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| Improved Interconnected Communication State of Charge Droop Control and Power Balance Optimization |
| Chai Xiuhui1, Zhang Chunjiang1, Chai Jianguo2, Zhao Xiaojun1, Jiao Meng1 |
1. College of Eletrical Engineering Yanshan University Qinhuangdao 066004 China;
2. Institute of Tianjin Aerospace Mechanical and Electrical Equipment Tianjin 300457 China |
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Abstract As an integral part of the DC microgrid, the distributed energy storage system plays an important role in suppressing system energy fluctuations and maintaining system power balance. In order to improve the reliability of the energy storage system, the interconnected communication state of charge (SOC) droop control strategy is studied. Firstly, the system performance and existing problems of the traditional interconnected communication SOC droop control are analyzed. Secondly, the improved interconnected communication SOC droop control strategy is proposed, that is, a variation coefficient is introduced on the basis of the traditional interconnected communication SOC droop control. Thirdly, through the analysis of the system performance of the improved interconnected communication SOC droop control, the design method of variation coefficient parameters is obtained, which not only improves the power convergence speed of the system, but also limits the maximum power output, thereby improving the reliability of the system. Finally, the energy storage system consisting of two energy storage modules is simulated and tested. The results verify the rapidity of the improved strategy and its limitation on the output power.
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Received: 11 July 2020
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2021, Vol. 36 
