CN112865579B - Inverter circuit for inhibiting common mode leakage current and inverter - Google Patents

Inverter circuit for inhibiting common mode leakage current and inverter Download PDF

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Publication number
CN112865579B
CN112865579B CN202011634727.7A CN202011634727A CN112865579B CN 112865579 B CN112865579 B CN 112865579B CN 202011634727 A CN202011634727 A CN 202011634727A CN 112865579 B CN112865579 B CN 112865579B
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current
circuit
inverter
inverter circuit
transistors
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CN112865579A (en
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谢胜仁
李娟�
方刚
卢进军
黄敏
曾维波
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Goodwe Technologies Co Ltd
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Goodwe Technologies Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output

Abstract

The invention provides an inverter circuit for inhibiting common mode leakage current, which is used for receiving direct current output by a primary electric energy side, converting the direct current into alternating current and then transmitting the alternating current to a power grid, and comprises the following components: the invention also provides an inverter comprising the inverter circuit for inhibiting the common mode leakage current, and the inverter comprises a small number of introduced devices and devices, simple and reliable detection logic and high engineering applicability.

Description

Inverter circuit for inhibiting common mode leakage current and inverter
Technical Field
The invention relates to the field of inverter circuits, in particular to an inverter circuit for inhibiting common mode leakage current.
Background
The inverter circuit is a circuit for converting direct current into alternating current, and the full-bridge inverter circuit is one of the inverter circuits, and is widely applied to the fields of switching power supplies, motor speed regulation, traction transmission and the like due to high power output.
The single-phase full-bridge inverter circuit adopting the bipolar modulation strategy has low conversion efficiency, and the single-phase full-bridge inverter circuit adopting the unipolar modulation strategy has high conversion efficiency, but can introduce serious common-mode leakage current, increase power grid harmonic waves and generate electromagnetic interference, so that the whole system has poor reliability and certain potential safety hazard.
In order to solve the problem of common mode leakage current of a single-phase full-bridge inverter circuit adopting a unipolar modulation strategy, a current-suppressing capacitor is usually connected in parallel on the single-phase full-bridge inverter circuit, but the quality of network access current of the single-phase full-bridge inverter circuit can be influenced by adopting the mode, parameters of a current loop need to be readjusted, when the capacitance value of the current-suppressing capacitor is adjusted, the quality of network access current of the single-phase full-bridge inverter circuit can also be influenced, the parameters of the current loop need to be readjusted, and after the current-suppressing capacitor is added, the network access current of the single-phase full-bridge inverter circuit is easy to distort, so that the system is unstable.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides an inverter circuit for inhibiting common mode leakage current, which has the advantages of high conversion efficiency, small common mode leakage current, good network access current quality, good system stability and no influence of current loop parameters by a current-inhibiting capacitor.
In order to achieve the above object, the present invention adopts a technical solution for receiving dc power output from a primary power side, converting the dc power into ac power, and transmitting the ac power to a power grid, including:
the full-bridge inverter circuit comprises four transistors S1, S2, S3 and S4, wherein the transistors S1 and S2 and the transistors S3 and S4 respectively form two half-bridges of the full-bridge inverter circuit, and the connection points of the transistors S1 and S2 and the transistors S3 and S4 in the two half-bridges form the output end of the full-bridge inverter circuit;
the current suppression circuit is connected with a current suppression capacitor in series and is connected with the full-bridge inverter circuit in parallel;
the control circuit is connected with the control port of the full-bridge inverter circuit and is used for controlling the switching of the transistors S1, S2, S3 and S4;
the inverter circuit for inhibiting the common mode leakage current further comprises a current feedback circuit, and the current feedback circuit feeds the current passing through the current inhibition circuit back to the control circuit.
Preferably, there are two current-suppressing circuits, one end of each of which is connected to the output terminal of the primary power side, and the other end of each of which is connected to the connection point of the transistors S1 and S2 and the connection point of the transistors S3 and S4.
Further preferably, the current feedback circuit feeds back a current passing through one of the current suppressing circuits to the control circuit.
Preferably, the inverter circuit for suppressing the common mode leakage current further includes a filter circuit, the filter circuit is connected in series between the output end of the full-bridge inverter circuit and the power grid, one end of the current suppression circuit is connected to the output end of the primary power side, and the other end of the current suppression circuit is connected to the connection point of the filter circuit and the power grid.
Preferably, the control circuit comprises a driving circuit and a regulator which are electrically connected, the driving circuit is used for controlling the switching of the transistors S1, S2, S3 and S4, and the regulator is used for receiving the current fed back by the current feedback circuit.
Preferably, the inverter circuit for suppressing the common mode leakage current further comprises a phase locked loop.
The invention also provides an inverter, which comprises any one of the inverter circuits for inhibiting the common mode leakage current.
Preferably, the inverter is used for photovoltaic grid-connected power generation, and comprises an H4 inverter.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the invention provides an inverter circuit for inhibiting common mode leakage current, which is used for receiving direct current output by a primary electric energy side, converting the direct current into alternating current and transmitting the alternating current to a power grid, and comprises: the invention also provides an inverter comprising the inverter circuit for inhibiting the common mode leakage current, and the inverter comprises a small number of introduced devices and devices, simple and reliable detection logic and high engineering applicability.
Drawings
Fig. 1 is a simulation model of a full-bridge inverter circuit adopting a unipolar control strategy in the prior art.
Fig. 2 is a common mode leakage current simulation result of fig. 1.
Fig. 3 is a schematic circuit diagram of an inverter circuit for suppressing common mode leakage current in the prior art.
FIG. 4 is a simulation model made according to FIG. 3.
Fig. 5 is a common mode leakage current simulation result of fig. 4.
Fig. 6 is a circuit schematic of a preferred embodiment of the present invention.
FIG. 7 is a simulation model made according to FIG. 6.
Fig. 8 is a common mode leakage current simulation result of fig. 7.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
As shown in fig. 6 to 8, the inverter circuit for suppressing common mode leakage current according to the present invention is configured to receive a dc power output by a photovoltaic array PV, convert the dc power into an ac power, and transmit the ac power to a power grid ug, and includes: the photovoltaic inverter comprises a full-bridge inverter circuit, a filter circuit, a current suppression circuit, a control circuit and a current feedback circuit, wherein the input end of the full-bridge inverter circuit is connected with the output end of a photovoltaic array PV, the output end of the full-bridge inverter circuit is connected with a power grid ug, the full-bridge inverter circuit comprises four transistors S1, S2, S3 and S4, the transistors S1 and S2 and the transistors S3 and S4 respectively form two half bridges of the full-bridge inverter circuit, and the connection points of the transistors S1 and S2 and the transistors S3 and S4 in the two half bridges form the output end of the full-bridge inverter circuit; the filter circuit is connected in series between the output end of the full-bridge inverter circuit and the power grid ug, and in the embodiment, the filter circuit is an LC filter circuit consisting of two filter inductors L/2 and a filter capacitor Cf; the current-suppressing circuit is connected with the full-bridge inverter circuit in parallel, specifically, one end of the current-suppressing circuit is connected with the output end of the photovoltaic array PV, the other end of the current-suppressing circuit is connected with the connection point of the filter circuit and the power grid ug, and the current-suppressing circuit is connected with current-suppressing capacitors in series, in the embodiment, the current-suppressing circuits are two, and the current-suppressing capacitors connected in series on the two current-suppressing circuits are respectively C1 and C2; the control circuit is connected with the control port of the full-bridge inverter circuit and is used for controlling the switching of the transistors S1, S2, S3 and S4; the current feedback circuit feeds back the current passing through the current suppression circuit to the control circuit, and in the embodiment, the current feedback circuit only feeds back the current passing through one current suppression circuit to the control circuit, the one current suppression circuit is a current suppression circuit connected with a current suppression capacitor C2 in series, and the current passing through the current suppression circuit is icc.
In this embodiment, the control circuit includes a driver circuit (PWM) for controlling the switching of the transistors S1, S2, S3, S4, and a regulator for regulating the net-in current.
The inverter circuit for suppressing the common mode leakage current further comprises a Phase Locked Loop (PLL) and a detection circuit for detecting the current iL passing through the filter circuit and the current icc of the current suppression capacitor, and the detection circuit feeds the current iL and the current icc back to a regulator of the control circuit.
According to the inverter circuit for inhibiting the common mode leakage current, the common mode leakage current of the full-bridge inverter circuit is reduced through the current-inhibiting capacitor connected in series on the current-inhibiting circuit, the current passing through the current-inhibiting circuit is detected through the current feedback circuit and fed back to the control circuit, the network access current of the full-bridge inverter circuit is more stable, distortion does not occur, and the technical effects that the inverter circuit for inhibiting the common mode leakage current is high in conversion efficiency, small in common mode leakage current, good in network access current quality, good in system stability and free of current loop parameters from being influenced by the current-inhibiting capacitor are achieved.
In this embodiment, the transistors S1, S2, S3, and S4 are not limited, and in another embodiment, the transistors S1, S2, S3, and S4 are all limited to silicon metal oxide semiconductor field effect transistors (Si MOSFETs).
The invention also provides an inverter which comprises the inverter circuit for inhibiting the common mode leakage current, the inverter is used for photovoltaic grid-connected power generation and is an H4 inverter, compared with the existing inverter, the inverter has the advantages of few introduced devices and devices, high efficiency, small leakage current, no distortion phenomenon of network access current, good stability, simple detection logic, reliable method and high engineering applicability, and greatly saves the development cost of a system.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (6)

1. An inverter circuit for suppressing common mode leakage current is used for receiving direct current output by a primary electric energy side, converting the direct current into alternating current and then transmitting the alternating current to a power grid, and comprises:
the full-bridge inverter circuit comprises four transistors S1, S2, S3 and S4, wherein the transistors S1 and S2 and the transistors S3 and S4 respectively form two half-bridges of the full-bridge inverter circuit, and the connection points of the transistors S1 and S2 and the transistors S3 and S4 in the two half-bridges form the output end of the full-bridge inverter circuit;
the current suppression circuits are connected with current suppression capacitors in series, the number of the current suppression circuits is two, one end of each current suppression circuit is connected with the output end of the primary power side, and the other end of each current suppression circuit is connected with the connection point of the transistors S1 and S2 and the connection point of the transistors S3 and S4 respectively;
the control circuit is connected with the control port of the full-bridge inverter circuit and is used for controlling the switching of the transistors S1, S2, S3 and S4;
the method is characterized in that:
the inverter circuit for inhibiting the common-mode leakage current further comprises a current feedback circuit and a phase-locked loop, wherein the current feedback circuit passes through the current icc and the filter circuit current iL of the current inhibition circuit and the current IL of the phase-locked loop and feeds back the current IL to the control circuit after addition and subtraction operation, so that the network access current of the full-bridge inverter circuit is more stable.
2. The inverter circuit for suppressing a common mode leakage current according to claim 1, wherein:
the current feedback circuit feeds back the current passing through one of the current-suppressing circuits to the control circuit.
3. The inverter circuit for suppressing a common mode leakage current according to claim 1, wherein:
the inverter circuit for suppressing the common-mode leakage current further comprises a filter circuit, the filter circuit is connected in series between the output end of the full-bridge inverter circuit and the power grid, one end of the current suppression circuit is connected with the output end of the primary electric energy side, and the other end of the current suppression circuit is connected with the connection point of the filter circuit and the power grid.
4. The inverter circuit for suppressing a common mode leakage current according to claim 1, wherein:
the control circuit comprises a driving circuit and a regulator which are electrically connected, the driving circuit is used for controlling the switches of the transistors S1, S2, S3 and S4, and the regulator is used for receiving the current fed back by the current feedback circuit.
5. An inverter is characterized in that a DC-DC converter is provided,
the inverter includes the inverter circuit suppressing the common mode leakage current according to any one of claims 1 to 4.
6. The inverter of claim 5,
the inverter is used for photovoltaic grid-connected power generation and comprises an H4 inverter.
CN202011634727.7A 2020-12-31 2020-12-31 Inverter circuit for inhibiting common mode leakage current and inverter Active CN112865579B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102857084A (en) * 2012-09-28 2013-01-02 北京京仪绿能电力系统工程有限公司 Circuit and method for restraining non-insulation type inverter common mode leakage current
CN208015613U (en) * 2018-02-02 2018-10-26 青岛云路聚能电气有限公司 A kind of gird-connected inverter
CN111293865A (en) * 2020-03-23 2020-06-16 阳光电源股份有限公司 Inverter topology circuit and single-phase inverter
CN111864695A (en) * 2020-03-18 2020-10-30 同济大学 Leakage current detection protection method and device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI437812B (en) * 2011-07-08 2014-05-11 Delta Electronics Inc Dc-ac conversion circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102857084A (en) * 2012-09-28 2013-01-02 北京京仪绿能电力系统工程有限公司 Circuit and method for restraining non-insulation type inverter common mode leakage current
CN208015613U (en) * 2018-02-02 2018-10-26 青岛云路聚能电气有限公司 A kind of gird-connected inverter
CN111864695A (en) * 2020-03-18 2020-10-30 同济大学 Leakage current detection protection method and device
CN111293865A (en) * 2020-03-23 2020-06-16 阳光电源股份有限公司 Inverter topology circuit and single-phase inverter

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