Title :
Dynamic modeling and control of TL power amplifier using controlled source
Author :
Wang, Jun ; Xu, Longxiang
Author_Institution :
Coll. of Mech. & Electr. Eng., Nanjing Univ. of Aeronaut. & Astronaut., Nanjing, China
Abstract :
The accurate closed-loop system model of Three-Level (TL) power amplifier for magnetic bearing was presented. The TL power amplifier was a nonlinear system and uncertain math model would affect the stability analysis of power amplifier. Based on the controlled source method, the nonlinear devices were replaced by controlled voltage source or controlled current source. The models of left half bridge and right half bridge were deduced. The four modes with TL control strategy were analyzed and the closed-loop system model of TL power amplifier was obtained. Simulation and experimental results were basically the same and confirmed the validity of the proposed model. The results show that the deduced model can better reflect the actual control characteristics of TL power amplifier.
Keywords :
closed loop systems; magnetic bearings; nonlinear control systems; power amplifiers; stability; controlled current source; controlled source method; controlled voltage source; dynamic modeling; left half bridge; magnetic bearing; nonlinear devices; nonlinear system; right half bridge; stability analysis; three-level power amplifier; uncertain math model; Bridge circuits; Circuit simulation; Coils; Current supplies; High power amplifiers; Magnetic levitation; Nonlinear systems; Power amplifiers; Power system modeling; Voltage control; Controlled source; Magnetic bearing; Modeling; Power amplifier;
Conference_Titel :
Control and Decision Conference, 2009. CCDC '09. Chinese
Conference_Location :
Guilin
Print_ISBN :
978-1-4244-2722-2
Electronic_ISBN :
978-1-4244-2723-9
DOI :
10.1109/CCDC.2009.5191840
