基于PSCAD的2MW双馈风力发电机组低电压穿越能力研究

Research on Low Voltage Ride-through Capability of 2 MW Doubly Fed Wind Turbine Based on PSCAD

随着以变速恒频双馈异步发电机为主体的大型风力发电机组在电网中所占比例的迅速提高,电力系统对并网风机在外部电网故障,特别是电网电压跌落下的不间断运行能力提出了更高的要求。首先介绍了德国EON风力发电系统低电压穿越标准,在定子磁链定向的基础上推导了双馈风力发电系统的有功无功解耦控制策略,最后在PSCAD中建立了具有Crowbar保护电路的2 MW双馈风力发电系统模型。仿真结果表明双馈风力发电系统具有很好的电压风穿越能力,正常运行状态下能够实现单位功率因素运行。

Along with the proportion of large wind power generators with doubly fed induction generators（DFIG） as main party in the power system increasing rapidly, the power system for the grid fan in the external power grid failure, especially under the network voltage drop continuous operation capacity has reached a higher requirements. In this paper, the German E.ON standard of wind power systems low voltage ride-through （LVRT） is introduced firstly, then the active and reactive power decoupling control strategy of doubly fed wind power generation system based on stator flux-oriented is derived, and finally a 2 MW DFIG system model with Crowbar protection circuit is established in PSCAD. The simulation results show that the DFIG system has a good LVRT capability and can achieve unit power factor operation in normal working conditions.