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On the State-dependent Switched Energy Functions of DFIG-based wind power generation systems

CSEE Journal of power and Energy systems 2020年第2期6卷 318-328页

作者： Yang Liu Zehui Lin Kaishun Xiahou Mengshi Li Q.H.Wu School of Electric power Engineering South China University of TechnologyGuangzhou 510640China

This paper proposes a novel state-dependent switched energy function(SdSEF)for general nonlinear autonomous systems,and constructs an SdSEF for doubly-fed induction generator(DFIG)-based wind power generation systems(WPGSs).Different from the conventional energy function,SdSEF is a piece-wise continuous function,and it satisfies the conditions of conventional energy functions on each of its continuous *** is designed to bridge the gap between the well-developed energy function theory and the description of system energy of complex nonlinear systems,such as power electronics converter *** stability criterion of nonlinear autonomous systems is investigated with SdSEF,and mathematical proof is *** SdSEF of a typical DFIGbased WPGS is simulated in the whole processes of a grid fault and fault *** results verify the negativeness of the derivative of each continuous segment of the SdSEF.

关键词： Doubly-fed induction generator state-dependent switched energy function wind power generation system

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Residue Theorem based soft sliding mode control for wind power generation systems

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Protection and Control of Modern power systems 2018年第1期3卷 256-267页

作者： Mohammed Alsumiri Liuying Li Lin Jiang Wenhu Tang University of Liverpool LiverpoolUK

This paper proposes a residue theorem based soft sliding mode control strategy for a permanent magnet synchronous generator(PMSG)based wind power generation system(WPGS),to achieve the maximum energy conversion and improved in the system dynamic *** main idea is to set a soft dynamic boundary for the controlled variables around a reference *** the controlled variables would lie on a point inside the *** convergence of the operating point is ensured by following the Forward Euler *** proposed control has been verified via simulation and experiments,compared with conventional sliding mode control(SMC)and proportional integral(PI)control.

关键词： Maximum power point tracking Sliding mode control Residue theorem wind power generation system Permanent magnet synchronous generator

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Variable Pitch Sliding Mode Control of wind Turbine Based on Disturbance Observer

Variable Pitch Sliding Mode Control of Wind Turbine Based on...

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第30届中国控制与决策会议

作者： Hao wan-jun Hao shi-yuan Jia yi-shi Chen xin-jing Cao song-qing Qiao yan-hui Li zhe College of Electronic and Information Engineering Suzhou University of Science and Technology Department of Electrical Engineering Technical University of Denmark College of Mechanical Engineering Suzhou University of Science and Technology

Due to the randomness of the wind speed, the time variability of the wind turbine’s parameters, the nonlinearity of the system and the time delay, the output power of the wind turbine is unstable. In order to improve the dynamic performance of the system in the constant power output operation area, based on the analysis of the research status of variable pitch control of wind power generation system, a sliding mode control scheme based on disturbance observer is proposed. This method not only has the robustness for sliding mode control parameters also has many advantages such as fast response. Adding the disturbance observer is effective to restrain the external disturbance of the system, ensuring the stability of the output power and the motor speed of the wind generator system under the condition of random wind speed disturbance. The results show that the variable pitch sliding mode controller based on disturbance observer has good dynamic performance and robustness to wind speed disturbance, which can effectively improve the pitch control effect of the system.

关键词： wind power generation system pitch angle control disturbance observer sliding mode control

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