基于改进自耦比例积分的直流微电网母线电压控制

针对直流微电网中分布式电源出力不稳定、参数摄动以及负载波动等问题，本文以三相AC/DC换流器为主体，提出了一种具有强抗扰能力的改进自耦PI母线电压跟踪控制方法。首先将直流微电网内部动态和外部扰动的不确定性定义为一个总和扰动，从而使非线性不确定系统映射为未知线性系统；其次，构建了一个在总和扰动反相激励下的受控误差系统，据此设计了基于改进自适应速度因子的自耦PI控制器模型，有效抑制了母线电压波动，提高了系统的动态响应速度；最后，理论分析了自耦PI闭环控制系统的鲁棒稳定性和抗扰鲁棒性，并搭建了仿真模型进行验证。针对不同工况下直流母线电压跟踪的仿真结果表明，本文控制方法响应速度快，抗扰能力强，对于直流母线电压波动具有良好的稳定效果。

DC microgrid bus voltage control based on improved auto-coupling proportional-integral

Considering the problems of distributed power output instability, parameter perturbation and load fluctuations in direct current (DC) microgrids, an improved auto-coupling proportional-integral (ACPI) bus voltage tracking control method with strong anti-interference ability based on a three-phase AC/DC converter is proposed. Firstly, the uncertainty of the internal dynamics and external disturbances of the DC microgrid is defined as a total disturbance, and thus the nonlinear uncertain system is mapped to an unknown linear system. Secondly, a controlled error system under the inverse excitation of the total disturbance is constructed. Based on that, an ACPI controller model based on the improved adaptive speed factor is designed, and it effectively suppresses bus voltage fluctuations and improves the dynamic response speed of the system. Finally, the robust stability and anti-disturbance robustness of the ACPI closed-loop control system are theoretically analyzed, and a simulation model is built for verification. The simulation results of DC bus voltage tracking under different working conditions show that the proposed control method has a fast response speed, strong anti-interference ability for improing stability on DC bus voltage fluctuations.