Electrohydraulic proportional valve-controlled vane type semi-rotary actuated wind turbine control by feedforward fractional-order feedback controller

Abstract

In this study, proportional valve-controlled semi-rotary electrohydraulic actuator proposed for horizontal axis wind turbine pitch movement. Semi-rotary actuator can be connected directly to the wind turbine blade, which reduces mechanical complexity compare to linear electrohydraulic actuator system. Adaptive torque control scheme has been adopted for the horizontal axis wind turbine in region II; however, adaptive pitch control has been adopted for region III. Optimum pitch demand and torque demand have been estimated through blade element momentum theory based on predicted wind speed. The control objective is to track maximum power through torque control in region II and to maintain rated power with structural safety by limiting thrust force in the region III. The proposed wind turbine model has been validated with 1.5-MW wind turbine experimental data. Feedforward fractional-order proportional–integral–derivative controller with adaptive teaching–learning based optimization algorithm has been developed for wind turbine control application. In region II, feedforward control signal generates due to torque demand and feedback control signal generates due to combined torque and pitch error. However, in region III, feedforward and feedback control estimated with pitch demand and combined pitch and torque error, respectively. The proposed controller performance has been tested with sinusoidal, step and actual wind data. The controller performance also compared with respect to other conventional controllers. Performance of the adaptive teaching–learning-based optimization has been compared with genetic algorithm and teaching–learning-based optimization process. Sensitivity analysis has been performed with proposed controller to check the effectiveness of the optimization. Furthermore, the proposed controller response has been compared with existing data of 1.5-MW wind turbine. Lyapunov-based stability analysis has been performed to ensure stability and convergence of the proposed system. Proposed controller performance has been found better compare to the existing result.

Pitch control of electrohydraulic semi-rotary-actuated wind turbine with actuator and valve fault using generalized power-based exponential rate reaching law sliding mode controller

“…The lift force d F L and drag force d F D are experienced by the blade element due to wind flowing over it with velocity, V w . The resultant normal force d F N and the tangential force d F T can be obtained with relative wind angle, φ as follows 4,5…”

“…The pressure in Chamber 1, P A and the pressure in Chamber 2, P B of the SRA can be obtained by neglecting the hydraulic oil compressibility effect, 4,37 and with pump pressure P P and tank pressure P T , given as…”

“…The EH-PAS possesses additional nonlinearities due to the presence of control valve deadband, piston friction, and pressure-flow relation. 4,5…”

“…Various benchmark test signals and existing real wind data have been used for extensive performance analysis of ERL-SMC, ERRL-SMC, EERL-SMC, IERRL-SMC, and CPRRL-SMC and proposed GPERRL-SMC. Furthermore, the performance of the proposed GPERRL-SMC and recently proposed adaptive teaching–learning-based optimized feedforward fractional-order proportional–integral–derivative (ATLBO-FFOPID) controller 4 comparison has been studied.…”

Performance Analysis of Electro-Hydraulic Thrust System of TBM Based on Fuzzy PID Controller

“…Results showed that the compliance index of the new shield thrust system increased by 25% compared to that of existing one. Venkaiah et al [21] proposed a proportional valve-controlled semi-rotary electrohydraulic actuator for horizontal axis wind turbine pitch movement by feedforward fractional-order feedback controller. The proposed controller response has been compared with existing data of a 1.5 MW wind turbine.…”