交直流混合系统低频振荡的概率特征根分析

Probabilistic Eigenvalue Analysis for Low Frequency Oscillation of AC/DC Parallel Systems

研究低频振荡的传统特征根方法是基于单一的系统运行方式,而概率特征根分析则计及了较宽的系统运行方式变化。高压直流输电HVDC是一种典型的柔性交流输电FACTS装置,它可以改善系统的动态特性。将现有的概率特征根分析扩展到包含HVDC功能模块,能完成交直流混合系统的概率特征根分析。对四机两区域的交直流并联系统在选定的控制器参数下进行试算,结果表明,系统在多运行方式下研究交直流混合系统的低频振荡是可行的。

The traditional eigenvalue methods for low frequency oscillation problem are based on a single system operating condition. However, wider scale of power system operating condition variation can be taken into account with the probabilistic eigenvalue analysis. HVDC is one typical FACTS device, which can improve the system dynamic characteristics. The current probabilistic eigenvalue analysis is extended to the AC/I）C hybrid systems including the HVDC modules in this paper. The approach is tested on a four-machine two-area AC/DC parallel system under the selected control parameters. Results show that it is feasible to study the low frequency oscillation problem for AC/DC hybrid system with variant system operating conditions.