基于同伦函数的直驱永磁同步风电机组次同步振荡特征值分析

Eigenvalue Analysis on Sub-Synchronous Oscillation of Direct-Drive Permanent Magnet Synchronous Wind Turbine Generator Based on Homotopy Function

为了研究直驱永磁同步风电机组的次同步振荡问题,建立了典型的风电系统数学模型。在使用传统特征值分析法的基础上,利用同伦函数代替参与因子法,准确且直观地辨识出系统振荡模态特征值对应的状态变量。在此基础上进一步分析状态变量对应的参数对系统振荡模态特征值的影响。最后,通过PSCAD/EMTDC平台进行时域仿真。结果表明:直流电压控制外环积分系数和电流控制内环比例系数对系统的次同步振荡有很大影响。

In order to study the sub-synchronous oscillation problem of the direct-drive permanent magnet synchronous wind turbine generator,a typical mathematical model of wind power system was established.Based on the traditional eigenvalue analysis method,the state variables corresponding to the eigenvalues of system oscillation mode were identified intuitively and accurately by using the homotopy function instead of the participation factor method.On this basis,the influence of corresponding parameters of state variables on the eigenvalue of system oscillation mode was further analyzed.Finally,time domain simulation was carried out on the PSCAD/EMTDC platform.The results showed that the outer ring integration coefficient of DC voltage control and the inner ring proportionality coefficient of current control influenced the sub-synchronous oscillation of system greatly.