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2019-03-05

Virtual Synchronous Motor Dynamic Power Decoupling Strategy

By Xintian Liu, Yucai Li, Yao He, Xinxin Zheng, and Guojian Zeng
Progress In Electromagnetics Research C, Vol. 90, 209-224, 2019
doi:10.2528/PIERC18102504

Abstract

Due to the existence of power coupling the virtual synchronous motor (VSG) will lead to overshoot fluctuations in the power adjustment process, thus affecting the control performance. Compared to the traditional direct current control inverter based on coordinate transformation, VSG model is more complex and difficult to achieve decoupling. This paper presents a dynamic power decoupling method by studying the coupling relationship between active power and reactive power of VSG. Firstly, the inverter grid-connected model is established, and the power expression is analyzed when the inverter output impedance is negligible. Then the virtual active power and reactive power expressions are obtained through coordinate transformation. Several key state equations and virtual states of the VSG are obtained. The power expression performs small signal perturbation to obtain the dynamic model of the VSG. From this, the dynamic model of the VSG can be analyzed to obtain the coupling relationship between the dynamic powers, and the series power compensation is used to decouple the dynamic power coupling. Finally, the correctness of the theoretical analysis and the effectiveness of the decoupling method are verified by simulation and experiments.

Citation


Xintian Liu, Yucai Li, Yao He, Xinxin Zheng, and Guojian Zeng, "Virtual Synchronous Motor Dynamic Power Decoupling Strategy," Progress In Electromagnetics Research C, Vol. 90, 209-224, 2019.
doi:10.2528/PIERC18102504
http://jpier.org/PIERC/pier.php?paper=18102504

References


    1. Gao, Y. and Q. Ai, "Hierarchical distributed coordination control of active distribution network with sparse communication in micro-grid networks," Automation of Electric Power System, Vol. 4, 019, 2018.

    2. Geng, M., et al., "Micro-net-“Organic Cells” in the future energy internet system," Automation of Electric Power Systems, Vol. 41, No. 19, 1-11, 2017.

    3. Han, Z.-X., Power System Analysis, 1993.

    4. Raj, D. C. and D. N. Gaonkar, "Frequency and voltage droop control of parallel inverters in microgrid," 2016 IEEE 2nd International Conference on Control, Instrumentation, Energy & Communication (CIEC), 407-411, 2016.
    doi:10.1109/CIEC.2016.7513771

    5. Zhong, Q. C. and G. Weiss, "Synchronverters: Inverters that mimic synchronous generators," IEEE Transactions on Industrial Electronics, Vol. 58, No. 4, 1259-1267, 2011.
    doi:10.1109/TIE.2010.2048839

    6. Natarajan, V. and G. Weiss, "Almost global asymptotic stability of a grid-connected synchronous generator,", arXiv preprint arXiv:1610.04858, 2016.

    7. Natarajan, V. and G. Weiss, "Synchronverters with better stability due to virtual inductors, virtual capacitors and anti-windup," IEEE Transactions on Industrial Electronics, Vol. PP, No. 99, 1-1, 2017.

    8. Li, D., et al., "A self-adaptive inertia and damping combination control of vsg to support frequency stability," IEEE Transactions on Energy Conversion, Vol. 32, No. 1, 397-398, 2017.
    doi:10.1109/TEC.2016.2623982

    9. Zhong, Q. C., et al., "Self-synchronized synchronverters: Inverters without a dedicated synchronization unit," IEEE Transactions on Power Electronics, Vol. 29, No. 2, 617-630, 2014.
    doi:10.1109/TPEL.2013.2258684

    10. Wu, H., et al., "Small-signal modeling and parameters design for virtual synchronous generators," IEEE Transactions on Industrial Electronics, Vol. 63, No. 7, 4292-4303, 2016.
    doi:10.1109/TIE.2016.2543181

    11. Dong, S. and Y. C. Chen, "Adjusting synchronverter dynamic response speed via damping correction loop," IEEE Transactions on Energy Conversion, Vol. PP, No. 99, 1-1, 2017.

    12. Qu, K., et al., "Decoupled control strategy of LCL inverter based on state feedback," Transactions of China Electrotechnical Society, Vol. 31, No. 20, 130-138, 2016.

    13. Peng, Q., et al., "Design of double closed loop decoupling controller for LCL three phase grid-connected inverter," Journal of China Electrotechnical Society, Vol. 29, No. 4, 103-110, 2014.

    14. Ye, Z. and X. Yan, "Analysis of power coupling characteristics of microgrid and decoupling control," Grid Technology, Vol. 40.3, 812-818, 2016.

    15. Li, B., et al., "New control scheme of power decoupling based on virtual synchronous generator," IEEE Power and Energy Conference at Illinois, 1-8, 2016.

    16. Li, B., et al., "Improved power decoupling control strategy based on virtual synchronous generator," Iet Power Electronics, Vol. 10, No. 4, 462-470, 2017.
    doi:10.1049/iet-pel.2016.0608

    17. Li, W., et al., "Power dynamic coupling mechanism and synchronization frequency resonance suppression strategy of virtual synchronous generator," Proceeding of the CSEE, Vol. 37, No. 2, 381-390, 2017.

    18. Akagi, H., H. Watanabe, and M. Aredes, Instantaneous Power Theory and Applications to Power Conditioning, IEEE Press, New Jersey, 2007.
    doi:10.1002/0470118938

    19. Chen, X., et al., "Step-by-step controller design of voltage closed-loop control for virtual synchronous generator," IEEE Energy Conversion Congress and Exposition, 3760-3765, 2015.
    doi:10.1109/ECCE.2015.7310191

    20. Zhang, P., et al., "Power decoupling strategy based on ‘virtual negative resistor’ for inverters in low-voltage microgrids," IET Power Electronics, Vol. 9, No. 5, 1037-1044, 2016.
    doi:10.1049/iet-pel.2015.0137

    21. Wu, T., et al., "A unified virtual power decoupling method for droop-controlled parallel inverters in microgrids," IEEE Transactions on Power Electronics, Vol. 31, No. 8, 5587-5603, 2016.
    doi:10.1109/TPEL.2015.2497972

    22. De Brabandere, K., et al., "A voltage and frequency droop control method for parallel inverters," Pesc Record-IEEE Power Electronics Specialists Conference, 1107-1115, 2004.

    23. Erickson, R. W. and D. Maksimovic, Fundamentals of Power Electronics, Springer Science & Business Media, 2007.

    24. Hu, S., Principle of Automatic Control, 2001.

    25. Li, Y., et al., "Modeling, analysis and design for hybrid power systems with dual-input DC/DC converter," IEEE Energy Conversion Congress and Exposition, 2009. Ecce., 3203-3210, 2009.