Scholarlink

<p>The increasing integration of distributed generation units within microgrids has introduced new challenges for protection coordination, especially under changing grid configurations and islanding conditions. Conventional overcurrent protection systems, based on fixed relay settings, are often inadequate in multi-microgrid environments where fault current levels and network topology vary dynamically. This paper proposes an adaptive overcurrent protection scheme designed for a grid-connected network consisting of one main utility grid and three interconnected microgrids. The proposed strategy relies on real-time monitoring of key electrical parameters measured at both the Point of Common Coupling and individual microgrids. An islanding detection module identifies the number of active microgrids, allowing the algorithm to automatically select and update the appropriate relay settings. The pickup current is adjusted adaptively according to system status and the detected fault. The relays employ inverse-time characteristics depending on their location and coordination requirements. Extensive simulation studies are conducted using MATLAB/Simulink under different scenarios. Two operational cases are analyzed: normal local relay operation and intentional blocking to evaluate the adaptive relay response. Simulation results show that the adaptive strategy ensures high selectivity and rapid fault clearance, even when system topology or breaker status changes. The proposed approach enhances coordination between the main grid and microgrid relays.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Adaptive Overcurrent Protection Framework for Grid-Connected Multi-Microgrids with Dynamic Relay Coordination

  • 期刊论文

  • 发表日期：

    2026年4月2日

查看全文
  • Mohammed Tsebia,
  • Hamid Bentarzi,
  • Fazia Ahcene,
  • Djamila Talah,
  • Azeddine Ratni

摘要

The increasing integration of distributed generation units within microgrids has introduced new challenges for protection coordination, especially under changing grid configurations and islanding conditions. Conventional overcurrent protection systems, based on fixed relay settings, are often inadequate in multi-microgrid environments where fault current levels and network topology vary dynamically. This paper proposes an adaptive overcurrent protection scheme designed for a grid-connected network consisting of one main utility grid and three interconnected microgrids. The proposed strategy relies on real-time monitoring of key electrical parameters measured at both the Point of Common Coupling and individual microgrids. An islanding detection module identifies the number of active microgrids, allowing the algorithm to automatically select and update the appropriate relay settings. The pickup current is adjusted adaptively according to system status and the detected fault. The relays employ inverse-time characteristics depending on their location and coordination requirements. Extensive simulation studies are conducted using MATLAB/Simulink under different scenarios. Two operational cases are analyzed: normal local relay operation and intentional blocking to evaluate the adaptive relay response. Simulation results show that the adaptive strategy ensures high selectivity and rapid fault clearance, even when system topology or breaker status changes. The proposed approach enhances coordination between the main grid and microgrid relays.