Cost Effective BESS Design for Building Power Systems

This paper presents a battery energy storage system (BESS) to support peak load shaving and reactive power compensation in building power systems. In order to maximize the usage of BESS functions, this paper proposes a design procedure of an energy storage and sizing an inverter capacity, and its control algorithm based on actual building power data, and desired level of peak power reduction. One of the important control functions is to harmonize between battery energy and reactive power capacity of BESS. In this paper, total saving cost on shaving peak load and compensating reactive power based on the utility commercial rate was assessed. The proposed BESS design and its control algorithm resulted in improved power factor and a reduced peak load demand. To design proper inverter capacity according to the reactive power demand results in more economic benefits. Simulation based on the actual analyzed load data is used to validate and demonstrate the procedure of the proposed BESS design.