基于离散波形变换的相互连接传输系统中断裂导体故障的识别
Basem Abd-Elhamed Rashad1, Doaa K Ibrahim2, Mahmoud I Gilany2
1Department of Electrical Power and Machines Engineering, The Higher Institute of Engineering at El-Shorouk City, El-Shorouk Academy, Cairo, Egypt.
PloS one
|January 12, 2024
概括
一个新的单端方案可以准确检测相互连接的电力系统中的断电导体故障 (BCF) 和高阻抗故障. 该方法使用过渡电流特征和定向元件,提供快速可靠的保护,无需通信.
科学领域:
- 电气工程 电气工程
- 电力系统保护保护 电力系统保护
- 信号处理 信号处理
背景情况:
- 相互连接的高温传输系统需要先进的保护,以防止故障,如断电导体故障 (BCF).
- 传统的距离继电器由于电流/电压变化最小而难以检测BCF,而地球断层继电器则导致延迟和错误运行.
- 现有的保护方案对多终端线路缺乏准确性和速度,影响系统稳定性.
研究的目的:
- 提出一种新的单端方案,用于检测相互连接的高温传输系统中的BCF和道高阻抗故障 (SHIF).
- 开发一种防护方案,克服传统中继在检测BCF方面的局限性.
- 在没有中继通信的多终端线路中实现准确的故障检测和选择性.
主要方法:
- 使用离散波形变换 (DWT) 来从当前信号中提取暂时特征.
- 基于选择性的短暂功率极性分析实施故障定向元件.
- 分析空中和地面模式当前峰值之间的时间差异,以进行故障歧视.
主要成果:
- 拟议的方案准确地检测所有类型的BCF和SHIF.
- 该方案在多终端线路中实现了精确的选择性.
- 缺陷检测可以在快速24.5毫秒内实现.
- 该方案在IEEE 9-Bus系统上的模拟中证明了有效性,稳定性和可靠性.
结论:
- 新的单端方案有效地检测了相互连接的高温传输系统中的BCF和SHIF.
- 该方案提供快速,可靠和选择性的保护,不需要通信或同步.
- 这种方法为加强现代电网保护提供了强大的解决方案.
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