摘要：分析了扰动电压输出条件下的光伏最大功率跟踪系统构成，使用基于变步长电压扰动法作为功率/电压寻优控制器。设计了一种光伏MPPT系统电压复合控制器，采用光伏输出电压预调节控制+电压环PI调节器的方法实现。通过对光伏输出电压控制器进行数学建模得到电压闭环传递函数，确定了最佳预调节系数及PI调节器参数以得到快速稳定的MPPT控制，仿真分析了控制器阶跃响应及波特图。仿真以及试验结果表明此电压复合控制器能够快速、稳定的实现光伏MPPT响应。
关键词：光伏最大功率点跟踪；电压复合控制器；数学模型；电压预调节；比例积分器

Abstract: The photovoltaic MPPT system structure based on voltage perturbation method was analyzed, variable step voltage perturbation method was used as the power / voltage optimization controller. The PV output voltage preset adjustment plus PI regulator method was used to design a composite controller of PV MPPT system. Obtained voltage closedloop transfer function through the establishment of the PV output voltage controller mathematical model. To get fast and stable MPPT control, the best voltage preset adjustment coefficient PI controller parameters were calculated, simulation analysed step response and Potter chart. The simulation and experimental results indicate that this compound controller of voltageloop can quickly achieve a stable photovoltaic MPPT response.
Key words: PV MPPT; voltage composite controller; mathematical model; voltage preset adjustment ; PI regulator