分布式光伏阵列重构拓扑及控制方法

Reconfigure topology and control strategy of distribute photovoltaic array

针对光伏系统在实际运行时,阵列受局部阴影遮挡输出功率出现多峰值导致常规最大功率跟踪(MPPT)算法失效,以及低光照度时逆变器额定功率与接入光伏阵列功率不匹配导致运行效率降低这两个问题,将光伏逆变器组群控制和阵列组态优化思想应用到光伏阵列拓扑重构上,提出了一种新的逆变器出力方案和光伏阵列,可任意自由重构开关拓扑,分析了光伏阵列重构开关拓扑的数学模型及约束条件,利用动态聚类控制将光伏阵列进行了自由串并联并接入相应功率等级逆变器中。在Matlab上建立了光伏阵列及逆变器数学模型,并仿真运行了光伏阵列在局部阴影遮挡和低光照度运行条件下的拓扑重构,得到了串并联开关最优矩阵和光伏阵列输出总功率。研究结果表明,分布式光伏阵列重构拓扑极大地提高了光伏系统的输出功率。

Aiming at one problem that the ideal P-V characteristic of partial-shaded photovohaic array are modified and multi-peaks power output happened, so that common maximum power point tracking（MPPT） algorithms are failed, and the other problem that rated power of inverters are not match the output of pthtovohaic array on actual low light intensity working condition, a new inverter output scheme and a free reconfigurable switching topology were presented, mathematical model of photovoltaic array connection and constrains were analyzed. Dynamic clustering was used to control the topology to optimize the connection of pthotvoltaic array.The mathematical model of photovohaie array and inverters were developed in Matlab, reconfiguration process was simulated and series-parallel switch matrix was given under partial-shaded and low light intensity condition. The results indicate that reconfigure topology can improve the efficiency of distribute photovohaic array greatly.