Droop-Free Distributed Energy Storage Control Based on Diffusion Algorithm

doi:10.16183/j.cnki.jsjtu.2022.487

Abstract

Abstract:

A droop-free distributed energy storage control strategy based on the diffusion algorithm is proposed to address the inability of droop control to simultaneously achieve bus voltage stability and accurate power distribution among energy storage systems when the line impedance is mismatched and bus voltage is inconsistent. First, the diffusion algorithm is applied to the distributed estimation of direct current (DC) microgrid to obtain the global average, and the difference between the voltage rating and the average voltage is used as a compensation term to restore the bus voltage deviation. Then, in order to achieve the accurate distribution of power between energy storage systems with different rated capacities and different states of charge (SOC), a standard power of energy storage is designed and the difference between the standard power and the average standard power is used as a compensation term for the equilibrium of SOC between energy storage systems. Finally, a model based on RT-LAB is built to verify the effectiveness of the designed control strategy in four different operating modes. The experimental results show that the proposed control strategy can achieve the bus voltage recovery and the accurate distribution of energy storage power in the isolated DC microgrid.

Key words: direct current (DC) microgrid, diffusion algorithm, free droop control, distributed control, precise power distribution

CLC Number:

TM727

MI Yang, ZHANG Haojie, QIAN Yiming, XING Haijun, GONG Jinxia, SUN Gaiping. Droop-Free Distributed Energy Storage Control Based on Diffusion Algorithm[J]. Journal of Shanghai Jiao Tong University, 2024, 58(6): 836-845.

Figures/Tables 12

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参数	符号	数值	参数	符号	数值
电压补偿PI	k_Pv	0.01	线路阻抗/Ω	R_line2	0.5
电压补偿PI	k_Iv	0.005	线路阻抗/Ω	R_line3	0.3
功率分配PI	k_PP	2	ESU1容量/(A·h)	C₁	150
功率分配PI	k_IP	10	ESU2容量/(A·h)	C₂	100
线路阻抗/Ω	R_line1	0.1	ESU3容量/(A·h)	C₃	50