Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Adaptive active damping method of grid-connected inverter based on model predictive control in weak grid

  • Xue, Ruinan (School of Electrical Engineering, Guangxi University) ;
  • Li, Guojin (School of Electrical Engineering, Guangxi University) ;
  • Tong, Hengzhou (School of Electrical Engineering, Guangxi University) ;
  • Chen, Yanming (School of Electrical Engineering, Guangxi University)
  • Received : 2021.10.19
  • Accepted : 2022.03.14
  • Published : 2022.07.20
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Abstract

The LCL-type grid-connected inverter based on finite control set model predictive control (FCS-MPC) is suitable for weak grids because of its good robustness and fast dynamic response. However, in an FCS-MPC-based system, the variable switching frequency causes the spread of the inverter-side current harmonic spectrum. Thus, the grid-side current may be distorted because the harmonics are amplified to the grid side due to the resonance peak of the LCL filter. To solve the above problem, this paper proposes an adaptive active damping (AD) method to eliminate the resonant effects. First, the system based on an MPC controller is regarded as a closed-loop system of the grid-side current, and the resonance peak is suppressed effectively by an AD, which consists of a virtual resistor and a virtual capacitor. Second, to balance the resonance suppression and dynamic performance of the system under weak grid conditions, the grid impedance is measured and the optimal AD values for different grid impedance are calculated online. Compared with the fixed-value AD, the proposed method has better resonance suppression and higher bandwidth. The effectiveness and feasibility of the proposed control strategy are verified by simulations and experiments.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation of China (51567004) and the High-level Innovation Team and Distinguished Scholar Program of Guangxi Higher Education Institutions under Grant Guangxi teach talent (2020) No. 6.

References

  1. Liserre, M., Teodorescu, R., Blaabjerg, F.: Stability of photovoltaic and wind turbine grid-connected inverters for a large set of grid impedance values. IEEE Trans. Power Electron. 21(1), 263-272 (2006) https://doi.org/10.1109/TPEL.2005.861185
  2. Vieira, R.P., Martins, L.T., Massing, J.R., Stefanello, M.: Sliding mode controller in a multiloop framework for a grid-connected VSI with LCL filter. IEEE Trans. Ind. Electron. 65(6), 4714-4723 (2018) https://doi.org/10.1109/tie.2017.2772143
  3. Fu, X., Li, S.: Control of single-phase grid-connected converters with LCL filters using recurrent neural network and conventional control methods. IEEE Trans. Power Electron. 31(7), 5354-5364 (2016) https://doi.org/10.1109/TPEL.2015.2490200
  4. Xia, C., Liu, T., Shi, T., Song, Z.: A simplified finite-control-set model-predictive control for power converters. IEEE Trans. Ind. Inform. 10(2), 991-1002 (2014) https://doi.org/10.1109/TII.2013.2284558
  5. Aguilera, R.P., Quevedo, D.E.: Predictive control of power converters: designs with guaranteed performance. IEEE Trans. Ind. Inform. 11(1), 53-63 (2015) https://doi.org/10.1109/TII.2014.2363933
  6. Ramirez, R.O., Espinoza, J.R., Baier, C.R., Rivera, M., Villarroel, F., Guzman, J.I., Melin, P.E.: Finite-state model predictive control with integral action applied to a single-phase z-source inverter. IEEE J. Emerg. Sel Top Power Electron. 7(1), 228-239 (2019) https://doi.org/10.1109/jestpe.2018.2870985
  7. Vazquez, S., Zafra, E., Aguilera, R.P., Geyer, T., Leon, J.I., Franquelo, L.G.: Prediction model with harmonic load current components for FCS-MPC of an uninterruptible power supply. IEEE Trans. Power Electron. 37(1), 322-331 (2022) https://doi.org/10.1109/TPEL.2021.3098948
  8. Hu, J., Zhu, J., Dorrell, D.G.: Model predictive control of grid-connected inverters for PV systems with flexible power regulation and switching frequency reduction. IEEE Trans. Ind. Appl. 51(1), 587-594 (2015) https://doi.org/10.1109/TIA.2014.2328785
  9. Baier, C.R., Ramirez, R.O., Marciel, E.I., Hernandez, J.C., Melin, P.E., Espinosa, E.E.: FCS-MPC without steady-state error applied to a grid-connected cascaded H-bridge multilevel inverter. IEEE Trans. Power Electron. 36(10), 11785-11799 (2021) https://doi.org/10.1109/TPEL.2021.3065003
  10. Aguirre, M., Kouro, S., Rojas, C.A., Vazquez, S.: Enhanced switching frequency control in FCS-MPC for power converters. IEEE Trans. Ind. Electron. 68(3), 2470-2479 (2021) https://doi.org/10.1109/TIE.2020.2973907
  11. Young, H.A., Perez, M.A., Rodriguez, J.: Analysis of finite-control-set model predictive current control with model parameter mismatch in a three-phase inverter. IEEE Trans. Ind. Electron. 63(5), 3100-3107 (2016) https://doi.org/10.1109/TIE.2016.2515072
  12. Lim, C.S., Goh, H.H., Lee, S.S.: Long-prediction-horizon nearoptimal model predictive grid current control for PWM-Driven VSIs with LCL filters. IEEE Trans. Power Electron. 36(2), 2246-2257 (2021) https://doi.org/10.1109/tpel.2020.3011227
  13. Chen, X., Wu, W., Gao, N., Chung, H.S.H., Liserre, M., Blaabjerg, F.: Finite control set model predictive control for LCL-filtered grid-tied inverter with minimum sensors. IEEE Trans. Ind. Electron. 67(12), 9980-9990 (2020) https://doi.org/10.1109/tie.2019.2962444
  14. Panten, N., Hofmann, N., Fuchs, F.W.: Finite control set model predictive current control for grid-connected voltage-source converters with LCL filters: a study based on different state feedbacks. IEEE Trans. Power Electron. 31(7), 5189-5200 (2016) https://doi.org/10.1109/TPEL.2015.2478862
  15. Xue, C., Zhou, D., Li, Y.: Hybrid model predictive current and voltage control for LCL-filtered grid-connected inverter. IEEE J. Emerg. Sel. Top. Power Electron. 9(5), 5747-5760 (2021) https://doi.org/10.1109/JESTPE.2020.3049083
  16. Pena-Alzola, R., Liserre, M., Blaabjerg, F., Ordonez, M., Yang, Y.: LCL-filter design for robust active damping in grid-connected converters. IEEE Trans. Ind. Inform. 10(4), 2192-2203 (2014) https://doi.org/10.1109/TII.2014.2361604
  17. Bao, C., Ruan, X., Wang, X., Li, W., Pan, D., Weng, K.: Step-by-step controller design for LCL-type grid-connected inverter with capacitor-current-feedback active-damping. IEEE Trans. Power Electron. 29(3), 1239-1253 (2014) https://doi.org/10.1109/TPEL.2013.2262378
  18. Pan, D., Ruan, X., Bao, C., Li, W., Wang, X.: Optimized controller design for LCL-type grid-connected inverter to achieve high robustness against grid-impedance variation. IEEE Trans. Ind. Electron. 62(3), 1537-1547 (2015) https://doi.org/10.1109/TIE.2014.2341584
  19. Xin, Z., Loh, P.C., Wang, X., Blaabjerg, F., Tang, Y.: Highly accurate derivatives for LCL-filtered grid converter with capacitor voltage active damping. IEEE Trans. Power Electron. 31(5), 3612-3625 (2016) https://doi.org/10.1109/TPEL.2015.2467313
  20. Rodriguez-Diaz, E., Freijedo, F.D., Vasquez, J.C., Guerrero, J.M.: Analysis and comparison of notch filter and capacitor voltage feedforward active damping techniques for LCL grid-connected converters. IEEE Trans. Power Electron. 34(4), 3958-3972 (2019) https://doi.org/10.1109/tpel.2018.2856634
  21. Massing, J.R., Stefanello, M., Grundling, H.A., Pinheiro, H.: Adaptive current control for grid-connected converters with LCL filter. IEEE Trans. Ind. Electron. 59(12), 4681-4693 (2012) https://doi.org/10.1109/TIE.2011.2177610
  22. Cortes, P., Rodriguez, J., Quevedo, D.E., Silva, C.: Predictive current control strategy with imposed load current spectrum. IEEE Trans. Power Electron. 23(2), 612-618 (2008) https://doi.org/10.1109/TPEL.2007.915605
  23. Ferreira, S.C., Gonzatti, R.B., Pereira, R.R., Silva, C.H.D., Silva, L.E.B., Lambert-Torres, G.: Finite control set model predictive control for dynamic reactive power compensation with hybrid active power filters. IEEE Trans. Ind. Electron. 65(3), 2608-2617 (2018) https://doi.org/10.1109/tie.2017.2740819
  24. Scoltock, J., Geyer, T., Madawala, U.K.: A model predictive direct current control strategy with predictive references for MV grid-connected converters with LCL-filters. IEEE Trans. Power Electron. 30(10), 5926-5937 (2015) https://doi.org/10.1109/TPEL.2014.2375919
  25. Zhang, X., Wang, Y., Yu, C., Guo, L., Cao, R.: Hysteresis model predictive control for high-power grid-connected inverters with output LCL filter. IEEE Trans. Ind. Electron. 63(1), 246-256 (2016) https://doi.org/10.1109/TIE.2015.2477060
  26. Serpa, L.A., Ponnaluri, S., Barbosa, P.M., Kolar, J.W.: A modified direct power control strategy allowing the connection of three-phase inverters to the grid through LCL filters. IEEE Trans. Ind. Appl. 43(5), 1388-1400 (2007) https://doi.org/10.1109/TIA.2007.904438
  27. Asiminoaei, L., Teodorescu, R., Blaabjerg, F., Borup, U.: Implementation and test of an online embedded grid impedance estimation technique for PV inverters. IEEE Trans. Ind. Electron. 52(4), 1136-1144 (2005) https://doi.org/10.1109/TIE.2005.851604