Comparative analysis of voltage control strategies in distribution networks with distributed generation

One of the major problems in development of distributed generation (DG) is voltage control derived from reverse power. In order that voltage variation may not degrade customer voltage supply quality, feeder voltage should be maintained within the permissible range against DG connection. To improve the voltage profile in distribution network with DG, this paper proposes several voltage control strategies that incorporate existing voltage control device and reactive power compensator. Various degrees of integration ranging from a simple local based control of generation to a coordinated control between distribution and generation facilities are introduced. Their effects on voltage profile are tested and further on penetration increment of DG are analyzed using a practical distribution system.