Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
권호 표지
DOI QR코드

DOI QR Code

Improved Reactive Power Sharing and Harmonic Voltage Compensation in Islanded Microgrids Using Resistive-Capacitive Virtual Impedance

  • Pham, Minh-Duc (School of Electrical Engineering, University of Ulsan) ;
  • Lee, Hong-Hee (School of Electrical Engineering, University of Ulsan)
  • Received : 2019.07.25
  • Accepted : 2019.08.26
  • Published : 2019.11.20
Download PDF
⟨ Previous Next ⟩

Abstract

Due to the mismatched line impedance among distributed generation units (DGs) and uncontrolled harmonic current, the droop controller has a number of problems such as inaccurate reactive power sharing and voltage distortion at the point of common coupling (PCC). To solve these problems, this paper proposes a resistive-capacitive virtual impedance control method. The proposed control method modifies the DG output impedance at the fundamental and harmonic frequencies to compensate the mismatched line impedance among DGs and to regulate the harmonic current. Finally, reactive power sharing is accurately achieved, and the PCC voltage distortion is compensated. In addition, adaptively controlling the virtual impedance guarantees compensation performance in spite of load changes. The effectiveness of the proposed control method was verified by experimental results.

Keywords

References

  1. D. E. Olivares, A. Mehrizi-Sani, A. H. Etemadi, C. A. Canizares, R. Iravani, M. Kazerani, A. H. Hajimiragha, O. Gomis-Bellmunt, M. Saeedifard, R. Palma-Behnke, G. A. Jimenez-Estevez, and N. D. Hatziargyriou, "Trends in microgrid control," IEEE Trans. Smart Grid, Vol. 5, No. 4, pp. 1905-1919, Jul. 2014. https://doi.org/10.1109/TSG.2013.2295514
  2. Y. W. Li and C. N. Kao, “An accurate power control strategy for power-electronics-interfaced distributed generation units operating in a low-voltage multibus microgrid,” IEEE Trans. Power Electron., Vol. 24, No. 12, pp. 2977-2988, Dec. 2009. https://doi.org/10.1109/TPEL.2009.2022828
  3. H. Han, X. Hou, J. Yang, J. Wu, M. Su, and J. M. Guerrero, “Review of power sharing control strategies for islanding operation of AC microgrids,” IEEE Trans. Smart Grid, Vol. 7, No. 1, pp. 200-215, Jan. 2016. https://doi.org/10.1109/TSG.2015.2434849
  4. K. De Brabandere, B. Bolsens, J. Van den Keybus, A. Woyte, J. Driesen, and R. Belmans, “A Voltage and Frequency Droop Control Method for Parallel Inverters,” IEEE Trans. Power Electron., Vol. 22, No. 4, pp. 1107-1115, Jul. 2007. https://doi.org/10.1109/TPEL.2007.900456
  5. C. T. Lee, C. C. Chu, and P. T. Cheng, “A new droop control method for the autonomous operation of distributed energy resource interface converters,” IEEE Trans. Power Electron., Vol. 28, No. 4, pp. 1980-1993, Apr. 2013. https://doi.org/10.1109/TPEL.2012.2205944
  6. J. He, Y. W. Li, and F. Blaabjerg, “An enhanced islanding microgrid reactive power, imbalance power, and harmonic power sharing scheme,” IEEE Trans. Power Electron., Vol. 30, No. 6, pp. 3389-3401, Jun. 2015. https://doi.org/10.1109/TPEL.2014.2332998
  7. X. Wang, Y. W. Li, F. Blaabjerg, and P. C. Loh, “Virtual-impedance-based control for voltage-source and current-source converters,” IEEE Trans. Power Electron., Vol. 30, No. 12, pp. 7019-7037, Dec. 2015. https://doi.org/10.1109/TPEL.2014.2382565
  8. J. Liu, Y. Miura, H. Bevrani, and T. Ise, “Enhanced virtual synchronous generator control for parallel inverters in microgrids,” IEEE Trans. Smart Grid, Vol. 8, No. 5, pp. 2268-2277, Sep. 2017. https://doi.org/10.1109/TSG.2016.2521405
  9. H. Mahmood, D. Michaelson, and J. Jiang, “Accurate reactive power sharing in an islanded microgrid using adaptive virtual impedances,” IEEE Trans. Power Electron., Vol. 30, No. 3, pp. 1605-1617, Mar. 2015. https://doi.org/10.1109/TPEL.2014.2314721
  10. T.-L. Lee and P.-T. Cheng, “Design of a new cooperative harmonic filtering strategy for distributed generation interface converters in an islanding network,” IEEE Trans. Power Electron., Vol. 22, No. 5, pp. 1919-1927, Sep. 2007. https://doi.org/10.1109/TPEL.2007.904200
  11. M. Savaghebi, A. Jalilian, J. C. Vasquez, and J. M. Guerrero, "Selective compensation of voltage harmonics in an islanded microgrid," in 2nd Power Electronics, Drive Systems and Technologies Conference, pp. 279-285, 2011.
  12. P. Sreekumar and V. Khadkikar, “A new virtual harmonic impedance scheme for harmonic power sharing in an islanded microgrid,” IEEE Trans. Power Del., Vol. 31, No. 3, pp. 936-945, Jun. 2016. https://doi.org/10.1109/TPWRD.2015.2402434
  13. Q. C. Zhong and Y. Zeng, “Control of inverters via a virtual capacitor to achieve capacitive output impedance,” IEEE Trans. Power Electron., Vol. 29, No. 10, pp. 5568-5578, Oct. 2014. https://doi.org/10.1109/TPEL.2013.2294425
  14. B. Liu, Z. Liu, J. Liu, R. An, H. Zheng, and Y. Shi, “An adaptive virtual impedance control scheme based on small-AC-signal injection for unbalanced and harmonic power sharing in islanded microgrids,” IEEE Trans. Power Electron., Vol. 34, No. 12, pp. 12333-12355, Mar. 2019. https://doi.org/10.1109/TPEL.2019.2905588
  15. J. Roldan-Perez, A. Rodriguez-Cabero, and M. Prodanovic, “Harmonic virtual impedance design for parallel-connected grid-tied synchronverters,” IEEE J. Emerg. Sel. Top. Power Electron., Vol. 7, No. 1, pp. 493-503, Mar. 2019. https://doi.org/10.1109/JESTPE.2018.2828338
  16. Y. Han, H. Li, P. Shen, E. A. A. Coelho, and J. M. Guerrero, “Review of active and reactive power sharing strategies in hierarchical controlled microgrids,” IEEE Trans. Power Electron., Vol. 32, No. 3, pp. 2427-2451, Mar. 2017. https://doi.org/10.1109/TPEL.2016.2569597
  17. H. Fujita and H. Akagi, “A practical approach to harmonic compensation in power systems series connection of passive and active filters,” IEEE Trans. Ind. Appl., Vol. 27, No. 6, pp. 1020-1025, Nov. 1991. https://doi.org/10.1109/28.108451
  18. W. Wu, Y. Sun, M. Huang, X. Wang, H. Wang, F. Blaabjerg, M. Liserre, and H. S. H. Chung, "A robust passive damping method for LLCL-filter-based grid-tied inverters to minimize the effect of grid harmonic voltages," IEEE Trans. Power Electron., Vol. 29, No. 7, pp. 3279-3289, Jul. 2014. https://doi.org/10.1109/TPEL.2013.2279191