Abstract: In this study an adaptive linear quadratic regulator for Uninterruptible Power Supplies (UPS) is proposed. In the controller design, the gains are determined by minimizing a cost function, which reduces the traching error and smoothes the control signal. A recursive least square estimator identifies the parameters model at different load conditions. Then the linear quadratic controller gains are adapted periodically. The output voltage is the only state variable measured.The other state variables are obtained by filtering. Simulation results show that the proposed strategy offers good performances for either linear and non-linear loads with low Total Harmonic Distortions (THD) even at low frequencies making it very useful for high power applications.
Rabhi Boualaga , Benaissa Amar , Moussi Ammar and M.A. Ayad , 2007. Application of Linear Quadratic Regulator for UPS Systems. Asian Journal of Information Technology, 6: 21-26.