Ya-jing Gu
Zhejiang University
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Publication
Featured researches published by Ya-jing Gu.
Isa Transactions | 2015
Xiu-xing Yin; Yonggang Lin; Wei Li; Hongwei Liu; Ya-jing Gu
A variable-displacement pump controlled pitch system is proposed to mitigate generator power and flap-wise load fluctuations for wind turbines. The pitch system mainly consists of a variable-displacement hydraulic pump, a fixed-displacement hydraulic motor and a gear set. The hydraulic motor can be accurately regulated by controlling the pump displacement and fluid flows to change the pitch angle through the gear set. The detailed mathematical representation and dynamic characteristics of the proposed pitch system are thoroughly analyzed. An adaptive sliding mode pump displacement controller and a back-stepping stroke piston controller are designed for the proposed pitch system such that the resulting pitch angle tracks its desired value regardless of external disturbances and uncertainties. The effectiveness and control efficiency of the proposed pitch system and controllers have been verified by using realistic dataset of a 750 kW research wind turbine.
Journal of Renewable and Sustainable Energy | 2014
Xiu-xing Yin; Yonggang Lin; Wei Li; Ya-jing Gu
A novel pitch control system is proposed for wind turbine to smooth output power and load fluctuations. This system is driven by a servo-valve controlled hydraulic motor and is precisely controlled to track the desired pitch angle trajectory. Nonlinear modeling and characteristics of this system are presented and analyzed. An adaptive nonlinear sliding mode pitch angle controller is designed to deal with the uncertainties and external disturbances in this system. An integrated pitch control strategy is proposed to generate the reference pitch commands for this system by considering the load reductions. The proposed system, pitch controller, and the control strategy have been validated for efficient and accurate pitch control performances by comparative experimental results under realistic wind speeds.
International Journal of Control | 2015
Xiu-xing Yin; Yonggang Lin; Wei Li; Ya-jing Gu; Peng-fei Lei; Hongwei Liu
A new electro-hydraulic pitch system is proposed to smooth the output power and drive-train torque fluctuations for wind turbine. This new pitch system employs a servo-valve-controlled hydraulic motor to enhance pitch control performances. This pitch system is represented by a state-space model with parametric uncertainties and nonlinearities. An adaptive back-stepping pitch angle controller is synthesised based on this state-space model to accurately achieve the desired pitch angle control regardless of such uncertainties and nonlinearities. This pitch angle controller includes a back-stepping procedure and an adaption law to deal with such uncertainties and nonlinearities and hence to improve the final pitch control performances. The proposed pitch system and the designed pitch angle controller have been validated for achievable and efficient power and torque regulation performances by comparative experimental results under various operating conditions.
IEEE Transactions on Energy Conversion | 2015
Xiu-xing Yin; Yonggang Lin; Wei Li; Hongwei Liu; Ya-jing Gu
A fuzzy-logic sliding-mode control strategy is proposed to capture the maximum wind energy and reduce the generator-side current harmonics for a direct-driven wind power system. The control strategy mainly consists of a fuzzy logic controller for generating the optimum dc-side current and a double integral sliding-mode current controller capable of accurately tracking the optimum dc-side current. A resonant filter is also incorporated into the fuzzy logic controller to eliminate the generator-side current harmonics. Detailed design procedure, existence, and stability conditions of the proposed control strategy have been thoroughly investigated and presented. The capability and effectiveness of the proposed control strategy have been validated by comparative experimental results.
International Journal of Electrical Power & Energy Systems | 2015
Xiu-xing Yin; Yonggang Lin; Wei Li; Ya-jing Gu; Peng-fei Lei; Hongwei Liu
Energy | 2015
Xiu-xing Yin; Yonggang Lin; Wei Li; Ya-jing Gu; Hongwei Liu; Peng-fei Lei
Renewable Energy | 2015
Xiu-xing Yin; Yonggang Lin; Wei Li; Ya-jing Gu; Xiao-jun Wang; Peng-fei Lei
Renewable Energy | 2014
Xiu-xing Yin; Yonggang Lin; Wei Li; Hongwei Liu; Ya-jing Gu
Energy | 2015
Ya-jing Gu; Xiu-xing Yin; Hongwei Liu; Wei Li; Yonggang Lin
Renewable Energy | 2015
Xiu-xing Yin; Yonggang Lin; Wei Li; Hang-ye Ye; Ya-jing Gu; Hongwei Liu