中文摘要：

为有效利用太阳能，光伏发电系统必须对光伏电池的最大输出功率点（MPP）进行跟踪。通过对现有的最大输出功率点跟踪（MPPT）算法进行比较研究，提出了一种结合恒定电压跟踪法的小步长电导增量算法，并对其进行Matlab仿真。仿真结果表明，该改进算法不但能快速跟踪MPP，动态性能好，而且对光照强度突变具有快速适应性，能更高效地利用太阳能。该算法的仿真研究对实际系统试验具有很好的指导作用。

英文摘要：

In order to effectively use solar energy, it is necessary for photovoltaic generation system to track the maximum output power point （ MPP） of the photovoltaic cells. The existing maximum power point tracking（ MPPT） algorithms are compared and researched, and the small step size incremental conductance algorithm combining with constant voltage tracking method is proposed, and the Matlab simulation is conducted. The results of simulation show that the improved algorithm can track the MPP quickly, features good dynamic performance, and fast adaptability for mutation of light intensity, thus the solar energy can be used more effectively. The simulation research on the algorithm offers excellent guidance to practical system experiments.