风电场容量比对无功补偿容量的影响研究

摘要

由于扩建等原因,大规模风电场通常同时含有鼠笼式风力发电机和双馈式风力发电机.通过分析鼠笼式风机和双馈式风机的无功特性,研究了两种风机的容量比对混合风电场无功补偿的影响.并提出以临界容量比作为衡量混合风电场无功补偿容量的标准.当鼠笼机与双馈机的容量比小于或等于临界容量比时,混合风电场内部可以实现无功平衡,无需装设无功补偿设备；而容量比大于临界容量比时,混合风电场将从电网吸收感性无功,有必要对其进行无功补偿.最后利用PSCAD/EMTDC软件搭建了混合风电场模型,通过仿真验证了上述观点的正确性.%Due to the expansion or other reasons, large-scale wind farm usually contains both squirrel-cage induction generator (SCIG) and doubly fed wind generator (DFIG). This paper studies the impact of the capacity ratio of two types of wind farms on mixed wind farm's reactive power compensation by analyzing reactive power characteristics of SCIG and DFIG The critical capacity ratio is proposed to measure the reactive power compensation of the mixed wind farm. The mixed wind farm can achieve reactive power balance without equipped reactive power compensation instruments when the capacity ratio of SCIG and DFIG is less than or equal to critical capacity ratio. But the mixed wind farm absorbs inductive reactive power in the counterpart situation and it also needs reactive power compensation. Finally, PSCAD/EMTDC platform is applied to construct simulation model of the mixed wind farm to testify the above views.