TY - GEN
T1 - High real output power on-line UPS system with built-in reactive power compensation
AU - Liang, T. J.
AU - Shyu, J. L.
AU - Chen, J. F.
PY - 2001/10/22
Y1 - 2001/10/22
N2 - A circuit topology is proposed for single-phase on-line UPS systems. The proposed circuit incorporates a built-in bidirectional converter which provides power factor correction and active power filtering. The input stage, based on a bidirectional full-bridge converter, functions as a rectifier with unity power factor correction for normal ac line mode operation, and as an active power filter for outage mode operation. During input power failure, the DC/AC inverter output stage supplies real power from the battery bank to the critical load. Simultaneously, the bidirectional AC/DC converter functions as an active power filter, providing reactive power to the load. Thus, the real power capability is improved compared to conventional on-line UPS. Simulation of the proposed topology shows, for normal mode, a well regulated sinusoidal output voltage with minimum harmonic distortion for nonlinear loads, near-unity power factor and low-harmonic current for ac line. For outage mode, simulation shows a sinusoidal output voltage with low total harmonic distortion and a near-unity output power factor with a high utilization factor. Simulation results confirm the feasibility and features of the proposed UPS scheme.
AB - A circuit topology is proposed for single-phase on-line UPS systems. The proposed circuit incorporates a built-in bidirectional converter which provides power factor correction and active power filtering. The input stage, based on a bidirectional full-bridge converter, functions as a rectifier with unity power factor correction for normal ac line mode operation, and as an active power filter for outage mode operation. During input power failure, the DC/AC inverter output stage supplies real power from the battery bank to the critical load. Simultaneously, the bidirectional AC/DC converter functions as an active power filter, providing reactive power to the load. Thus, the real power capability is improved compared to conventional on-line UPS. Simulation of the proposed topology shows, for normal mode, a well regulated sinusoidal output voltage with minimum harmonic distortion for nonlinear loads, near-unity power factor and low-harmonic current for ac line. For outage mode, simulation shows a sinusoidal output voltage with low total harmonic distortion and a near-unity output power factor with a high utilization factor. Simulation results confirm the feasibility and features of the proposed UPS scheme.
UR - http://www.scopus.com/inward/record.url?scp=0034795398&partnerID=8YFLogxK
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U2 - 10.1109/PESC.2001.954340
DO - 10.1109/PESC.2001.954340
M3 - Conference contribution
AN - SCOPUS:0034795398
SN - 0780370678
T3 - PESC Record - IEEE Annual Power Electronics Specialists Conference
SP - 1555
EP - 1560
BT - PESC Record - IEEE Annual Power Electronics Specialists Conference
T2 - 2001 IEEE 32nd Annual Power Electronics Specialists Conference
Y2 - 17 June 2001 through 21 June 2001
ER -