基于动态级联自抗扰的交流微网直流母线稳压控制

为解决交流微网DC-AC变换器受到外界扰动影响而导致控制效果不佳以及直流母线电压振荡现象的问题，设计了一种动态级联自抗扰稳压控制策略。首先，在初始状态观测器的基础上引入了新的观测器，形成级联观测器线性自抗扰控制结构，并且设计动态调节因子对观测器增益参数进行在线优化调节。其次，在扰动观测器的基础上给出动态因子的优化整定范围，并根据跟踪性能和抗扰性能的频率特性曲线对系统的抗扰性和稳定性进行了理论分析，说明了观测参数与控制参数对系统综合性能的影响，并得到最优参数的整定范围。最后，在Matlab/Simulink仿真平台中搭建交流微网的数字仿真实验模型，并设计多种仿真工况，将所提控制策略与其他控制策略进行对比验证。证明了所设计的控制策略的正确性和优异性，说明了所提控制策略具备较好的电压振荡抑制能力，提高了电压稳定性。

Dynamic cascade active disturbance rejection-based DC bus stabilizing control for an AC microgrid

To address the problem of poor control effect and DC bus voltage oscillation phenomenon caused by the influence of external disturbances on the DC-AC converter of AC microgrids, a dynamic cascaded self-disturbance rejection voltage stabilization control strategy is designed. First, a new observer is introduced based on the initial state observer to form a cascaded observer linear self-disturbance rejection control structure, and a dynamic adjustment factor is designed to optimize and adjust the observer gain parameters online. Secondly, based on the disturbance observer, an optimized setting range for dynamic factors is provided, and theoretical analysis of the system’s anti-interference and stability is conducted based on the frequency characteristic curves of tracking performance and anti-interference performance. The influence of observation and control parameters on the overall performance of the system is explained, and the optimal parameter setting range is obtained. Finally, a digital simulation experimental model of the AC microgrid is built on the Matlab/Simulink simulation platform, and multiple simulation conditions are designed to compare and verify other control strategies with the proposed control strategy. The correctness and superiority of the designed control strategy are proved, and it is demonstrated that the proposed control strategy has good voltage oscillation suppression ability and improves voltage stability.