摘要
在风力发电系统中,风力发电系统效率优化控制能实现风能向电能最大效率地转换,提高风能利用率。但是在实际风场中最大功率点会随风速的变化而转移,从而给最大功率的跟踪带来困难,利用变步长转速扰动爬山法实现最大功率的跟踪,针对爬山法追踪最大功率点过程中引起的搜索时间长、主动扰动易引起机械振荡等不足,提出残差修正的灰色理论预测下一个控制时刻的风速,来确定下一时刻最优功率点搜索的起始转速,再利用变步长转速扰动实现最大功率追踪,在最短的时间内搜索到最优功率点。仿真分析与研究表明,残差修正灰色理论对风速预测具有很好的效果,能够有效缩短最优功率点的搜索区间和搜索时间,可以为提高整机发电效率提供依据。
Efficiency optimization control（ EOC） of Wind-Turbine System can achieve the maximum conversion efficiency of wind energy to electrical energy,thus,raise the utilization rate of wind power. But the maximum power point can shift in the actual wind field along with the wind speed change. This paper presents a variable step power tracking method. To determine the starting speed of the optimal power point of next time,the method uses the differential correction of the gray theory to predict the next control point in wind speed. And then,the optimal power point is investigated in the minimum time by using variable step speed disturbance to achieve maximum power tracking.Simulation results show that the difference correction gray theory has a good effect on forecasting wind speed,which can not merely effectively shorten the search sector and search time of the optimal power point,but also improve the running efficiency of the whole machine.
出处
《计算机仿真》
CSCD
北大核心
2016年第2期142-146,152,共6页
Computer Simulation
关键词
风力发电
爬山法
残差修正
灰色理论
Wind turbine system
Hill climbing method
Residual error residuum
Gray theoretical
