基于Prony辨识的复杂交直流系统次同步振荡特性分析

电力系统中的次同步振荡是一类严重的系统稳定性问题,不但会使系统产生振荡现象,而且极易造成汽轮发电机组的大轴损毁,准确分析系统的次同步振荡特性对其防止和抑制有重要意义.以往提出的基于系统线性化方程求解的小扰动分析方法在实际复杂系统中的应用非常困难,极易形成"维数灾".为解决上述问题,使用Prony辩识技术分析次同步振荡模式的方法,对2008年贵州电网这一复杂交直流混合输电系统的次同步振荡特性进行了分析,并且提出了提高辩识精度的有效方法,NETOMAC电磁暂态仿真计算证明了此方法的有效性.对今后复杂交、直流输电及含有FACTS装置的灵活交流输电系统的次同步振荡特性分析提供了可行途径,为抑制次同步振荡的阻尼控制器的设计提供了参考.

Subsynchronous Oscillation Analysis Based on Prony Identification Method

Subsynchronous oscillation is a serious stability problem that can exist in a power system. It can not only cause power oscillation in the system, but also cause shaft fatigue and possible damage or failure of the generator involved. Previous SSO analysis methods based on linear system equations had a lot of defects or were even impossible in engineering application. For these reasons,a prony identification method was developed to get the reduced order linear opened loop model of the complex hybrid HVDC/AC transmission systems. As comparison, both the transient torque simulation method and prony method were used to analysis 2008 Guizhou power system in the time and frequency domain. The analysis result shows that the certain operation conditions can cause Subsynchronous oscillation. With the method the characters of Subsynchronous oscillation of complex HVDC/AC transmission systems and large AC system with FACTS devices can be analyzed accurately.