基于模式阻尼法的风火打捆系统次同步扭振分析

Analysis of Subsynchronous Torsional Vibration in Wind Thermal Bundled System Based on Mode Damping Method

针对风电机组风火打捆系统的次同步振荡问题,以双馈风电场接入火电机组串补系统为研究对象,在双馈风电场不引发次同步振荡的情况下,基于模式阻尼法定量分析不同控制参数、运行工况、并网机组数量的双馈风电场接入前后火电机组轴系扭振作用。研究结果显示双馈风电场的接入使得火电机组各轴系扭振模式的衰减系数均减小,有利于缓解火电机组的轴系扭振。构建EMTDC/PSCAD仿真算例系统,检验了理论分析结果的确切性。

In response to the problem of subsynchronous oscillation in the wind thermal bundling system of wind turbines,this study takes the doubly fed wind farm connected to the series compensation system of thermal power units as the research object.Under the condition that the doubly fed wind farm does not cause subsynchronous oscillation,the mode damping method is used to quantitatively analyze the torsional vibration effect of the thermal power unit shaft system before and after the connection of the doubly fed wind farm with different control parameters,operating conditions,and the number of grid connected units.The research results show that the connection of doubly fed wind farms reduces the attenuation coefficients of torsional vibration modes in various shaft systems of thermal power units,which is beneficial for alleviating shaft torsional vibration of thermal power units.A simulation model is built in EMTDC/PSCAD to test the accuracy of the results.