Title :
Output Voltage Control of A Four-Leg Inverter Based Three-Phase UPS by Means of Stationary Frame Resonant Filter Banks
Author :
Demirkutlu, Eyyup ; Cetinkaya, S. ; Hava, Ahmet M.
Author_Institution :
Middle East Tech. Univ., Ankara
Abstract :
A method for high performance output voltage control of a four-leg inverter (FLI) based three-phase UPS is proposed. Stationary frame resonant filter bank based output voltage control loop, which is complemented by capacitor current feedback based active damping loop, is employed. Utilizing the zero-state partitioning variable, a generalized form of scalar PWM for the FLI is developed and the minimum loss discontinuous PWM method is derived. The controller and modulator design and implementation details for the FLI-UPS are given. Linear and nonlinear loads for balanced and unbalanced load operating conditions are considered. The scalar control and PWM methods are proven by means of theory, simulations, and experiments.
Keywords :
feedback; invertors; power capacitors; power filters; pulse width modulation; uninterruptible power supplies; voltage control; PWM methods; active damping loop; balanced load operating condition; capacitor current feedback; controller design; four-leg inverter based three-phase UPS; linear load; modulator design; nonlinear load; output voltage control loop; scalar control; stationary frame resonant filter banks; unbalanced load operating condition; zero-state partitioning variable; Capacitors; Damping; Feedback loop; Filter bank; Output feedback; Pulse width modulation; Pulse width modulation inverters; Resonance; Uninterruptible power systems; Voltage control; Four-leg; THD; UPS; active damping; crest factor; efficiency; harmonic; inverter; resonant filter; scalar PWM; switching loss; unbalance; voltage regulation; zero-sequence; zero-state partitioning;
Conference_Titel :
Electric Machines & Drives Conference, 2007. IEMDC '07. IEEE International
Conference_Location :
Antalya
Print_ISBN :
1-4244-0742-7
Electronic_ISBN :
1-4244-0743-5
DOI :
10.1109/IEMDC.2007.382785
