In this paper,a novel robust fault-tolerant control scheme based on event-triggered communication mechanism for a variable-speed wind energy conversion system(WECS)with sensor and actuator failures is proposed.The non...In this paper,a novel robust fault-tolerant control scheme based on event-triggered communication mechanism for a variable-speed wind energy conversion system(WECS)with sensor and actuator failures is proposed.The nonlinear WECS with event-triggered mechanism is modeled based on the Takagi-Sugeno(T-S)fuzzy model.By Lyapunov stability theory,the parameter expression of the proposed robust fault-tolerant controller with event-triggered mechanisms is proposed based on a feasible solution of linear matrix inequalities.Compared with the existing WECS fault-tolerant control methods,the proposed scheme significantly reduces the pressure of network packet transmission and improves the robustness and reliability of the WECS.Considering a doubly-fed variable speed constant frequency wind turbine,the eventtriggered mechanism based fault-tolerant control for WECS is analyzed considering system model uncertainty.Numerical simulation results demonstrate that the proposed scheme is feasible and effective.展开更多
For the basic condition that the quality and efficiency of forestry cadres' education and training in China are not high at present, this paper first analyzes the necessity of constructing the management mechanism...For the basic condition that the quality and efficiency of forestry cadres' education and training in China are not high at present, this paper first analyzes the necessity of constructing the management mechanism for forestry cadres' education and training from two aspects: improve the quality of forestry cadres' education and training and the inherent needs of forestry development, and also summarizes the existing problems in the management of forestry cadres' education and training in China at present, and finally, this paper puts forward the corresponding solutions from four aspects: strengthen macro planning, strengthen the construction of the quality supervision mechanism, reform the incentive system and safeguard the mechanism.展开更多
基金supported by Ministry of Science and Technology of Peoples Republic of China(No.2019YFE0104800).
文摘In this paper,a novel robust fault-tolerant control scheme based on event-triggered communication mechanism for a variable-speed wind energy conversion system(WECS)with sensor and actuator failures is proposed.The nonlinear WECS with event-triggered mechanism is modeled based on the Takagi-Sugeno(T-S)fuzzy model.By Lyapunov stability theory,the parameter expression of the proposed robust fault-tolerant controller with event-triggered mechanisms is proposed based on a feasible solution of linear matrix inequalities.Compared with the existing WECS fault-tolerant control methods,the proposed scheme significantly reduces the pressure of network packet transmission and improves the robustness and reliability of the WECS.Considering a doubly-fed variable speed constant frequency wind turbine,the eventtriggered mechanism based fault-tolerant control for WECS is analyzed considering system model uncertainty.Numerical simulation results demonstrate that the proposed scheme is feasible and effective.
文摘For the basic condition that the quality and efficiency of forestry cadres' education and training in China are not high at present, this paper first analyzes the necessity of constructing the management mechanism for forestry cadres' education and training from two aspects: improve the quality of forestry cadres' education and training and the inherent needs of forestry development, and also summarizes the existing problems in the management of forestry cadres' education and training in China at present, and finally, this paper puts forward the corresponding solutions from four aspects: strengthen macro planning, strengthen the construction of the quality supervision mechanism, reform the incentive system and safeguard the mechanism.