Converter circuit based on gas differential pressure power generation

Abstract

The utility model discloses a converter circuit based on gas differential pressure power generation, which comprises an IPM power unit, the input end of the IPM power unit is connected with the output end of a permanent magnet synchronous motor, the input end of the IPM power unit is also connected with a brake resistor, the brake resistor is also connected with the permanent magnet synchronous motor, and the brake resistor is connected with the permanent magnet synchronous motor. When equipment fails, the permanent magnet synchronous motor is braked, and overspeed of the permanent magnet synchronous motor can be effectively avoided; the output end of the IPM power unit is connected with the input end of the PCS power unit; the output end of the PCS power unit is connected with the input end of the filtering unit, and the output end of the filtering unit is connected with a power grid through the circuit breaker QF1.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of current conversion, specifically relates to a current conversion circuit based on gas pressure difference power generation. BACKGROUND

[0002] With the development of urbanization more and more fast, natural gas station or gas station in city usually uses roots booster pump or pipeline booster pump to carry out pressure boost to the gas in pipeline, and there is big pressure difference between each level pipeline in city and last level pipeline, current has the scheme of utilizing the pressure difference to generate power, but the synchronous motor speed of prior art scheme is easy to overspeed, and in the case that the power generation device fails or the network side power-off brake is not timely, the over speed of the expander or permanent magnet synchronous motor can be caused to damage the equipment and endanger personal safety.

[0003] Therefore, how to avoid the overspeed of the permanent magnet synchronous motor, and realize the brake of the permanent magnet synchronous motor in the failure, is the technical problem to be solved by the person skilled in the art. UTILITY MODEL CONTENTS

[0004] The utility model discloses a current conversion circuit based on gas pressure difference power generation, which can solve the technical problems of the prior art, such as the overspeed of the permanent magnet synchronous motor when generating power by utilizing the gas pressure difference, and the brake of the permanent magnet synchronous motor in the failure.

[0005] The IPM power unit is connected with the output end of the permanent magnet synchronous motor, and the input end of the IPM power unit is also connected with a brake resistor, and the brake resistor is also connected with the permanent magnet synchronous motor.

[0006] The PCS power unit is connected with the output end of the IPM power unit.

[0007] The filter unit is connected with the output end of the PCS power unit, and the output end of the filter unit is connected with the power grid through a circuit breaker QF1.

[0008] Further, the IPM power unit specifically includes:

[0009] The IGBT1 to IGBT6 each have two IGBTs in a package, the emitter of the T1 tube of the IGBT1 is connected with the collector of the T4 tube of the IGBT1, and the emitter of the T1 tube of the IGBT1 and the collector of the T3 tube of the IGBT2 are both connected with a u-phase current output end of the permanent magnet synchronous motor, the emitter of the T1 tube of the IGBT3 is connected with the collector of the T4 tube of the IGBT3, and the emitter of the T1 tube of the IGBT3 and the collector of the T3 tube of the IGBT4 are both connected with a v-phase current output end of the permanent magnet synchronous motor, the emitter of the T1 tube of the IGBT5 and the collector of the T4 tube of the IGBT5 are connected, and the emitter of the T1 tube of the IGBT5 and the collector of the T3 tube of the IGBT6 are both connected with a w-phase current output end of the permanent magnet synchronous motor, the collector of the T1 tube of the IGBT1, the collector of the T1 tube of the IGBT3 and the collector of the T1 tube of the IGBT5 are collectively used as a first output end of the IPM power unit, the emitter of the T4 tube of the IGBT1, the emitter of the T4 tube of the IGBT3 and the emitter of the T4 tube of the IGBT5 are collectively used as a third output end of the IPM power unit, the emitter of the T3 tube of the IGBT2 is connected with the emitter of the T2 tube of the IGBT2, the emitter of the T4 tube of the IGBT4 is connected with the emitter of the T2 tube of the IGBT4, the emitter of the T3 tube of the IGBT6 is connected with the emitter of the T2 tube of the IGBT6, the collector of the T2 tube of the IGBT2, the collector of the T2 tube of the IGBT4 and the collector of the T2 tube of the IGBT6 are collectively used as a second output end of the IPM power unit, the first output end of the IPM power unit and the second output end of the IPM power unit are connected in series with a capacitor C1, and the second output end of the IPM power unit and the third output end of the IPM power unit are connected in series with a capacitor C2.

[0010] Further, the braking resistor is specifically connected with the input end of the IPM power unit through the alternating current contactor KM2.

[0011] Further, the input end of the IPM power unit is further provided with a current sensor.

[0012] Further, the PCS power unit specifically comprises:

[0013] The collector of the T1 tube of IGBT7, the collector of the T1 tube of IGBT9 and the collector of the T1 tube of IGBT11 are collectively used as a first input end of a PCS power unit, the collector of the T2 tube of IGBT8, the collector of the T2 tube of IGBT10 and the collector of the T2 tube of IGBT12 are collectively used as a second input end of the PCS power unit, the emitter of the T4 tube of IGBT7, the emitter of the T4 tube of IGBT9 and the emitter of the T4 tube of IGBT11 are collectively used as a third input end of the PCS power unit, a capacitor C3 is connected in series between the first input end and the second input end of the PCS power unit, a capacitor C4 is connected in series between the second input end and the third input end of the PCS power unit, the emitter of the T1 tube of IGBT7, the collector of the T3 tube of IGBT8 and the collector of the T4 tube of IGBT7 are collectively used as a first output end of the PCS power unit, the emitter of the T1 tube of IGBT9, the collector of the T3 tube of IGBT10 and the collector of the T4 tube of IGBT9 are collectively used as a second output end of the PCS power unit, and the emitter of the T1 tube of IGBT11, the collector of the T3 tube of IGBT12 and the collector of the T4 tube of IGBT11 are collectively used as a third output end of the PCS power unit.

[0014] Further, the filter unit specifically comprises:

[0015] The U2 end of the inductor L2 is used as a first input end of the filter unit, the V2 end of the inductor L2 is used as a second input end of the filter unit, the W2 end of the inductor L2 is used as a third input end of the filter unit, the U1 end of the inductor L2 is connected with the U2 end of the inductor L1 and the X2 end of the resistor R5 respectively, the V1 end of the inductor L2 is connected with the V2 end of the inductor L1 and the X2 end of the resistor R4 respectively, the W1 end of the inductor L2 is connected with the W2 end of the inductor L1 and the X2 end of the resistor R3 respectively, the X1 end of the resistor R5 is connected with the X1 end of the capacitor C1, the X1 end of the resistor R4 is connected with the X2 end of the capacitor C1, the X1 end of the resistor R3 is connected with the X3 end of the capacitor C1, the U1 end of the inductor L1 is used as a first output end of the filter unit and outputs a u-phase current, the V1 end of the inductor L1 is used as a second output end of the filter unit and outputs a v-phase current, and the W1 end of the inductor L1 is used as a third output end of the filter unit and outputs a w-phase current.

[0016] Further, the circuit breaker QF1 is connected with the power grid through a transformer and a disconnector in sequence.

[0017] Compared with the prior art, the utility model has the advantages of:

[0018] The utility model provides a kind of based on gas pressure difference power generation's current conversion circuit, compared with prior art, the circuit includes IPM power unit, the input of the IPM power unit is connected with the output of permanent magnet synchronous motor, wherein, the input of the IPM power unit is also connected with brake resistance, the brake resistance is also connected with the permanent magnet synchronous motor;The output of the IPM power unit is connected with the input of PCS power unit;The output of PCS power unit is connected with the input of filter unit, the output of filter unit is connected with power grid through circuit breaker QF1, can effectively avoid permanent magnet synchronous motor overspeed, simultaneously realize the brake of permanent magnet synchronous motor when fault. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the present specification, the drawings needed to be used in the embodiments will be briefly introduced as follows, and the drawings in the following description are only some embodiments described in the present specification, and for ordinary skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0020] Figure 1 As shown in the whole structure schematic view of current conversion circuit based on gas pressure difference power generation provided by the present specification is provided;

[0021] Figure 2 As shown in the structure schematic view of IPM power unit provided by the present specification is provided;

[0022] Figure 3 As shown in the structure schematic view of PCS power unit provided by the present specification is provided;

[0023] Figure 4 As shown in the structure schematic view of filter unit provided by the present specification is provided. DETAILED DESCRIPTION

[0024] In order to make the person in the technical field better understand the technical scheme in the present specification, the technical scheme in the present specification will be described clearly and completely by combining the drawings in the embodiments of the present specification as follows, obviously, the described embodiments are only part of the embodiments of the present specification, not all the embodiments. Based on the embodiments in the present specification, all other embodiments obtained by ordinary skilled in the art without creative labor should belong to the scope of the present specification.

[0025] As Figure 1The diagram shown illustrates the overall structure of the converter circuit for gas pressure differential power generation provided in this embodiment. While this specification provides the structures shown in the embodiments or figures below, based on conventional methods or without creative effort, the structures may include more or fewer components combined. These structures are not limited to those shown in the embodiments or figures of this specification. In practical applications of devices or terminal products, the structures described can be executed sequentially or in parallel according to the embodiments or module structures.

[0026] The converter circuit for gas pressure difference power generation provided in the embodiments of this specification includes:

[0027] IPM power unit, that is Figure 1 The IPM unit in the motor is connected to the output of the permanent magnet synchronous motor. The input of the IPM power unit is also connected to a braking resistor, which is connected to the permanent magnet synchronous motor through a contactor KM2.

[0028] PCS power unit, that is Figure 1 The PCS unit in the power unit is connected to the output of the IPM power unit.

[0029] A filtering unit is provided, the input of which is connected to the output of the PCS power unit, and the output of which is connected to the power grid via a circuit breaker QF1.

[0030] Specifically, the input terminal of the IPM power unit is connected to the permanent magnet synchronous motor (PMSM). IPM stands for Intelligent Power Module, and PCS stands for Power Conversion System. PCS receives the three-phase AC power output from the PMSM and can output DC power to the PCS power unit in real time according to the speed of the PMSM. This allows for the feedback of more energy to the grid when the PMSM is about to overspeed, consuming the energy promptly and preventing overspeed. Furthermore, when the converter malfunctions, a braking resistor is used to brake the PMSM, ensuring the safety of the equipment. Specifically, the braking resistor is connected to the input terminal of the IPM power unit via AC contactor KM2. When the converter malfunctions and cannot operate normally, the main controller will control AC contactor KM2 to engage, activating the braking resistor to brake the PMSM. QF1 will then disconnect from the grid side, and the valves in the manifold will begin to close, ensuring that the PMSM and the expander driving the PMSM do not run away.

[0031] Wherein, the circuit breaker QF1 is connected with the power grid through the transformer and the disconnector in turn, after the power supply on the line such as 400V, the disconnector and the circuit breaker at the transformer are closed, the transformer has electricity, the function of the transformer is to change the alternating current into 220V, to provide 220V voltage for the under-voltage release of the circuit breaker QF1, to ensure that QF1 will not be under-voltage released after being closed, at the same time, when the power supply of the grid is off, the control circuit breaker QF1 is also disconnected, to prevent the PCS power unit from continuing to output inverter after the power supply of the grid is off, causing personal safety accidents or property losses; the circuit breaker QF2 is also arranged between the circuit breaker QF1 and the transformer, when the circuit breaker QF2 is closed, the main control unit detects that the voltage in front of the circuit breaker QF1 is normal, and controls the AC contactor KM1 to be automatically attracted.

[0032] In the embodiment of the present application, as shown in Figure 2 The IPM power unit specifically comprises:

[0033] IGBT1 to IGBT6 each package has 2 IGBTs, the emitter of the T1 tube of IGBT1 is connected with the collector of the T4 tube of IGBT1, and the emitter of the T1 tube of IGBT1 and the collector of the T3 tube of IGBT2 are connected with the u-phase current output end of the permanent magnet synchronous motor, the emitter of the T1 tube of IGBT3 is connected with the collector of the T4 tube of IGBT3, and the emitter of the T1 tube of IGBT3 and the collector of the T3 tube of IGBT4 are connected with the v-phase current output end of the permanent magnet synchronous motor, the emitter of the T1 tube of IGBT5 and the collector of the T4 tube of IGBT5 are connected, and the emitter of the T1 tube of IGBT5 and the collector of the T3 tube of IGBT6 are connected with the w-phase current output end of the permanent magnet synchronous motor, the collector of the T1 tube of IGBT1, the collector of the T1 tube of IGBT3 and the collector of the T1 tube of IGBT5 are collectively used as the first output end of the IPM power unit, the emitter of the T4 tube of IGBT1, the emitter of the T4 tube of IGBT3 and the emitter of the T4 tube of IGBT5 are collectively used as the third output end of the IPM power unit, the emitter of the T3 tube of IGBT2 is connected with the emitter of the T2 tube of IGBT2, the emitter of the T4 tube of IGBT4 is connected with the emitter of the T2 tube of IGBT4, the emitter of the T3 tube of IGBT6 is connected with the emitter of the T2 tube of IGBT6, the collector of the T2 tube of IGBT2, the collector of the T2 tube of IGBT4 and the collector of the T2 tube of IGBT6 are collectively used as the second output end of the IPM power unit, the first output end of the IPM power unit and the second output end of the IPM power unit are connected in series with the capacitor C1, and the second output end of the IPM power unit and the third output end of the IPM power unit are connected in series with the capacitor C2.

[0034] Specifically, the input end of the IPM power unit is also provided with current sensors, which include current sensors TA03 and TA04. The permanent magnet synchronous motor generates alternating current under the drag of the expander. The alternating current is rectified into direct current after the IPM power unit. The current sensors TA03 and TA04 are respectively used to collect U / W phase currents, and are provided with a voltage sampling loop to collect line voltages between U / V / W, which are used to detect the speed, power generation and other information of the permanent magnet synchronous motor and the state of the motor. The alternating current is rectified by the IPM power unit to serve as a direct current power supply of the PCS power unit. The current sensor TA05 between the IPM power unit and the PCS power unit is used to detect direct current, and is provided with a direct current bus voltage detection loop to detect the half bus voltage between three levels PO, ON, which are used to control and prevent the midpoint balance half bus voltage from being pulled off.

[0035] In the embodiment of the present application, as shown in Figure 3 The PCS power unit specifically includes:

[0036] There are 2 IGBTs in each package of IGBT7 to IGBT12. The collector of the T1 tube of IGBT7, the collector of the T1 tube of IGBT9 and the collector of the T1 tube of IGBT11 jointly serve as the first input end of the PCS power unit. The collector of the T2 tube of IGBT8, the collector of the T2 tube of IGBT10 and the collector of the T2 tube of IGBT12 jointly serve as the second input end of the PCS power unit. The emitter of the T4 tube of IGBT7, the emitter of the T4 tube of IGBT9 and the emitter of the T4 tube of IGBT11 jointly serve as the third input end of the PCS power unit. The first input end of the PCS power unit and the second input end of the PCS power unit are connected in series with a capacitor C3. The second input end of the PCS power unit and the third input end of the PCS power unit are connected in series with a capacitor C4. The emitter of the T1 tube of IGBT7, the collector of the T3 tube of IGBT8 and the collector of the T4 tube of IGBT7 jointly serve as the first output end of the PCS power unit. The emitter of the T1 tube of IGBT9, the collector of the T3 tube of IGBT10 and the collector of the T4 tube of IGBT9 jointly serve as the second output end of the PCS power unit. The emitter of the T1 tube of IGBT11, the collector of the T3 tube of IGBT12 and the collector of the T4 tube of IGBT11 jointly serve as the third output end of the PCS power unit.

[0037] Specifically, the PCS power unit automatically follows the size and frequency of the grid side voltage, and the inverter output is the same as the grid side alternating current, which completes the grid connection; the current sensor TA01 at the first output end of the PCS power unit, the current sensor TA02 at the third output end of the PCS power unit are used to detect the output current of the PCS power unit, and are used to calculate the power generation amount fed back to the power grid; the first output end of the IPM power unit is connected with the first input end of the PCS power unit, the second output end of the IPM power unit is connected with the second input end of the PCS power unit, and the third output end of the IPM power unit is connected with the third input end of the PCS power unit.

[0038] As shown in Figure 4 The filter unit specifically comprises:

[0039] The U2 end of the inductor L2 is the first input end of the filter unit, the V2 end of the inductor L2 is the second input end of the filter unit, and the W2 end of the inductor L2 is the third input end of the filter unit; the U1 end of the inductor L2 is connected with the U2 end of the inductor L1 and the X2 end of the resistor R5 respectively, the V1 end of the inductor L2 is connected with the V2 end of the inductor L1 and the X2 end of the resistor R4 respectively, and the W1 end of the inductor L2 is connected with the W2 end of the inductor L1 and the X2 end of the resistor R3 respectively; the X1 end of the resistor R5 is connected with the X1 end of the capacitor C1, the X1 end of the resistor R4 is connected with the X2 end of the capacitor C1, and the X1 end of the resistor R3 is connected with the X3 end of the capacitor C1; the U1 end of the inductor L1 is the first output end of the filter unit and outputs the u-phase current, the V1 end of the inductor L1 is the second output end of the filter unit and outputs the v-phase current, and the W1 end of the inductor L1 is the third output end of the filter unit and outputs the w-phase current.

[0040] Specifically, the filter unit can filter the output current of the PCS power unit and make it meet the voltage and frequency requirements of grid connection.

[0041] It should be understood that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there can be an intermediate element; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intermediate element, in addition, "connected" used herein can include wireless connection; the phrase "and / or" used herein includes any one of the associated listed items and all combinations thereof.

[0042] It should be understood that the various parts of the present application can be implemented in hardware, software, firmware or a combination thereof. In the above embodiments, the various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any of the following technologies, known in the art, or their combinations can be used to implement the hardware: discrete logic circuitry having logic gates for implementing logic functions upon an application of data signals, application-specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field-programmable gate arrays (FPGA), and the like.

[0043] Those skilled in the art can understand that all or part of the steps carried out by the above-mentioned embodiment methods can be completed by programs instructing related hardware, and the programs can be stored in a computer readable storage medium, and when the programs are executed, one or a combination of the steps of the method embodiments is included.

[0044] In addition, each functional unit in each embodiment of the present application can be integrated into one processing module, or each unit can be physically present alone, or two or more units can be integrated into one module. The above-mentioned integrated module can be realized in the form of hardware or in the form of a software function module. When the integrated module is realized in the form of a software function module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0045] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0046] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

[0048] The above is further detailed description of the utility model in combination with specific preferred embodiments, and cannot be deemed as limitation of the specific implementation of the utility model to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, without departing from the concept of the utility model, a number of simple deductions or substitutions can be made, and all of them shall be deemed as belonging to the protection scope of the utility model.

Claims

1. A current conversion circuit for generating electricity based on a gas pressure difference, characterized by, The current conversion circuit comprises: An IPM power unit, an input end of the IPM power unit being connected with an output end of a permanent magnet synchronous motor, wherein the input end of the IPM power unit is further connected with a braking resistor, and the braking resistor is further connected with the permanent magnet synchronous motor through a contactor KM2; A PCS power unit, an input end of the PCS power unit being connected with an output end of the IPM power unit; A filter unit, an input end of the filter unit being connected with an output end of the PCS power unit, and an output end of the filter unit being connected with a power grid through a circuit breaker QF1.

2. The variable current circuit based on gas pressure difference for power generation as claimed in claim 1, wherein, The IPM power unit specifically comprises: The T1 emitter of the IGBT1 and the T3 collector of the IGBT2 are connected with a u-phase current output end of the permanent magnet synchronous motor, the T1 emitter of the IGBT3 and the T3 collector of the IGBT4 are connected with a v-phase current output end of the permanent magnet synchronous motor, the T1 emitter of the IGBT5 and the T3 collector of the IGBT6 are connected with a w-phase current output end of the permanent magnet synchronous motor, the T1 collector of the IGBT1, the T1 collector of the IGBT3 and the T1 collector of the IGBT5 are collectively used as a first output end of the IPM power unit, the T4 emitter of the IGBT1, the T4 emitter of the IGBT3 and the T4 emitter of the IGBT5 are collectively used as a third output end of the IPM power unit, the T3 emitter of the IGBT2 and the T2 emitter of the IGBT2 are connected, the T4 emitter of the IGBT4 and the T2 emitter of the IGBT4 are connected, the T3 emitter of the IGBT6 and the T2 emitter of the IGBT6 are connected, the T2 collector of the IGBT2, the T2 collector of the IGBT4 and the T2 collector of the IGBT6 are collectively used as a second output end of the IPM power unit, the first output end of the IPM power unit and the second output end of the IPM power unit are connected in series with a capacitor C1, and the second output end of the IPM power unit and the third output end of the IPM power unit are connected in series with a capacitor C2.

3. The variable current circuit based on gas pressure difference for power generation as claimed in claim 2, wherein, The braking resistor is specifically connected with the input end of the IPM power unit through the alternating current contactor KM2.

4. The variable current circuit based on gas pressure difference for power generation as claimed in claim 3, wherein, The input end of the IPM power unit is further provided with a current sensor.

5. The variable current circuit based on gas pressure difference for power generation as claimed in claim 1, wherein, The PCS power unit specifically comprises: The IGBT 7 to the IGBT 12 each have 2 IGBTs in a package, the collector of the T1 tube of the IGBT 7, the collector of the T1 tube of the IGBT 9 and the collector of the T1 tube of the IGBT 11 jointly serve as a first input end of a PCS power unit, the collector of the T2 tube of the IGBT 8, the collector of the T2 tube of the IGBT 10 and the collector of the T2 tube of the IGBT 12 jointly serve as a second input end of the PCS power unit, the emitter of the T4 tube of the IGBT 7, the emitter of the T4 tube of the IGBT 9 and the emitter of the T4 tube of the IGBT 11 jointly serve as a third input end of the PCS power unit, a capacitor C3 is connected in series between the first input end of the PCS power unit and the second input end of the PCS power unit, a capacitor C4 is connected in series between the second input end of the PCS power unit and the third input end of the PCS power unit, the emitter of the T1 tube of the IGBT 7, the collector of the T3 tube of the IGBT 8 and the collector of the T4 tube of the IGBT 7 jointly serve as a first output end of the PCS power unit, the emitter of the T1 tube of the IGBT 9, the collector of the T3 tube of the IGBT 10 and the collector of the T4 tube of the IGBT 9 jointly serve as a second output end of the PCS power unit, the emitter of the T1 tube of the IGBT 11, the collector of the T3 tube of the IGBT 12 and the collector of the T4 tube of the IGBT 11 jointly serve as a third output end of the PCS power unit.

6. The variable current circuit based on gas pressure difference for power generation as claimed in claim 1, wherein, The filter unit specifically comprises: The U2 end of the inductor L2 serves as a first input end of the filter unit, the V2 end of the inductor L2 serves as a second input end of the filter unit, the W2 end of the inductor L2 serves as a third input end of the filter unit, the U1 end of the inductor L2 is connected with the U2 end of the inductor L1 and the X2 end of the resistor R5 respectively, the V1 end of the inductor L2 is connected with the V2 end of the inductor L1 and the X2 end of the resistor R4 respectively, the W1 end of the inductor L2 is connected with the W2 end of the inductor L1 and the X2 end of the resistor R3 respectively, the X1 end of the resistor R5 is connected with the X1 end of the capacitor C1, the X1 end of the resistor R4 is connected with the X2 end of the capacitor C1, the X1 end of the resistor R3 is connected with the X3 end of the capacitor C1, the U1 end of the inductor L1 serves as a first output end of the filter unit and outputs a u-phase current, the V1 end of the inductor L1 serves as a second output end of the filter unit and outputs a v-phase current, the W1 end of the inductor L1 serves as a third output end of the filter unit and outputs a w-phase current.

7. The gas pressure differential based power generation current conversion circuit of claim 1, wherein, The circuit breaker QF1 is connected with the power grid through a transformer and a disconnector in sequence.

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