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

  • Lee, Jong-Hyun (Department of Electrical and Computer Engineering, Ajou University) ;
  • Jeong, Hae-Gwang (Department of Electrical and Computer Engineering, Ajou University) ;
  • Lee, Kyo-Beum (Department of Electrical and Computer Engineering, Ajou University)
  • Received : 2011.12.30
  • Accepted : 2012.06.01
  • Published : 2012.11.01


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.


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


  1. R. J. Wai, W. H. Wang, and C. Y. Lin, "High-performance Stand-Alone Photovoltaic Generation System", IEEE Transactions on Industrial Electronics, vol. 55, no. 1, pp. 240-250, Jan. 2008.
  2. S. R. Bull, "Renewable Energy Today and Tomorrow", in Proceedings of the IEEE, vol. 89, no. 8, pp. 1216- 1226, Aug. 2001.
  3. S. Rahman, "Green Power" What Is It and Where Can We Find It?", IEEE Power and Energy Magazine, vol. 1, no. 1, pp. 30-37, Jan/Feb. 2003.
  4. S. -K. Chung, "Phase-locked loop for grid-connected three-phase power conversion system", in Proceedings of the IEE Electric Power Applications, vol. 147, no. 3, pp. 213-219, May. 2000.
  5. S. Alepuz, S. Busquets-Monge, J. Bordonau, J. Gago, D. Gonzalez, and J. Balcells, " Interfacing Renewable Energy Sources to the Utility Grid Using a Three- Level Inverter", IEEE Transactions on Industrial Electronics, vol. 53, no. 5, pp. 1504-1511, Oct. 2006.
  6. J. J. Negroni, C. Meza, D. Biel, and F. Guinjoan, "Control of a Buck Inverter for Grid-Connected PV Systems: a Digital and Sliding Mode control Approach", in Proceedings of the IEEE International Symposium on Industrial Electronics, pp. 739-744. Jun. 2005.
  7. G. Shen, X. Zhu, J. Zhang, and D. Xu, "A New feedback Method for PR Current Control of LCLfilter- Based Grid-Connected Inverter", IEEE Transactions on Industrial Electronics, vol. 57, no. 6, pp. 2033-2041, Jun. 2010.
  8. R. Teodorescu, F. Blaabjerg, M. Liserre, and P. C. Loh, "Proportional-resonant controllers and filters for grid-connected voltage-source converters", in Proceedings of the IEE Electric Power Applications, vol. 153, no. 5, pp. 750-762, Sept. 2006.
  9. P. C. Tan, P. C. Loh, and D. G. Holmes, "High performance harmonic extraction algorithm for a 25kV traction power quality conditioner", in Proceedings of the IEE Electric Power Applications, vol. 151, no. 5, pp. 505-512, Sept. 2004.
  10. D. N. Zmood and D. G. Holmes, "Stationary Frame current Regulation of PWM Inverter with Zero Steady-State Error", IEEE Transactions on Power Electronics, vol. 18, no. 3, pp. 814-822, May. 2003.
  11. G. Xiaoqiang, Z. Qinglin, and W. Weiyang, "A Single-Phase Grid-Connected Inverter System with Zero Steady-State Error", in Proceedings of the IEEE Power Electronics and Motion Control Conference, vol. 1, pp. 1-5, Aug. 2006.
  12. S. Fukuda, and T. Yoda, "A Novel Current-tracking Method for Active Filters Based on a sinusoidal internal Model", IEEE Transactions on Industry Applications, vol. 37, no. 3, pp. 888-895, May/Jun. 2001.
  13. M. Liserre, R. Teodorescu, and F. Blaabjerg, "Stability of Photovoltaic and Wind Turbine Gridconnected Inverters for a Large Set of Grid impedance Values", IEEE Transactions on Power Electronics, vol. 21, no. 1, pp. 263-272, Jan. 2006.
  14. J. I. Jang, and D. C. Lee, "High Performance Control of Three-Phase PWM Converters under non-ideal Source Voltage", in Proceedings of the IEEE International Conference on Industrial Technology, pp. 2791-2796, Dec. 2006.

Cited by

  1. Parameter Design and Power Flow Control of Energy Recovery Power Accumulator Battery Pack Testing System vol.8, pp.4, 2013,
  2. Resonant Current Controller With Enhanced Transient Response for Grid-Tied Inverters vol.65, pp.4, 2018,
  3. An Observer-Based Optimal Voltage Control Scheme for Three-Phase UPS Systems vol.62, pp.4, 2015,
  4. Design and Stability Analysis of a Fuzzy Adaptive SMC System for Three-Phase UPS Inverter vol.14, pp.4, 2014,
  5. Analysis and Design of Grid-Connected Photovoltaic Systems With Multiple-Integrated Converters and a Pseudo-DC-Link Inverter vol.61, pp.7, 2014,
  6. Small-Signal Modeling of the PVR-Based AD Scheme and Controller Design for Three-Phase Standalone DG System vol.11, pp.5, 2016,
  7. A 2ndOrder Harmonic Compensation Method for Wind Power System Using a PR Controller vol.8, pp.3, 2013,
  8. IDA-PBC controller design for grid connected Front End Converters under non-ideal grid conditions vol.142, 2017,
  9. Output Current Ripple Reduction Algorithms for Home Energy Storage Systems vol.6, pp.12, 2013,