Research on Sliding Film Control Method for Anti-Drop Jitter of Power Grid Mechanical Terminals
Due to the complex structure of auto-compatible power grids,it is difficult for the mechanical terminal trajectory to slide strictly along the sliding mode surface toward the equilibrium point after arriving at the sliding mode surface,which leads to sudden voltage and power drops and generates jitter.In this regard,a sliding film control method for anti-drop jitter of power grid mechanical termials is proposed of the auto-compatible.A mathematical model of the mechanical terminal is constructed to analyze the causes of the drop jitter problem.The sliding film control method based on expansion observer is proposed,and the expansion observer is designed to obtain the internal disturbance information of the mechanical terminal system.The observation results are used as the current feed-forward compensation to optimize the disturbance immunity.Combined with the sliding film control method,a sliding film controller is designed,auto-compatible power grid mechanical terminal sliding film control is realized through the controller.The experimental results show that the method has a smooth dynamic fluctuation of current power mutation and a fast recovery to normal voltage after an 85％drop in grid voltage.The method mitigates the degree of drop jitter,effectively improves the dynamic response fluctuation stability,and promotes the development of the power distribution network.
Auto-compatible power gridMechanical terminal systemSliding film controlExpansion observerGlobal sliding mode
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