双馈风力发电机次同步扭振研究

Sub-synchronous torsional interaction analysis of doubly-fed wind generator

为了解决风电机组中的次同步振荡(SSO)问题,针对双馈风力发电机组经串连补偿并网发生的次同步扭振(SSTI)问题展开了分析。首先简要介绍了双馈风机(DFIG)中发生SSTI形成的原因。推导建立了DFIG各个部分的小信号分析模型方程,联立方程形成全系统线性化方程。然后通过模态分析得到了SSTI的特征值,并计算出SSTI的相关因子,进而讨论了SSTI与转子侧参数、次同步扭振与风速的关系。通过模态阻尼比与MATLAB/SIMULINK时域仿真分析SSTI问题,验证了风速是否为影响SSTI的因素。

In order to solve the problem of sub-synchronous oscillation（SSO） of the wind turbine,the problem of sub-synchronous torsional interaction（SSTI） induced by the double-fed wind farm via series compensation is studied. Firstly,the mechanism of the sub-synchronous torsional interaction of doubly fed induction generator（DFIG） are introduced. A small signal analysis model is established for each part of DFIG to form a linear equation of the whole system. Then,the characteristic value,frequency and feature vectors of the sub-synchronous torsional interaction are obtained by modal analysis. and obtained the participating factors of SSTI. Next,the relationship between the subsynchronous torsional interaction and the parameters of the rotor side parameters and the wind speed are discussed. Finally,the sub-synchronous torsional interaction problem is analyzed by mode damping ratio and Matlab/simulink simulation,and whether the wind speed is the factor that affects the sub-synchronous torsional interaction is verified.