Five-level current transformation topological structure with bi-directional power switch and applications thereof

A power switch and topological structure technology, applied in the field of power conversion, can solve the problems of increased manufacturing difficulty, increased cost, and increased volume of phase-shifting isolation transformers, achieving the effect of reducing the number

Inactive Publication Date: 2012-09-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the size of the phase-shifting isolation transformer increases, the manufacturing difficulty increases, and the cost increases.

Method used

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  • Five-level current transformation topological structure with bi-directional power switch and applications thereof
  • Five-level current transformation topological structure with bi-directional power switch and applications thereof
  • Five-level current transformation topological structure with bi-directional power switch and applications thereof

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Embodiment Construction

[0024] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like image 3 As shown, a five-level converter topology with bidirectional power switch includes a capacitor link and a converter unit;

[0026] The capacitive chain consists of four capacitors C 1 ~C 4 composition; among them, the capacitance C 1 One end is connected to the positive pole of the external DC voltage source, the capacitor C 1 The other end of the capacitor C 2 connected to one end of the capacitor C 2 The other end of the capacitor C 3 connected to one end of the capacitor C 3The other end of the capacitor C 4 connected to one end of the capacitor C 4 The other end is connected to the negative pole of the external DC voltage source;

[0027] The converter unit consists of two bidirectional power switches Q 1 ~Q 2 , two diod...

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PUM

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Abstract

The invention discloses a five-level current transformation topological structure with a bi-directional power switch, comprising a capacitance link and a current transformation unit, wherein the capacitance link consists of four capacitors connected in series; the current transformation unit consists of two bi-directional power switches, two diodes and four switch tubes with anti-parallel diodes. The invention also discloses a three-phase five-level current transformer adopting the topological structure. According to the topological structure and the three-phase five-level current transformer, the bi-directional current flowing of the bi-directional power switch is controlled, and also the output of multiple levels of a circuit can be ensured as paths of the positive current and the negative current are controlled independently by utilizing the bi-directional power switch; on the basis of outputting five levels, the number of power devices and direct-voltage sources can be reduced greatly, the voltage stress of the bi-directional power switch is only one fourth of the bus voltage, the topological structure is symmetrical, and the modularized production is convenient.

Description

technical field [0001] The invention belongs to the technical field of power conversion, and in particular relates to a five-level converter topology structure with a bidirectional power switch and its application. Background technique [0002] In recent years, energy shortage and environmental pollution have become the focus of the world's attention. Under the policy of "energy saving and emission reduction" vigorously advocated by the state, power saving and energy reduction in medium, high voltage and high power occasions are even more urgent. Most of the existing medium and high-voltage high-power AC motors in my country are directly started, and the speed is adjusted by valve adjustment or hydraulic coupling. This speed control method causes a huge waste of electric energy. With the rapid development of my country's electric power industry, the industry The demand for high-voltage and high-power converters is increasing. When these high-power motors adopt variable freque...

Claims

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Application Information

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IPC IPC(8): H02M7/483
Inventor 李武华罗皓泽何湘宁
Owner ZHEJIANG UNIV
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