Investigation of active voltage control methods for photovoltaic inverters connected to network

Abstract

Photovoltaic power connected the distribution network has changed the power flow, resulting in voltage rise at PCC. Various methods have been proposed to limit the voltage within standard. Different methods were compared in this paper to identify their advantages and disadvantages. First, pure active power was injected in order to study the influence on voltage of each node; then every active voltage-control method was used in a simulation distribution network model to study the static and dynamic properties of the method, and a novel optimal active voltage-control method was brought up, which would meet both static and dynamic properties better. ; then a series of experiments on grid-connected inverters was operated on test-bed to verify the feasibility of the proposed method. At last the summary came into conclusion, and their applicable occasions and the shortcoming of reactive power voltage control were pointed out.