Improving Voltage Stability Margins of Radial Distribution System Using DR Based P-Q Control

The demand response technology can be effectively used as an efficient resource for providing ancillary services to the distribution systems for improving voltage profiles and voltage stability margins. This paper proposes a demand response based scheme to improve the voltage stability margins of the distribution networks. The energy storage capacity and the reactive power exchange capability of the residential sector battery energy storage devices is used to provide active/reactive power support and minimize load shedding. The consumers are offered incentives for centralized power transfer control of batteries through demand response. The simulations are performed on the standard IEEE 33 bus distribution network with different levels of demand response participation of battery energy storage. The results show that the power exchange capability of the battery storage systems through centralized control could effectively improve the voltage stability margins of the distribution systems with substantial reduction in load shedding.