基于支路势能的电力系统强迫功率振荡特性分析

Research on Forced Power Oscillation Characteristics Based on Branch Potential Energy

我国电网已经发展成为规模庞大的交直流混联大电网,电网规模扩大的同时意味着电力系统中不稳定因素的增加,我国电网中发生了多次功率振荡事件并且呈现出新的振荡特性,但是根据负阻尼转矩机理却无法解释这类振荡产生的原因,研究表明强迫振荡源的存在是该类振荡产生的根本原因。根据电力系统自身的能量结构构建支路势能函数,通过发生强迫功率振荡过程中系统能量在系统中的分布情况研究强迫功率振荡的振荡特征,仿真结果验证了该方法的实用性和有效性。

Power grid in China has been developed into a large-scale ac-dc hybrid power system. The expansion of the grid size means that the uncertainties increase, and power oscillation has occurred frequently in the grid which presents some new characteristics. However, it is proved that forced oscillation source is the fundamental reason for the existence of the power oscillations, which are triggered off by non-negative damping mechanism. Branch potential energy function is constructed based on the energy structure of the power system, and then the oscillation characteristics are analyzed by means of the transient energy distribution. Simulation resuhs certify the practicality and feasibility of this method.