一种采用同步相量的新型配电网断相检测方法
A Novel Open Phase Detection Method with Synchronized Phasors for Distribution Systems
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中文总结 AI 辅助
本文提出一种基于同步相量计算连接阻抗的新型配电网断相检测方法，适用于闭环馈线或带DER的场景，抗反向馈电干扰，易部署且可靠。
中文摘要 AI 辅助
有效的断相检测是电力公司尚未解决的挑战之一。断相检测需在电力线路落地前检测到断线，以防止野火起火。现有断相检测方法通常基于断相事件后三相不平衡产生的异常电流或电压。对于带有多个分支的复杂配电馈线，基于电流的方法保护范围有限，而基于电压的方法可能因反向馈电在断相处重新产生电压而失效。本文提出一种新的断相检测方法，该方法基于两个测量点的连接阻抗，通过同步相量计算得到。在内部断相工况下，计算得到的正序阻抗远大于其他工况下的阻抗，且符号为负。该新方法适用于闭环配置的配电馈线，或负载侧连接了DER（分布式能源资源）单元的场景，几乎不受反向馈电的影响，仅需点对点通信，可轻松在现有重合器控制器或RTU（远程终端单元）中实现，具有可扩展性、成本效益高且可靠的特点。
英文摘要
An effective open phase detection is one of the unsolved challenges for utilities. Open phase detection is expected to detect the broken power line before it falls to the ground, to prevent the ignition of wildfires. The existing open phase detection methods are normally based on abnormal currents or voltages due to three phase unbalances after open phase events. For a complicated distribution feeder with multiple branches, current-based methods usually have a limited protection range, and voltage-based methods possibly failed due to the recreated voltage on the open phase due to back-feed. This paper presents a new open phase detection method based on the connection impedance of two measuring points, which is calculated with the synchronized phasors. Under an internal open phase condition, the calculated positive-sequence impedance is much larger than the impedance under other conditions, and its sign is negative. This new method is applicable for a distribution feeder with a closed-loop configuration, or DER units connected at the load side. It is almost not impacted by back-feed. This new method only requires point-to-point communication. This method can be easily implemented in the existing recloser controllers or RTUs. It is scalable, cost effective, and reliable.
