Continuous-Time Feedback Control With Finite-Time Boundedness and H_∞ Performance Criteria

For advanced control applications, research into the use of linear matrix inequalities has yielded a notable amount of work in the area of nonlinear systems. Linear Matrix Inequalities can be formed through the application of desired performance criteria to a general system. By proper selection of a Lyapunov energy function, sufficient conditions to satisfy the performance objectives can be realized. The performance criteria, typically chosen for the application, define the objectives associated with the control. This work presents a control method for discrete-time systems with finite-time boundedness and H_∞ performance criteria. The design of the controller corresponds to a system existing with bounded model uncertainties, and in the presence of L₂ type external disturbances. Through the use of a linear state feedback control, sufficient conditions which guarantee the finite-time stability and H_∞ performance objectives are achieved via the solution of a Linear Matrix Inequality. MATLAB application and simulation is carried out using the field oriented control of a permanent magnet synchronous generator in order to effectively demonstrate the effectiveness of this control strategy in the wind energy conversion system application.