Consensus Algorithm Strategy of DC Microgrid Based on Sliding Mode Control
Wang Yubin1, Yang Xiaodong2, Xie Luyao1, Zhang Youbing1, Xu Chongbo1
1. College of Information Engineering Zhejiang University of Technology Hangzhou 310023 China; 2. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China
Abstract：For the direct current (DC) microgrid system with multiple battery storage units (BSUs), the traditional droop control will bring problems such as large voltage deviation and unbalanced power distribution. Aiming at the above problems, a multi group energy storage control strategy based on consistency algorithm was proposed. The primary control of the proposed control strategy used the traditional droop control to coordinate multiple DC energy storage systems; the secondary control was based on the consistency algorithm, combined with the voltage observer to observe the bus voltage of each node to effectively improve the DC bus voltage level. On this basis, the battery power was reasonably distributed through the SOC of BSUs and the communication between each converter and its neighbor converter. In addition, considering that under different load fluctuations, the proportional integral (PI) controller often needs to adjust the parameters to make the system have a good performance under a wide range of fluctuations. Furthermore, a better robust sliding mode control (SMC) was proposed, SMC was used to control the error value of output voltage and input current of each converter. The control goal was to force the voltage error and current error to operate according to the set phase trajectory, and then reached the set sliding mode surface to operate stably. Simulation results show that the proposed distributed control strategy has good dynamic performance, and demonstrate that SMC has better robustness and reliability than PI control in dealing with load fluctuation and photovoltaic output fluctuation.
王宇彬, 杨晓东, 谢路耀, 张有兵, 徐崇博. 基于滑模控制的直流微电网一致性控制策略[J]. 电工技术学报, 2021, 36(zk2): 530-540.
Wang Yubin, Yang Xiaodong, Xie Luyao, Zhang Youbing, Xu Chongbo. Consensus Algorithm Strategy of DC Microgrid Based on Sliding Mode Control. Transactions of China Electrotechnical Society, 2021, 36(zk2): 530-540.
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2021, Vol. 36 
