Abstract
The main contribution of this paper is the development of H∞ fault tolerant control for a wind energy conversion system (WECS) based on the stochastic piecewise affine (PWA) model. In this paper the normal and fault stochastic PWA models for WECS including multiple working points at different wind speeds are established. A reliable piecewise linear quadratic regulator state feedback is designed for the fault tolerant actuator and sensor. A sufficient condition for the existence of the passive fault tolerant controller is derived based on some linear matrix inequalities (LMIs). It is shown that the H∞ fault tolerant controller of WECS can control the wind turbine exposed to multiple simultaneous sensor faults or actuator faults; that is, the reliability of wind turbines can be improved.
Highlights
A wind energy conversion system is a mechanical electronic hydraulic integrated system which consists of rotor, drive train, gear box, generator and other mechanical equipment
In order to overcome the nonlinear characteristics of wind turbines, wind energy conversion system (WECS) is proposed in this paper based on a stochastic piecewise affine (PWA) model framework
A sufficient condition for the existence of the passive fault tolerant controller is derived based on some linear matrix inequalities (LMIs)
Summary
A wind energy conversion system is a mechanical electronic hydraulic integrated system which consists of rotor, drive train, gear box, generator and other mechanical equipment. The design of fault-tolerant control for wind turbine systems is still lacking in studies. In order to overcome the nonlinear characteristics of wind turbines, WECS is proposed in this paper based on a stochastic PWA model framework. In a controller for the piecewise recent paper [12], a new method was presented to synthesize the discrete time linear systems. The stochastic PWA normal, sensor fault and actuator fault models for WECS including multiple work regions are established. A sufficient condition for the existence of the passive fault tolerant controller is derived based on some LMIs. The paper is organized as follows: in Section 2, a dynamic model of WECS and the control strategy are briefly described.
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