Effect Evaluation of Reactive Power Control Method According to PV Power Output on Required Capacity of SVC and Distribution Line Loss

Abstract

When a large number of photovoltaic (PV) power generations are installed in the distribution system, it is expected that distribution line voltage will fluctuate by the PV output. Then, the large capacity of SVC may be required because the distribution line voltage cannot be controlled by only SVR operation. In this paper, a reactive power control method in proportion to the PV output change is proposed to reduce the capacity of SVC by complementing SVR operation. By the simulation analyses, it was shown that the capacity of the SVC was reduced by the proposed reactive power control. In addition the distribution line loss of the proposed method was smaller than that of the constant power factor control.