摘要
三相PWM逆变器是风力发电并网系统的主要部分,开发一种高性能的逆变器控制策略已经成为研究的重点。本文在对风力发电并网逆变器系统数学模型分析的基础上,提出了一种改进的矢量控制策略。它主要由两个双环控制模型构成,分别都是电流外环电压内环的结构。通过实时检测并网电流和电网电压的波动,有效的补偿并网电感的电压信号,就能够很好的补偿逆变器PWM调制波信号。本文提出的这种矢量控制结构不仅可以改善并网电流的波形质量,而且在系统给定参数发生变化的情况下,仍然可使系统具有很强的鲁棒性,此外,该结构还能有效补偿直流侧母线电压的脉动对并网电流质量的影响。
Developing a high performance control strategy is a significant point in three-phase PWM inverter, which is an important part of wind power generation. On the basis of analyzing the modeling of grid-connected inverter for wind power generation system, this paper proposes a novel vector control strategy, which consists of two dual-loop model, i.e. inner voltage loop and outer current loop. The PW＇M modulation signal of inverter can be effectively compensated by detecting real-time grid-connected cun＇ent and gird voltage, compensating vaiidly the voltage crossed the grid-connected inductance. The vector control strategy proposed can not only improve the quality of grid-connected current, but also maintain an excellent robust at the change ＇of system parameters. Moreover, the strategy proposed can compensate effectively the effect of DC-link ripples to the quality of cun＇ent waveform.
出处
《变频器世界》
2007年第8期51-55,共5页
The World of Inverters
基金
国家"十一五"科技支撑计划"大功率风电机组研制与示范"课题编号:2006BAA01A21。
关键词
风力发电
逆变器
矢量控制
数学模型
并网
Wind power generation Inverter Vector control Modeling Grid-connected
