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A Single-Phase Unified Power Quality Conditioner with a Frequency-Adaptive Repetitive Controller

  • Phan, Dang-Minh ;
  • Lee, Hong-Hee
  • Received : 2017.07.25
  • Accepted : 2017.11.15
  • Published : 2018.03.01

Abstract

This paper proposes a single-phase unified power quality conditioner (S-UPQC) for maintaining power quality issues in a microgrid. The S-UPQC can compensate the voltage and current harmonics, voltage sag, and swell as a dynamic voltage restorer (DVR), regardless of variations in the grid frequency. Odd harmonics are treated as even-order harmonics in a rotating frame to implement the harmonic compensators with only one repetitive controller (RC) without any harmonic extractor. The dynamic performance is improved and the delay time is reduced in the RC. The S-UPQC control scheme is designed to maintain accurate and stable operation under deviations of the grid frequency by using the Lagrange interpolation-based finite-impulse-response (LIFIR) filter approximation method. The proposed control schemes were validated through a simulation and experiment.

Keywords

Power quality;Unified power quality conditioner (UPQC);Harmonic compensation;Repetitive controller (RC);Single-phase system

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Acknowledgement

Supported by : Korea Institute of Energy Technology Evaluation and Planning(KETEP), National Research Foundation of Korea