JPH0230246U

JPH0230246U -

Info

Publication number: JPH0230246U
Application number: JP10847688U
Authority: JP
Priority date: 1988-08-18
Filing date: 1988-08-18
Publication date: 1990-02-26

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例の瞬時電圧低下補
償装置の構成を示すブロツク図、第２図は不感帯
特性を示す特性図、第３図は第１図の各部のタイ
ムチヤート、第４図は従来例の構成を示すブロツ
ク図、第５図は第４図の各部のタイムチヤートで
ある。１……電力系統、２……負荷、３……インバー
タ回路、５……バイパススイツチ、１１……系統
電圧検出回路、１３……基準正弦波発生回路、１
４……瞬時電圧低下検出回路、１５……第１の演
算回路、１８……補償作動制御回路、２０……イ
ンバータ制御回路、２１……インバータ電流検出
回路、２２……増幅回路、２３……第２の演算回
路。 Figure 1 is a block diagram showing the configuration of an instantaneous voltage drop compensator according to an embodiment of this invention, Figure 2 is a characteristic diagram showing dead zone characteristics, Figure 3 is a time chart of each part of Figure 1, and Figure 4. 5 is a block diagram showing the configuration of a conventional example, and FIG. 5 is a time chart of each part of FIG. 4. DESCRIPTION OF SYMBOLS 1...Power system, 2...Load, 3...Inverter circuit, 5...Bypass switch, 11...System voltage detection circuit, 13...Reference sine wave generation circuit, 1
4... Instantaneous voltage drop detection circuit, 15... First arithmetic circuit, 18... Compensation operation control circuit, 20... Inverter control circuit, 21... Inverter current detection circuit, 22... Amplification circuit, 23... Second arithmetic circuit.

Claims

[Scope of utility model registration request]

An inverter circuit for instantaneous voltage drop compensation inserted in series between the power system and the load, a bypass switch that bypasses the output end of this inverter circuit, and an inverter circuit that is in phase with the grid voltage of the power system and corresponds to a normal voltage. a reference sine wave generation circuit that generates a reference sine wave voltage having an amplitude of , a grid voltage detection circuit that detects the grid voltage of the power grid and outputs a voltage corresponding to the grid voltage, and a predetermined normal voltage of the power grid. an instantaneous voltage drop detection circuit that detects the occurrence of an instantaneous voltage drop that exceeds 50%; an inverter current detection circuit that detects the output current of the inverter circuit and generates a voltage corresponding to the inverter output current; an amplifier circuit that amplifies the voltage corresponding to the output current; a first arithmetic circuit that obtains a differential voltage by subtracting the voltage corresponding to the grid voltage from the reference sine wave voltage; and a differential voltage output from the first arithmetic circuit. a second arithmetic circuit that subtracts the output voltage of the amplifier circuit and outputs a compensation signal voltage;
an inverter control circuit that outputs a compensation voltage from the inverter circuit by switching-controlling the inverter circuit according to a compensation signal voltage output from the second arithmetic circuit; and an instantaneous voltage drop occurrence in the instantaneous voltage drop detection circuit. An instantaneous voltage drop compensator comprising a compensation operation control circuit that opens the bypass switch and activates the inverter control circuit in response to a detection output.