风电系统振荡模式对DFIG-PSS传递函数的灵敏度分析  

Sensitivity analysis of the oscillation modes to the transfer function of DFIG-PSS in a wind power system

作　　者：李生虎[1,2] 张浩 LI Shenghu;ZHANG Hao(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;Anhui Provincial Laboratory of Renewable Energy Utilization and Energy Saving,Hefei 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽合肥230009 [2]安徽省新能源利用与节能省级实验室,安徽合肥230009

出　　处：《电力系统保护与控制》2020年第16期11-17,共7页Power System Protection and Control

基　　金：国家自然科学基金项目资助(51877061)。

摘　　要：在双馈感应风电机组(DFIG)上装设电力系统稳定器(PSS),有助于抑制电网低频振荡。建立含DFIG-PSS传递函数的风电系统状态方程,提出振荡模式对DFIG-PSS传递函数灵敏度的解析表达。考虑传递函数非线性,提出将特征值增量引入传递函数增量并迭代运算以提高传递函数灵敏度精度。为抑制振荡模式,利用传递函数灵敏度优化DFIG-PSS参数。结果表明:相比特征值对控制参数的灵敏度,对传递函数灵敏度可更准确分析模式变化;引入特征值增量减小了传递函数灵敏度的误差;基于传递函数灵敏度优化的DFIG-PSS能有效抑制低频振荡。The low frequency oscillations of the power system may be damped by a Power System Stabilizer(PSS)installed at the Doubly-Fed Induction Generator(DFIG).Based on the state equations with the transfer function of the DFIG-PSS,the analytical expression of the functional eigen-sensitivity with respect to the transfer function of the DFIG-PSS is proposed.Considering the nonlinearity of the transfer function,the eigenvalue increment is introduced to the iterative calculation of the transfer function increment to improve the accuracy of the functional eigen-sensitivity.To damp the oscillation modes,the parameters of the DFIG-PSS are optimized based on the functional eigen-sensitivity.The numerical results show that the accuracy of the functional eigen-sensitivity is higher than that of the parametric eigen-sensitivity,the error of the functional eigen-sensitivity is reduced with the introduction of the eigenvalue increment,and the low frequency oscillations are effectively damped by the DFIG-PSS which is optimized based on the functional eigen-sensitivity.

关 键 词：风电系统 DFIG PSS 低频振荡 特征值灵敏度 传递函数 

分 类 号：TM712[电气工程—电力系统及自动化] TM614