Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Predictive current controller and compensator-based discrete current controller for single-phase bridge inverters

  • Zhou, Jinghua (School of Electrical and Control Engineering, North China University of Technology) ;
  • Xu, Shuang (School of Electrical and Control Engineering, North China University of Technology) ;
  • Shao, Riming (Alpha Technologies) ;
  • Chang, Liuchen (Department of Electrical and Computer Engineering, University of New Brunswick)
  • Received : 2021.11.26
  • Accepted : 2022.04.12
  • Published : 2022.09.20
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Abstract

Transfer efficiency and power quality are two critical factors when it comes to grid-connected distributed generation systems. Single-phase inverters are commonly used in distributed generation systems under 10 kilowatts as the connection between the gird and renewable energy sources (RESs). In this application, grid current distortion plays a pivotal role in determining inverter performance. In this article, an improved current control strategy based on a predictive current controller (PCC) and a compensator is presented to decrease current harmonic distortion and increase power quality. The controller design method inspects a single-phase inverter system as a digital platform, and designs the controller in discrete time in order to obtain a more precise and effective controller than that in continuous time. The discretization procedures using sampling and hold (S&H) are taken into consideration in the design process. The improved current controller is a DSP-based digital current controller for grid-connected single-phase bridge inverters, whose performance is optimized by considering the time delay caused by analog-digital conversion (ADC) and computations. A comparison has been made to analyze the performance of the single-phase grid-connected inverter system with PCC and ICC. Experimental results are shown to validate the effectiveness of the designed current controller.

Keywords

Acknowledgement

This is funded by National Natural Science Foundation of China (51777002).

References

  1. Cao, B., Chang, L., Xu, S., Shao, R.: Advanced variable switching frequency control for improving weighted efficiency of distributed renewable generation systems. IEEE Access 8, 140643-140653 (2020). https:// doi.org/10.1109/ ACCESS.2020.3011727
  2. Prakash, S., Misra, S.: A three sample based PLL-less hysteresis current control and stability analysis of a single phase active distribution system. IEEE Trans Ind Electron 68(8), 7045-7060 (2020) https://doi.org/10.1109/TIE.2020.3000094
  3. Holmes, D.G., Davoodnezhad, R., McGrath, B.P.: An improved three-phase variable-band hysteresis current regulator. IEEE Trans Power Electron. 28(1), 441-450 (2013). https://doi.org/10.1109/TPEL2012.2199133
  4. Serpa, L.A., Round, S.D., Kolar, J.W.: A virtual-flux decoupling hysteresis current controller for mains connected inverter systems. IEEE Trans. Power Electron. 22(5), 1766-1777 (2007). https://doi.org/10.1109/TPEL.2007.904213
  5. Wu, F., Zhang, L., Wu, Q.: Simple unipolar maximum switching frequency limited hysteresis current control for grid-connected inverter. IET Power Electron. 7(4), 933-945 (2013). https://doi.org/10.1049/iet-pel. 2013.0284
  6. Wu, F., Feng, F., Luo, L., Duan, J., Sun, L.: Sampling period online adjusting-based hysteresis current control without band with constant switching frequency. IEEE Trans. Ind. Electron. 62(1), 270-277 (2015). https://doi.org/10.1109/TIE.2014.2326992
  7. Zhang, L., et al.: A sensorless implementation of the parabolic current control for single-phase stand-alone inverters. IEEE Trans. Power Electron. 31(5), 3913-3921 (2016). https://doi.org/10.1109/TPEL.2015. 2464292
  8. Wang, G., Li, Y.W.: Parabolic PWM for current control of voltage-source converters (VSCs). IEEE Trans. Ind. Electron. 57(10), 3491-3496 (2010). https://doi.org/10.1109/TIE.2009.2038342
  9. Fahad, A.H., Reza, M.S.: Single-Phase Shunt Active Power Filter Using Parabolic PWM for Current Control. In: 2019 IEEE 7th International Conference on Smart Energy Grid Engineering (SEGE), Aug. 2019, pp. 134-138, doi: https://doi.org/10.109/SEGE.2019.8859868.
  10. Cao, B., Chang, L., Shao, R.: Predictive current controller for single-phase grid-connected VSIs with compensation for timedelay effect and system uncertainty. IEEE J. Emerg. Sel. Top. Power Electron. 6(4), 1761-1768 (2018). https://doi.org/10.1109/JESTPE.2018. 2806895
  11. Mohomad, H., Saleh, S.A., Chang, L.: Disturbance estimatorbased predictive current controller for single-phase interconnected PV systems. IEEE Trans. Ind. Appl. 53(5), 4201-4209 (2017). https://doi.org/10.1109/TIA.2017.27163 63
  12. Mohomad, A.R.H., Saleh, S.A., Shao, R., Chang, L., Xu, S.: Dead-beat current controller for voltage source inverter with LCL Grid-Tied Filter. In: 2018 IEEE Energy Conversion Congress and Exposition (ECCE), Sep. 2018, pp. 3061-3068, doi: https://doi.org/10.1109/ECCE.2018.8557525
  13. de Bosio, F., de Ribeiro, S.L.A., Freijedo, F.D., Pastorelli, M., Guerrero, J.M.: Discrete-time domain modeling of voltage source inverters in standalone applications: enhancement of regulators performance by means of Smith predictor. IEEE Trans Power Electron 32(10), 8100-8114 (2017) https://doi.org/10.1109/TPEL.2016.2632527
  14. Abdel-Rahim, O., Funato, H.: A novel model predictive control for high gain switched inductor power conditioning system for photovoltaic applications. In: 2014 IEEE Innovative Smart Grid Technologies - Asia (ISGT ASIA), May 2014, pp. 170-174, doi: https://doi.org/10.1109/ISGT- Asia.2014.6873784
  15. Young, H.A., Perez, M.A., Rodriguez, J., Abu-Rub, H.: Assessing finite-control-set model predictive control: a comparison with a linear current controller in two-level voltage source inverters. IEEE Ind. Electron. Mag. 8(1), 44-52 (2014). https://doi.org/10.1109/MIE.2013.2294870
  16. Kwak, S., Kim, S.-E., Park, J.-C.: Predictive current control methods with reduced current errors and ripples for single-phase voltage source inverters. IEEE Trans. Ind. Inform. 11(5), 1006-1016 (2015). https://doi.org/10.1109/TII.2015.2463757
  17. Castello, J., Espi, J.M., Garcia-Gil, R.: A new generalized robust predictive current control for grid-connected inverters compensates anti-aliasing filters delay. IEEE Trans. Ind. Electron. 63(7), 4485-4494 (2016). https://doi.org/10.1109/TIE.2015.2497303
  18. Zhang, Y., Wang, Z., Jiao, J., Liu, J.: Grid-voltage sensorless model predictive control of three-phase PWM rectifier under unbalanced and distorted grid voltages. IEEE Trans. Power Electron. 35(8), 8663-8672 (2020). https://doi.org/10.1109/TPEL.2019.2963206