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为抑制电力系统中可控串联补偿装置的非线性及外部扰动影响,文中应用直接反馈线性化方法和滑模比例–积分–微分(proportional-integral-differential,PID)控制理论,设计了可控串联补偿的新型非线性控制器。利用直接反馈线性化方法对非线性模型精确线性化,采用滑模变结构理论与常规PID的复合控制策略,设计的可控串联补偿控制规律简洁,易于工程实现且鲁棒性好。仿真结果表明,与传统的控制方式相比,滑模PID控制器能有效地阻尼系统振荡,提高系统的暂态稳定性,对运行点变化也具有较好的适应性。
In order to suppress the nonlinear and external disturbances of the controllable series compensation device in the power system, a direct feedback linearization method and a sliding-mode proportional-integral-differential (PID) control theory are used to design a controllable series Compensation of the new nonlinear controller. The nonlinear model is linearized by the direct feedback linearization method. The compound control strategy of sliding mode variable structure theory and conventional PID is adopted. The control law of the controllable series compensation is simple, easy to implement and robust. The simulation results show that compared with the traditional control method, the sliding mode PID controller can effectively dampen the system oscillation, improve the transient stability of the system and also have good adaptability to the change of operating point.