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14463
Evaluation of Power Factor Corrected AC - DC Converters and Controllers to meet UPS Performance Index
Abstract:
Harmonic pollution and low power factor in power systems caused by power converters have been of great concern. To overcome these problems several converter topologies using advanced semiconductor devices and control schemes have been proposed. This investigation is to identify a low cost, small size, efficient and reliable ac to dc converter to meet the input performance index of UPS. The performance of single phase and three phase ac to dc converter along with various control techniques are studied and compared. The half bridge converter topology with linear current control is identified as most suitable. It is simple, energy efficient because of single switch power loss and transformer-less operation of UPS. The results are validated practically using a prototype built using IGBT and analog controller. The performance for both single and three-phase system is verified. Digital implementation of closed loop control achieves higher reliability. Its cost largely depends on chosen bit precision. The minimal bit precision for optimum converter performance is identified as 16-bit with fixed-point operation. From the investigation and practical implementation it is concluded that half bridge ac – dc converter along with digital linear controller meets the performance index of UPS for single and three phase systems.
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References:

[1] Singh B, Singh BN, Chandra A, AL-Haddad A, Pandey A and Kothari DP, "A review of three phase improved power quality AC- DC converters", IEEE transactions on industrial electronics, Vol.51, No. 3, pp. 641-659, June 2004.
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[3] Gui-Jia Su, Donald J. Adems and Leon M. Tolbert, "Comparative study of power factor correction converters for single phase half-bridge inverters" IEEE IECON 2001, pp. 995-1000.
[4] Mohan, Underland, Robbins, "Power Electronics Converters, Applications and Design", John Wiley & Sons, 2004.
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