水电能源科学

在含不确定扰动的水电站水机电网耦合系统中，合理的控制策略是提升调节性能与稳定性的关键。为研究水电站水机电网耦合系统不确定改进滑模控制，基于系统数学模型、滑模控制理论及输入-反馈线性化方法设计滑模控制器，提出不确定改进滑模控制器，并分析其作用机理与适用性。结果表明，常规输入-输出反馈线性化控制和滑模控制存在“假稳定现象”,而不确定改进滑模控制器不仅能消除此现象，相较于PID控制还具有超调量小、调节时间短的优势，可显著增强系统抗扰性，在不同参数与扰动场景下均表现出良好的调节性能和适用性。

In the hydraulics-machinery-electrics-grid coupling system of hydropower station with uncertain disturbance, a reasonable control strategy is crucial to improve the regulation performance and stability. This paper investigates the uncertain improved sliding mode control for such systems. Firstly, the sliding mode controller was designed based on the system mathematical model, sliding mode control theory and input-feedback linearization method. Then, the uncertain improved sliding mode controller was proposed, and its mechanism and applicability were analyzed. The results show that the conventional input-output feedback linearization control and sliding mode control have false stability, and the uncertain improved sliding mode controller can not only eliminate this phenomenon, but also has the advantages of small overshoot and short adjustment time compared with the PID control. It can significantly enhance the system's disturbance rejection, and shows good regulation performance and applicability in different parameters and disturbance scenarios.