The impact analysis of distribution grid based on Battery energy storage system

The voltage variation caused by increasing renewable energy generation can be attenuated effectively by using Battery energy storage system (BESS). Firstly, the widely used PNGV method is adopted to build the battery cells model in this paper. Then, the identification methods of electrochemistry battery´s electrical equivalent circuit are introduced according to `continuous function analytic expression´ and `difference equation´ respectively. The experimental results show that the identified parameters are agreed with simulation data very well. Meanwhile, the low-frequency equipment model of converter is proposed by neglecting high frequency components since the main performance is determined by the fundamental frequency. The classical distribution grid is established using EMTP_RV software, including the battery storage system, converter, various power load, etc. The study results reported in this paper indicate that the battery storage system can effectively attenuate over-voltage and support the power grid. Furthermore, the proposed modelling method can be used to further analyse the optimization of BESS location and capacity.