光伏MPPT系统电压控制器的优化设计

分析了光伏MPPT系统构成及工作原理。使用基于变步长电压扰动法作为功率/电压寻优控制器。为实现快速稳定的光伏MPPT响应，重点对光伏输出电压控制器的电压环进行优化设计。设计了一种光伏MPPT电压复合控制器，采用电压顺馈+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PI调节器参数以得到快速稳定的MPPT控制。仿真分析结果以及试验结果表明，此电压复合控制器能够快速、稳定地实现光伏MPPT响应。

Optimized design of the voltage controller of PV MPPT system

The photovoltaic MPPT system structure and working principle are analyzed. Variable step voltage perturbation method is used as the power/voltage optimization controller. In order to achieve fast and stable PV MPPT response, this paper focuses on the optimized design of the voltage-loop of PV output voltage controller. The voltage feed-forward compensation plus PI regulator method is used to design a composite voltage controller of PV MPPT. Voltage closed-loop transfer function is obtained through the establishment of the PV output voltage controller mathematical model. To get fast and stable MPPT control, the best PI controller parameters are calculated. The simulation results and experimental results indicate that this compound controller of voltage can quickly achieve a stable photovoltaic MPPT response.