Optimal voltage regulation of a distribution network by output power management of DGs

The integration of Distributed Generation (DG) into distribution networks is associated with large practical problems. With the large variation in load demand and the high penetration level of these distributed energy resources, the voltage stability issue has become a prime concern for the system operator. This paper proposes an optimal voltage control method for regulating the voltage of LV distribution network with DGs whenever the voltage at any bus exceeds normal operating limits. The algorithm is based on the voltage sensitivities to active and reactive power. The voltage regulation is achieved by power output management of DGs with re-dispatching their power outputs using Nonlinear Programming (NLP) optimization technique. The algorithm is tested on standard IEEE-33 bus radial distribution system and the result obtained shows the effectiveness of the proposed algorithm.