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Quasi-single-stage transformerless grid-connected inverter and its control circuit

A transformer, quasi-single-stage technology, applied in the field of quasi-single-stage transformerless grid-connected inverter and its control circuit, can solve the problems of high on-state loss and urgent improvement of system efficiency, and achieve reduced power loss and low leakage current , the effect of broad application prospects

Active Publication Date: 2019-05-03
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above two schemes require all the output power of photovoltaic modules to undergo three-stage conversion, resulting in high on-state losses, and the system efficiency needs to be improved urgently.

Method used

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  • Quasi-single-stage transformerless grid-connected inverter and its control circuit
  • Quasi-single-stage transformerless grid-connected inverter and its control circuit
  • Quasi-single-stage transformerless grid-connected inverter and its control circuit

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Embodiment Construction

[0027] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] A quasi-single-stage transformerless grid-connected inverter includes a DC power conversion circuit and a full-bridge inverter circuit. The invention proposes two specific connection structures of the components of the full-bridge inverter circuit.

[0029] Such as figure 1 As shown in the first topology of the present invention, the full-bridge inverter circuit 2 includes a first power switch tube S 1 , the second power switch tube S 2 , the third power switch tube S 3 , the fourth power switch tube S 4 , the fifth power switch tube S 5 , the sixth power switch tube S 6 , power diode D, first DC capacitor C dc1 , the second DC capacitor C dc2 , the first filter inductor L f1 , the second filter inductance L f2 and AC filter capacitor C f .

[0030] The first DC capacitor C dc1 The positive pole of the photovoltaic power...

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Abstract

The invention discloses a quasi-single-stage transformerless grid-connected inverter and a control circuit thereof. The grid-connected inverter includes a DC power conversion circuit and a full-bridge inverter circuit, wherein the full-bridge inverter circuit includes first to sixth power switch tubes, power diodes, first and second DC capacitors, first, second The second filter inductor and the AC filter capacitor have two connection modes, corresponding to two full-bridge inverter topologies, and respectively have two control circuits. The invention reduces the conversion times of the output power of the photovoltaic module, reduces the on-state loss, and improves the system efficiency.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters, and in particular relates to a quasi-single-stage transformerless grid-connected inverter and a control circuit thereof. Background technique [0002] According to whether the photovoltaic power generation system is connected to the public grid, it can be divided into two modes: grid-connected operation and independent operation. Among them, grid-connected operation is the most common way for new energy power generation applications, and grid-connected inverters are key components in new energy grid-connected systems, and it is of great significance to improve their conversion efficiency and power density. [0003] Compared with grid-connected inverters including power frequency transformers, transformerless grid-connected inverters have the advantages of high conversion efficiency, small size and light weight, so they have been widely used. In the traditional two-stage photo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02M7/5387
CPCH02J3/383H02M7/53871Y02E10/56
Inventor 张犁高冉冉陈磊曲力涛许多
Owner HOHAI UNIV
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