Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Fuzzy logic feed-forward impedance shaping of DAB converter in DC microgrid with CPL load

  • Ravishankar Gupta (Department of Electrical Engineering, Madan Mohan Malaviya University of Technology) ;
  • Navdeep Singh (Department of Electrical Engineering, Madan Mohan Malaviya University of Technology)
  • Received : 2022.09.27
  • Accepted : 2023.04.18
  • Published : 2023.10.20
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Abstract

In a DC microgrid, the dual active bridge (DAB) converter is employed for voltage conversion and power transfer. DAB-based energy storage systems (ESSs) are known as constant power loads (CPLs). To improve the input current quality of DAB converter, an LC filter is cascaded to a DAB converter. Impedance interaction takes place between the impedance of the LC filter (Zout) and the impedance of the DAB converter (Zin). ESSs are affected by the impedance interactions of cascaded systems. This interaction leads to significant oscillation and instability, which in turn causes voltage fluctuation and power loss. To overcome instability, this paper proposes a modified fuzzy logic controller (FLC), an active voltage stabilizer (AVS), and feed-forward (FF) controller to reshape the impedance of the DAB converter. In the modified controller, the FLC handles precise voltage monitoring, the AVS handles the transient stability limit, and the FF controller removes the impedance interaction between Zin and Zout. The feed-forward coefficient is calculated through the Routh-Hurwitz criterion. The suggested controller assures system stability during load variation, a quick dynamic response, and precise voltage monitoring. In addition, it achieves reductions in the settling time, rise time, and overshoot. This leads to reliable microgrid operation when compared to the traditional PI (PI+ AVS), and (PI+ AVS+FF) controllers. The modified controller is verified by results obtained with an OPL-RT-based hardware-in-the-loop (HIL).

Keywords

Acknowledgement

There are no financial conflicts that would have appeared to have an impact on the research presented in this paper.

References

  1. Han, M., Liu, X., Pu, H., et al.: Real-time online optimal control of current-fed dual active bridges based on machine learning. J. Power Electron. 20, 43-52 (2020) https://doi.org/10.1007/s43236-019-00013-6
  2. Zhang, M., Xu, Q., Zhang, C., Nordstrom, L., Blaabjerg, F.: Decentralized coordination and stabilization of hybrid energy storage systems in DC microgrids. IEEE Trans. Smart Grid 13, 1751-1761 (2022) https://doi.org/10.1109/TSG.2022.3143111
  3. Yadav, M., Singh, N.: Small-signal modeling-based hybrid optimized current and voltage controller for unbalanced DC microgrid. Int. Trans. Electr. Energy Syst. 31, 12797 (2021)
  4. Zhu, Z., Xiao, F., Liu, J., et al.: Optimal modulation strategy based on fundamental reactive power for dual-active-bridge converters. J. Power Electron. 21, 1780-1792 (2021) https://doi.org/10.1007/s43236-021-00319-4
  5. Zhang, Y., Qu, X., Wang, G., Chen, W., Huang, Z.: Investigation of multiple resonances and stability enhancement in multi-source DC distribution power systems. IEEE J. Emerg. Select. Top. Circ. Syst. 12(1), 90-97 (2022) https://doi.org/10.1109/JETCAS.2022.3146875
  6. Liu, W., Cui, X., Zhou, J., et al.: Composite passivity-based control of DC/DC boost converters with constant power loads in DC Microgrids. J. Power Electron. 22, 1927-1937 (2022) https://doi.org/10.1007/s43236-022-00492-0
  7. Hussain, M.N., Agarwal, V.: A novel feedforward stabilizing technique to damp power oscillations caused by DC-DC converters fed from a DC bus. IEEE J. Emerg. Select. Top. Power Electr. 8(2), 1528-1535 (2020) https://doi.org/10.1109/JESTPE.2019.2898354
  8. Wu, M., Lu, D.D.-C.: A novel stabilization method of lc input filter with constant power loads without load performance compromise in DC microgrids. IEEE Trans. Industr. Electron. 62(7), 4552-4562 (2015) https://doi.org/10.1109/TIE.2014.2367005
  9. Guan, Y., Xie, Y., Wang, Y., Liang, Y., Wang, X.: An active damping strategy for input impedance of bidirectional dual active bridge DC-DCDC-DC converter: modeling, shaping, design, and experiment. IEEE Trans. Industr. Electron. 68(2), 1263-1274 (2021) https://doi.org/10.1109/TIE.2020.2969126
  10. Pang, S., et al.: Large-signal stabilization of power converters cascaded input filter using adaptive energy shaping control. IEEE Trans. Transp. Electrifc. 7, 838-853 (2021) https://doi.org/10.1109/TTE.2020.3021954
  11. Feng, F., Wu, F., Gooi, H.B.: Impedance shaping of isolated two-stage AC-DC-DC converter for stability improvement. IEEE Access 7, 18601-18610 (2019) https://doi.org/10.1109/ACCESS.2019.2892080
  12. Iyer, V.M., Gulur, S., Bhattacharya, S., Jou, K.E.: An active voltage stabilizer for a DC microgrid system. IEEE Access 9, 86786-86800 (2021) https://doi.org/10.1109/ACCESS.2021.3087543
  13. Feng, F., Zhang, X., Zhang, J., Gooi, H.B.: Stability enhancement via controller optimization and impedance shaping for dual active bridge-based energy storage systems. IEEE Trans. Indus. Electr. 68, 5863-5874 (2021) https://doi.org/10.1109/TIE.2020.2992947
  14. Chen, L., Gao, F., Shen, K., Wang, Z.: Predictive control based DC microgrid stabilization with the dual active bridge converter. IEEE Trans. Indus. Electr. 67, 8944-8956 (2020) https://doi.org/10.1109/TIE.2020.2965460
  15. Iyer, V.M., Gulur, S., Bhattacharya, S.: Small-signal stability assessment and active stabilization of a bidirectional battery charger. IEEE Trans. Indus. Appl. 55, 563-574 (2019) https://doi.org/10.1109/TIA.2018.2871101
  16. Erickson, R.W., Maksimovic, D.: Fundamentals of power electronics, 2nd edn. Kluwer, Norwell (2004)
  17. Fan, S., Wu, F., Liu, H.: Unified closed-loop control and parameters design of buck-boost current-fed isolated DC-DC converter with constant power load. IEEE J. Emerg. Select. Top. Power Electr. 10, 4207-4217 (2022) https://doi.org/10.1109/JESTPE.2021.3077623
  18. Yadav, M., Jaiswal, P., Singh, N.: Fuzzy logic-based droop controller for parallel inverter in autonomous microgrid using vectored controlled feed-forward for unequal impedance. J. Inst. Eng. India Ser. B 102, 691-705 (2021) https://doi.org/10.1007/s40031-021-00588-4
  19. Bhosale, R., Agarwal, V.: Fuzzy logic control of the ultracapacitor interface for enhanced transient response and voltage stability of a DC microgrid. IEEE Trans. Indus. Appl. 55(1), 712-720 (2019) https://doi.org/10.1109/TIA.2018.2870349