【摘要】 最大功率点跟踪是提高光伏发电效率的关键技术之一。非均匀光照环境下,光伏电池输出特性曲线呈现多峰特性,容易陷入局部值或者误跟踪。为此,提出了均匀光照或者突变光照情况下Fibonacci的快速搜索算法和非均匀光照环境下串联和并联阵列多重区间的Fibonacci搜索算法。根据多照度水平下光伏阵列的模型和输出特性,采用电路分析法,串联阵列采用电流分析法,并联阵列采用电压分析法,确定输出控制量。MATLAB仿真结果表明,改进的Fibonacci算法在任意照度水平或光照变化条件都可以准确、快速、稳定地跟踪到阵列的全局最大功率点。更多还原

【Abstract】 Maximum power point tracking is one of the key technologies to improve the efficiency of photovoltaic power generation. The output characteristic curve of PV array exhibits multi-peak characteristics,which is easy to fall into local values or mistracking under the non-uniform illumination. A fast search algorithm for Fibonacci is proposed under uniform illumination or sudden changing sunlight. And Fibonacci search algorithm for multiple intervals of series and parallel arrays was used in non-uniform illumination environment. According to the photovoltaic array model and output characteristics of multi-illumination levels,the circuit analysis method was adopted to determine the output control quantity. The current analysis method was used in the series array and the voltage analysis method was used in parallel array. MATLAB simulation results show that the improved algorithm can track the global maximum power point of the array accurately,quickly and stably at any illumination level or changing sunlight condition.更多还原