电网故障下直驱式风电机组建模与控制仿真研究

Simulation study of modeling and control of direct drive wind turbine under grid fault

为分析直驱式永磁同步风电机组在电网故障时的联网运行特性,建立了风轮机、永磁同步发电机及全功率变流器的数学模型,构建了风轮机转速控制模型、PWM背靠背变流器控制模型及桨距角控制模型。在电网电压降落、风电场邻近母线单相短路接地、三相短路接地故障时联网风电场的暂态过程进行仿真分析,仿真结果表明所建模型是合理的、控制方法是有效的,为进一步研究新疆电网含大规模风电场的电力系统稳定性分析奠定基础。

In order to analyze the performances of directly permanent magnet synchronous generator wind turbine connecting to the grid under grid fault,the mathematic models of wind turbine,p ermanent magnet synchronous generator（PMSG）,a nd all-power inverter are built;t he control methods of rotor speed of wind turbine,PWM back-to-back converter and pitch angle are presented.T he transient characteristics of on-grid wind farm is simulated when grid voltage sag,single-phase short-circuit ground fault and three-phase ground fault happen on bus nearby wind farm.The simulation results show that the models and control methods are correct and valid.It lays a foundation for studying voltage stability on Xinjiang grid including large scale of wind farm in future.