稳定控制所用交流设备跳闸判据的分析及应用

电力系统安全稳定控制装置的动作行为直接影响电网的安全运行。对设备跳闸、尤其是交流输电线路跳闸的正确判断是稳定控制装置正确动作的重要前提。论述了用电气量判断输电线路跳闸的必要性，研究、分析了线路跳闸电气量的变化特征，以及潮流转移、失步振荡、低频振荡等动态过程中电气量变化与线路跳闸的区别；对目前使用的跳闸判据及有关判别条件的正确含义进行了解释，分析了现场运行中所出现的误判事件的原因，指出目前使用的跳闸判据的正确性；提出了防止误判跳闸的有效措施。文中讨论的内容将有助于澄清目前国内在这方面存在的分歧和认识方面的误解，以提高安全稳定控制系统运行的可靠性。

Analysis and Application of AC Fault Criterion in Power System Stability Control

Trip of the security and stability control equipment directly affects the safe operation of power systems, and the correct judgment to trip an AC transmission line offers an essential prerequisite for the correct trip of the SSC. This paper studies the characteristics of electric changes if the transmission line is tripped, and the differences of line trip from the characteristics in the dynamic process, e.g. power transfer, out-of-step, lower-frequency oscillation, etc. Based on the accurate implication of the current trip criterion and relevant assessing conditions, the paper also analyses the reasons of the mal-trips of SSC and puts forward effective measures of prohibiting the mal-trips, so as to upgrade the reliability of SSC.