基于d-q变化的双馈风力发电系统损耗功率研究与控制优化

Research on Power Loss in Doubly-fed Wind Power Generation System Based on d-q Transformation and Its Control Optimization

基于d-q变化的定子磁场定向矢量控制广泛应用于变速恒频双馈风力发电中,但大部分研究的热点集中变频器的控制策略上。文章从研究降低双馈发电机损耗功率入手,发现通过控制发电机磁链可以有效降低铜耗、铁耗、机械损耗和杂散损耗。重新搭建了损耗功率模型,解耦电磁转矩、有功和无功功率的与定转子电流及转子角速度的关系,并在此基础上提出一种新的最大功率点跟踪控制策略(MPPT)。

Stator field-oriented vector control based on d-q transformation is widely used in wind generation with doubly fed in- duction generator （DFIG）, but most of the research focuses on the control strategy of frequency converter. According to the research of reducing the loss power of doubly fed induction generator, it is found that the copper consumption, iron loss, mechanical loss and stray loss can be effectively reduced by controlling the generator flux linkage. The loss power model is re-established to decou pie the relationship between the electromagnetic torque, active power, reactive power and the stator/rotor current and rotor angular velocity. Based on this, a new maximum power point tracking （MPPT） control strategy is proposed.