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首页> 外文期刊>IEEE transactions on industrial informatics >Optimal Coordination of Double-Inverse Overcurrent Relays for Stable Operation of DGs
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Optimal Coordination of Double-Inverse Overcurrent Relays for Stable Operation of DGs

机译：DG稳定运行的双反向过电流继电器的最佳配合

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Due to the increasing penetration of distributed generations (DGs) in distribution networks, the performance of protective relays is becoming more critical to maintain the stability of the DGs especially during fault conditions. Among different types of DGs, squirrel cage induction generators (SCIGs) and synchronous DGs are sensitive to faults and might become unstable even after fault clearance. Since the fault clearing time depends on the overcurrent relays (OCRs) characteristic curves, this paper proposes a double-inverse OCR (DIOCR) characteristic to provide proper coordination while maintaining DGs stability. The proposed method defines the critical clearing time curve for each DG and combines them with DIOCRs curves and coordination time interval constraints for finding optimal DIOCRs settings. The proposed method is simulated on the IEEE 33-bus distribution network equipped with SCIG- and synchronous-based DGs. The obtained results highlight the capability of DIOCRs in protecting distribution system with DGs considering stability constraints.
机译：由于分布式发电（DG）在配电网络中的渗透率不断提高，保护继电器的性能对于维持DG的稳定性（尤其是在故障情况下）变得越来越重要。在不同类型的DG中，鼠笼式感应发电机（SCIG）和同步DG对故障敏感，甚至在清除故障后也可能变得不稳定。由于故障清除时间取决于过电流继电器（OCR）的特性曲线，因此本文提出了一种双反OCR（DIOCR）特性，以在保持DG稳定性的同时提供适当的协调。所提出的方法定义了每个危险品的临界清除时间曲线，并将其与DIOCRs曲线和协调时间间隔约束相结合，以找到最佳DIOCRs设置。该方法在装有SCIG和基于同步的DG的IEEE 33总线配电网络上进行了仿真。获得的结果突出了DIOCR在考虑了稳定性约束的情况下利用DG保护配电系统的能力。

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