一种集成于线路保护的失步判别新方法  

New Method of Out-of-step Protection Integrated in Line Protection

作　　者：张洪喜[1] 王紫薇 沈军[1] 赵青春[1] 朱晓彤[1] ZHANG Hongxi;WANG Ziwei;SHEN Jun;ZHAO Qingchun;ZHU Xiaotong(NR Electric Co., Ltd., Nanjing 211102, China;School of Electric and New Energy, China Three Gorges University, Hubei Yichang 443002, China)

机构地区：[1]南京南瑞继保电气有限公司,南京211102 [2]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《高压电器》2018年第4期233-238,共6页High Voltage Apparatus

摘　　要：通过对电力系统异步运行状态特征的研究,提出一种集成于线路保护的失步判别新方法。该方法由3部分元件组成:失步起动诊断元件、失步区域判断元件和失步跳闸时机选择元件。失步起动诊断元件利用系统两侧的功角差和功角滑差判断电力系统是否开始发生失步。失步区域判断元件利用线路保护中距离保护Ⅱ段的起动信息判断失步解列的区域。失步跳闸时机选择元件通过Ucos原理统计失步次数,并利用功角差作为辅助判据来选择最佳跳闸时机。当3个元件同时动作时,失步保护动作将系统解列。该方法准确可靠且不受系统运行方式影响。通过RTDS仿真实验,验证了该方法的可靠性。Based on the study of characteristics of the asynchronous operating power system, this paper provides a new method of out-of-step protection. This new method consists of three components： starting detection of out-of-step element, region judgment of out-of-step element and trip opportunity selection of out-of-step element. The first ele- ment uses the differential angle and slip angle between two ends to determine whether power system begins to oscil- late. The second element uses the signals of zone II of the distance relay to judge the oscillation area. The third ele- ment uses Ucos principle to count the number of out-of-step, and use differential angle as an auxiliary criterion to se- lect the best opportunity to trip. When these three elements operate at the same time action, the out-of-step protec- tion will operate immediately. The method is accurate and reliable and is not affected by the system operation mode. The reliability of the method is verified by RTDS simulation experiment.

关 键 词：失步保护 滑差dδ/dt 距离保护 Ucos原理 RTDS仿真实验 

分 类 号：TM773[电气工程—电力系统及自动化]