A Realization Method of Excitation System of 750kv Magnetically Controlled Shunt Reactor

Abstract

The invention relates to the field of power system reactive power compensation, in particular to a 750 kV magnetic-control type controllable paralleling reactor excitation system and an achieving method of the 750 kV magnetic-control type controllable paralleling reactor excitation system. Energy is obtained by a magnetic-control type controllable paralleling reactor compensation winding bus through self-excitation type rectifying units in an excitation system, excitation current is supplied to a control winding of a magnetic-control type controllable paralleling reactor. Two groups of self-excitation type rectifying units form a main preparing pair, online redundancy is carried out, and switchover can be achieved by means of triggering and pulse blocking. Pre-excitation in the process of load closing of an electric transmission line can be achieved by means of energy obtaining of a station used variable side bus through an external excitation type rectifying unit in the excitation system, overvoltage of the load closing is restrained, and the groups of the rectifying units are in a stand-by condition in the normal operation of the magnetic-control type controllable paralleling reactor. The 750 kV magnetic-control type controllable paralleling reactor excitation system and the achieving method of the 750 kV magnetic-control type controllable paralleling reactor excitation system solves the contradiction between the limitation of overvoltage of the 750 kV electric transmission line and reactive compensation. The magnetic saturation level of an iron core of the magnetic-control type controllable paralleling reactor is changed due to the fact that the excitation system is controlled by the thyristor, and smooth adjustment of the capacity of the magnetic-control type controllable paralleling reactor can be achieved.

Description

technical field

[0001] The invention relates to the field of reactive power compensation in electric power systems, in particular to a method for realizing an excitation system of a 750kV magnetic control type controllable shunt reactor. Background technique

[0002] In order to solve the problem of extremely unbalanced distribution of primary energy such as coal and water conservancy and load centers, it is necessary to use large-capacity, long-distance EH / UHV lines to transmit electric energy. The huge capacitive charging power, drastic power flow changes and limited insulation margin of EHV / UHV AC transmission lines put forward higher requirements for reactive power regulation and overvoltage suppression of the system, limiting the gap between overvoltage and reactive power regulation The contradiction is prominent, and the conventional reactive power compensation device is difficult to solve. The controllable shunt reactor can solve the contradiction between limiting ov...

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