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Matrix converter

一种矩阵变换器、电力转换的技术，应用在矩阵变换器领域，能够解决输入相相间短路换流失败、误差、滞后电流检测等问题

Inactive Publication Date: 2015-04-15
YASKAWA DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current commutation method, for example, when the output current is small, if there is a delay in polarity switching or a current detection error, etc., commutation failure such as an open circuit of the output phase may occur.
In addition, in the voltage commutation method, for example, when the difference between the magnitude relationship of the input phase voltage is small, if there is a switching lag of the magnitude relationship of the input phase voltage or a voltage detection error, commutation such as a phase-to-phase short circuit of the input phase may occur Failure situation

Method used

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no. 1 approach

[0077] [1.1. Structure of matrix converter]

[0078] figure 1 It is a diagram showing a configuration example of the matrix converter of the first embodiment. Such as figure 1 As shown, the matrix converter 1 of the first embodiment is provided between a three-phase AC power source 2 (hereinafter simply referred to as AC power source 2 ) and a load 3 . Load 3 is, for example, an AC motor. Hereinafter, the R-phase, S-phase, and T-phase of the AC power supply 2 are referred to as input phases, and the U-phase, V-phase, and W-phase of the load 3 are referred to as output phases.

[0079] Matrix converter 1 has: input terminals Tr, Ts, Tt; output terminals Tu, Tv, Tw; power conversion unit 10; LC filter 11; input voltage detection unit 12; output current detection unit 13; Matrix converter 1 converts three-phase AC power supplied from AC power supply 2 via input terminals Tr, Ts, Tt into three-phase AC power of arbitrary voltage and frequency, and outputs it to load 3 through ...

no. 2 approach

[0183] Next, a matrix converter of the second embodiment will be described. The matrix converter of the second embodiment differs from the matrix converter 1 of the first embodiment in that a commutation control unit is selected according to an input voltage phase. In addition, the following description will focus on the differences from the matrix converter 1 of the first embodiment, and components having the same functions as those of the first embodiment will be given the same reference numerals and their descriptions will be omitted.

[0184] Figure 21 It is a diagram showing a configuration example of a matrix converter 1A according to the second embodiment. Such as Figure 21 As shown, matrix converter 1A of the second embodiment includes power conversion unit 10 , LC filter 11 , input voltage detection unit 12 , output current detection unit 13 , and control unit 14A.

[0185] The control unit 14A includes a voltage command calculation unit 30 (not shown), a PWM dut...

no. 3 approach

[0211] Next, a matrix converter of a third embodiment will be described. The matrix converter of the third embodiment differs from the matrix converter 1 of the first embodiment in that a commutation control unit is selected according to the output current phase θo and the input voltage phase θi. In addition, the following description will focus on the differences from the matrix converter 1 of the first embodiment, and components having the same functions as those of the first embodiment will be given the same reference numerals and their descriptions will be omitted.

[0212] Figure 24 It is a diagram showing a configuration example of the matrix converter 1B of the third embodiment. Such as Figure 24 As shown, the matrix converter 1B of the third embodiment has a control unit 14B. In addition, although not shown, the matrix converter 1B further includes a power conversion unit 10 , an LC filter 11 , an input voltage detection unit 12 , an output current detection unit ...

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PUM

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Abstract

A matrix converter includes: a power conversion unit that includes a plurality of bidirectional switches; and a control unit configured to control the plurality of bidirectional switches. The control unit includes: a first commutation control unit configured to perform a commutation control with a first commutation method; a second commutation control unit configured to perform a commutation control with a second commutation method different from the first commutation method; and a selection unit configured to select a commutation control unit that is configured to execute a commutation control from the first commutation control unit and the second commutation control unit based on any one of a phase of an output electric current) from the power conversion unit and a phase of an input voltage to the power conversion unit.

Description

technical field [0001] The invention relates to a matrix converter. Background technique [0002] The matrix converter has a plurality of bidirectional switches for connecting the AC power supply and the load. By controlling these bidirectional switches and directly switching the voltage of each phase of the AC power supply, an arbitrary voltage and frequency can be output to the load. [0003] In the matrix converter, when the phase of the AC power source connected to the load is switched by the bidirectional switch, a commutation operation in which switching elements constituting the bidirectional switch are individually controlled in a predetermined order is performed. Thereby, the phase-to-phase short circuit of an input phase, the open circuit of an output phase, etc. can be prevented. [0004] As the commutation operation, a commutation operation using a current commutation method and a commutation operation using a voltage commutation method are known. In the curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/297
CPCH02M2005/2932H02M5/297H02M5/293H02M5/2932
Inventor 木野村浩史蛭子让治
Owner YASKAWA DENKI KK
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