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Three-phase four wire voltage controlled AC line conditioner with unity input power factor and minimised output voltage harmonics

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2 Author(s)
Y. -K. Lo ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; C. -L. Chen

The paper presents a new high performance AC line conditioner isolating any configuration of nonlinear loads for three-phase four wire applications. The proposed conditioner is composed of a switch mode rectifier (SMR) and a ROM based sinusoidal pulse width modulation (SPWM) inverter. The three-phase half bridge type SMR operates under voltage mode control. No current sensing is required. The inverter is also a half bridge type controlled by a ROM based SPWM modulator. Preoptimised SPWM control patterns rejecting the effects of DC link voltage ripples and dead times are programmed. Owing to the nature of the three-phase scheme, the voltage imbalance problem between the DC link capacitors can be lessened. High quality three-phase AC outputs can be obtained while nearly sinusoidal input currents are drawn

Published in:

IEE Proceedings - Electric Power Applications  (Volume:142 ,  Issue: 1 )