光伏阵列拓扑结构对系统输出的影响

摘要

Study the effect of topology structure of PV array on the system output. For partial shadow leads to pho-tovoltaic array mismatch phenomenon, and then reduces the output power greatly, even causes hot spot effect to de-stroy the whole battery. Parallel bypass diode can maintain the system output power partly, and the output character-istic curve of PV array contains multiple peaks. To improve the system output power, considering the PV array topolo-gy layout, we compared their output of six different topology structure groups when the outside conditions change, put forward an optimal topology structure, and used particle swarm ( PSO) algorithm to track the maximum power point. Modeling with MATLAB, simulation results show that the optimal topology structure is affected by partial shadow slightly, the maximum output power can be obtained, PSO algorithm can track the maximum power point quickly, and the output power of PV power generation system can be improved, which provides the basis for PV modules design.%研究光伏阵列拓扑结构对系统输出的影响。针对局部阴影会造成光伏阵列失配现象,进而使输出功率大幅度降低,严重时导致热斑效应毁坏整个电池组。并联旁路二极管解决局部阴影问题能在一定程度上维持系统输出功率,且光伏阵列的输出特性曲线含多峰值。为提高系统输出功率,从光伏阵列拓扑结构布局出发,对比6组不同拓扑结构在外界条件发生变化时系统的输出,提出一种最优拓扑结构,并通过粒子群( PSO)算法跟踪最大功率点。通过在MATLAB中建立模型,并进行仿真,结果表明,最优拓扑结构受局部阴影影响最小,可获得最大输出功率,PSO算法能快速跟踪到最大功率点,提高了光伏发电系统的输出功率,为光伏组件设计提供了依据。