Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Accurate power sharing and harmonic mitigation scheme for parallel operation of single-phase voltage source inverters

  • Pham, Minh-Duc (Department of Electrical Engineering, University of Ulsan) ;
  • Lee, Hong-Hee (Department of Electrical Engineering, University of Ulsan)
  • Received : 2020.08.30
  • Accepted : 2020.09.14
  • Published : 2021.01.20
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Abstract

Inaccurate reactive power sharing and voltage distortion at the point of common coupling (PCC) always exist in a parallel inverter system due to feeder impedance mismatches and nonlinear load disturbances. An enhanced inverter control scheme through an output impedance adjustment is proposed to address these issues. Inverter output impedance is regulated considering fundamental and harmonic frequencies, and accurate power sharing and improved PCC voltage quality are realized at the steady state. In addition, the compensation scheme is easily applied in multiple parallel inverters without any prior knowledge of the feeder impedance. Experimental results with three parallel inverters validate the feasibility of the proposed control scheme.

Keywords

Acknowledgement

This research was supported by Korea Electric Power Corporation (Grant number: R20XO02-33). This work was supported the NRF of Korea Grant under Grant NRF-2018R1D1A1A09081779.

References

  1. Axelrod, B., Berkovich, Y., Ioinovici, A.: Voltage-controlled DG-grid interfacing converters. In: Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03, 3(1), pp. 444-455 (2003)
  2. He, J., Li, Y.W., Guerrero, J.M., Blaabjerg, F., Vasquez, J.C.: An islanding Microgrid power sharing approach using enhanced virtual impedance control scheme. IEEE Trans. Power Electron. 28(11), 5272-5282 (2013) https://doi.org/10.1109/TPEL.2013.2243757
  3. Wang, C., Liang, B., He, J.: An enhanced power regulation and seamless operation mode transfer control through cooperative dual-interfacing converters. In: IEEE Transactions on Smart Grid (2018)
  4. Morstyn, T., Hredzak, B., Agelidis, V.G.: Control strategies for microgrids with distributed energy storage systems: an overview. IEEE Trans. Smart Grid 1, 1 (2016) https://doi.org/10.1109/TSG.2010.2048171
  5. Pham, M.D., Lee, H.H.: Resonance mitigation and harmonics compensation in islanded microgrids via virtual damping resistance and virtual shunt filter. In: IECON 2019-45th Annual Conference of the IEEE Industrial Electronics Society, 1, pp. 2475-2480 (2019)
  6. Bai, H., Wang, X., Blaabjerg, F.: A grid-voltage-sensorless resistive-active power filter with series LC-filter. IEEE Trans. Power Electron. 33(5), 4429-4440 (2018) https://doi.org/10.1109/tpel.2017.2717183
  7. Garcia Campanhol, L.B., Oliveira da Silva, S.A., Goedtel, A.: Application of shunt active power filter for harmonic reduction and reactive power compensation in three phase four-wire systems. IET Power Electron. 7(11), 2825-2836 (2014) https://doi.org/10.1049/iet-pel.2014.0027
  8. Pham, M.-D., Lee, H.-H.: An Enhanced Reactive Power Sharing and Secondary Voltage Restoration Control in Islanded Microgrid, pp. 519-527. Springer, Singapore (2018)
  9. Lee, T.L., Hu, S.H.: Discrete frequency-tuning active filter to suppress harmonic resonances of closed-loop distribution power systems. IEEE Trans. Power Electron. 26(1), 137-148 (2011) https://doi.org/10.1109/TPEL.2010.2052833
  10. Wang, X., Blaabjerg, F., Chen, Z.: Autonomous control of inverter-interfaced distributed generation units for harmonic current filtering and resonance damping in an islanded microgrid. IEEE Trans. Ind. Appl. (2014)
  11. Sreekumar, P., Khadkikar, V.: A new virtual harmonic impedance scheme for harmonic power sharing in an islanded microgrid. IEEE Trans. Power Deliv. 31(3), 936-945 (2016) https://doi.org/10.1109/TPWRD.2015.2402434
  12. Lee, T.-L., Cheng, P.-T.: Design of a new cooperative harmonic filtering strategy for distributed generation interface converters in an islanding network. IEEE Trans. Power Electron. 22(5), 1919-1927 (2007) https://doi.org/10.1109/TPEL.2007.904200
  13. Arricibita, D., Sanchis, P., Gonzalez, R., Marroyo, L.: Impedance emulation for voltage harmonic compensation in PWM stand-alone inverters. IEEE Trans. Energy Convers. (2017)
  14. He, J., Li, Y.W., Wang, R., Wang, C.: A measurement method to solve a problem of using dg interfacing converters for selective load harmonic filtering. IEEE Trans. Power Electron. (2016)
  15. Zhu, Y., Zhuo, F., Wang, F., Liu, B., Zhao, Y.: A wireless load sharing strategy for islanded microgrid based on feeder current sensing. IEEE Trans. Power Electron. 30(12), 6706-6719 (2015) https://doi.org/10.1109/TPEL.2014.2386851
  16. De Brabandere, K., Bolsens, B., Van den Keybus, J., Woyte, A., Driesen, J., Belmans, R.: A voltage and frequency droop control method for parallel inverters. IEEE Trans. Power Electron. 22(4), 1107-1115 (2007) https://doi.org/10.1109/TPEL.2007.900456
  17. Han, Y., Li, H., Shen, P., Coelho, E.A.A., Guerrero, J.M.: Review of active and reactive power sharing strategies in hierarchical controlled microgrids. IEEE Trans. Power Electron. 32(3), 2427-2451 (2017) https://doi.org/10.1109/TPEL.2016.2569597
  18. Micallef, A., Apap, M., Spiteri-Staines, C., Guerrero, J.M.: Mitigation of harmonics in grid-connected and islanded microgrids via virtual admittances and impedances. IEEE Trans. Smart Grid 8(2), 651-661 (2017) https://doi.org/10.1109/TSG.2015.2497409
  19. Zhang, P., Zhao, H., Cai, H., Shi, J., He, X.: Power decoupling strategy based on "virtual negative resistor" for inverters in low-voltage microgrids. IET Power Electron. (2016)
  20. He, J., Li, Y.W., Blaabjerg, F.: An enhanced islanding microgrid reactive power, imbalance power, and harmonic power sharing scheme. IEEE Trans. Power Electron. 30(6), 3389-3401 (2015) https://doi.org/10.1109/TPEL.2014.2332998
  21. IEC 61000-2-2: Electromagnetic compatibility (EMC)-Part 2-2: environment-compatibility levels for low-frequency conducted disturbances and signaling in public low-voltage power supply systems. IEC 61000-2-2 (2002)
  22. Rodriguez, P., Luna, A., Candela, I., Mujal, R., Teodorescu, R., Blaabjerg, F.: Multiresonant frequency-locked loop for grid synchronization of power converters under distorted grid conditions. IEEE Trans. Ind. Electron. 58(1), 127-138 (2011) https://doi.org/10.1109/TIE.2010.2042420
  23. Xin, Z., Wang, X., Qin, Z., Lu, M., Loh, P.C., Blaabjerg, F.: An improved second-order generalized integrator based quadrature signal generator. IEEE Trans. Power Electron. (2016)
  24. Chen, Y., Guerrero, J.M., Shuai, Z., Chen, Z., Zhou, L., Luo, A.: Fast reactive power sharing, circulating current and resonance suppression for parallel inverters using resistive-capacitive output impedance. IEEE Trans. Power Electron. 31(8), 5524-5537 (2016) https://doi.org/10.1109/TPEL.2015.2493103
  25. Ye, T., Dai, N.Y., Lam, C.S., Wong, M.C., Guerrero, J.M.: Analysis, design, and implementation of a quasi-proportional-resonant controller for a multifunctional capacitive-coupling grid-connected inverter. IEEE Trans. Ind. Appl. (2016)