Voltage fluctuation and flicker suppression by controllable reactor with robbustness control strategy

High power and nonlinear loads are the main equipment which have caused the voltage fluctuation, flicker and harmonic distortions. Power quality deteriorates and net loss increases resulted from voltage fluctuation, flicker and harmonic distortions with numerous high power and nonlinear loads accessed in power grid, which has affected the safety and stable operation of the power grid. Therefore, suppression of the harmonic distortion, voltage fluctuation and flicker is crucial. This paper take voltage grading and district dividing as background, an improved static var compensator (SVC) based controllable reactor with robustness control strategy is proposed in this paper. The improved SVC is available for higher voltage level in grid voltage grading and district dividing. The saturation degree of the controllable reactor is adjusted according to the fluctuation value of the reactive power, which can change the reactive power supplied by the reactor, thus the voltage fluctuation, flicker and harmonic distortion can be effectively suppressed.