光伏阵列多峰特性情况下的最大功率点跟踪策略

MAXIMUM POWER POINT TRACKING STRATEGY OF PV ARRAY WITH MULTI-PEAK CHARACTERISTICS

提出引入超前滞后环节下最优分数阶极值搜索法的最大功率点跟踪(MPPT)策略,采用分数阶极值搜索法进行全局最大功率点的跟踪,利用分数阶微分理论下的极值搜索法克服传统极值搜索法动态性能的影响,同时引入超前滞后环节,改善分数阶极值搜索对系统整体稳定性和收敛性的影响。最后,通过Matlab/Simulink仿真与分析确定分数阶微分算子不同取值对系统的影响。进一步与传统扰动法以及传统极值搜索法进行比较,结果表明,在外部环境突变下该方法可快速稳定追踪到光伏阵列的最大功率点,提高光伏阵列整体输出效率。

In this paper, the maximum power point tracking(MPPT)strategy of the optimal fractional order extremum search method under the lead lag link is proposed. The global maximum power point tracking is realized by using the fractional order extreme value search method. The dynamic performance of the traditional extreme value search method is overcome by using the extreme value search method under the fractional order differential theory In order to improve the influence of fractional order extremum search on the global stability and convergence of the system, a lead lag link is introduced. Finally,through MATLAB/Simulink simulation and analysis, the influence of different values of fractional differential operator on the system is determined. Compared with the traditional perturbation method and the traditional extremum search method, the results show that this method can quickly and stably track the maximum power point of photovoltaic array under the sudden change of external environment,and improve the overall output efficiency of photovoltaic array.