Analysis Of Electric Network’s Reactive Power Compensation And Benefit Of The Jinshi Power Supply

With the continuous development of the economy, the asymmetric load, the highpower load and the nonlinear load have brought a mass of harmonic pollution andmore and more reactive shortage to power grids. The problems of power qualityinfluence people’s daily life and work seriously, experiences tell us that sufficientreactive power reserve should be left in the modern power grid which can providedynamic voltage support.In this paper, the SVC control algorithm is mainly studied the voltage control,the negative sequence compensation and power factor are added to the expert decisionsystem, which will use the optimal control strategy in different operating conditionsautomatically. The voltage control model adopts the PI control method which basedon the simplex optimization algorithm, and the Automatic Gain Control (AGC)module and susceptance regulator conditioners module are also used in the VoltageControl, which realize automatic continuous control of the controller gain when thesystem operation modes change, insure that always obtain the stable response and toimprove the SVC’s resistance ability to the system fault. According to the power gridunbalance phenomenon, the negative sequence compensation is studied, and proposesa fuzzy-PI control algorithm according to the power factor control. It adopts the fuzzycontrol in dealing with the fluctuating of the power factor, and when the system isshaken, it adopts PI control. The control strategy is demonstrated by constructingPSIM model, and gets good effect.The paper improves the control method and the research device of SVC，analyzesthe reactive power optimization and its economic benefits and social benefitscombining with the power supply system at the Jinshi, and analyzes the technicalefficiency, power factor and the power grid harmonic distortion rate on low voltagereactive power compensation of10kV grid lines and distribution transformer. werecommends that transformer substation uses dynamic smoothing SVC mode, installsSVQR type reactive power automatic compensation, adopts the variable concentratedcompensation in the low voltage side and the compensation in medium pressure line mode when the system has no harmonic circuit, and adopts the reactive powercompensation and filtering mode when the system has harmonic circuit. Thetraditional design method of reactive power compensation for substation should bereformed.