Unity Power Factor Control for Three-Phase Three-Level Rectifiers Without Current Sensors
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 43, NO. 5, SEPTEMBER/OCTOBER 2007
1341
Unity Power Factor Control for Three-Phase Three-Level Rectifiers Without Current Sensors
Bingsen Wang, Member, IEEE, Giri Venkataramanan, Member, IEEE, and Ashish Bendre, Member, IEEE
Abstract—Three-level rectifiers with reduced number of switches (such as the Vienna Rectifier) to improve the input power quality of rectifier systems have been receiving wide interest in the past years. In this paper, a new carrier-based pulsewidthmodulation control algorithm is proposed for such converters to eliminate the low-frequency harmonics in the line current while achieving unity power factor at the rectifier input terminals. The operating constraints of the Vienna Rectifier with the carrierbased modulation strategy are examined carefully, and the proposed control algorithm ensures that appropriate voltage/current directional constraints are met. A promising cost-reduction opportunity can be seen with the elimination of input current sensing to operate the Vienna Rectifier. The control algorithm is verified via Saber simulation and experimental results. Index Terms—Carrier-based pulsewidth modulation (PWM), phase-angle control, unity power factor, Vienna Rectifier.
I. I NTRODUCTION EW GENERATIONS of adjustable-speed drive and power supply producers are increasingly incorporating input power factor and waveform control to comply with the various regulatory standards [1]. From time to time, specific applications such as aerospace power require careful regulation of the power converter front-end line current harmonics to minimize undesired interaction among the equipment connected to the same utility grid. A slew of new topologies including the ones based on three-level power conversion have been proposed to realize high-quality input waveforms [2]–[6]. Among these, the topology proposed by Kolar in 1994, which is called the
Paper IPCSD-07-033, presented at the 2005 Industry Applications
1341
Unity Power Factor Control for Three-Phase Three-Level Rectifiers Without Current Sensors
Bingsen Wang, Member, IEEE, Giri Venkataramanan, Member, IEEE, and Ashish Bendre, Member, IEEE
Abstract—Three-level rectifiers with reduced number of switches (such as the Vienna Rectifier) to improve the input power quality of rectifier systems have been receiving wide interest in the past years. In this paper, a new carrier-based pulsewidthmodulation control algorithm is proposed for such converters to eliminate the low-frequency harmonics in the line current while achieving unity power factor at the rectifier input terminals. The operating constraints of the Vienna Rectifier with the carrierbased modulation strategy are examined carefully, and the proposed control algorithm ensures that appropriate voltage/current directional constraints are met. A promising cost-reduction opportunity can be seen with the elimination of input current sensing to operate the Vienna Rectifier. The control algorithm is verified via Saber simulation and experimental results. Index Terms—Carrier-based pulsewidth modulation (PWM), phase-angle control, unity power factor, Vienna Rectifier.
I. I NTRODUCTION EW GENERATIONS of adjustable-speed drive and power supply producers are increasingly incorporating input power factor and waveform control to comply with the various regulatory standards [1]. From time to time, specific applications such as aerospace power require careful regulation of the power converter front-end line current harmonics to minimize undesired interaction among the equipment connected to the same utility grid. A slew of new topologies including the ones based on three-level power conversion have been proposed to realize high-quality input waveforms [2]–[6]. Among these, the topology proposed by Kolar in 1994, which is called the
Paper IPCSD-07-033, presented at the 2005 Industry Applications