A new non-isolated five-level inverter

A five-level, non-isolated technology used in the control field to solve leakage current

Active Publication Date: 2019-01-08
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this topology, the switching devices S1-S4 bear most of the switching losses, and also share the conduction losses in the active state

Method used

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  • A new non-isolated five-level inverter
  • A new non-isolated five-level inverter
  • A new non-isolated five-level inverter

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Embodiment Construction

[0063] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0064] It should be noted that, in this embodiment, the first bridge arm circuit, the second bridge arm circuit, the first freewheeling circuit, the second freewheeling circuit and the connecting circuit all include at least one switching device. The switch device may be a transistor or a field effect transistor, or other circuits with a switch function. It should also be noted that in order to ensure the normal operation of each switching device, a freewheeli...

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Abstract

The invention provides a novel non-isolated five-level inverter. The non-isolated five-level inverter includes: a first end of the first bridge arm circuit is connected with the positive electrode ofthe battery; a second end of the first bridge arm circuit is connected with the negative electrode of the battery; The first end of the second bridge arm circuit is connected with the positive electrode of the battery, and the second end of the second bridge arm circuit is connected with the negative electrode of the battery. The first freewheeling circuit is respectively connected with the firstbridge arm circuit and the connecting circuit, and the second freewheeling circuit is respectively connected with the second bridge arm circuit and the connecting circuit. After the first bridge arm circuit, the second bridge arm circuit, the first freewheeling circuit, the second freewheeling circuit and some switching devices in the connection circuit are turned on in each operation state, the current path formed can keep the common-mode voltage of the non-isolated five-level inverter constant. This embodiment solves the voltage balance problem of the clamping capacitor, thereby ensuring that the common-mode voltage of the non-isolated five-level inverter is constant.

Description

technical field [0001] The invention relates to the technical field of control, in particular to a novel non-isolated five-level inverter. Background technique [0002] At present, in photovoltaic grid-connected systems, photovoltaic inverters play an important role in the process of electric energy conversion. As an important interface between photovoltaic cells and the grid, photovoltaic grid-connected inverters can be divided into isolated inverters and non-isolated inverters according to whether the inverter system contains an isolation transformer. In an isolated inverter system, a high-frequency transformer is usually installed on the DC side or a low-frequency transformer is installed on the low-frequency side. The transformer not only boosts the DC voltage of the photovoltaic cell, but also isolates the DC side and the AC side, so that there is no DC loop between the two. However, the existence of the transformer increases the loss of the entire system and greatly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02J3/38
CPCH02J3/383H02M7/483Y02E10/56
Inventor 汪洪亮朱晓楠罗安魏新伟陈鑫跃
Owner HUNAN UNIV
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