Coordinated voltage control for active network management of distributed generation

Existing approaches to the design, control and operation of 11 kV distribution networks often restrict optimal utilization. When confronting the increasing demand and growing amount of distributed generation being connected to the networks, it is essential for distribution system operators to employ new and more active network management practices. This paper presents and discusses a range of active voltage management schemes based on coordinated voltage control. These schemes can be used to improve the voltage profile in 11kV distribution networks and increase their ability to accommodate distributed generation. Technical limitations and commercial barriers are discussed. Two case studies based on EDF energy distribution systems are presented. Both systems experienced voltage issues associated with the presence of distributed generation and innovative active control scheme trials have been installed. The functionality of each scheme is assessed based on a number of factors such as: ability of the scheme to increase network capacity, reliability and accuracy.