Comparison between conventional and fuzzy logic controller-based AVC relay for voltage control application of distribution networks

Voltage control is considered one of the basic operational requirements of electrical power systems both at distribution and transmission levels. In recent years, a growing number of distributed generators (DGs) are connected to distribution networks. However, the integration of DGs including wind farms into distribution systems causes voltage regulation problems due to the interference with the performance of automatic voltage control (AVC) relay. Therefore, development of a new voltage control scheme of supply system with DGs is required. This paper presents an attempt to design an AVC relay based on fuzzy logic (FL). The structure of the proposed FL controller based-AVC relay is presented. This paper also compares between the performance of conventional and FL controller based-AVC relays to control voltage magnitude of distribution network with and without DGs connected.