Improved Droop Control Strategy with Fast Equalization for SOC Based on Power Balance in Energy Storage System

2019 International Conference on Advanced Electronic Materials, Computers and Materials Engineering

无线电电子学;计算机科学;材料科学

Zhang, Heng^1 ; Sun, Shiyu^1 ; Feng, Gaohui^2 ; Shi, Bingqing^3

Army Engineering University, Shijiazhuang, Hebei

050003, China^1

Beijing Qingsheng Electrical Science and Technology Research Institute Co. Ltd., Beijing

100084, China^2

Department of Electrical Engineering, Tsinghua University, Beijing

100084, China^3

关键词: Acceleration factors;    Control strategies;    Energy storage systems;    Energy storage unit;    Improved droop control strategies;    Parallel operations;    Power distributions;    Voltage fluctuations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/563/3/032024/pdf
DOI  :  10.1088/1757-899X/563/3/032024

来源: IOP

【 摘 要 】

In parallel operation of energy storage units, the droop control based on voltage and current tends to neglect the difference of SOC in energy storage unit, which leads to the withdrawal of some energy storage units from the system due to overcharge or overdischarge, thus causing the voltage fluctuation of DC micro-grid bus. To solve this problem, an improved droop control strategy with fast equalization for SOC is proposed. With the SOC of energy storage batteries, the acceleration factor can be calculated in real time, so as to improve the speed of SOC equalization and power distribution. Finally, the validity of the control strategy is verified by simulation results with MATLAB/Simulink.