Title :
Application of adaptive LQR with repetitive control for UPS systems
Author :
Shabaani, Karam ; Jalili-Kharaajoo, Mahdi
Author_Institution :
Dept. of ECE, Tehran Univ., Iran
Abstract :
In this paper an adaptive linear quadratic controller (LQR) with a repetitive controller (RP) for uninterruptible power supplies (UPS) is proposed. The gain of the controller is determined by minimizing a cost function, which reduces the tracking error and smoothes the control signal. A recursive least square (RLS) estimator is used to identify the plant parameters at different load conditions. A RP controller with forgetting coefficients is used for cyclic disturbances attenuation and the final control action is the sum of the LQR and RP controllers. Simulation results show the effectiveness of the proposed controller in producing an output signal with low total harmonic distortion.
Keywords :
adaptive control; harmonic distortion; linear quadratic control; recursive estimation; uninterruptible power supplies; RLS estimator; UPS systems; adaptive LQR; adaptive control; controller gain; cost function minimization; cyclic disturbance attenuation; final control action; forgetting coefficients; linear quadratic controller; plant parameters identification; recursive least squares; repetitive control; total harmonic distortion; uninterruptible power supplies; Adaptive control; Attenuation; Control systems; Cost function; Error correction; Least squares approximation; Programmable control; Recursive estimation; Resonance light scattering; Uninterruptible power systems;
Conference_Titel :
Control Applications, 2003. CCA 2003. Proceedings of 2003 IEEE Conference on
Print_ISBN :
0-7803-7729-X
DOI :
10.1109/CCA.2003.1223168
