基于节点戴维南等值的静态电压稳定裕度快速求解

Fast Estimation Method for Steady-state Voltage Stability Margin Based on Node Thevenin Equivalent

提出一种基于节点戴维南等值参数的静态电压稳定裕度的快速计算方法。通过建立戴维南内电势与负荷裕度的二次多项式模型及节点电压与负荷裕度之间的泰勒展开模型,运用电网基态的参数,求取该节点的戴维南等值参数。根据鼻形点所处的边界条件,导出负荷裕度与等值参数之间的内在联系,从而计算出研究节点的最大负荷裕度。不同于连续潮流计算方法和其他电力系统戴维南等值方法,该方法计算简单快速,能给出节点负荷水平,直观明了。应用这种戴维南等效电路方法计算节点负荷水平时,越是靠近电压稳定极限点,其计算结果越准确。IEEE14和IEEE30节点系统计算验证了此方法的正确性和实用性。

This paper presents a fast estimation method for steady-state voltage stability margin based on node Thevenin equivalent. Using the quadratic polynomial model between Thevenin equivalents and load margin, and the Taylor expansion model between node voltage and load margin, Thevenin equivalent parameters are calculated according to the parameters on the base status, The expression between load margin and Thevenin equivalent parameters is obtained on the basis of margin conditions. Different from continuous power flow （CPF） and other Thevenin equivalent methods, the proposed method is easy to implement with the rapid calculation speed, and it can give the critical load level, The method is proved to be more accurate when the base running point is heavily loaded. Tests on IEEE-14 and IEEE-30 systems verify the correctness and practicability of the proposed method.