Study on Power Optimization Method and Coordinated Control Strategy of Optical Storage Microgrid

doi:10.11985/2022.01.004

Abstract

Abstract:

As a friendly power generation mode, optical storage microgrid has the advantages of stabilizing grid side power fluctuation, stabilizing photovoltaic (PV) power generation capacity and schedulability. It is the preferred scheme to realize the stable operation of ‘source-network-load-storage’ system and the full absorption of new energy. Based on the power optimization and flexible operation of optical storage microgrid, a component level configuration scheme and coordinated control strategy are proposed to further release the potential of PV power generation and promote the efficient operation of energy storage unit. Firstly, aiming at the barrel effect caused by PV module mismatch and low efficiency of energy storage converter, PV module power optimizer and energy storage partial power converter are configured respectively to maximize the utilization of solar energy and electric energy. Secondly, the multi-mode switching of PV array and energy storage unit under on/off grid conditions is discussed. Considering the power dynamic balance among the units of microgrid, a coordinated control strategy of optical storage microgrid is proposed to realize the smooth switching and power automatic distribution of each unit between different control modes. Finally, a 30 kW optical storage microgrid simulation platform is built by using Matlab/Simulink to verify the feasibility and effectiveness of the proposed coordinated control strategy.

Key words: PV module power optimizer, energy storage partial power converter, power balance, coordinated control strategy

CLC Number:

TM561

LIU Yandong, HU Yiwen, CHEN Nan, WANG Jingyue, SHAO Xinming, PEI Zhongchen, LIU Chuang. Study on Power Optimization Method and Coordinated Control Strategy of Optical Storage Microgrid[J]. Journal of Electrical Engineering, 2022, 17(1): 22-30.

Figures/Tables 19

References 15

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参数	数值
直流母线电压参考值U_{dc_ref}/V	600
低压侧交流母线电压U_G/V	220
光伏组件短路电流I_sc/A	5.96
光伏组件开路电压U_oc/V	64.2
光伏组件最大功率点电流I_m/A	5.58
光伏组件最大功率点电压U_m/V	54.7
储能电池组电压U_ESS/V	500
储能电池组容量/(A·h)	20
储能电池组限值[SOC_L, SOC_H](%)	[20, 80]