Maximum power point (MPP) Tracking, which is usually referred as MPPT, is a setup that forces the photovoltaic (PV) module to operate in such a way that the PV module will yield the maximum power, which in turn depend upon the solar illumination and surrounding temperature. Amidst all the MPPT designs, perturb & observe and incremental conductance (INC) algorithms are mostly selected due to easy implementation and good tracking credibility. The conventional MPPTs based on fixed step size give less power output and at every step tracking is required for new location due to random variation is a tedious job. In this paper the variable step size INC-MPPT technique is proposed which automatically tracks the next step size to maximize the power output. The comprehensive comparison is presented using MATLAB/SIMULINK between conventional and improved MPPT.

最大功率点（MPP）跟踪（通常称为MPPT）是一种设置，可强制光伏（PV）模块以这样的方式运行，即PV模块将产生最大功率，而最大功率又取决于太阳光和周围的温度。在所有MPPT设计中，由于易于实现和良好的跟踪可信度，因此大多选择了“扰动与观察”和“增量电导（INC）”算法。基于固定步长的常规MPPT会产生较少的功率输出，并且由于随机变化而在每一步都需要跟踪新位置，这是一项繁琐的工作。在本文中，提出了可变步长INC-MPPT技术，该技术可自动跟踪下一个步长以最大化功率输出。