Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Min-projection strategy with improved dynamic and steady state characteristics for three-phase grid-connected inverters

  • Yang, Bin (School of Electric Power Engineering, South China University of Technology) ;
  • Xiao, Wenxun (School of Electric Power Engineering, South China University of Technology) ;
  • Xie, Fan (School of Electric Power Engineering, South China University of Technology) ;
  • Zhang, Bo (School of Electric Power Engineering, South China University of Technology) ;
  • Chen, Yanfeng (School of Electric Power Engineering, South China University of Technology) ;
  • Qiu, Dongyuan (School of Electric Power Engineering, South China University of Technology)
  • Received : 2021.12.15
  • Accepted : 2022.05.16
  • Published : 2022.09.20
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Abstract

The min-projection strategy (MPS) is a switching rule with better convergence speed, which can improve the dynamic characteristics of three-phase grid-connected inverters. However, the grid-connected current harmonics of the system are large when the MPS is used directly in the digital control framework due to the limitations of the sampling frequency. To solve this problem, an improved min-projection strategy is proposed in this paper by introducing a zero voltage vector to the control. First, the non-zero voltage vector is selected through the switching law function of the MPS. Then the time occupied by the non-zero voltage vector and the zero voltage vector can be obtained through an error function, which is established by the principle of minimum current error. Finally, the switching signal can be obtained for control, based on the method of duty cycle modulation. This method can realize fast current tracking and current decoupling control, reduce the grid-connected current harmonics, and improve the steady state performance of the system without increasing costs. The effectiveness of the proposed method is verified by simulations and experimental results.

Keywords

Acknowledgement

This work was supported by National Natural Science Foundation of China, (Grant No. U2166601), Guangdong Basic and Applied Basic Research Foundation, China (Grant No. 2020A1515010763), the Team Program of Natural Science Foundation of Guangdong Province, China (Grant No. 2017B030312001).

References

  1. Pati A K, Sahoo N C.: A super-twisting sliding mode observer for boost inverter-based hybrid photovoltaic-battery system control. Trans. Inst. Meas. Control. (2020). https://doi.org/10.1177/0142331220906964
  2. Khan, M, Liu H, Yang Z, et al.: A comprehensive review on grid connected photovoltaic inverters, their modulation techniques, and control strategies. Energies 13, 4185 (2020) https://doi.org/10.3390/en13164185
  3. Ding, W., Pan, Z.: A new predictive direct power control solution for three-phase grid-connected inverters. Trans China Electrotech Soc. 30(14), 67-74 (2015)
  4. Zhang, T., Chen, X.Y., Qi, C., et al.: Leg-by-leg-based finitecontrol- set model predictive control for two-level voltage-source inverters. J. Power Electron. 19(5), 1162-1170 (2019)
  5. Esmaeili, H., Asadi, M.: A sliding mode controller based on robust model reference adaptive proportional-integral control for standalone three-phase inverter. J. Mod. Power Syst. Clean Energy. 9(3), 668-678 (2021) https://doi.org/10.35833/MPCE.2019.000077
  6. Yan, Q., Wu, X., Yuan, X., et al.: An improved grid-voltage feedforward strategy for high-power three-phase grid-connected inverters based on the simplified repetitive predictor. IEEE Trans. Power Electron. 31(5), 3880-3897 (2016) https://doi.org/10.1109/TPEL.2015.2461632
  7. Kukrer, O., Bayhan, S., Komurcugil, H.: Model-based current control strategy with virtual time constant for improved dynamic response of three-phase grid-connected vsi. IEEE Trans. Ind. Electron. 66(6), 4156-4165 (2018) https://doi.org/10.1109/TIE.2018.2863195
  8. Xie, Z., Chen, Y., Wu, W., et al.: Admittance modeling and stability analysis of grid-connected inverter with LADRC-PLL. IEEE Trans. Ind. Electron. 68(12), 12272-12284 (2020)
  9. Wang, X., Liu, X., Mo, Z., et al.: Novel model predictive direct power control strategy for grid-connected three-level inverters. IET Power Electron. 13(16), 3727-3733 (2020) https://doi.org/10.1049/iet-pel.2020.0038
  10. Xiao, W.X., Zhang, B., Qiu, D.Y.: Switching rule based on minprojection strategy for single phase DC-AC converter. Proc. IEEE Applied Power Elec. Conf. Exposition (2015). https://doi.org/10.1109/APEC.2015.7104683
  11. Hai, L., Antsaklis, P.J.: Stability and stabilizability of switched linear systems: a survey of recent results. IEEE Trans. Autom. Control. 54(2), 308-322 (2009) https://doi.org/10.1109/TAC.2008.2012009
  12. Xiao, W., Zhang, B., Chen, L.G.: Min-projection-strategy switching rules for DC-DC converters modeled as piecewise linear systems. Contl Theor Appl. 26(03), 329-331 (2009)
  13. Mao, J., Xiao, W., Zhang, B., et al.: Synthetic velocity vectors control law based on projection-value-based strategy for H6 inverter. IEEE Access. 99, 22023-22034 (2021)
  14. Baygi, M.O., Ghazi, R., Monfared, M.: Applying the min-projection strategy to improve the transient performance of the three-phase grid-connected inverter. ISA Trans. 53(4), 1131-1142 (2014) https://doi.org/10.1016/j.isatra.2014.04.004
  15. Wang, Y., Wang, X., Xie, W., et al.: Deadbeat model-predictive torque control with discrete space-vector modulation for PMSM drives. IEEE Trans. Ind. Electron. 64(5), 3537-3547 (2017) https://doi.org/10.1109/TIE.2017.2652338
  16. Lim, C.S., Lee, S.S., Nutkani, I.U., et al.: Near-optimal MPC algorithm for actively damped grid-connected PWM-VSCs with LCL filters. IEEE Trans. Ind. Electron. 67(6), 4578-4589 (2020)
  17. Abdelrahem M, Rodriguez J, Kennel, R.: Improved direct model predictive control for grid-connected power converters. Energies (2020). https:// doi. org/ 10. 3390/ en131 02597 https://doi.org/10.3390/en13102597
  18. Alsofyani, I.M., Bak, Y., Lee, K.B.: Improved finite set-predictive torque control of PMSM fed by indirect matrix converter with discrete space vector modulation. Electronics 9, 2133 (2020) https://doi.org/10.3390/electronics9122133
  19. Lyu, J., Ma, B., Yan, H., et al.: A Modified finite control set model predictive control for 3L-NPC grid-connected inverters using virtual voltage vectors. J. Electr. Eng. Technol. 15(1), 121-133 (2020) https://doi.org/10.1007/s42835-019-00305-8
  20. Xiao, W., Zhang, B.: Switching rule based on min-projection strategy of DC-DC converters. Proc. CSEE. 29(03), 1-6 (2009)