基于双模MPPT的光伏发电控制策略研究

Study of Control Strategy of Photovoltaic Power Generation Based on Dual Mode MPPT

提出一种结合拉格朗日二次插值法和最优梯度变步长3点比较法的双模式最大功率点跟踪(MPPT)控制方法,该方法用于光伏发电系统可避免扰动观测法产生的电压振荡及误判造成的功率损失,同时可以改善恒压法不能随环境条件实时调整工作电压的缺陷。仿真与实验结果表明该方法的有效性。

A dual mode maximum power point tracking （MPPT） control method is proposed, which combines the Lag- range quadratic interpolation method and optimal gradient variable step three-point method.This method used in pho- tovoltaic power generation system avoids the power loss caused by voltage oscillation and misjudgment when using perturb ＆ observe algorithm and overcomes the shortcomings that operation voltage can not be adjusted with enviro- nment change when using constant voltage tracking.Simulation and experiment show the validity of the proposed method. Keywords：photovohaic power generation; maximum power point tracking; interpolation method