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.