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Analysis and experimental verification of a control scheme for unified power quality conditioner

Author

Listed:
  • Peng-Cheng Zhu
  • Xun Li
  • Yong Kang
  • Jian Chen

Abstract

Improving power quality for sensitive load by a Unified Power Quality Conditioner (UPQC) in a distributed generation system is presented in this paper. The power balance of a UPQC, consisting of back-to-back connected series and shunt Active Filters (AF), is analysed. Based on the analysis a novel control scheme is established in a 2-phase Synchronous Rotating d-q Frame (SRF). In this control scheme, the series AF is controlled as a current source and makes the input current sinusoidal, while the shunt AF is controlled as a voltage source and keeps the load voltage in the normal value. With the proposed control strategy, the UPQC is capable of compensating not only harmonic and reactive currents of the load but also grid voltage distortion. There is no harmonic interference between harmonic-producing loads and harmonic-sensitive loads, which are connected on the common bus. The performance of a UPQC with the proposed control scheme under nonlinear load and grid voltage distortion is investigated with simulation as well as experimental works.

Suggested Citation

  • Peng-Cheng Zhu & Xun Li & Yong Kang & Jian Chen, 2005. "Analysis and experimental verification of a control scheme for unified power quality conditioner," International Journal of Energy Technology and Policy, Inderscience Enterprises Ltd, vol. 3(3), pages 253-268.
    • Handle: RePEc:ids:ijetpo:v:3:y:2005:i:3:p:253-268
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