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Obtaining Robust Performance of a Current fed Voltage Source Inverter for Virtual Inertia Response in a Low Short Circuit Ratio Condition

Author

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  • Clint Z. Ally

    (Department of Electrical Engineering, Anton de Kom University of Suriname, Paramaribo, Suriname
    Electrical Energy Systems, Eindhoven University of Technology (TU/e), 5612 AP Eindhoven, The Netherlands)

  • Erik C. W. de Jong

    (Electrical Energy Systems, Eindhoven University of Technology (TU/e), 5612 AP Eindhoven, The Netherlands)

Abstract

Low inertia levels are typical in island power systems due to the relatively small rotational generation. Displacing rotational generation units with static inertia-less PV power results in a significant increase in the frequency volatility. Virtual inertia provided by inverter-storage systems can resolve this issue. However, a low short circuit ratio (SCR) at the point of common coupling together with a fast phase locked loop (PLL) will compromise the response performance of the system. To address this issue, a robust PI controller (RPI) for the inner current-loop of a current fed grid-connected inverter is proposed. The PLL disturbance and grid impedance are incorporated into a single model and recast to a generalized representation of the system, thereby allowing easy tuning of the RPI by the mixed sensitivity H ∞ method. The performance of the RPI is compared with that of a PI controller (PI) tuned by the regular loop-shaping method. The results show that when the SCR is above 10, the performance of both controllers is equivalent. However, lowering of the SCR compromises the performance of the system with PI and it becomes underdamped at SCR < 2. On the contrary, the system with the RPI is capable of maintaining the nominal performance throughout the same SCR decrease.

Suggested Citation

  • Clint Z. Ally & Erik C. W. de Jong, 2021. "Obtaining Robust Performance of a Current fed Voltage Source Inverter for Virtual Inertia Response in a Low Short Circuit Ratio Condition," Energies, MDPI, vol. 14(17), pages 1-18, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5546-:d:629424
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    References listed on IDEAS

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    1. Changjun Zhang, 2017. "Improving power and stability," Nature Energy, Nature, vol. 2(10), pages 765-765, October.
    2. Yingjie Wang & Jiashi Wang & Wei Zeng & Haiyuan Liu & Yushuo Chai, 2018. "H ∞ Robust Control of an LCL-Type Grid-Connected Inverter with Large-Scale Grid Impedance Perturbation," Energies, MDPI, vol. 11(1), pages 1-19, January.
    3. Yin Sun & E. C. W. (Erik) de Jong & Xiongfei Wang & Dongsheng Yang & Frede Blaabjerg & Vladimir Cuk & J. F. G. (Sjef) Cobben, 2019. "The Impact of PLL Dynamics on the Low Inertia Power Grid: A Case Study of Bonaire Island Power System," Energies, MDPI, vol. 12(7), pages 1-16, April.
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