Development And Engineering Application Of Static Var Compensator

Reactive power compensation has always been a major problem in powerindustry. The early reactive power compensating devices have their disadvantages,leading to their limitations in application. The emergence of static var compensator(SVC) changed this. It can compensate reactive power continuously, smoothly andswiftly, ensuring voltage stability of system node and improvement of power factor. Italso has advantages of good compensating performance and economic benefit, leadingto a fact that it is widely applied and studied. This paper aims at developing TCR+FCSVC at10kV voltage level in several aspects including control strategy, equipmentdevelopment and engineering application. The main research aspects are as follows:First, this paper discusses the detection and control strategies of static varcompensator, conducting research mainly on functions of SVC’s power factorcorrection and keeping grid voltage stable. In consideration of practical applicabilityin engineering, detection of voltage and power factor is based on instantaneousreactive power theory while traditional proportion integration control is used ascontrol strategy. Combining these two functions, the paper proposes a compoundcontrol strategy. Simulation verifies the effectiveness of control. The method has itsusefulness in application and generalization.This paper then develops SVC under10kV voltage level. The development startsfrom high-voltage side of the equipment, introducing selection of thyristor,calculation of number of series thyristors, selection of radiator and hardware design ofthyristor control units. After that, attention is switched to low-voltage side, includingdesign of valve base electronics panel and upper monitor. Then, ex-factoryexperiments and quality tests are presented to prove its reliability. Experimentsincludes single thyristor low voltage triggering, single phase thyristor valve triggering,three phase triggering and BOD breakdown in high voltage side; quality tests arecomposed of valve-ground dielectric strength test, valve-valve dielectric strength testand operating test. The results verify the effectiveness of the design and reliability ofsystem operation.After the development of10kV SVC, the paper conducts the analysis of itsengineering application. First, it analyzes the power quality problem of targetcompany–Casting Center of Guangxi Yuchai Corporation. Based on this, compensation simulation of10kV SVC is conducted to show good performance of theproposed system. In the end, the paper looks in the distance of design of35kV SVC,solving the problems of radiation, isolation and signal procession. Two designschemes, including horizontal type and vertical type design schemes, are proposed.