一种光伏电源的双模MPPT控制及应用

A dual-mode MPPT control and application of photovoltaic power

针对现有光伏电源效率低、输出电能不稳定、应用范围小等问题,提出了一种基于变步长扰动观察法/固定电压法双模控制方法的新型光伏电源方案。其中变步长扰动观察法具有良好的稳态性能,但对外界环境突变时跟踪速度不够理想,为此引入具有良好动态性能特性的固定电压法实现双模MPPT控制。Matlab仿真结果表明该方法能够快速、准确地跟踪光伏阵列的最大功率点,减少了在最大功率点振荡的能量损失,并能实现外界环境突变等恶劣条件下的最大功率点跟踪。基于本文方法的新型光伏电源具有良好的应用前景。

For the low efficiency and unstable output power and small applications range of the existing photovoltaic power supply,a new scheme was proposed using dual-mode control algorithm of variable step perturbation and observation/constant voltage method.The tracking speed of the variable step perturbation and observation method with good steady-state performance was not quick enough when the outside condition changed,so,the constant voltage method with good dynamic performance characteristic was introduced to realize the dual-mode MPPT control.The MATLAB simulation results show that the validity of the algorithm and the maximum power point tracking can be achieved quickly and accurately under adverse conditions such as the mutations of the external environment,and the energy loss of maximum power point oscillation is reduced.The new type photovoltaic power has good application prospect based on this method.