Anti-overcompensation control strategy in SVC based on steinmetz principle and instantaneous reactive power theory

SUN Cong， WANG Yi-fan， CHEN Guo-zhu， WU Xin-ke
（College of Electrical Engineering， Zhejiang University， Hangzhou 310027， China）

Abstract： Aiming at the problem of reactive power overcompensation in the distribution network，a new compensation algorithm in which the power factor can be set randomly was deduced after studying current principles for unbalanced load compensation and modifying the compensation conditions of the Steinmetz principle. The algorithm supported by instantaneous reactive power theory，derives the general formula of compensatory admittance. It can be used as the control strategy of static var compensator （SVC） to balance the three-phase active power；compensate loads to specified power factor and effectively prevent reactive power feeding inversely caused by overcompensation. Simulation was carried out in the Matlab power system simulation environment. The results indicate that the proposed algorithm has high precision and good dynamic characteristics.
Key words： static var compensator（SVC）； instantaneous reactive power theory； unbalance compensation； adjustable power factor