NDLI: A PWM rectifier control technique for three-phase double conversion UPS under unbalanced load

Content Provider	IEEE Xplore Digital Library
Author	Dai, M. Marwali, M.N. Jin-Woo Jung Keyhani, A.
Copyright Year	2005
Description	Author affiliation: Dreese Lab., Ohio State Univ., Columbus, OH, USA (Dai, M.; Marwali, M.N.; Jin-Woo Jung; Keyhani, A.)
Abstract	PWM rectifiers are widely used in three-phase ac-dc-ac systems due to its capability in dc voltage boost and regulation, input power factor correction, and input current harmonic control. However, with the conventional rectifier control technique, the input current tends to be unbalanced under unbalanced inverter load, which contaminates input power source and is therefore undesirable. In this paper, the cause of the unbalancing is disclosed by evaluating the spectra of the switching functions of the full bridge three-phase inverter analytically using Bessel function under standard space vector PWM switching scheme, which relates the dc link current and voltage ripples to the inverter load balancing. The analysis shows that the dc link voltage contains significant second order harmonic component which affects the voltage loop of the rectifier controller, especially when the control gain is high. A notch filter based voltage control loop is proposed to eliminate the second harmonic component in the dc-link voltage feedback signal and achieve balanced three-phase input currents. Simulation and experimental results are presented to demonstrate the effectiveness of the proposed control technique in decoupling the rectifier and the inverter under unbalanced load.
Starting Page	548
Ending Page	552
File Size	860456
Page Count	5
File Format	PDF
ISBN	0780389751
DOI	10.1109/APEC.2005.1452995
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-03-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse width modulation Rectifiers Uninterruptible power systems Pulse width modulation inverters Voltage control Power harmonic filters Power factor correction Power system harmonics Control systems Bridge circuits
Content Type	Text
Resource Type	Article

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