Gu Yajing

TL;DR: In this article, a novel fuzzy integral sliding mode current control strategy is proposed to extract the maximum wind power and eliminate the high-order voltage harmonics at the generator side for a direct-driven wind energy system.

TL;DR: In this paper, a novel pitch angle control system is proposed to smooth output power and drive-train torque fluctuations for wind turbine, which is characterized by an outer open control loop for enhancing the direct pitching motion and an intrinsic hydro-mechanical position control loop offering the benefit of sensorless pitch control.

TL;DR: In this paper, a sliding mode voltage control strategy is proposed to capture the maximum electrical energy from wind, which mainly includes a fuzzy logic controller and a sliding-mode voltage controller, and significant performance improvements in maximum wind energy capture can be achieved by using the proposed control strategy.

Abstract: 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.

TL;DR: 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.