Coordinated control of generation for MV network voltage management

This paper examines the growing issue of voltage management of medium-voltage (MV) distribution networks. These networks, especially in rural areas, often host a growing capacity of renewable generation, in particular wind turbine generators (WTGs). Wind generation in general causes voltage to rise. Such are the exacting voltage control requirements that distribution networks are vulnerable to the variability of wind generation. The paper presents a rigorous procedure for managing the network´s voltage profile by adjusting WTG reactive compensation. The simplicity of the method renders it suitable for on-line use. Simulation studies show how the proposed voltage control scheme keeps voltage within limits in cases where strict adherence to most distribution codes would experience unacceptable voltage excursions. Finally, it will be shown that the approach has the potential to reduce losses. The paper also considers the limits on MV renewable generation imposed by grid reactive power requirements.