电网故障下直驱永磁风力发电机的无功功率控制策略  

Reactive Power Control Strategy for Direct-Driven Permanent Magnet Synchronous Wind Power Generation System under Fault in Power Grid

作　　者：郭春杰[1,2] 袁越[1,2] 邹文仲[1,2] 傅质馨 

机构地区：[1]河海大学能源与电气学院,南京211100 [2]可再生能源发电技术教育部工程研究中心,南京210098

出　　处：《电网与清洁能源》2012年第9期73-78,共6页Power System and Clean Energy

基　　金：国家自然科学基金(项目批准号:51077041)~~

摘　　要：直驱永磁同步风力发电系统(Directly driven wind turbinewith Permanent Magnet Synchronous Generators,D-PMSG)因具有结构简单、发电效率及运行可靠性高等优点已经逐渐成为风力发电的主流机型。随着风电场规模的逐渐增大,风力机的低电压穿越能力(Low Voltage Ride Through,LVRT)已经成为大型风电场并网的必备条件。文中针对电网故障下直驱永磁风力发电机的无功功率出力问题,采用在电网故障阶段并联备用变频器以及无功优先的控制方法,在电压跌落期间充分利用变频器的无功产生能力,使风力发电系统在故障期间迅速增加无功功率的输出,提升机端电压,帮助电网电压恢复,从而增强了直驱永磁同步风力机的低电压穿越能力。Compared with the other types of wind-power generation system,the direct-driven permanent magnet synch-ronous(D-PMSG) wind-power generation system has the advantages of simpler structure,higher generation efficiency and good operation reliability.Thanks to these advantages,the D-PMSG has become a major type of wind-power generation.However,with the integration of large wind farms to the power grid,the capability of low voltage ride through is more and more important.Considering the D-MSG's output of reactive power in the period of the grid fault,this paper presents a control method of paralleling the backup converter in the stage of power system fault and optimizing the reactive power.Simulation results prove that the reactive power of grid can be supported by the parallel converter,which improves the grid voltage and enhances the LVRT ability of D-PMSG.

关 键 词：直驱永磁同步风力机 无功补偿 低电压穿越 并联变频器 

分 类 号：TM614[电气工程—电力系统及自动化]