Study on SVG Control Method Based on Reactive Open Loop

Aiming at the series of problems of power quality such as low power factor, large reactive power deficiency and the presence of harmonic interference leading to high harmonic content, which are caused by non-linear load in the system, a reactive power open loop control strategy is proposed in this paper. This control strategy improves the conventional indirect current control method, and uses the voltage outer loop of reactive power control to control the power factor parameter. The basic method is as follows: the reactive current of the system is controlled by a series of controls after comparison of a given ideal power factor with the actual power factor. Finally, the involved system is simulated and modeled by PSCAD tool. The simulation results show that, with this improved control strategy, the SVG can compensate the reactive power of the system through accurately responding to the dynamic changes of reactive power in the system.