A Switched Extremum Seeking Approach to Maximum Power Point Tracking in Photovoltaic Systems
نویسندگان
چکیده
40 Impact of Varying Environmental Conditions Simulate switched extremum seeking controller for 1000 W/m2 to 500 W/m2 step change in incident solar irradiation at 200 ms Lyapunov-Based Switching Scheme • Use stability proof by Krstic and Wang, Automatica, 2000. • Compute the average system: xa = 1/T ∫T x(τ)dτ • Linearize the averaged system about the extremum point: A = [dfa/dxa]eq • Show the Jacobian A is Hurwitz: Re[eig(A)] < 0 • Develop a Lyapunov function to track proximity to the extremum point • Use the Jacobian A to solve the following Lyapunov equation: PA + ATP = -Q, Q>0 • Pose a quadratic Lyapunov function: V(xa) = 1/2·xaPxa • Switched duty ratio controller for DC/DC converter • Perturbation amplitude decays exponentially
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