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

A transformer and quasi-single-stage technology, applied in the field of quasi-single-stage transformerless grid-connected inverters and their control circuits, can solve the problems of high on-state loss and urgent improvement of system efficiency, and achieve reduced power loss and low leakage current , reduce the effect of the transformation level

Active Publication Date: 2017-02-22
HOHAI UNIV
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  • 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-

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

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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 comprises a DC power conversion circuit and a full-bridge inverter circuit, wherein the full-bridge inverter circuit comprises a first power switch tube, a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube, a sixth power switch tube, a power diode, a first DC capacitor, a second DC capacitor, a first filter inductor, a second filter inductor and an AC filter capacitor; and the full-bridge inverter circuit has two connection modes; and two control circuits correspond to two full-bridge inverter topologies respectively. According to the quasi single-stage transformerless grid-connected inverter and the control circuit thereof, the conversion frequency of output power of a photovoltaic assembly is reduced, the on-state loss is reduced and the system efficiency is improved.

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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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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