摘要
针对具有大转动惯量和宽最大功率点跟踪(maximum power point tracking,MPPT)区间的风电机组,发现了一种在传统MPPT控制策略下出现的风机MPPT失效现象。基于对简化风机模型的平衡点及加速/减速区域的分析,从机理上解释了MPPT失效现象的产生原因,即风机的慢动态性能难以跟踪风速的快速波动。进一步,针对多种容量风电机组的仿真统计分析表明,该MPPT失效现象的发生及其对风能利用系数的降低是不能忽视的。特别是在高湍流强度的风速条件下,MPPT失效导致的风能捕获损失率可能高达10%以上。
A phenomenon of the invalidity of maximum power point tracking （MPPT） was discovered, which occurred in the MPPT stage of wind turbine systems with large inertia and wide MPPT range. Based on the analysis of equilibrium points and acceleration/deceleration regions of the simplified wind turbine model, the paper presented the mechanism explanation of the occurrence of the MPPT invalidity phenomenon that was the dynamic behavior of wind turbine was too slow to track the rapid variation of wind speed. Furthermore, the simulations of wind turbines with several capacities and statistics analysis showed that the occurrence of the MPPT invalidity phenomenon and its impacts on wind turbine efficiency could not be neglected. Especially at the wind speed conditions with high turbulence intensity, the MPPT invalidity phenomenon might reduce the captured wind power with a significant loss ratio of up to 10%.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第18期40-47,共8页
Proceedings of the CSEE
基金
南京理工大学自主科研专项计划资助项目(2010ZYTS052)~~
