Using battery energy storage system in a deregulated environment to improve power system performance

This paper embodies recent work at the Hong Kong Polytechnic University on the application of energy storage in general and BESS in particular in four areas: control of active and reactive power, load leveling, power quality improvement and power flow controller. The research aims at developing novel strategies for controlling those dynamic problems and investigating the advantages and limitation of BESS for the applications investigated. This paper discusses the hardware configuration and software technologies currently being used to implement some of the above objectives, in particular, the fast control of active and reactive power demand and generation when a BESS is connected to the grid. The proposed three-phase multi-purpose BESS will provide active and reactive power independent of the supply voltage with excellent power quality in terms of its waveform.