电网暂态故障下风电机组动态载荷分析

Dynamic Load Analysis of Wind Turbine under Power Grid Transient Fault

随着风电规模化开发利用,电网暂态故障引起的风电机组疲劳损伤问题也越来越突出。针对风电机组机械和电气部分仿真模型简化的问题,基于联合仿真思想,建立了5 MW风电机组FAST与MATLAB/Simulink的联合仿真模型。研究分析了对称和不对称电压暂态跌落工况对风电机组机械动态载荷的影响机理和特性。仿真结果表明,电网电压暂态故障对风电机组叶尖摆振和塔架及主轴受力带来较大影响,增大了叶片、塔架和主轴等部件的机械疲劳载荷,尤其是在不对称跌落时更为显著,而叶尖挥舞及塔架振动加速度所受影响较小。研究结果也为后续进一步动态载荷抑制提供了理论基础。

With the large-scale development and utilization of wind power,power grid transient fault for the wind turbine fatigue damage problem is more and more prominent.For the problem of simulation model simplification of mechanical and electrical part of wind turbine,a co-simulation model for FAST and Matlab/Simulink of 5 MW wind turbine was established based on the idea of co-simulation.The impact mechanism and characteristics of mechanical dynamic load of wind turbine were researched and analyzed under symmetrical and asymmetrical voltage transient dip.The simulation results show that it is great impact on the blade tip flapwise acceleration and the force of the tower and the shaft of the wind turbine because of voltage transient dip.Mechanical fatigue load of blades,tower and shaft of wind turbine is increased,especially under asymmetrical voltage transient dip it is more pronounced,while blade tip edgewise acceleration and tower vibration acceleration are less affected.The results also provide a theoretical basis for further dynamic load suppression.