电网侧换流器无功功率控制改善双馈风电机组稳定性的研究

The Stability of Doubly-fed Induction Generator Based on Reactive Power Regulation Capability of Grid Side Converter

研究了改善双馈风电机组(DFIG)的并网风电场暂态稳定性的措施。目前现存的大部分双馈型变速风电机组并不具备故障穿越能力。在DIgSILENT/PowerFactory14.0中建立了具有暂态无功调节能力的变速风电机组电网侧换流器控制模型以及故障后桨距角控制模型,通过对并网风电场仿真分析验证了模型的有效性。仿真结果表明:当风电场电网侧发生短路故障情况下,双馈风电机组电网侧换流器能够产生一定的无功功率支持电网电压;桨距角控制能够降低风电机组的机械转矩,防止机组超速以及电压失稳。双馈风电机组的故障穿越能力得以实现。

Measures to improve transient stability of wind farms based on doubly fed induction generator（DFIG）. Most ex- istent variable speed doubly-fed generator are not equip with transient stability support ability during fault conditions. The grid side converter with voltage support ability and pitch control models are modeled in DIg SILENT/Power Factory14.0. The va- lidity of the models are verified by power system simulation in- cluding wind farms. Simulation results show that： the reactive power generator by grid side converter can support voltage fluc- tuation of PCC under fault condition; the pitch control reduce the mechanical power of the DFIG,prevent wind generator from over speeding. The fault ride through capability of DFIG is achieved.