Robust Control Based On Hinf Loop- Shaping Of Variable-Speed Variable-Pitch Wind Turbine

Green renewable energy can not only meet the needs of social development, but also protect our homes and purify living environment. In recent years, the environmental pollution problems and economic benefits of fuel savings, also makes renewable energy, especially wind power generation system has attracted more and more attention. The usage of wind energy conversion system-WECS in power generation increased significantly over the past several decades Such energy for electricity production has no pollution and no emission. However, the wind power development still has many unsolved challenges, and research on control system also has many problems. The system control strategy determines the energy capture and output characteristic of WECS. Because the uncertainty and aerodynamic delay, multivariable characteristics of the wind turbine model, the design of the controller has become the key of the variable-pitch wind turbine-WT safely and reliably operating.This paper makes a detailed analysis in the operation principle and energy conversion characteristics of variable-speed variable-pitch asynchronous doubly fed wind turbines, and provides corresponding control strategies. The design goals of the system is, below the rated wind speed, to capture of wind power as much as possible and output maximum power; above the rated wind speed, to maintain the rated power output, the Hinf loop shaping design method is applied to the controller design. Based on Hinf robust control theory, this paper uses the concept of loop shaping, and the weighting function regulating the singular value curve to enhance the dynamic stability, designs a robust Hinf loop shaping controller of variable-pitch wind power system. Classic PID controller for the system is designed at the same time, using Simulink to simulate the two controller. Comparing the results with the PID controller, the proposed controller perform better, the simulation results verifies the accuracy and the validity of the controller, so that wind power svstem more stable.