【摘要】 对光伏(PV)发电系统的PV模块组合方式进行研究,提出一种不均衡组串PV发电系统优化拓扑。该拓扑可根据各PV组串不均衡情况调整系统工作结构,通过将不均衡的组串从均衡的组串中分离出来,有效降低不均衡组串对系统的影响,从而提高PV发电系统的效率。而分离出的不均衡组串,其输出P-U曲线呈现多峰值现象,对此提出一种基于全局搜索的多峰值最大功率点跟踪(MPPT)优化算法。该方法能快速精确地追踪到系统的全局最大功率点(MPP),而无需增加硬件电路。仿真和实验结果表明提出的拓扑和优化算法能有效提高不均衡组串PV系统输出的效率。更多还原

【Abstract】 This paper investigates the architectures of photovoltaic(PV) modules in PV system,and proposes an optimizing PV topology under mismatching PV string condition.The proposed topology can change operation mode flexibly according to different mismatching degree of PV strings.By separating the mismatching PV string from matching PV strings,the effect of mismatching PV string on system can be reduced and system efficiency is improved.In addition,since multiple peaks can be exhibited on the power-voltage(P-U) characteristic curve for mismatching PV string,a multi-peak maximum power point tracking(MPPT) method based on global searching is presented,which can quickly and precisely track the global maximum power point and it is very convenient to combine this algorithm with conventional MPPT methods without additional circuit.Simulation and experimental results indicate the proposed topology and algorithm can improve the efficiency for the mismatching PV strings system.更多还原