机电暂态仿真中振荡中心的识别方法及应用

An Oscillation Center Identification Method and Application in Electro-mechanic Transient Simulation

中国电网已经发展成为规模较大的互联电网,在故障冲击后,可能引起区域之间的功率振荡。在电力系统仿真分析中经常需要识别振荡区域、确定振荡中心,进而判断系统的薄弱区域并采取有效的调整控制措施。机电暂态仿真中自动识别振荡中心能够为计算分析提供重要参考,具有重要的应用价值。根据低频振荡过程中振荡中心电压有效值最低的特点,研究了根据线路两侧电压进行振荡中心计算的方法;与网络分析方法相结合,研究了机电暂态仿真过程中振荡中心断面的自动分析方法。该研究成果已在PSD-BPA机电暂态程序中实现。通过对实际电网的计算分析,阐述了振荡过程中振荡中心的变化特点和规律以及如何利用这些识别系统薄弱环节、判断系统稳定状态。所提出的方法能够有效识别实际电网的振荡中心,从而为实际电网的计算分析以及后续分析方法的研究开发奠定基础。

China power grid has become one large scale interconnected network; the power system fault may cause inter-area power oscillation. It is usually necessary to identify the oscillation areas and the oscillation center in the power system simulation, based on which we can find the weak area and the control measure. In the electromechanical transient simulation, oscillation center automatically finding function can provide important information for the power system analysis and has great application value. According to the characteristics that the oscillation center voltage is the lowest, the paper studied the oscillation center computation method using the line voltage. Combined with network analysis method, the paper studied the oscillation center analysis method in the electromechanical simulation. The research result has been applied in PSD-BPA transient stability program. Based on the actual grid simulation and analysis, the paper uncoverd the dynamic change process and characteristics of the oscillation center, and how to identify power system weak areas and judge the stability state base on them. The analysis method can effectively find the oscillation center of actual systems and has important role in the power system simulation and other analysis method study.