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<p>This paper shows the relation between undervoltage protection requirements of Distributed Energy Resources (DERs) and the short-term voltage stability of the corresponding bulk power system, highlighting that the former may have a significant impact on the latter. The discussion of this relationship, as well as the proposal of a procedure to avoid potentially unstable systemic behavior, is the main contribution of this paper. A simplified model of distribution systems (which considers the undervoltage protection of DERs) is proposed, which can be viewed as a secondary contribution of this work. The paper explains the mechanism by which highly restrictive undervoltage settings may result in successive disconnections of distributed generators after a disturbance in the bulk power system. The successive disconnection of DERs can be considered a type of cascading failure that ultimately leads to short-term voltage instability. Based on this finding, the paper proposes a procedure to evaluate and/or adjust undervoltage protection settings of DERs to prevent the aforementioned cascading disconnection. As previously stated, the proposal of this procedure is a key part of the main contribution of this work. The procedure is based on Monte Carlo simulations and was successfully applied to an IEEE benchmark system.</p>

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Short-Term Voltage Stability Analysis Considering the Mandatory Disconnection of Distributed Energy Resources

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Jhonatan A. dos Santos,
  • Jessica M. Binotto,
  • Artur B. Piardi,
  • Ahda P. G. Pavani,
  • José Carlos M. Vieira Junior,
  • Rodrigo A. Ramos

摘要

This paper shows the relation between undervoltage protection requirements of Distributed Energy Resources (DERs) and the short-term voltage stability of the corresponding bulk power system, highlighting that the former may have a significant impact on the latter. The discussion of this relationship, as well as the proposal of a procedure to avoid potentially unstable systemic behavior, is the main contribution of this paper. A simplified model of distribution systems (which considers the undervoltage protection of DERs) is proposed, which can be viewed as a secondary contribution of this work. The paper explains the mechanism by which highly restrictive undervoltage settings may result in successive disconnections of distributed generators after a disturbance in the bulk power system. The successive disconnection of DERs can be considered a type of cascading failure that ultimately leads to short-term voltage instability. Based on this finding, the paper proposes a procedure to evaluate and/or adjust undervoltage protection settings of DERs to prevent the aforementioned cascading disconnection. As previously stated, the proposal of this procedure is a key part of the main contribution of this work. The procedure is based on Monte Carlo simulations and was successfully applied to an IEEE benchmark system.