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.

The presence of distributed generation (DG) significantly changes the nature of a distribution network. The original design of distribution networks does not consider bidirectional power flow, voltage rise and other issues associated with the operation of DG. Consequently standard operational strategies are unable to deal with those challenges [2] and novel schemes are required. SuperTAPP n+ is one of the innovative voltage control schemes to support DG in the distribution networks [1, 3]. This scheme, based on estimation techniques, uses only local measurements to adjust the voltage target at the primary substation in order to optimise the voltage profile of the network and increase its ability to accommodate DG. This paper presents a SuperTAPP n+ trial and its outcome in part of the EDF Energy distribution network. The paper also demonstrates simulation software which allows planning engineers to determine whether a SuperTAPP n+ scheme could resolve voltage rise issues associated with the presence of DG or increase the amount of DG in a particular network. Results from both the simulation software and the SuperTAPP n+ field trial, presented in this paper, give an opportunity to validate the modelling process and software simulation tool as well as providing evidence of effectiveness of the scheme in distribution networks with DG. Finally, suitability of the SuperTAPP n+ scheme and its applications are discussed and detailed conclusions are presented.

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Change in consumer behaviour through uptake of low carbon technologies is likely to put existing distribution networks under strain and worsen the operational requirements of the network. Deployment of energy storage and power electronics is a feasible alternative to traditional network reinforcement. This study presents two control algorithms used with an energy storage device deployed as part of New Thames Valley Vision Project. The two algorithms are aimed at (i) equalising phase loading with correction of power factor and (ii) providing voltage support with Additive Increase Multiplicative Decrease algorithm for active and reactive power control.