灵敏度法求取戴维南等效参数的静态电压稳定分析

Analysis for Static-state Voltage Stability Based on Obtaining Thevenin Equivalent Parameters with Sensitivity Method

在戴维南等效模型基础上提出了一种求戴维南等效参数的新算法。该方法利用节点分压原理在初始状态下和在有功功率扰动下列方程组。由于该方程组是线性的,解时不需要迭代,不需要传统算法的两点或者多点潮流数据,计算量小。在负荷节点进行戴维南等效,利用电压灵敏度求得戴维南等效参数以后,利用阻抗模裕度和负荷裕度指标进行了静态电压稳定性分析。在IEEE-30和IEEE-57节点系统验证了该方法的正确性和有效性。

A new algorithm of calculating Thevenin equivalent parameters is proposed based on Thevenin equivalent＇s model. Making use of node voltage partial pressure principal both on initial status and active power disturbance status, equations set can be listed. This equations set is linear, which can be sloved without iterating and flow datas of two or more points as conventional algorithm. It is less computation. After using Thevenin＇s equivalent on load nodes and gaining Thevenin equivalent parameters by using voltage sensitivity, stability a- nalysis of static--state voltage is proceeded by using resistance module margin and load margin indicators. Tests on IEEE 30--bus and IEEE 57-bus systems verify the correctness and practicability of this method.