Performance comparison of different voltage control schemes on distributed generation

Abstract

The installation of Distributed Generation (DG) can have a significant impact on distribution system voltage regulation. The effects vary according to the DG device: in particular, synchronous generators present voltage control systems which interfere with the voltage regulation of the distribution systems. The paper analyzes two voltage control schemes for synchronous generators connected to MV distribution systems. They are designed according to different approaches: the first one is based on a fixed-parameter PID regulator whereas the second one employs an adaptive self- tuning technique. With reference to a case study, the two schemes are compared in terms of dynamic performance and dynamic interaction with distribution system voltage regulation, which is performed by the On-Load Tap Changer (OLTC) of the supplying HV/MV transformer. systems which interfere with voltage regulation of the distribution system. The paper tackles the problem of comparing the performance achieved by two voltage control schemes on DG synchronous generators. The two schemes are designed according to different approaches: the first one is based on a fixed-parameter PID regulator whereas the second one employs an adaptive self-tuning technique. Particular attention is paid to dynamic performance and dynamic interaction with distribution system voltage regulation, which is performed by the On-Load Tap Changer (OLTC) of the supplying HV/MV transformer. The comparison refers to numerical simulations of a case study.