Control of bi-directional converter in battery energy storage system (BESS) for peak power shaving

The issue that the isolated flexible electric grid face is short time peak power (active and reactive) demand for starting of induction motor, in this short time the generation can not ramp up for keeping up with the demand and then the starting up can be failed. This paper presents a scaled down Battery Energy Storage System (BESS) for peak load shaving applications. The design includes a bi-directional converter capable of interfacing a battery bank with the AC power gird. In order to match dynamic response of the BESS and to take simplicity for implementation algorithms based on microprocessor of digital signal processing systems (DSP), the authors propose a conventional PID controller for the BESS. The experiment shows good results.