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Matrix converter

A matrix converter and power conversion technology, applied in the field of matrix converters, can solve problems such as open-circuit commutation failure of the output phase, error, short-circuit commutation failure between input phases, etc.

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

[0083] [1.1. Structure of matrix converter]

[0084] 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.

[0085] 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

[0249] 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 output voltage vector. 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.

[0250] Figure 29 It is a diagram showing a configuration example of a matrix converter 1A according to the second embodiment. Such as Figure 29 As shown, matrix converter 1A of the second embodiment includes power conversion unit 10 , LC filter 11 , input voltage detection unit 12 (not shown), output current detection unit 13 , control unit 14A, and output voltage detection unit 15 . The output voltage detection unit 15 detects output...

no. 3 approach

[0268] 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 an input voltage vector. 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.

[0269] Figure 30 It is a diagram showing a configuration example of the matrix converter 1B of the third embodiment. Such as Figure 30 As shown, the matrix converter 1B of the third embodiment includes a power conversion unit 10 , an LC filter 11 , an input voltage detection unit 12 , an output current detection unit 13 , and a control unit 14B.

[0270] The control unit 14B includes a voltage command calculation unit 30 (not shown), a PWM...

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Abstract

A matrix converter includes a power conversion section and a control section. The power conversion section includes bidirectional switches each having a conducting direction controllable by switching elements. The bidirectional switches are disposed between input terminals coupled to phases of an AC power source and output terminals coupled to phases of a load. A first commutation control section performs commutation control based on a first commutation. A second commutation control section performs the commutation control based on a second commutation. A selection section selects between the first and second commutation control sections and to perform the commutation control based on a vector of an output current or an output voltage from the power conversion section or a vector of an input voltage or an input current from the AC power source to the power conversion section.

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, phase-to-phase short-circuit of the input phase, open-circuit of the output phase, and the like 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 curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/297
CPCH02M5/293H02M2005/2932H02M5/297H02M5/2932
Inventor 猪又健太朗森本进也
Owner YASKAWA DENKI KK
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