摘要
针对多逆变器并联永磁直驱风力发电并网逆变系统运行中的环流问题,提出了共直流母线并联型永磁直驱风电并网逆变系统的环流抑制方法。建立了三相静止坐标系和同步旋转坐标系下的共直流母线并联型拓扑的平均模型,阐明了产生环流问题的根本原因,引入零矢量调节因子完成对空间矢量脉宽调制(SVPWM)零矢量作用时间的修正,在不增加硬件开销的基础上抑制了系统网侧环流,解决了不均流、波形畸变、三相不对称等问题,实现了永磁直驱风电变流器的共直流母线高可靠性并联运行。实验结果表明,该方法可实现双馈感应发电机(DHG)系统平滑、无冲击并网,保证了并网接入点的动、稳态电能品质。
For multiple parallel inverter permanent magnet direct drive wind power grid-connected inverter circulation problems, a common DC bus for parallel-type permanent magnet direct drive wind power converter control strategy of circulation is proposed.Respectively,in three-phase static coordinates and synchronous rotating refer-ence frame,a common DC bus for parallel topology of an average model is established, its problem of circulation is analyzed, the underlying causes circulation is explained, the circulation in the side and line-side loop are independent of each other is proved, so circulation in the side and line-side loop suppression can be carried out independently.Zero symmetric space vector pulse width modulation （SVPWM） strategy is designed,at no additional cost on the basis of curbing the circulation in the side and line-side loop solved is not current, thrce-phase asymmetric waveform distortion, and other issues, a permanent magnet direct drive wind power converter-parallel operation of DC is achieved.Experimental wave-forms show that this method can realize doubly-fed induction generator（DFIG） system sliding steady, no grid-connected and ensure the static and dynamic power quality of the grid-connected point.
出处
《电力电子技术》
CSCD
北大核心
2015年第8期93-96,共4页
Power Electronics
基金
国家自然基金面上项目(E070303)~~
关键词
风力发电
多逆变器
载波移相
环流抑制
wind energy generation
multiple inverters
cartier phase shift
loop current suppression
