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中文摘要：
日益复杂的电网迫切需要在线监控，而寻求简捷、有效的分析方法是在线监控得以实施的关键。静态功角稳定和电压稳定在本质上是统一的，根据二者极限处特性的关系，在相角和功率因数角δ -Ф空间上构造出静态稳定域，并在此基础上，提出一种以节点稳定裕度为目标的定量化切负荷快速计算方法。该方法采用量测量进行等值，间接避免了潮流计算和具体临界值的求取，从而弥补了传统方法在线应用中存在的系统规模过大、非线性模型不准确、计算速度慢的缺陷。仿真结果表明，该方法物理概念清晰、计算简单快速，有在线应用前景。
英文摘要：
With the increasing of power system complexity, the on-line monitoring and controlling become more and more important. Meanwhile, it is very crucial to achieve simple and direct methods for the on-line monitoring and controlling of power system. The angle stability and voltage stability are inherently united in nature. According to the relationship of their critical characteristic, a static stability region was constructed in the space of phase angle and power-factor angle （δ -Ф）. Based on this, a fast calculation method for quantitative load shedding was proposed, in which the node stability index was taken as an object. The method can indirectly avoid the calculation of power flow and specific critical value. Using measurement this method can also avoid the defects of traditional method in the aspects of system scale, accuracy of nonlinear model and speed of calculation. Simulation results show the validity of this method, which has explicit physical meaning, requires less computation work and has the prospect of application in real-time stability assessment and preventive control of power system operating condition.
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