微电网中带蓄电池的DFIG动态模型仿真

Dynamical simulation on DFIG with a fuel cell in the micro-grid

通过分析双馈电机的数学模型,建立了基于定子磁链定向矢量控制的双馈异步风力发电机模型,并且在其转换器直流侧加入蓄电池,在风力不足和大电网发生故障时给转换器转子侧或电网侧注入功率。以一个20 kV电源等效电网模型建立微电网系统,利用电力系统分析软件PSCAD/EMTDC分别对不带蓄电池的风力发电机和带蓄电池的风力发电机进行仿真。仿真结果表明,该控制方式能够实现双馈式异步风力发电机的有功、无功解耦。在变换器侧加入蓄电池,可改善电网质量,当负荷产生波动时能提高电压稳定性,还节约了变频器资源,节省了开支。

This paper analyses the mathematical model of the double-fed motor,proposes a dou-bly-fed induction generator（DFIG） based on the directional vector control of stator flux,and the storage battery is connected across the DC link of the converters injecting power either into the ro-tor or the grid circuit when the wind is insufficient and a fault occurs in the grid.A voltage source of 20kV is taken as the equivalent power grid model,establishes a micro-grid system.With the power system analysis software PSCAD/EMTDC for simulating DFIG with storage battery and DFIG without storage battery respectively,the results show that the control can realize the active and in-active decoupled control.Adding a storage battery by the converters can improve power quality,and voltage stability when the load fluctuation occurs.Meanwhile,the cost of the converters is saved to some extent.