恒电压结合牛顿法的光伏系统MPPT控制

Constant Voltage Tracking Combined with Newton Method MPPT Control for Photovoltaic System

该文以提高跟踪速度、减少最大功率点附近功率振荡和减少误判为多重目标,提出了恒电压结合牛顿法的最大功率点跟踪策略,并利用朗伯W(LambertW)函数在光伏电池实用模型的基础上对其原理进行了理论推导和证明。该方法仅依赖于当前工作点的信息计算下一工作点的参考电压,有效地减少了误判;借助于牛顿法的良好收敛性,速度和稳定性都有提高。通过三种不同光照模式算例,与传统方法进行仿真对比,验证了方法的有效性。

This paper proposed a novel multi objective maximum power point tracking （MPPT） strategy com- bined constant voltage tracking and Newton method in order to improve tracking speed, minimize the power oscillation near maximum power point （MPP） and reduce erroneous results. A theoretical derivation and a demonstration＇based on practical photovoltaic （PV） cell model were also given by using LambertW function. The proposed method only uses the information of the actual working point to calculate the reference voltage of the next working point, thus the erroneous result is thus reduced. With the help of Newton method＇s good con- vergence, the proposed method shows a better tracking speed and less oscillation. Numerical simulations were conducted based on various radiation types to test the effectiveness of the proposed method. The results vali- date its effectivity and efficiency.