大型并网直驱风电机组动态建模及稳定性仿真

摘要

The accurate structure of variable speed constant frequency(VSCF) of permanent magnetic synchronous generator (PMSG) unit is presented and the dynamic mathematical model of VSCF permanent magnetic synchronous generator unit in d-q coordinate system is set up. The simulation modules for VSCF permanent magnetic synchronous generator unit are built up and the dynamic stability of the permanent magnetic synchronous generator connected into power grid is simulated by use of MATLAB/Simulink. The results of simulation indicate that the established model is correct. By adopting variable speed technology, the utilization rate of wind energy can be greatly enhanced and power system stability can also be improved. Permanent magnetic synchronous generator (PMSG) unit has the performance of low voltage ride through(LVRT).%本文建立了包含变频器的直驱风力发电机组在d-q坐标系下的动态数学模型，基于MATLAB下的Simulink模块建立了用于动态仿真的并网型直驱发电机组动态模型，最后对直驱机组进行了动态稳定性仿真。结果显示：电网故障发生时，直驱风电机组发出无功功率，为电网提高无功支撑，从而在故障解除后电网电压能够快速恢复正常；直驱风电机组有低电压穿越能力；当发生故障或干扰时，直驱风电机组有功、转子侧电容电压波动不大且能够在故障或干扰解除时快速恢复正常。