filter reactances, and a second output capacitor; the multiple switching tubes, multiple diodes, and multiple filter reactances form a non-isolated topology structure, and the non-isolated topology structure is connected to the second output capacitor.

[0026] In an optional implementation manner, an input DC capacitor, and the input DC capacitor is connected to the clamping circuit. Description of the Drawings

[0027] In order to more clearly illustrate the specific implementation manners of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific implementation manners or the prior art. Obviously, the drawings in the following description are some implementation manners of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1It is a schematic structural diagram of a high-capacity DC hydrogen production power supply with a multi-winding integrated transformer according to an embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of a full-wave rectifier circuit according to an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram in which the output ends of multiple adjustment circuits according to an embodiment of the present invention are connected in parallel;

[0031] Figure 4 It is a schematic diagram in which the output ends of multiple adjustment circuits according to an embodiment of the present invention are independently output;

[0032] Figure 5 It is a schematic diagram of an adjustment circuit adopting multi-phase interleaved buck according to an embodiment of the present invention. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Hydrogen energy is the best way for large-scale and long-term storage of renewable energy. 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 fields are wide. Therefore, the proportion of new energy in the future power system will be further increased. However, the volatility of new energy poses a great challenge to the stability of the power grid. There is an urgent need for stable and periodic energy storage and regulation to achieve cross-seasonal and long-term power and electricity regulation. Off-grid hydrogen production is an effective means.

[0035] The output of photovoltaic solar panels is direct current, and the power supply requirement of the electrolyzer is also a direct current power supply. Therefore, compared with the AC collection scheme, the large-scale new energy collection through DC can reduce the conversion link, improve the power transmission efficiency and reduce the cost; in addition, compared with the AC hydrogen production scheme, the DC hydrogen production system has higher power quality, better stability, fast and reliable power regulation, low transmission loss and other advantages, and is considered to be a more promising topological structure.

[0036] The large-capacity of new energy power generation has led to a continuous increase in the capacity of the converter. It is necessary to use power devices with higher power ratings or adopt a topology structure in which multiple low-voltage converters are connected in parallel to meet the requirements of high-power conversion. Among them, the structure of multiple low-voltage converters connected in parallel has flexible redundancy control characteristics and can effectively improve the reliability of the system. However, when the load is low, its efficiency is much lower than that under the rated operating conditions, and control strategies need to be adopted to optimize and improve the overall efficiency of the parallel system.

[0037] At present, the power of the structure of multiple low-voltage converters connected in parallel is generally lower than 10 MW (megawatt). As the power increases to more than 10 MW, the low DC bus voltage will cause increased line losses and short transmission distances, and challenges are faced in improving the operating efficiency of the hydrogen production system. The applicability of the low-voltage parallel scheme needs to be studied.

[0038] Generally speaking, the DC off-grid hydrogen production technology has received extensive attention globally, but the related DC / DC (DC chopper) hydrogen production power supply products are only applicable to low-voltage occasions and cannot meet the application requirements of future large-scale renewable energy medium-voltage DC off-grid hydrogen production.

[0039] To solve the above problems, this embodiment provides a large-capacity DC hydrogen production power supply with a multi-winding integrated transformer, as Figure 1 shown, including:

[0040] A clamping circuit 101, an inverter circuit 102, a multi-winding isolation conversion rectification circuit 103, and a non-isolation regulation circuit 104 connected in sequence; the input end of the multi-winding isolation conversion rectification circuit 103 is connected to the output end of the inverter circuit 102, and the output ends of the multi-winding isolation conversion rectification circuit 103 are independent of each other; the input end of the non-isolation regulation circuit 104 is connected to the output end of the multi-winding isolation conversion rectification circuit 103 in a one-to-one correspondence, the output end of the non-isolation regulation circuit 104 adopts a single-path port output mode or a multi-path port output mode, and the output end of the non-isolation regulation circuit 104 is connected to the electrolytic cell.

[0041] Specifically, the connection mode of the output end of the non-isolated regulation circuit 104 is determined by the required capacity of the electrolyzer; for example, usually the capacity and voltage level of a PEM (Proton Exchange Membrane) electrolyzer are relatively low, with a capacity below 1 MW. The capacity of a single output port of the non-isolated regulation circuit 104 can meet the requirements. Therefore, the non-isolated regulation circuit 104 adopts a multi-port output mode, and the PEM electrolyzer can be connected to one of the output ports of the non-isolated regulation circuit 104; for an alkaline electrolyzer, the single-unit capacity can reach 5 MW or even more than 10 MW. Multiple output ends of isolation transformers need to be connected in parallel to the electrolyzer after passing through the non-isolated regulation circuit 104 to meet the requirements of the alkaline electrolyzer. Therefore, the output end of the non-isolated regulation circuit 104 adopts a single-port output mode.

[0042] Further, when the large-capacity DC hydrogen production power supply is working, the input voltage U p After being limited in current by the clamping circuit 101, it passes through the inverter circuit 102 to chop the input voltage U p The inverter circuit 102 outputs a square wave. The square wave passes through the multi-winding isolation conversion rectification circuit 103, is converted from AC to DC output, realizes the establishment of each voltage V1 - Vn in the multi-isolation rectification conversion circuit, and finally obtains the output voltage Vo through the non-isolated circuit.

[0043] A large-capacity DC hydrogen production power supply with a multi-winding integrated transformer provided by the present invention, the output end of the non-isolated regulation circuit adopts a single-port output mode or a multi-port output mode, which meets the requirements of different electrolyzer capacities and voltage levels, can support the power conversion of medium-voltage DC to low-voltage various types of electrolyzers, has a multi-winding integrated transformer structure and distributed multi-port output capabilities, greatly improves the capacity and power density of the DC hydrogen production power supply, and adapts to the application requirements of the volatility, intermittency of renewable energy and the compactness of the project.

[0044] In some optional embodiments, the multi-winding isolation conversion rectification circuit 103 includes:

[0045] A resonance inductor 1031, a resonance capacitor 1032, a magnetization inductor 1033, a multi-winding step-down AC transformer 1034, a plurality of rectification circuits 1035 and a plurality of first output capacitors 1036; the resonance inductor 1031, the resonance capacitor 1032 and the magnetization inductor 1033 are connected in series, both ends of the magnetization inductor 1033 are connected to the input end of the multi-winding step-down AC transformer 1034, multiple output ends of the multi-winding step-down AC transformer 1034 are respectively connected to the plurality of rectification circuits 1035, and both ends of each rectification circuit 1035 are connected in parallel with the first output capacitor 1036.

[0046] Specifically, the multi-winding step-down AC transformer 1034 includes an input terminal and multiple output terminals, and the multiple output terminals of the multi-winding step-down AC transformer 1034 are independent of each other; as Figure 1 shown, the primary side Np of the multi-winding step-down AC transformer 1034 is connected to both ends of the magnetization inductor 1033, and the secondary sides S1 - S n of the multi-winding step-down AC transformer 1034 are respectively connected to multiple rectifier circuits 1035.

[0047] Further, the structure of the multi-winding step-down AC transformer 1034 may include an iron core, a primary winding, and multiple secondary windings. The primary winding and the multiple secondary windings are wound around the iron core. The primary winding is connected to the magnetization inductor 1033, and the multiple secondary windings are respectively connected to the multiple rectifier circuits 1035.

[0048] Further, the multi-winding step-down AC transformer 1034 can adopt different turns ratios to meet the voltage levels of different electrolyzers.

[0049] Further, the resonance inductor 1031 can be externally configured, or the leakage inductance of the multi-winding step-down AC transformer 1034 itself can be used to replace it, thereby reducing the system cost and volume.

[0050] Further, the magnetization inductor 1033 can be externally configured, or the magnetization inductor of the transformer itself can be used to reduce the system cost and volume.

[0051] Further, the resonance capacitor 1032 is arranged on the primary side of the multi-winding step-down AC transformer 1034, or is distributed on the secondary sides of the multi-winding step-down AC transformer 1034.

[0052] Further, the rectifier circuit 1035 is composed of multiple rectifier diodes. The rectifier circuit 1035 adopts a bridge rectifier circuit or a full-wave rectifier circuit to reduce the current stress on the rectifier diodes and the transformer windings. The full-wave rectifier circuit is as Figure 2 shown.

[0053] A large-capacity DC hydrogen production power supply with a multi-winding integrated transformer provided by the present invention sets a multi-winding step-down AC transformer in the multi-winding isolation conversion rectifier circuit, so that the large-capacity DC hydrogen production power supply has a compact structure. The multi-winding step-down AC transformer can adopt different turns ratios to meet the voltage levels of different electrolyzers. The rectifier circuit rectifies the alternating current of the multi-winding step-down AC transformer into direct current to provide an input DC voltage for the non-isolated regulation circuit.

[0054] In some alternative embodiments, the clamping circuit 101 includes:

[0055] Anode reactance 1011, multiple clamping diodes 1012, clamping resistor 1013, and clamping capacitor 1014; the anode reactance 1011, multiple clamping diodes 1012, and clamping capacitor 1014 are connected in series, and the series connection structure of the anode reactance 1011 and multiple clamping diodes 1012 is connected in parallel with the clamping resistor 1013.

[0056] A large-capacity DC hydrogen production power supply with a multi-winding integrated transformer provided by the present invention. On the one hand, the clamping circuit limits the rate of change of current when the bridge arm switching tubes in the inverter circuit are turned on. On the other hand, it can limit the oscillation amplitude of the voltage at the AC output port of the inverter circuit.

[0057] In some alternative embodiments, the clamping circuit 101 further includes:

[0058] A first static voltage-sharing resistor 1015 and a first dynamic voltage-sharing circuit 1016. The first static voltage-sharing resistor 1015, the first dynamic voltage-sharing circuit 1016, and the clamping diodes 1012 are connected in parallel; the first dynamic voltage-sharing circuit 1016 includes a dynamic voltage-sharing resistor and a dynamic voltage-sharing capacitor, and the dynamic voltage-sharing resistor and the dynamic voltage-sharing capacitor are connected in series.

[0059] In some alternative embodiments, the inverter circuit 102 includes:

[0060] Multiple bridge arm switches that form an H-bridge circuit; each bridge arm switch includes multiple fully controlled devices 1021, the multiple fully controlled devices 1021 are connected in series, and each fully controlled device 1021 is respectively connected in parallel with a second static voltage-sharing resistor 1022, a second dynamic voltage-sharing circuit 1023, and an anti-parallel diode 1024.

[0061] Specifically, when the large-capacity DC hydrogen production power supply operates, the fully controlled device 1021 is controlled with a fixed duty cycle of 50% to control the establishment of the voltages V1 to Vn in the multi-isolation rectification and transformation circuit, thereby realizing the voltage level transformation from the medium-voltage DC bus to the low-voltage bus.

[0062] Furthermore, the circuit structure of the second dynamic voltage-sharing circuit 1023 is the same as that of the first dynamic voltage-sharing circuit 1016.

[0063] A large-capacity DC hydrogen production power supply with a multi-winding integrated transformer provided by the present invention. Multiple bridge arm switches are controlled with a fixed duty cycle, realizing the voltage level transformation from the medium-voltage DC bus to the low-voltage bus.

[0064] In some alternative embodiments, the fully controlled device 1021 is a gate turn-off thyristor, or a high-power transistor, or a power field-effect transistor, or an insulated gate bipolar transistor.

[0065] Specifically, when power field effect transistors or insulated gate bipolar transistor devices are connected in series, the clamping circuit 101 can be adopted or the clamping circuit 101 can be removed.

[0066] In some alternative embodiments, the non-isolated regulation circuit 104 includes:

[0067] A plurality of regulation circuits 1041, the input ends of the plurality of regulation circuits 1041 are independent of each other and are respectively connected to the output end of the multi-winding isolation conversion rectification circuit 103 in one-to-one correspondence, and the output ends of the plurality of regulation circuits 1041 adopt an independent output mode or a parallel connection mode.

[0068] Specifically, the output ports of the non-isolated regulation circuit 104 can adopt a parallel or independent form to meet the requirements of different electrolyzer capacities and voltage levels; as Figure 3 shown, when the capacity and voltage level of a single electrolyzer are relatively high, a single-channel output form is adopted for a single electrolyzer, that is, the output ends of the plurality of regulation circuits 1041 are connected in parallel, and the output voltage is V o , and V o is used to supply power to the electrolyzer; as Figure 4 shown, when the capacities and voltage levels of a plurality of electrolyzers are relatively low, a multi-channel output form is adopted for a plurality of electrolyzers, that is, the output ends of the plurality of regulation circuits 1041 adopt an independent output mode, and the output voltage corresponding to the output end of each regulation circuit 1041 is V o1 , V o2 ....V on , and the regulation circuit 1041 transmits its respective output voltage to the electrolyzer connected thereto for power supply.

[0069] Furthermore, when there are a plurality of electrolyzers and the capacities and voltage levels of the plurality of electrolyzers are different, a multi-channel output form is adopted for the plurality of electrolyzers, that is, the output ends of the plurality of regulation circuits 1041 adopt a partially parallel manner, and the number of output ports connected in parallel can be set according to the capacity and voltage level of the electrolyzer, and the output ports of the remaining regulation circuits 1041 are independently output.

[0070] For a large-capacity DC hydrogen production power supply with a multi-winding integrated transformer provided by the present invention, the output ports of the non-isolated regulation circuit can adopt a parallel or independent output form, so as to meet the requirements of different electrolyzer capacities and voltage levels, and realize the closed-loop control of the voltage / current of each output port by adjusting the duty ratio of the non-isolated regulation circuit.

[0071] In some alternative embodiments, each regulation circuit 1041 includes:

[0072] A plurality of switching tubes 10411, a plurality of diodes 10412, a plurality of filter reactances 10413, and a second output capacitor 10414; the plurality of switching tubes 10411, the plurality of diodes 10412, and the plurality of filter reactances 10413 form a non-isolated topology structure, and the non-isolated topology structure is connected to the second output capacitor 10414.

[0073] Specifically, the non-isolated topology structure can adopt a traditional buck (a circuit type) structure or an interleaved buck structure, and the interleaved buck structure is as Figure 5 shown.

[0074] Furthermore, 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 104, that is, each regulation circuit 1041 is provided with a controller, and the controller detects the output current of the regulation circuit 1041. If the output voltage / current does not reach the preset voltage / current value, the duty cycle is increased by adjusting the switching tube 10411 to increase the output voltage / output current of the non-isolated regulation circuit 104 to reach the preset voltage / current value.

[0075] In some alternative embodiments, it further includes: an input DC capacitor 105, and the input DC capacitor 105 is connected to the clamping circuit 101.

[0076] Specifically, when the large-capacity DC hydrogen production power supply works, the input DC capacitor 105 is used to stabilize the input voltage U p .

[0077] The following uses a specific embodiment to illustrate the working process of a large-capacity DC hydrogen production power supply with a multi-winding integrated transformer.

[0078] Embodiment 1:

[0079] When the large-capacity DC hydrogen production power supply works, the input DC capacitor C p is used to stabilize the input voltage U p , and the input voltage U p is sent to the clamping circuit. The clamping circuit is composed of an anode reactance L buf , a clamping diode D buf1 -D bufn , a clamping resistor R buf , and a clamping capacitor C buf . On the one hand, the clamping circuit can limit the current change rate when the switching tube in the inverter circuit is turned on, and on the other hand, it can limit the oscillation amplitude of the voltage at the AC output port of the inverter circuit, and then send the current-limited voltage to the inverter circuit.

[0080] The four-leg switching transistors (i.e., anti-parallel diodes) T11-T1n, T21-T2n, T31-T3n, and T41-T4n in the inverter circuit are controlled with a fixed duty cycle of 50%, thereby realizing the establishment of voltages V1-Vn in multiple isolated rectification conversion circuits, that is, realizing the voltage conversion from the medium-voltage DC bus to the low-voltage bus.

[0081] The multi-winding isolated conversion rectifier circuit consists of a resonant inductor L r , a resonant capacitor C r , a magnetization inductor L m , a multi-winding step-down AC transformer, a bridge rectifier circuit, and a first output capacitor C ro The bridge rectifier circuit is composed of four rectifier diodes D r1 -D r4 The multi-winding isolated conversion rectifier circuit converts alternating current into direct current, and the respective output terminals of the multi-winding isolated conversion rectifier circuit complete the establishment of voltages V1-Vn.

[0082] The non-isolated regulation circuit is composed of multiple regulation circuits, and each regulation circuit is composed of multiple switching transistors Q b1 -Q b4 , multiple diodes D b1 -D b4 , multiple filter reactances L b1 -L b4 and a second output capacitor C bo The output ports of the non-isolated regulation circuit can be in the form of parallel, independent, or partial parallel connection, so as to meet the requirements of different electrolyzer capacities, and realize the closed-loop control of the voltage / current of each output port by adjusting the duty cycle of the non-isolated regulation circuit.

[0083] In the above-mentioned Embodiment 1, aiming at the requirements of large power regulation range, fast response speed of the renewable energy off-grid hydrogen production system, and adapting to the volatility, intermittency of renewable energy, and the compactness of engineering applications, it is used for large-scale renewable energy DC hydrogen production power supply, has a compact structure, can realize the mixed access of various types of electrolyzers, improve the new energy consumption rate, and realize the efficient, compact, and low-cost hydrogen production development of renewable energy.

[0084] In the description of the present application, unless otherwise specified, "multiple" means two or more than two. In addition, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, terms such as "first", "second", and "third" are used to distinguish the same items or similar items with basically the same functions and effects. Those skilled in the art can understand that the terms "first", "second", "third", etc. do not limit the quantity and execution order, and the terms "first", "second", "third", etc. do not necessarily limit being different.

[0085] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A high-capacity DC hydrogen production power supply with a multi-winding integrated transformer, characterized in that, Comprising: A clamping circuit, an inverter circuit, a multi-winding isolation conversion rectification circuit, and a non-isolation regulation circuit connected in sequence; the input end of the multi-winding isolation conversion rectification circuit is connected to the output end of the inverter circuit, and the output ends of the multi-winding isolation conversion rectification circuit are independent of each other; the input ends of the non-isolation regulation circuit are connected to the output ends of the multi-winding isolation conversion rectification circuit in a one-to-one correspondence, the output end of the non-isolation regulation circuit adopts a single-channel port output mode or a multi-channel port output mode, and the output end of the non-isolation regulation circuit is connected to the electrolytic cell.

2. The high-capacity DC hydrogen production power supply with a multi-winding integrated transformer according to claim 1, characterized in that The multi-winding isolation conversion rectification circuit includes: A resonant inductor, a resonant capacitor, a magnetization inductor, a multi-winding step-down AC transformer, a plurality of rectification circuits, and a plurality of first output capacitors; the resonant inductor, the resonant capacitor, and the magnetization inductor are connected in series, both ends of the magnetization inductor are connected to the input end of the multi-winding step-down AC transformer, a plurality of output ends of the multi-winding step-down AC transformer are respectively connected to the plurality of rectification circuits, and both ends of each rectification circuit are connected in parallel with the first output capacitor.

3. The high-capacity DC hydrogen production power supply with a multi-winding integrated transformer according to claim 2, wherein, The multi-winding step-down AC transformer includes an input end and a plurality of output ends, and the plurality of output ends of the multi-winding step-down AC transformer are independent of each other.

4. The large-capacity DC hydrogen production power supply with a multi-winding integrated transformer according to claim 1, characterized in that, The clamping circuit includes: An anode reactance, a plurality of clamping diodes, a clamping resistor, and a clamping capacitor; the anode reactance, the plurality of clamping diodes, and the clamping capacitor are connected in series, and the series connection structure of the anode reactance and the plurality of clamping diodes is connected in parallel with the clamping resistor.

5. The large-capacity DC hydrogen production power supply with a multi-winding integrated transformer according to claim 4, characterized in that, The clamping circuit further includes: A first static voltage-sharing resistor and a first dynamic voltage-sharing circuit, the first static voltage-sharing resistor, the first dynamic voltage-sharing circuit, and the clamping diode are connected in parallel; the first dynamic voltage-sharing circuit includes a dynamic voltage-sharing resistor and a dynamic voltage-sharing capacitor, and the dynamic voltage-sharing resistor and the dynamic voltage-sharing capacitor are connected in series.

6. The high-capacity DC hydrogen production power supply with a multi-winding integrated transformer according to claim 1, characterized in that, The inverter circuit includes: A plurality of bridge arm switches, and the plurality of bridge arm switches form an H-bridge circuit; each bridge arm switch includes a plurality of fully controlled devices, the plurality of fully controlled devices are connected in series, and each fully controlled device is respectively connected in parallel with a second static voltage-sharing resistor, a second dynamic voltage-sharing circuit, and an anti-parallel diode.

7. A high-capacity DC hydrogen production power supply with a multi-winding integrated transformer according to claim 6, characterized in that, The fully controlled device adopts a gate turn-off thyristor, or a high-power transistor, or a power field effect transistor, or an insulated gate bipolar transistor.

8. A high-capacity DC hydrogen production power supply with a multi-winding integrated transformer according to claim 1, characterized in that, The non-isolation regulation circuit includes: A plurality of regulation circuits, the input ends of the plurality of regulation circuits are independent of each other and are connected to the output ends of the multi-winding isolation conversion rectification circuit in a one-to-one correspondence, and the output ends of the plurality of regulation circuits adopt an independent output mode or a parallel connection mode.

9. A high-capacity DC hydrogen production power supply with a multi-winding integrated transformer according to claim 8, characterized in that, Each regulation circuit includes: A plurality of switching tubes, a plurality of diodes, a plurality of filter reactances, and a second output capacitor; the plurality of switching tubes, the plurality of diodes, and the plurality of filter reactances form a non-isolation topology structure, and the non-isolation topology structure is connected to the second output capacitor.

10. The high-capacity DC hydrogen production power supply with a multi-winding integrated transformer according to claim 1, characterized in that, It further includes: An input DC capacitor, and the input DC capacitor is connected to the clamping circuit.

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