The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

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

DOI QR Code

A Novel Digital Lock-In Amplifier Based Harmonics Compensation Method for the Grid Connected Inverter Systems

계통연계 인버터를 위한 디지털 록인 앰프 기반의 새로운 고조파 보상법

  • Received : 2019.10.28
  • Accepted : 2020.01.22
  • Published : 2020.10.20
Download PDF
⟨ Previous Next ⟩

Abstract

Grid-connected inverters (GCIs) based on renewable energy sources play an important role in enhancing the sustainability of a society. Harmonic standards, such as IEEE 519 and P1547, which require the total harmonic distortion (THD) of the output current to be less than 5%, should be satisfied when GCIs are connected to a grid. However, achieving a current THD of less than 5% is difficult for GCIs with an output filter under a distorted grid condition. In this study, a novel harmonic compensation method that uses a digital lock-in amplifier (DLA) is proposed to eliminate harmonics effectively at the output of GCIs. Accurate information regarding harmonics can be obtained due to the outstanding performance of DLA, and such information is used to eliminate harmonics with a simple proportional-integral controller in a feedforward manner. The validity of the proposed method is verified through experiments with a 5 kW single-phase GCI connected to a real grid.

Keywords

References

  1. B. K. Bose, "Global warming: Energy, environmental pollution, and the impact of power electronics," IEEE Industrial Electronics Magazine, Vol. 4, No. 1, pp. 6-17, Mar. 2010. https://doi.org/10.1109/MIE.2010.935860
  2. R. Teodorescu, F. Blaabjerg, M. Liserre, and P. C. Loh, "Proportional resonant controllers and filters for grid-connected voltage-source converters," in Proc. Inst. Elect. Eng.-Electr. Power Appl., Vol. 153, No. 5, pp. 750-762, Sep. 2006. https://doi.org/10.1049/ip-epa:20060008
  3. G. Shen, X. Zhu, J. Zhang, and D. Xu, "A new feedback method for PR current control of LCL-filter based grid-connected inverter," IEEE Trans. Ind. Electron., Vol. 57, No. 6, pp. 2033-2041, Jun. 2010. https://doi.org/10.1109/TIE.2010.2040552
  4. M. Liserre, F. Blaabjerg, and S. Hansen, ''Design and control of an LCL-filter-based three-phase active rectifier,'' IEEE Trans. Ind. Appl., Vol. 41, No. 5, pp. 1281-1291, Sep./Oct. 2005. https://doi.org/10.1109/TIA.2005.853373
  5. M. Lisrerre, R. Teodorescu, and F. Blaabjerg, "Multiple harmonic control for three phase grid converter system with the use of PI-RES current controller in rotating frame," IEEE Trans. Power Electronics, Vol. 21, No. 3, May 2006.
  6. N. R. Zargari and G. Joos, "Performance investigation of a current-controlled voltage-regulated PWM rectifier in rotating and stationary frames," IEEE Transactions on Industrial Electronics, Vol. 42, No. 4, pp. 396-401, Aug. 1995. https://doi.org/10.1109/41.402479
  7. X. Liang and C. Andalib-Bin-Karim, "Harmonics and mitigation techniques through advanced control in grid-connected renewable energy sources: A review," IEEE Transactions on Industry Applications, Vol. 54, No. 4, pp. 3100-3111, Jul./Aug. 2018. https://doi.org/10.1109/TIA.2018.2823680
  8. IEEE, "IEEE draft standard for microwave filter definitions-Corrigendum 1," IEEE P1549-2015/Cor1/D2, pp. 1-11, Jan. 2016.
  9. M. Lisrerre, R. Teodorescu, and F. Blaabjerg, "Multiple harmonic control for three phase grid converter system with the use of PI-RES current controller in rotating frame," IEEE Trans. Power Electronics, Vol. 21, No. 3, May 2006.
  10. D. Sha, D. Wu, and X. Liao "Analysis of a hybrid controlled three phase grid-connected inverter with harmonic compensation in synchronous reference frame," IET Power Electronic., Vol. 4, pp. 743-751, Sep. 2010.
  11. E. S. Kim, U. S. Seong, J. S. Lee, and S. H. Hwang, "Compensation of dead time effects in grid-tie single phase inverter using SOGI," in Applied Power Electronic Conference and Exposition (APEC), pp. 2633-2637, 2017.
  12. A. G. Yepes, F. D. Freijedo, J. Doval-Gandoy, O. Lopez, J. Malvar, and P. Fernandez-Comesana, "Effect of discretization methods on the performance of resonant controllers," IEEE Trans. Power Electronics, Vol. 25, No. 7, pp. 1692-1712, Jul. 2010. https://doi.org/10.1109/TPEL.2010.2041256
  13. A. G. Yepes, F. D. Freijedo, O. Lopez, and J. Doval-Gandoy, "High-performance digital resonant controllers implemented with two integrators," IEEE Trans. Power Electronics, Vol. 26, No. 2, pp. 1692-1712, pp. 563-576 Feb. 2011. https://doi.org/10.1109/TPWRD.2010.2102779
  14. M. Ciobotaru, R. Teodorescu, and F. Blaabjerg, "A new singlephase PLL structure based on second order generalized integrator," in Proc. 37th IEEE Power Electronics Specialists Conference, pp 1-6, 2006.
  15. A. Yazdani and R. Iravani, Voltage-sourced converters in power systems: modeling, control, and applications. hoboken, New Jersey: Wiley, pp. 451, 2010.