Voltage sag treatment control method and system for frequency converter

Voltage sag treatment control method and system for frequency converter

The invention belongs to the technical field of power systems, and particularly relates to a voltage sag governance control method and system for a frequency converter, and the method comprises the steps: obtaining the voltage and current of an AC side of the frequency converter; calculating the vol...

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Hauptverfasser: SHEN ZHIGUANG, CHI ENXIAN, CAO LICHENG, WANG CAIJIE, ZHANG JINDOU, WANG DETAO, ZHANG XINGGUANG
Format: Patent
Sprache:chi ; eng
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CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
GENERATION
SYSTEMS FOR STORING ELECTRIC ENERGY
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creator SHEN ZHIGUANG
CHI ENXIAN
CAO LICHENG
WANG CAIJIE
ZHANG JINDOU
WANG DETAO
ZHANG XINGGUANG
description The invention belongs to the technical field of power systems, and particularly relates to a voltage sag governance control method and system for a frequency converter, and the method comprises the steps: obtaining the voltage and current of an AC side of the frequency converter; calculating the voltage and the positive sequence impedance of the power grid side according to the obtained voltage and current; judging whether voltage sag occurs on the power grid side according to the obtained power grid side voltage; when the voltage sag occurs at the power grid side, judging the occurrence position of the voltage sag according to the obtained change of the positive sequence impedance at the power grid side; when the obtained positive sequence impedance at the power grid side changes, the voltage sag occurs at the power grid side, and voltage sag treatment is started; and when the obtained positive sequence impedance at the power grid side is not changed, the voltage sag occurs at the load side, and the voltage
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subjects CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
GENERATION
SYSTEMS FOR STORING ELECTRIC ENERGY
title Voltage sag treatment control method and system for frequency converter
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