基于虚拟相量直线的戴维南等值参数计算方法

Calculation method of Thevenin equivalent parameters based on virtual line in phasor space

由于传统戴维南等值参数求取方法存在参数漂移等缺点,提出一种基于虚拟相量直线的戴维南等值参数识别方法。提出虚拟相量直线的概念,利用直线相交原理得出小扰动下电力系统的戴维南等值参数。为克服参数漂移和提高算法的收敛速度,利用阻抗轨迹圆法进行数据筛选。典型3机9节点系统的仿真结果表明,所提方法可以有效、准确地跟踪戴维南等值参数。

Since the traditional calculation method of Thevenin equivalent parameters has the shortages,such as parameter drift,an identification method of Thevenin equivalent parameters based on virtual line in the phasor space is proposed. The concept of virtual line in the phasor space is proposed. The linear inter-section principle is adopted to derive the Thevenin equivalent parameters of power system with small disturbance. In order to overcome the parameter drift and improve the convergence speed of the algorithm,the impedance locus circle method is used for data screening. The simulative results of a typical 3-generator 9-bus system show that the proposed method can effectively and accurately track Thevenin equivalent parameters.