Hydrogen light integrated unified power quality conditioner and control method

Abstract

The application discloses a hydrogen and light integrated unified power quality conditioner and a control method, comprising a unified power quality conditioner, a photovoltaic boost circuit and a hydrogen energy converter connected with a system DC bus respectively. The hydrogen and light integrated unified power quality conditioner is constructed through cooperation between the unified power quality conditioner, the photovoltaic boost circuit and the electrolytic cell and the hydrogen energy converter. The hydrogen energy converter comprises a main DC-DC circuit, a ripple compensation circuit and a bypass circuit. The bypass circuit is used for a DC separation capacitor in the ripple compensation circuit. The addition of the bypass circuit enables the ripple compensation circuit to have a transmission power capacity. The application proposes an output current ripple priority fault-tolerant control method and a power ripple priority fault-tolerant control method. The application has the functions of green hydrogen production and power quality regulation through multi-energy complementary power generation. Meanwhile, the hydrogen energy converter in the system has the characteristics of small ripple and high reliability of fault-tolerant operation.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and in particular to a hydrogen-photonic integrated unified power quality regulator and control method. Background Technology

[0002] To address the stringent requirements for power quality and reliability in modern high-tech equipment manufacturing parks and major events, the industrial sector typically employs a unified power quality regulator to resolve various power quality issues and achieve reactive power compensation. Industrial parks are often equipped with renewable energy power generation systems, such as photovoltaic systems, to supply power to the park. However, photovoltaic power generation systems and unified power quality regulators operate independently, failing to achieve the multi-energy complementary efficiency of the system.

[0003] According to available information, in 2021, Santanu et al. published a paper titled "A New PV-Open-UPQC Configuration for VoltageSensitive Loads Utilizing Novel Adaptive Controllers" in the top international journal IEEE Transactions on Industrial Informatics, proposing a photovoltaic-integrated unified power quality regulator. However, this method only considers photovoltaic integration and does not take into account the integration of low-ripple green hydrogen production with multi-energy complementarity, nor does it consider the system's fault-tolerant and reliable operation. Therefore, there is an urgent need for a hydrogen-photovoltaic integrated unified power quality regulator and its control method to solve the problem of power quality regulation in multi-energy complementary power generation and green hydrogen production. Simultaneously, it should address the issues of low-ripple green hydrogen production and fault-tolerant operation to improve system reliability.

[0004] Chinese patent document CN100341222C discloses a "power quality regulator," comprising a primary-side voltage converter, a high-frequency transformer, and a secondary-side voltage converter. The primary-side voltage converter is either a primary-side AC / AC converter or a primary-side AC / DC converter and a primary-side DC / AC converter connected in sequence. The secondary-side voltage converter is either a secondary-side AC / AC converter or a secondary-side AC / DC converter and a secondary-side DC / AC converter connected in sequence. This technical solution cannot be integrated with a photovoltaic power generation system to achieve the system's multi-energy complementary efficiency. Summary of the Invention

[0005] This invention primarily addresses the problem that existing technical solutions cannot be integrated with photovoltaic power generation systems to maximize the multi-energy complementary efficiency of the system. It provides a hydrogen-photovoltaic integrated unified power quality regulator and control method. The unified power quality regulator is constructed through the cooperation of a unified power quality regulator, a photovoltaic + boost circuit, and an electrolyzer + hydrogen converter. The hydrogen converter includes a main DC-DC circuit, a ripple compensation circuit, and a bypass circuit. The bypass circuit is used as a DC blocking capacitor in the ripple compensation circuit. The addition of the bypass circuit enables the ripple compensation circuit to transmit power. It proposes output current ripple-priority fault-tolerant control methods and power ripple-priority fault-tolerant control methods, achieving multi-energy complementary power generation, green hydrogen production, and power quality regulation. Simultaneously, the hydrogen converter in the system features low ripple and high reliability with fault-tolerant operation.

[0006] The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions:

[0007] A hydrogen-photonic integrated unified power quality conditioner includes:

[0008] A unified power quality regulator is used to uniformly regulate power quality.

[0009] The photovoltaic boost circuit is used to realize photovoltaic conversion and is connected to the system's DC bus.

[0010] A hydrogen converter, used to produce green hydrogen, is connected in parallel with a photovoltaic boost circuit.

[0011] Preferably, the hydrogen energy converter includes a main DC-DC circuit, a ripple compensation circuit, and a bypass circuit. The positive terminal of the input port of the main DC-DC circuit is connected to the positive terminal of the input port of the ripple compensation circuit to form the positive terminal of the total input port, and the negative terminal of the input port of the main DC-DC circuit is connected to the negative terminal of the input port of the ripple compensation circuit to form the negative terminal of the total input port. The positive terminal of the output port of the ripple compensation circuit is connected to the positive terminal of the input port of the bypass circuit, and the negative terminal of the output port of the ripple compensation circuit is connected to the negative terminal of the input port of the bypass circuit. The positive terminal of the output port of the bypass circuit is connected to the positive terminal of the output port of the main DC-DC circuit to form the positive terminal of the total output port, and the negative terminal of the output port of the bypass circuit is connected to the negative terminal of the output port of the main DC-DC circuit to form the negative terminal of the total output port.

[0012] Preferably, the main DC-DC circuit includes a first half-bridge circuit and a first filter inductor. The first half-bridge circuit includes a first semiconductor device S1 and a second semiconductor device S2. The first terminal of the first semiconductor device S1 forms the positive terminal of the input port of the main DC-DC circuit, and the second terminal is connected to the first terminal of the second semiconductor device S2 and the first terminal of the first filter inductor S1. The second terminal of the second semiconductor device S2 forms the negative terminal of the input port of the main DC / DC circuit and is also the negative terminal of the output port of the main DC-DC circuit. The second terminal of the filter inductor S1 forms the positive terminal of the output port of the main DC-DC circuit.

[0013] Preferably, the ripple compensation circuit includes a second half-bridge circuit and a second filter inductor L. AX and DC blocking capacitor C AX The second half-bridge circuit includes a third semiconductor device and S. AX1 Fourth semiconductor device S AX2 The third semiconductor device S AX1 The first terminal forms the positive terminal of the input port of the ripple compensation circuit, and the second terminal is respectively connected to the fourth semiconductor device S. AX2 The first terminal and the second filter inductor L AX The first end is connected, and the fourth semiconductor device S AX2 The second end forms the negative terminal of the input port of the ripple compensation circuit and is also the negative terminal of the output port of the ripple compensation circuit. The first end of the DC blocking capacitor is connected to the second filter inductor L. AX The second end is connected, and the second end constitutes the positive terminal of the output port of the ripple compensation circuit.

[0014] Preferably, the bypass circuit includes a first switching device RE1, a second switching device RE2, and an absorption resistor Rx, wherein one end of the first switching device RE1 is connected to the second filter inductor L. AX The second end is connected, and the other end is connected to the positive terminal of the output port of the main DC-DC circuit through the absorption resistor Rx. The second switching device RE2 is connected in parallel with the absorption resistor Rx.

[0015] A control method for a hydrogen-photonic integrated unified power quality regulator includes the following steps:

[0016] S1 generates switching signals for the main DC-DC circuit and the ripple compensation circuit through a control method;

[0017] S2 generates commands and switching signals according to the control requirements of specific applications;

[0018] S3 generates the switching signals for the main DC-DC circuit and the ripple compensation circuit through the output current ripple priority fault-tolerant control method.

[0019] S4 generates the switching signals for the main DC-DC circuit and the ripple compensation circuit through a power-priority fault-tolerant control method.

[0020] Preferably, step S1, which generates a switching signal according to a control method, specifically includes: for signals containing... N This is a composite interleaved parallel DC-DC converter circuit consisting of a main DC-DC circuit, a ripple compensation circuit, and a bypass circuit. In each control cycle, the switching signals for the main DC-DC circuit and the ripple compensation circuit are generated through a control method.

[0021] Preferably, in step S2, the control method of the main DC-DC circuit is determined according to the control requirements of the specific application scenario. The duty cycle command of each main DC-DC circuit is generated; carrier phase shift modulation is implemented to generate the switching signals of each main DC-DC circuit; and the corresponding ripple compensation circuit control method is adopted according to the actual application scenario to generate the switching signals of the ripple compensation branch.

[0022] Preferably, step S3 specifically includes, if N One of the main DC-DC circuits has n When a main DC-DC circuit fails and cannot continue transmitting power, firstly, the switching signals of the semiconductor devices in the faulty circuit are blocked and the faulty circuit is isolated; then, the remaining circuits are adjusted promptly. N - n The phase shift angle between the triangular carrier waves of the corresponding semiconductor devices in a normal main DC-DC circuit. In a compound interleaved parallel DC-DC converter circuit, during normal operation, the triangular carrier waves in the drive circuits of the semiconductor devices between the main DC-DC circuits are sequentially phase-shifted by 2π / N After the composite interleaved parallel DC-DC converter circuit enters the output current ripple-priority fault-tolerant control mode, it first... n Remove the switching signal from the faulty main DC-DC converter circuit, and then, the remaining components of the composite interleaved parallel DC-DC converter circuit... N - n The triangular carrier phase difference between semiconductor devices in a normal main DC-DC circuit is from 2π / N It becomes 2π / ( N - n This generates switching signals for the remaining normal main DC-DC circuit semiconductor devices under output current ripple priority fault-tolerant control; the ripple compensation circuit control method is adjusted according to the actual application to generate switching signals for the third and fourth semiconductor devices under output current ripple priority fault-tolerant control, so that the system enters the output current ripple priority fault-tolerant control mode.

[0023] Preferably, step S4 specifically includes, if N One of the main DC-DC circuits hasn When the main DC-DC circuit fails and cannot continue transmitting power, the switching signals of the semiconductor devices in the faulty circuit are first blocked and the faulty circuit is isolated. Simultaneously, the switching signals of the third and fourth semiconductor devices in the ripple compensation circuit are blocked. Then, the first switching device in the bypass circuit blocks the DC blocking capacitor of the bypass ripple compensation circuit, allowing the absorption resistor in the bypass circuit to completely absorb the energy stored in the DC blocking capacitor. Next, the second switching device in the bypass circuit is closed. Simultaneously, according to the control requirements of the specific application, a duty cycle command for the ripple compensation circuit is generated, and... N - n The duty cycle command generation method is the same for all normal main DC-DC circuits; then the carrier phase shift modulation is updated, and the ripple compensation circuit is generated. N - n The switching signals of the semiconductor devices corresponding to each normal main DC-DC circuit enable the system to enter the converter power ripple priority fault-tolerant control mode.

[0024] The beneficial effects of this invention are as follows: By coordinating a unified power quality regulator, a photovoltaic + boost circuit, and an electrolyzer + hydrogen converter, a hydrogen-photovoltaic integrated unified power quality regulator is constructed. The hydrogen converter includes a main DC-DC circuit, a ripple compensation circuit, and a bypass circuit. The bypass circuit is used as a DC blocking capacitor in the ripple compensation circuit. The addition of the bypass circuit enables the ripple compensation circuit to have power transmission capability. Output current ripple priority fault-tolerant control method and power ripple priority fault-tolerant control method are proposed. It has the functions of multi-energy complementary power generation, green hydrogen production, and power quality regulation. At the same time, the hydrogen converter in the system has the characteristics of low ripple and high reliability of fault-tolerant operation. Attached Figure Description

[0025] Figure 1 This is a circuit diagram of a power quality regulator system according to the present invention.

[0026] Figure 2 This is a circuit diagram of one embodiment of a hydrogen energy converter according to the present invention.

[0027] Figure 3 This is a flowchart illustrating an implementation method of the current ripple priority fault-tolerant control method of the present invention.

[0028] Figure 4 This is a flowchart illustrating an implementation method of the power-priority fault-tolerant control method of the present invention. Detailed Implementation

[0029] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0030] Example: This example describes a hydrogen-photonic integrated unified power quality regulator and control method, such as... Figure 1 As shown, this invention provides a hydrogen-photovoltaic integrated unified power quality conditioner system, comprising a unified power quality conditioner, a photovoltaic + boost circuit, and an electrolyzer + hydrogen converter. The photovoltaic + boost circuit and the electrolyzer + hydrogen converter are connected in parallel to the system's DC bus. The hydrogen converter includes... N One Buck circuit, one ripple compensation circuit, and one bypass circuit, such as Figure 2 As shown. N Each Buck circuit includes: N The semiconductor switching devices are S1, S2, ..., S... N ; N The diode devices are named D1, D2, ..., D... N ; N The inductors are respectively L 1, L 2, …… L N Each Buck circuit includes a semiconductor switch, a diode, and an inductor. N The Buck circuits are connected in an interleaved parallel configuration to form the main circuit of a composite interleaved parallel DC-DC converter. Each Buck circuit uses carrier phase-shift modulation, meaning that the phase difference between each carrier is 2π / N . N A semiconductor switching device S1, S2, ... S N and N Diode devices D1, D2, ... D N Both can use fully controllable semiconductor switching devices.

[0031] The ripple compensation circuit includes: two semiconductor switching devices, namely S... AX1 S AX2 One filter inductor is L AX One DC blocking capacitor is C AX Switching device S AX1 The first terminal is the positive terminal of the input port of the wave compensation circuit, and the second terminal is connected to the semiconductor switching device S. AX2 The first terminal and the filter inductor L AX The first terminal is connected, semiconductor switching device S AX2 The second terminal forms the negative terminal of the input port of the ripple compensation circuit and is also the negative terminal of the output port of the ripple compensation circuit. (DC blocking capacitor) C AX The first terminal and the filter inductor L AXThe second terminal is connected, and this second terminal forms the positive terminal of the output port of the ripple compensation circuit. The ripple compensation circuit uses a Buck / Boost bidirectional converter with bidirectional energy transfer, i.e., the switching device S. AX1 S AX2 It is a fully controllable semiconductor switching device, with a DC blocking capacitor connected in series at the output. C AX .

[0032] The bypass circuit includes: a first switching device RE1, a second switching device RE2, and an absorption resistor Rx. One end of the first switching device RE1 is connected to the second filter inductor L. AX The second end is connected, and the other end is connected to the positive terminal of the main DC-DC circuit output port through the absorption resistor Rx. The second switching device RE2 is connected in parallel with the absorption resistor Rx. The two relay switching devices RE1 and RE2 can also be a series of switching devices represented by controllable circuit breakers, relays, and fully controllable semiconductors.

[0033] The Figure 2 In the circuit shown, N The positive terminal of the input port of the main circuit, which is composed of several Buck circuits connected in an interleaved parallel manner, is connected to the positive terminal of the input port of the ripple compensation circuit to form the positive terminal of the total input port. Its negative terminal is connected to the negative terminal of the input port of the ripple compensation circuit to form the negative terminal of the total input port. N The positive terminal of the main circuit output port, which is composed of several Buck circuits connected in an interleaved parallel manner, is connected to the positive terminal of the ripple compensation circuit output port to form the positive terminal of the total output port. Its negative terminal is connected to the negative terminal of the ripple compensation circuit output port to form the negative terminal of the total output port.

[0034] V in and V o These are the input and output voltages of the composite interleaved parallel DC-DC converter circuit, respectively. i 1, i 2, …… i N yes N The output current of each Buck circuit in sequence; I dcmain It is the output current of the main circuit of the composite interleaved parallel DC-DC converter circuit; I AX It is the current of the ripple compensation circuit; I dco It is the output current of the composite interleaved parallel DC-DC converter circuit.

[0035] A control method for the normal operation of a composite interleaved parallel DC-DC converter circuit, characterized in that, for circuits containing... N This is a composite interleaved parallel DC-DC converter circuit consisting of a main circuit composed of three Buck circuits connected in an interleaved parallel configuration, a ripple compensation circuit, and a bypass circuit. In each control cycle, a control method is used to generate... N The switching signals of the Buck circuit and the ripple compensation circuit; for N The control method for each Buck circuit is generated based on the control requirements of the specific application. N The duty cycle instruction for each Buck circuit; implement carrier phase shift modulation, and generate... N Each Buck circuit provides its own switching signals; then, based on the actual application, a corresponding ripple compensation circuit control method is adopted to generate the switching device S of the ripple compensation branch. AX1 S AX2 The switching signal.

[0036] In another aspect, the present invention provides a fault-tolerant control method utilizing the aforementioned composite interleaved parallel DC-DC converter circuit, characterized in that, for circuits containing... N This is a composite interleaved parallel DC-DC converter circuit consisting of a main circuit composed of three Buck circuits connected in an interleaved parallel configuration, a ripple compensation circuit, and a bypass circuit. During output current ripple-priority fault-tolerant operation, the switching signals for the main circuit and the ripple compensation circuit are generated using an output current ripple-priority fault-tolerant control method. Its flowchart is shown below. Figure 3 As shown, the output current ripple-priority fault-tolerant control method includes the following steps: enabling the drive to start the composite interleaved parallel DC-DC converter circuit to ensure normal system operation, and... N The main circuit, composed of several Buck circuits connected in an interleaved parallel configuration, is used to measure electrical quantities in real time. When a fault is detected, if the number of faulty circuits... n Reaching the limit n max If the faulty circuit has several faults, then the machine will be shut down immediately; if the faulty circuit has several faults, then the n The limit was not reached. n max When this happens, first, the switching signals of the semiconductor devices in the faulty circuit are blocked and the faulty circuit is isolated; then, the remaining circuits are adjusted promptly. N - n The phase shift angle between the triangular carrier waves of the corresponding semiconductor devices in a normal Buck circuit. In a compound interleaved parallel DC-DC converter circuit, during normal operation, the triangular carrier waves in the drive circuits of the semiconductor devices between the Buck circuits are sequentially phase-shifted by 2π / N After the composite interleaved parallel DC-DC converter circuit enters the output current ripple-priority fault-tolerant control mode, it first... nRemove the switching signal from the faulty Buck circuit, and then remove the remaining components from the composite interleaved parallel DC-DC converter circuit. N - n The phase difference of the triangular carrier wave corresponding to the semiconductor devices in a normal Buck circuit is from 2π / N It becomes 2π / ( N - n This generates switching signals for the remaining normal Buck circuit semiconductor devices under output current ripple-priority fault-tolerant control; the ripple compensation circuit control method is adjusted according to the actual application to generate the switching devices S of the ripple compensation branch under output current ripple-priority fault-tolerant control. AX1 S AX2 The switching signal causes the system to enter the output current ripple priority fault-tolerant control mode.

[0037] In another aspect, the present invention provides a fault-tolerant control method utilizing the aforementioned composite interleaved parallel DC-DC converter circuit, characterized in that, for circuits containing... N This is a composite interleaved parallel DC-DC converter circuit consisting of a main circuit composed of three Buck circuits connected in an interleaved parallel configuration, a ripple compensation circuit, and a bypass circuit. During power-priority fault-tolerant operation, the switching signals for the main circuit and the ripple compensation circuit are generated using a power-priority fault-tolerant control method. Its flowchart is shown below. Figure 4 As shown, the power-priority fault-tolerant control method includes the following steps: enabling the drive to start the composite interleaved parallel DC-DC converter circuit to ensure normal system operation, and... N The main circuit, composed of several Buck circuits connected in an interleaved parallel configuration, is used to measure electrical quantities in real time. When a fault is detected, if the number of faulty circuits... n Reaching the limit n max If the faulty circuit has several faults, then the machine will be shut down immediately; if the faulty circuit has several faults, then the n The limit was not reached. n max When this occurs, firstly, the switching signals of the semiconductor devices in the faulty circuit are blocked and the faulty circuit is isolated. Simultaneously, the switching devices S of the ripple compensation circuit are blocked. AX1 S AX2 The switching signal is then received; subsequently, the relay switching device RE1 in the bypass circuit and the DC blocking capacitor of the bypass ripple compensation circuit are closed. C AX This causes the absorption resistor in the bypass circuit to... R x Complete absorption DC blocking capacitor C AX After storing the energy, the relay switch RE2 in the bypass circuit is closed. Simultaneously, based on the control requirements of the specific application, a duty cycle command for the ripple compensation circuit is generated, and... N- n The duty cycle command generation method is the same for a normal Buck circuit; then the carrier phase shift modulation is updated to generate the ripple compensation circuit switching device S. AX1 S AX2 and N - n The switching signals of each semiconductor device in a normal Buck circuit enable the system to enter the converter power-priority fault-tolerant control mode.

[0038] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0039] Although this document uses terms such as unified power quality regulator and hydrogen converter frequently, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A hydrogen light integrated unified power quality conditioner characterized by, The application relates to a power quality regulator, a photovoltaic boost circuit and a main DC-DC circuit. The positive terminal of the input port of the main DC-DC circuit is connected with the positive terminal of the input port of the ripple compensation circuit to form the positive terminal of the total input port, and the negative terminal of the input port of the main DC-DC circuit is connected with the negative terminal of the input port of the ripple compensation circuit to form the negative terminal of the total input port. The main DC-DC circuit comprises a first half-bridge circuit and a first filter inductor, the first half-bridge circuit comprises a first semiconductor device S1 and a second semiconductor device S2, the first end of the first semiconductor device S1 forms the positive terminal of the input port of the main DC-DC circuit, the second end is connected with the first end of the second semiconductor device S2 and the first end of the first filter inductor L1 respectively, the second end of the second semiconductor device S2 forms the negative terminal of the input port of the main DC / DC circuit and the negative terminal of the output port of the main DC-DC circuit, and the second end of the first filter inductor L1 forms the positive terminal of the output port of the main DC-DC circuit. Hydrogen energy converter, including composite staggered parallel DC converter composed of main DC-DC circuit, ripple compensation circuit and bypass circuit, for realizing green hydrogen production, hydrogen energy converter is connected in parallel with photovoltaic boost circuit, ripple compensation circuit includes second half bridge circuit, second filter inductor L AX And direct current isolation capacitor C AX , the second half bridge circuit includes third semiconductor device and S AX1 Fourth semiconductor device S AX2 , third semiconductor device S AX1 The first end constitutes the positive terminal of the input port of the ripple compensation circuit, the second end is connected with the first end of fourth semiconductor device S AX2 And the first end of the second filter inductor L AX , the second end of the fourth semiconductor device S AX2 Constitute the negative terminal of the input port of the ripple compensation circuit and the negative terminal of the output port of the ripple compensation circuit, the first end of the direct current isolation capacitor is connected with the second end of the second filter inductor L AX , the second end constitutes the positive terminal of the output port of the ripple compensation circuit, the bypass circuit is connected in parallel with the direct current isolation capacitor, including first switch device RE1, second switch device RE2 and absorption resistance Rx, one end of the first switch device RE1 is connected with the second end of the second filter inductor L AX , the other end is connected with the positive terminal of the output port of the main DC-DC circuit through the absorption resistance Rx, the second switch device RE2 is connected in parallel with the absorption resistance Rx.

2. The hydrogen light integrated unified power quality conditioner according to claim 1, characterized in that, The switching signals of the main DC-DC circuit and the ripple compensation circuit are generated through a control mode, specifically, the instructions and the switching signals are generated according to the control requirements of the specific application occasion; if n of the N main DC-DC circuits fail to continue to transmit power, the switching signals of the main DC-DC circuit and the ripple compensation circuit are generated through an output current ripple priority fault-tolerant control method or a power priority fault-tolerant control method.

3. The hydrogen light integrated unified power quality conditioner according to claim 2, wherein For the control mode of the main DC-DC circuit, the duty cycle instructions of the main DC-DC circuits are generated according to the control requirements of the specific application occasion; the carrier phase-shifted modulation is implemented to generate the switching signals of the main DC-DC circuits; and the switching signals of the ripple compensation branch are generated according to the corresponding ripple compensation circuit control method of the actual application occasion.

4. A control method of a hydrogen-optical integrated unified power quality conditioner, applied to the hydrogen-optical integrated unified power quality conditioner of any one of claims 1-3, characterized in that, The switching signals of the third semiconductor device and the fourth semiconductor device under the output current ripple priority fault-tolerant control are generated according to the ripple compensation circuit control method of the actual application occasion, so that the system enters the output current ripple priority fault-tolerant control mode.

5. The control method of a hydrogen light integrated unified power quality conditioner according to claim 4, wherein Generating switching signals through control methods specifically includes: for signals containing... N This is a composite interleaved parallel DC-DC converter circuit consisting of a main DC-DC circuit, a ripple compensation circuit, and a bypass circuit. In each control cycle, the switching signals for the main DC-DC circuit and the ripple compensation circuit are generated through a control method.

6. The control method of a hydrogen light integrated unified power quality conditioner according to claim 4, wherein ​ 7. The control method of a hydrogen light integrated unified power quality conditioner according to claim 4, wherein If N One of the main DC-DC circuit fails to continue transmission of power, first lock the switch signal of the semiconductor device of the failure path and isolate the failure path; timely adjust the phase shift angle between the triangular carrier of the corresponding semiconductor device of the remaining n - N n The triangular carrier in the drive circuit of the semiconductor device between the main DC-DC circuits of the composite interleaved parallel DC conversion circuit is sequentially phase shifted 2π / N When the composite interleaved parallel DC conversion circuit enters the output current ripple priority fault control mode, first remove the switch signal of the main DC-DC failure circuit, and then generate the switch signal of the semiconductor device of the remaining n - N n The phase difference between the triangular carrier corresponding to the semiconductor device between the remaining N N - n Normal main DC-DC circuits under the output current ripple priority fault control mode;​​​ ​ 8. The control method of a hydrogen light integrated unified power quality conditioner according to claim 4, wherein like N One of the main DC-DC circuits has n When a main DC-DC circuit fails and cannot continue to transmit power, the switching signals of the semiconductor devices in the faulty circuit are first blocked and the faulty circuit is isolated. At the same time, the switching signals of the third and fourth semiconductor devices in the ripple compensation circuit are blocked. Then, the first switch device in the bypass circuit is closed to bypass the DC blocking capacitor of the ripple compensation circuit, so that the absorption resistor in the bypass circuit completely absorbs the energy stored in the DC blocking capacitor, and then the second switch device in the bypass circuit is closed, and according to the control requirements of specific application occasions, the duty cycle instruction of the ripple compensation circuit is generated, and the generation manner of the duty cycle instruction of the normal main DC-DC circuit is the same. N - n ​ The carrier phase modulation is updated again, the ripple compensation circuit and N - n The switch signals of the semiconductor devices corresponding to the normal master DC-DC circuits respectively, so that the system enters a transformer power ripple priority fault-tolerant control mode.

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