【摘要】 随着数字化技术的发展,电流相位差动保护可以得到进一步的应用,特别是降低广域差动保护对精确同步采样的依赖。信息量大导致通信裕度降低是实现广域继电保护的难点。为降低系统通信量,并保证保护的灵敏度和可靠性,提出了一种基于分相电流突变量(简称ΔI)相位比较原理的广域继电保护故障元件识别算法。结合该算法在广域继电保护中的实现,阐述了分相ΔI启动算法、基于补偿电压过零点的同步校正方法以及采样点比对的相位差动策略及其配置于广域继电保护中的应用方案等关键问题。仿真结果表明该算法具有原理简单可靠、动作速度快、灵敏度高等优点,且能够适应高阻接地、非全相运行、故障发展及故障转移等复杂故障工况。更多还原

【Abstract】 Current phase differential protection is attracting new concern with the development of digital technology, which also reduces the dependency of wide area current differential protection on precisely synchronized sampling. The low communication margin stems from more measurement information, which is difficult to realize wide area protection. This paper proposes a novel wide area protection algorithm based on the phased comparison of segregated current fault component to decrease communication range and assure the sensitivity and reliability of the protection. Combining the engineering application, the paper elaborates some key issues including segregated phase start algorithm, the synchronization method based on offset voltage zero crossing point, the phase differential strategy of sampling site comparison, and the application scheme. The example analysis on IEEE 39 nodes system shows the algorithm has superior performance and adapts to the complexity of the high resistance grounded, open-phase operation, fault development and fault transfer.更多还原