Abstract：Hybrid energy storage microgrid has the characteristics of non-linearity, strong coupling, strong load disturbance, and flexible switching of parallel/off-grid modes. Aiming at the problem that traditional control is difficult to achieve ideal results, this paper introduces the second-order linear active disturbance rejection control technology (2nd-LADRC) into the control of the interface converter at the load end of the microgrid. First, this paper analyzes the controlled object and extracts model information according to the state-space average method, and designs the 2nd-LADRC controller from the system level according to the state equation and transfer function. Then through frequency domain analysis, the convergence and anti-interference of 2nd-LADRC are verified, the relationship between the bandwidth of the observer and the anti-interference performance is discussed, and the system stability when the 2nd-LADRC controller is applied is analyzed using Lyapunov theory. It is concluded that the system is stable from the perspective of engineering application. Finally, a 40kW experimental prototype is designed to simulate the experimental scenarios of different control strategies when the microgrid and load power fluctuate. The experimental results verify the feasibility and effectiveness of the 2nd-LADRC control method.
陶珑, 王萍, 王议锋, 马小勇, 程鹏宇. 微电网负载端接口变换器的自抗扰稳压控制[J]. 电工技术学报, 2022, 37(8): 2076-2085.
Tao Long, Wang Ping, Wang Yifeng, Ma Xiaoyong, Cheng Pengyu. Voltage Stabilization Strategy for Load-Side Interface Converter of Microgrid Combined with Active Disturbance Rejection Control. Transactions of China Electrotechnical Society, 2022, 37(8): 2076-2085.
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