Digital-Controlled Single-Phase Unified Power Quality Conditioner for Non-linear and Voltage Sensitive Loads

  • Published : 2005.12.01

Abstract

The ability to provide quality power has become a significant issue in power systems. The main causes of poor power quality are harmonic currents, poor power factor, supply-voltage variations, etc. A technique of achieving both active current distortion compensation, power factor correction and also mitigating the supply-voltage variation (sag or swell) at the load side is presented in this paper. The operation and rating issues of the proposed Single-phase Unified Power Quality Conditioner are also highlighted. To reduce the total cost while simultaneously increasing the performance, the system is fully digitally controlled using the fixed-point TMS320F240 digital signal processor. The performances of the UPQC, which is composed by shunt and series PWM controlled-converters, have been verified on a laboratory prototype.

References

  1. Math H.J.Bollen, Understanding power quality problems, Voltage sags and interruptions, IEEE Press, ISBN 0-7803-44713-7, 2000
  2. T. Key and J.H. Lay, 'Comparison of Standard Limiting Harmonic Distortion in Power Systems,' IEEE Trans. on Ind. Appl., July/August 1993, pp. 683-695
  3. IEC 1000-3-2, First Edition 1995-03, Commision Electrotechnique Intemationale, 3 rue de Varembe, Geneve, Switzerland
  4. Jovanovic, D.E.Crow, 'Merits and Limitations of Full-Bridge Rectifier with LC Filter in Meeting IEC 1000-3-2 Harmonic-Limit Specifications,' in Proceedings of IEEE Applied Power Electronics Conference, March 1996, pp. 354-360 https://doi.org/10.1109/APEC.1996.500466
  5. S.D. Round and R.M. Duke, 'A controlled current inverter for active distortion compensation and power factor correction,' in Proceedings of ICECON'91 Conference, Nov. 1991, Kobe, Japan, pp. 735-740 https://doi.org/10.1109/IECON.1991.239196