Novel voltage control for embedded generators in rural distribution networks

Connection and use of embedded generators in distribution networks have been increasing in many parts of the world. These embedded generators, depending on operating characteristics and location, can significantly affect the voltage profile, fault level and subsequently the optimum protection settings of the networks. Large embedded generators in the MW range could, however, have potential to support voltage profile besides providing peak lopping and deferring network reinforcement. This paper describes a case study involving Northern Ireland's 11 kV distribution network and demonstrates the use of an embedded generation scheme in deferring network reinforcement and providing assistance during the re-supply of the network. The effects of various excitation controllers of the scheme on the network voltage profile are presented. Laboratory tests and computer simulations have shown that the embedded generator with a novel excitation controller can provide voltage support to the network.