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Control device for matrix converter and output voltage generating method thereof

A matrix converter and control device technology, applied in the direction of conversion of AC power input to AC power output, conversion of AC power input to DC power output, output power conversion device, etc., can solve resonance, undisclosed correction, peripheral equipment adverse effects

Inactive Publication Date: 2011-05-04
YASKAWA DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the conventional matrix converter, which is a power converter that does not convert AC to DC but performs direct conversion, there is the following problem. The input filter provided to prevent the fluctuation of the input current caused by the carrier frequency used in PWM control from flowing out If there is a resonant frequency in the converter, when the thyristor converter is connected to the same power system or the input voltage is distorted, the resonance phenomenon will occur, which will have a bad effect on the peripheral equipment, or due to the improvement of the resistance of the input filter and buffer circuit connected to the main circuit part. pressure on such measures to increase the cost
In addition, in the conventional matrix converter device, no method of correcting the variation caused by the input side is disclosed

Method used

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  • Control device for matrix converter and output voltage generating method thereof
  • Control device for matrix converter and output voltage generating method thereof
  • Control device for matrix converter and output voltage generating method thereof

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Experimental program
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Embodiment 1

[0044] A first embodiment of the present invention will be described with reference to the drawings.

[0045] figure 1 It is a block diagram of a control device for a matrix converter embodying the present invention. In the figure, 1 is a matrix converter, and a three-phase power supply is supplied from a three-phase power supply 40 through a reactance 3, and a load 7 is connected to the output side. 2 is a main circuit part, which is composed of a bidirectional semiconductor switching element, and is generated by PWM from below. Driven by the gate signal of the section 11, power conversion is performed in both directions. 5 is an input filter, which consists of a reactance 3 and a capacitor 4, and is provided between the three-phase power supply 40 and the input side of the matrix converter 1. In addition, the reactance 3 is constituted by an internal reactance of the three-phase power supply 40 or a reactor provided on wiring between the three-phase power supply 40 and th...

Embodiment 2

[0078] Next, a second embodiment of the present invention will be described with reference to the drawings.

[0079] image 3 is a block diagram showing the configuration of the second embodiment, and the symbols and symbols in the figure are omitted. figure 1 For the description of the same structure, different parts are described below. The first embodiment is characterized by having an input voltage command operation command 12 and a capacitor voltage detector 13, but the second embodiment differs from the first embodiment in that instead of directly detecting the capacitor terminal voltage V c , to detect the capacitor current vector I c , according to the I c Find the capacitor voltage vector V c .

[0080] The pulse width modulation correction unit 14 utilizes the capacitor current I detected by the capacitor current detector 15 c Calculate the capacitor voltage vector V by formula (8) c .

[0081] V c =(1 / C)∫I c dt...(8)

[0082] In this way, due to the oper...

Embodiment 3

[0084] Next, a third embodiment of the present invention will be described with reference to the drawings.

[0085] Figure 4 is a block diagram showing the configuration of the third embodiment, and the symbols and symbols in the figure are omitted. figure 1 For the description of the same structure, different parts are described below. The first embodiment is characterized by having an input voltage command operation command 12 and a capacitor voltage detector 13, but the third embodiment differs from the first embodiment in that instead of directly detecting the capacitor terminal voltage V c , detect the input current Iin flowing to the matrix converter 1, and calculate the capacitor voltage vector V according to the Iin c .

[0086] The pulse width modulation correction unit 14 utilizes the input current Iin flowing to the matrix converter 1 detected by the input current detector 16, by considering the output current I out Equation (9) of the current vector IL distri...

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PUM

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Abstract

Provided is a matrix converter device with which the capacitor voltage of a filter provided on the input side approximates a sinusoidal wave and with which the peak value is also reduced, in which an input filter using a capacitor with a low breakdown voltage can be used, and that can significantly alleviate effects on peripheral devices. It is equipped with a pulse width modulation part (10) that uses the capacitor terminal voltage value and the input voltage value of the filter provided on the input side, and the output current value of the matrix converter to generate a PWM pulsed command signal.

Description

technical field [0001] The present invention relates to a control device and an output voltage generating method of a power converter which does not convert AC to DC but directly converts it. Background technique [0002] As an existing power converter that does not convert AC to DC but performs direct conversion, there is a matrix converter, and its control device usually generates an output line-to-line voltage command V in the shape of a PWM pulse. ref , the size of the output line-to-line voltage is controlled by the area of ​​the PWM pulse, and the input current is close to a sine wave through the ratio of the PWM pulse described later. [0003] Figure 8 The output line-to-line voltage of the matrix converter is expressed in the form of a PWM pulse. exist Figure 8 Among them, 111 is the pulse of the part determined by the potential difference between the minimum potential phase and the intermediate potential phase, 112 is the pulse of the part determined by the poten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/27H02M5/293H02M5/297
CPCH02M5/297H02M7/53871H02M1/0022
Inventor 上田洋三末永龍二渡邊英司
Owner YASKAWA DENKI KK