DocumentCode :
2619356
Title :
An adaptive linear quadratic regulator with repetitive controller applied to uninterruptible power supplies
Author :
Montagner, Vinícius Foletto ; Carati, Emerson Giovani ; Gründling, Hilton Abilio
Author_Institution :
Univ. Federal de Santa Maria, Brazil
Volume :
4
fYear :
2000
fDate :
36800
Firstpage :
2231
Abstract :
This paper proposes a discrete time adaptive linear quadratic regulator (LQR) with a repetitive controller (RP) for uninterruptible power supplies (UPS). In the controller design, the gains are determined by minimizing a cost function which reduces the tracking error and the control signal. A recursive least squares (RLS) estimator identifies the plant parameters at different load conditions. Then, the LQR gains are adapted periodically. The output voltage is the only state variable measured in this scheme. The other state variables are obtained by filtering. It was verified through simulation and experimental results that the proposed strategy has good performance to linear and nonlinear loads providing fast transient response and accurate tracking with a low control effort even at low switching frequency
Keywords :
adaptive control; control system analysis; control system synthesis; discrete time systems; linear quadratic control; recursive estimation; transient response; uninterruptible power supplies; voltage control; UPS; control performance; control signal; control simulation; controller design; cost function; discrete time adaptive linear quadratic regulator; gain adaptation; load conditions; loads; plant parameters; recursive least squares estimator; repetitive controller; switching frequency; tracking error; transient response; uninterruptible power supplies; Adaptive control; Cost function; Error correction; Least squares approximation; Programmable control; Recursive estimation; Regulators; Resonance light scattering; Signal design; Uninterruptible power systems;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industry Applications Conference, 2000. Conference Record of the 2000 IEEE
Conference_Location :
Rome
ISSN :
0197-2618
Print_ISBN :
0-7803-6401-5
Type :
conf
DOI :
10.1109/IAS.2000.883135
Filename :
883135
Link To Document :
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