Voltage compensation device

A voltage compensation and compensation circuit technology, which is applied in the direction of AC network voltage adjustment, output power conversion device, electrical components, etc., can solve the problems that hinder the simplification of the device structure, and achieve the effect of simplifying the circuit structure, small and cheap device structure

Inactive Publication Date: 2005-10-05
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This hinders the simplification of the device configuration

Method used

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Examples

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Embodiment Construction

[0018] Embodiment 1

[0019] Embodiment 1 of the present invention will be described below. figure 1 It is a schematic configuration diagram of the voltage compensating device according to Embodiment 1 of the present invention.

[0020] Such as figure 1 As shown, the compensation circuit 2 , which is the voltage generating part, is connected in series with the AC power source 1 , and the compensation circuit 2 outputs a compensation voltage which is superimposed on the power supply voltage to compensate the voltage variation of the load 3 . Also, the short-circuit switch 4 of the bypass compensation circuit 2 is connected in parallel with the compensation circuit 2 . In addition, based on information from the voltage detection unit 5 that monitors the power supply voltage, the control unit 6 generates a control signal to control the short-circuit switch 4 and the switching elements in the compensation circuit 2 to perform power supply control. 7 is a circuit breaker provide...

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PUM

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Abstract

The invention obtains a voltage compensator for compensating voltage variation of a load 3 by superposing a compensation voltage outputted from a compensation circuit 2 on a power supply voltage in which unnecessary voltage compensation operation is stopped by quickly detecting turn-off of a breaker provided in the upstream. A voltage detecting section 5 for detecting a power supply voltage has a means for detecting the phase of the power supply voltage. When the phase of the power supply voltage varies more than a predetermined amount from a reference phase during compensation operation, a decision is made that a breaker in the upstream is turned off and compensation operation is ended.

Description

field of invention [0001] The present invention relates to a voltage compensating device which superimposes a compensation voltage on the power supply voltage to compensate for the voltage drop when the power supply voltage supplied to a load drops. Background technique [0002] The instantaneous drop of the power system voltage caused by lightning or the like will cause malfunction or temporary stoppage of precision equipment in factories, etc., often causing great damage to the production line. In order to prevent such hazards, a voltage fluctuation compensating device that monitors voltage fluctuations such as instantaneous voltage dips (hereinafter referred to as dips) in the power system and compensates for voltage fluctuations is used. [0003] A conventional voltage fluctuation compensating device is composed of a plurality of voltage compensating circuits connected in series to a power system and outputting a compensating voltage with either positive or negative pola...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/12H02J3/38H02M5/293H02M7/42
Inventor 畠山善博冈田丈二
Owner MITSUBISHI ELECTRIC CORP
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