Research on Dynamic Droop Control of Energy Storage Converter in DC Microgrid

Yaxu WANG; Weigong SONG; Yongjun LI; Chunqiang WANG

doi:10.16513/j.2096-2185.DE.2106014

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Distributed Energy ›› 2021, Vol. 6 ›› Issue (2) : 61-67. DOI: 10.16513/j.2096-2185.DE.2106014

Basic Research

Research on Dynamic Droop Control of Energy Storage Converter in DC Microgrid

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Abstract

Considering the power distribution and bus stability of DC microgrid, a dynamic droop control method of energy storage converter based on the state of charge of energy storage battery was proposed. By introducing the real-time SOC value of energy storage battery into the droop control coefficient, the load differential power was distributed among the parallel energy storage batteries according to their own SOC value, so as to realize the balance of power output and SOC secondary control of DC bus voltage and compensation of virtual impedance can restrain DC bus voltage deviation caused by droop control, improve damping characteristics of DC converter and enhance dynamic stability of DC bus voltage. The control parameters were analyzed by Matlab/Simulink simulation, and the correctness of the proposed control strategy was verified.

Key words

DC microgrid / converter / state of charge(SOC) / droop control / dynamic characteristics

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Yaxu WANG , Weigong SONG , Yongjun LI , et al. Research on Dynamic Droop Control of Energy Storage Converter in DC Microgrid[J]. Distributed Energy Resources. 2021, 6(2): 61-67 https://doi.org/10.16513/j.2096-2185.DE.2106014

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