Title :
Resonant link bidirectional power converter without electrolytic capacitor
Author :
Choi, Jong Woo ; Sul, Seung Ki
Author_Institution :
Dept. of Electr. Eng., Seoul Nat. Univ., South Korea
Abstract :
A power converter that consists of two identical three-phase pulse-width modulation (PWM) modulators and a novel resonant circuit is presented. The zero-switching-loss PWM power converter and the resonant circuit are presented. The resonant circuit is capable of PWM operation with minimum DC bus voltage stresses and minimum peak resonant current. The new control strategy is integrated to realize a bidirectional power converter without an electrolytic link capacitor. The power flow between converters is bidirectional, and regenerative braking is inherent. The source side currents maintain sinusoidal waveforms with unity power factor. It was observed in the experiment that the resonant circuit guarantees the soft switching of the converter power devices. In addition, by balancing the active power between the source and load side, the voltage across a small ceramic link capacitor can be maintained within a small deviation from the reference. Simulation results and experimental results are presented to verify the operational principles
Keywords :
AC-AC power convertors; PWM power convertors; electric current control; load flow; power factor; regenerative braking; resonant power convertors; switching circuits; voltage control; DC bus voltage stresses; active power; bidirectional power converter; ceramic link capacitor; control strategy; peak resonant current; power flow; regenerative braking; resonant link; soft switching; source side currents; three-phase PWM modulators; unity power factor; voltage regulation; zero-switching-loss; Capacitors; Load flow; Pulse circuits; Pulse width modulation; Pulse width modulation converters; RLC circuits; Reactive power; Resonance; Stress; Voltage;
Conference_Titel :
Power Electronics Specialists Conference, 1993. PESC '93 Record., 24th Annual IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-1243-0
DOI :
10.1109/PESC.1993.471914