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Power conversion system

一种电力变换装置、电力变换器的技术，应用在输出功率的转换装置、电气元件、交流功率输入变换为交流功率输出等方向，能够解决微型计算机成本高等问题，达到低成本化、控制结构简化、易于调整的效果

Inactive Publication Date: 2010-02-10
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, in Patent Document 2, the capacity of the software needs to be increased and the high-speed performance of the microcomputer is required, so there is a problem that the cost for realizing the microcomputer of Patent Document 2 is very high.

Method used

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Experimental program
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Embodiment approach 1

[0036] Hereinafter, embodiments of the power conversion device of the present invention will be described with reference to the drawings.

[0037] figure 1 It is a circuit configuration diagram showing the power conversion device according to Embodiment 1 of the present invention. In the figure, 8 is a single-phase AC power supply, and 1 is a first power converter for converting AC from the AC power supply 8 to DC. 2 is the second power converter that converts the direct current converted by the above-mentioned first power converter 1 into an alternating current of an arbitrary frequency, and applies variable voltage variable frequency (VVVF) control or constant voltage variable frequency (CVVF) control The inverter 3 is an induction motor as an AC rotating machine, and a three-phase voltage is applied from the second power converter 2 .

[0038] In addition, the first power converter 1 is a self-excited rectifier circuit using, for example, a diode rectifier circuit or a bri...

Embodiment approach 2

[0073] Next, refer to Figure 8 The power conversion device according to Embodiment 2 will be described. In this embodiment, the pulsation detection unit 20 and the voltage control unit 21 are different from those in the first embodiment. In Embodiment 1, according to the three-phase voltage command Vu ＊ 、Vv ＊ 、Vw ＊ Effective power is calculated from the three-phase currents iu, iv, and iw, a ripple component is detected from the effective power, and the frequency is corrected using the ripple component. However, in this embodiment, according to the dq-axis voltage command Vd ＊ , Vq ＊ Effective power is calculated from the dq axis currents Id and Iq, and the amplitude of the voltage command is corrected based on the ripple component of the effective power. In addition, other structures are the same as those of the first embodiment, and are also denoted by the same reference numerals in the drawings, and only different parts will be described here.

[0074] Figure 9 It...

Embodiment approach 3

[0089] Next, refer to Figure 10 A power conversion device according to Embodiment 3 will be described. While the AC rotating machine in Embodiment 1 is an induction motor, it is assumed to be applied to the synchronous machine 16 in this embodiment. It is the same as Embodiment 1 up to obtaining the correction amount F_BEET which is the output of the voltage correction means 6, and is also denoted by the same reference numerals in the drawings. Only the voltage control unit 17 is different from the first embodiment. In the first embodiment, the frequency of the voltage output from the second power converter 2 was corrected by detecting the ripple component included in the active power of the second power converter 2 , but in the third embodiment, the active power The pulsation component is detected, and the phase of the voltage command is corrected based on the pulsation component of the effective power.

[0090] The voltage control unit 17 uses the voltage equation of the...

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PUM

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Abstract

A power conversion system includes a first power converter 1 for converting AC to DC, a second power converter 2 for converting DC to AC, current detecting means 4 for detecting output current of thesecond power converter 2, pulsation detecting means 5 for detecting a pulsating component associated with the conversion from AC to DC of the first power converter from a pulsating component containedin at least any one of effective power, power and apparent power of the second power converter 2, voltage correcting means 6 for outputting a correction amount for correcting at least any one of thephase, frequency and amplitude of a voltage to be output from the second power converter 2 on the basis of the pulsating component obtained from the pulsation detecting means 5, and voltage control means 7 for outputting a voltage instruction to be output from the second power converter 2 on the basis of the correction amount obtained from the voltage correcting means 6, wherein the second power converter 2 converts DC to AC on the basis of the voltage instruction obtained from the voltage control means 7.

Description

technical field [0001] The present invention relates to a power conversion device for converting direct current voltage into variable frequency / variable voltage alternating current voltage, and more particularly to an inverter including a converter and inputting its direct current output voltage and converting it into variable frequency / variable voltage alternating current AC-AC power conversion device. Background technique [0002] In this type of power conversion device, since the input voltage of the inverter includes rectification ripples (ripples) caused by the rectification of the converter, an excessive current flows through the inverter and its load, and reverse current may occur. Inverter commutation failure or broken beating (beat) phenomenon. Conventionally, various proposals have been made in order to suppress such a jumping phenomenon of the inverter. [0003] In one of the proposals, a ripple detection unit that detects a ripple component on the DC side of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02P27/06
CPCH02M5/458H02M7/53871
Inventor 河野雅树小林贵彦畠中启太
Owner MITSUBISHI ELECTRIC CORP