一种改进的变步长电导增量光伏电源MPPT控制方法

光伏系统的最大功率点跟踪方法可以最大限度地利用光伏电池所能产生的电能，因此成为提高光伏发电系统运行效率、降低光伏电能成本的研究热点。针对目前常用的扰动观察法速度较慢、电导增量法在最大功率点附近有较大振荡的问题，提出一种改进变步长电导增量的最大功率点跟踪控制方法，该方法既具有电导增量法快速跟踪的优点，又能准确、稳定地跟踪到最大功率点，因此更适于提高光伏电源的能源利用率。对所提方法进行了仿真分析，并比较了几种MPPT算法的跟踪效果，结果表明，所提方法具有快速性、稳定性和有效性。

An Improved Variational Step Incremental Conductance Control Method for Maximum Power Point Tracking in Photovoltaic System

The Maximum Power Point Tracking(MPPT) is designed to maximize electricity that photovoltaic cells produce,so as to improve photovoltaic power efficiency and reduce the photovoltaic power cost.Because the common perturbation and observation(P&O) runs at a low speed,and the incremental conductance(IncCond) suffers from a larger oscillations at the point of MPP,this paper proposes an improved variational step incremental conductance MPPT control method.The method not only has the advantages of the IncCond,but also quickly tracks the maximum power point more accurately and steadily,thus more suitable to increase energy efficiency in PV systems.MPPT control methods are simulated and compared in this paper,and the results verify the rapidity,stability and effectiveness of the proposed MPPT method.