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针对传统时域仿真法分析暂态稳定性速度慢,且不能提供稳定程度信息的问题,提出一种基于相轨迹凹凸性的时域仿真快速终止算法.在分析了相轨迹凹凸性在系统暂态过程中的变化特征的基础上,由轨迹几何特征定义了系统的暂态稳定裕度指标.依据逐步时域仿真获取的轨迹信息,使用该指标评估系统后续摇摆的稳定性.对于后续摇摆稳定、不稳定的情况可提前终止仿真,对于尚不能确定后续摇摆稳定性的事件则继续仿真,直到满足稳定裕度指标要求或达到积分终止条件.通过IEEE 39节点10机系统仿真验证了所提算法的快速性和可靠性,对于提高暂态稳定分析效率具有很好的工程实用价值.“,”Time-domain simulation (TDS) for power system transient stability is inefficient and tedious,and it can't provide quantitatively stability margin.This paper proposed a novel TDS termination algorithm based on phase-plane trajectory convexity-concavity.After further analysis of phase-plane trajectory motion characteristics,the transient stability margin is defined based on phase-plane trajectory convexity-concavity.Combined with the traditional time-domain simulation,the stability of following trajectory can be evaluated according to the obtained trajectory information based on the proposed stability margin.The simulation can be terminated if the system is detected to be long-term stable and unstable,otherwise,the simulation should be continued until the termination criterion is satisfied.The proposed algorithm can improve off-line transient stability analysis of practical engineering,its efficiency and validity is verified by simulation results on IEEE 39-bus 10-unit system.