Pre-charge system and method for capacitor of modular multi-level matrix converter

A modular multi-level, matrix converter technology, applied to electrical components, output power conversion devices, etc., can solve problems such as unsuitable pre-charging methods, and achieve the effects of reduced power, simple control, and convenient implementation

Inactive Publication Date: 2013-03-20
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

And this MMC topology is an AC-DC-AC converter structure, and MMC 3 C AC-AC converters have essential differences, so the existing MMC capacitor precharging method is not suitable for M 3 C system

Method used

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  • Pre-charge system and method for capacitor of modular multi-level matrix converter
  • Pre-charge system and method for capacitor of modular multi-level matrix converter
  • Pre-charge system and method for capacitor of modular multi-level matrix converter

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the drawings and embodiments.

[0031] Such as figure 1 As shown, a 3×3 modular multilevel matrix converter M is given 3 A schematic diagram of the topology structure of C, in which there are 9 matrix units, and each matrix unit is composed of N H-bridge sub-modules 3SM in series with reactor L; Figure 1a The structure diagram of the matrix unit is given, Figure 1b The topological structure diagram of H-bridge submodule 3 is given, which is composed of two bridge arms a and b. Bridge a is composed of two upper / lower power switch tubes (Sa1 and Sa2) with anti-parallel diodes in series, and bridge b The arm consists of two upper / lower power switch tubes (Sb1 and Sb2) with anti-parallel diodes connected in series. The two bridge arms a and b are connected in parallel and then connected in parallel with the capacitor C.

[0032] Such as figure 2 As shown, the modular multilevel matrix converter 1M 3 The ...

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Abstract

The invention relates to a pre-charge system and a method for a capacitor of a modular multi-level matrix converter (M<3>C). The pre-charge system and the system achieves pre-charge of the capacitor of the M<3>C and system starting of the M<3>C and have the advantages that pre-charge time of the capacitor is greatly shortened, power loss of a current limiting resistor is reduced and the control is simple. The pre-charge system comprises the M<3>C; an input end of the M<3>C is connected with a series starting current limiting resistor R, a by-pass switch K1, a breaker K2 and an alternating current power supply in sequence; and an output end of the M<3>C is overhung. The pre-charge method comprises the steps that H bridge sub-modules of the M<3>C are divided into two groups, and the capacitor is pre-charged by group.

Description

Technical field [0001] The invention relates to a modular multilevel matrix converter capacitor precharging system and method. Background technique [0002] Modular Multilevel Matrix Converter (MMMC or M 3 C) The topology adopts cascaded, modular, and matrix structure, and multi-level stepped voltage can be obtained without direct series connection of power devices. It has lower dU / dt and lower voltage harmonic content. It adopts AC-AC Conversion technology has broad application prospects in medium / high-voltage large-capacity frequency conversion systems. Such as figure 1 Shown is 3x3 three-phase CM 3 C converter topology, in the figure, the three-phase input / output are connected by 9 matrix units, each matrix unit is formed by cascading N sub-modules (Sub-modular, SM) and inductors, such as Figure 1a As shown, each sub-module SM has an H-bridge structure, such as Figure 1b As shown, the same capacitor C is connected in parallel on the DC side of the sub-module. The Chinese Pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36
Inventor 王广柱
Owner SHANDONG UNIV
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