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Performance Improvement of Grid-Connected Inverter Systems under Unbalanced and Distorted Grid Voltage by Using a PR Controller

  • Lee, Jong-Hyun ;
  • Jeong, Hae-Gwang ;
  • Lee, Kyo-Beum
  • Received : 2011.12.30
  • Accepted : 2012.06.01
  • Published : 2012.11.01

Abstract

This paper proposes a control method for grid-connected inverter systems under unbalanced and distorted grid voltage. The proposed method can reduce the power ripple caused by the unbalanced condition and compensate for the low-order harmonics of the output currents caused by the distortion of grid voltage. To reduce the power ripple, our method replaces the two conventional PI controllers with one PR controllers in the stationary frame. PR controllers can implement selective harmonic compensation without excessive computational requirements; the use of these controllers simplifies the method. Both the simulated and experimental results agree well with the theoretical analysis.

Keywords

Grid connected inverter;PI controller;PR (Proportional Resonant) controller;Unbalanced and distorted grid voltage

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Acknowledgement

Supported by : Korea Institute of Energy Technology Evaluation and Planning (KETEP)