Open AccessImproved Droop Control Strategy with Fast Equalization for SOC Based on Power Balance in Energy Storage System
Author(s) -
Heng Zhang,
Shiyu Sun,
Feng Gao,
Bingqing Shi
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/563/3/032024
Subject(s) - voltage droop , overcharge , energy storage , control theory (sociology) , computer science , voltage , matlab , power (physics) , engineering , control (management) , battery (electricity) , electrical engineering , voltage regulator , physics , quantum mechanics , artificial intelligence , operating system
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.