介绍硅太阳能电池Matlab/Simulink仿真模型，通过该模型得到太阳能电池模型的输出特性曲线和最大功率点跟踪(maximum power point tracking, MPPT)曲线;其次介绍MPPT原理，对传统的扰动观察(perturbation and observation, P&O)法进行研究，提出一种基于功率斜率曲线的判断标准.基于改进的变步扰动法，利用Matlab/Simulink工具，建立相应的电池控制模块，最后给出仿真曲线.该方法能够适应光强和温度的快速变化，快速跟踪最大功率点，比传统的扰动观察法更好地满足跟踪速度和跟踪稳定性的要求.

Computer simulation for the silicon solar cells is established using Matlab/Simulink. The output characteristics and maximum power point tracking (MPPT) curve are calculated. A new criterion based on the traditional perturbation and observation (P&O) method is given, with which a control module of solar cells is designed. Simulation results indicate that this module can adapt to the rapid changes in temperature and light, track the maximum power point much better than the traditional methods in speed and stabilities.