以双馈风力发电系统(doubly-fed induction generator based wind energy conversion system,DFIG-based WECS)为例,利用小信号分析法推导出由风机、双质量块传动链构成的动力与传动系统通用传递函数方程.动力与传动系统传递函数的零极点位置、稳定性与系统参数及系统运行工作点相关.该传递函数可进一步分解为扭转分量和非扭转分量.传动链参数仅对扭转分量造成影响.在此基础上,建立了考虑动力传动、电机、变流器、控制等环节的风力发电系统传递函数模型.模型综合了各环节参数,可直观反映系统参数对系统响应的影响,有助于深入了解系统动态行为.算例及时域仿真结果证明了所提出传递函数模型的准确性和高效性,可为系统参数设计研究提供理论依据.
Modeling of DFIG-based Wind Energy Conversion System With Transfer Function Analysis
The dynamical and drive system of a doubly-fed induction generator-based wind energy conversion system(DFIG-based WECS)including wind turbine,two-mass drive train is represented using a compacted transfer function based on small signal analysis.The poles and zeros of transfer function are related to parameters of WECS,as well as operating point.The resulting transfer function can be further resolved into two terms:non-torsional term and torsional term.From the transfer function description,it can be readily seen that the shaft parameters,(i.e.,shaft stiffness and damping ratio)only affects the torsional term.Furthermore,a transfer function model,which covers drive system,doubly-fed induction generator,power electronic and control system,is developed.The transfer function model provides an in-depth insight into the systemic behavior of DFIG-based WECS.On the other hand,it offers guidelines for design of system parameters.Test studies validate the assertions and demonstrate the application of the methodology.
transfer functiondoubly-fed induction generator based wind energy conversion system(DFIG-based WECS)small signal analysisdynamical and drive system model
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