直流微电网双向AC/DC变换器鲁棒前馈控制策略研究

针对双向AC/DC功率变换器在直流微电网母线电压稳定性方面的问题,文中提出了一种结合LESO和滑模理论的前馈鲁棒控制策略。通过建立直流微电网三相AC/DC双向功率变换器的动态数学模型,架构了三阶线性扩张状态观测器,并将三阶LESO的观测值用于滑模控制器的设计。该控制策略能够在不需要额外电流传感器的情况下实现前馈控制,并确保系统具有良好的动态性能。该策略还能够有效降低滑模控制的实现难度,提高系统的鲁棒性。仿真分析验证了文中所提控制策略的有效性。

Research on Robust Feedforward Control Strategy of Bidirectional AC/DC Converter for DC Microgrid

In view of the problem that the two-way AC/DC power converter can effectively ensure the stability of the DC microgrid bus voltage, a feedforward robust control strategy composed of LESO and sliding mode theory is proposed. By establishing the dynamic mathematical model of DC microgrid three-phase AC/DC bidirectional power converter, the third-order linear extended state observer is designed, and the observation values of third-order LESO are used in the design of sliding mode controller. The control strategy can realize feedforward control without additional current sensor and ensure that the system has good dynamic performance. The strategy can effectively reduce the implementation difficulty of sliding mode control, and significantly improve the robustness of the system. Through simulation analysis, the effectiveness of the proposed control strategy is verified.