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Reserach on VSG LVRT Control Strategy of Photovoltaic Storage Microgrid

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Abstract

To enable photovoltaic storage microgrid to support system frequency and voltage without disconnecting from power grid during power grid faults, an improved VSG low voltage ride through(LVRT) control strategy is proposed. Firstly, the transient characteristics of VSG are analyzed under short circuit fault. Secondly, the active power and reactive power loop are redesigned, the improved VSG control strategy is established. Meanwhile, short-circuit fault reference current is set to prevent the fault current from exceeding the limit. Finally, a simulation model of improved VSG LVRT control strategy is established for simulation tests. The test results show that improved VSG LVRT control strategy can not only achieve active power compensation to support power angle recovery during voltage sag fault, but also achieve reactive power compensation, effectively support voltage recovery, suppress voltage sags. Meanwhile, it has better effect of restraining short circuit current, to improve system transient stability. To further verify the feasibility of this method, it is applied to photovoltaic storage microgrid. The feasibility of this method is verified by setting up application scenarios for single-phase and three-phase short-circuit faults in the power grid.

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All data are available from the corresponding author on reasonable request.

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Funding

National Key R&D Technology Projects, Grant Number SQ2022YFB2400136.

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Authors and Affiliations

  1. School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo, 255000, China

    Zuobin Zhu & Shumin Sun

  2. Department of New Energy, Electric Power Research Institute of State Grid Shandong Electric Power Company, Jinan, 250000, China

    Zuobin Zhu, Shumin Sun & Yiyuan Liu

  3. Department of Power Dispatching Center, Rizhao Power Supply Company of State Grid Shandong Electric Power Company, Rizhao, 276800, China

    Yueming Ding

Authors
  1. Zuobin Zhu
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  2. Shumin Sun
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  3. Yueming Ding
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  4. Yiyuan Liu
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Correspondence to Zuobin Zhu or Shumin Sun.

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Zhu, Z., Sun, S., Ding, Y. et al. Reserach on VSG LVRT Control Strategy of Photovoltaic Storage Microgrid. J. Electr. Eng. Technol. (2024). https://doi.org/10.1007/s42835-024-01895-8

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  • DOI: https://doi.org/10.1007/s42835-024-01895-8

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