Five-level inverter and method for controlling leakage current thereof

An inverter, five-level technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as low efficiency, reduce peaks, and reduce amplitude Effect

Active Publication Date: 2013-06-26
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0003] However, since the transformerless inverter cannot realize the electrical isolation between the DC input source and the AC load, there is a leakage current. The solutions for suppressing the leakage current in the prior art are roughly divided into two categories. The first category is that the filter inductor has a symmetrical structure , to ensure that the common-mode voltage is constant, which is a low-leakage current solution and adopts unipolar modulation. In terms of efficiency, the output bridge arm voltage is three-level, and the efficiency is low; the second type is that the AC side and the DC side are directly connected. , using a single inductor mode, this type of scheme needs to construct a DC voltage, and its maximum efficiency is only 98.6%

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  • Five-level inverter and method for controlling leakage current thereof
  • Five-level inverter and method for controlling leakage current thereof
  • Five-level inverter and method for controlling leakage current thereof

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Embodiment Construction

[0067] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0068] See figure 1 , which shows a schematic diagram of a circuit principle of a five-level inverter according to an embodiment of the present application. The five-level inverter includes: a power supply 100, a capacitor C1, a capacitor C2, an inductor L1, an inductor L2, a switch tube T1, The switching tube T2, the first node A, the s...

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Abstract

The invention discloses a five-level inverter and a method for controlling leakage current thereof. The five-level inverter is characterized in that a first switch tube and a second switch tube which are serially connected with each other are connected to two ends of a power source in parallel and are used as additional bridge arms. A conducting state of the first switch tube and a conducting state of the second switch tube are controlled, voltage between a first node of the five-level inverter and a negative end of the power source is in smooth transition at a zero-crossing point by the aid of a certain control strategy, peak is reduced, and accordingly the magnitude of the leakage current is reduced.

Description

technical field [0001] The present application relates to the technical field of inverters, in particular to a five-level inverter and a leakage current control method thereof. Background technique [0002] According to the different application occasions and control methods of the inverter, it can be divided into off-grid inverter and grid-connected inverter. In the grid-connected inverter, it can be divided into transformer-isolated inverter according to whether it has a transformer or not. transformers and transformerless inverters. Due to the advantages of simple system structure, high efficiency, small size, and low cost, transformerless inverters have been rapidly developed and widely used in photovoltaic power generation systems. [0003] However, since the transformerless inverter cannot realize the electrical isolation between the DC input source and the AC load, there is a leakage current. The solutions for suppressing the leakage current in the prior art are roug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
Inventor 汪洪亮宋炀李晓迅代尚方胡兵薛丽英周灵兵
Owner SUNGROW POWER SUPPLY CO LTD
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