一种优化的最大功率点跟踪变步长扰动观察法  

An Optimized Variable Step Size Perturbation and Observation MPPT Method

作　　者：朱圳[1] 孙以泽[1] 彭乐乐[1] 何月青 

机构地区：[1]东华大学机械工程学院,上海201620

出　　处：《水电能源科学》2014年第6期202-206,共5页Water Resources and Power

基　　金：中央高校基本科研业务费专项基金项目(CUSF-DH-D-2013055)

摘　　要：针对传统的大功率点跟踪(MPPT)扰动观察法中存在着稳态功率振荡及跟踪速度受步长影响较大的问题,设计了一种新的变步长扰动观察法,即步长的大小由前后两周期功率的变化值确定,当功率变化较大时取较大的扰动步长,反之则取较小的扰动步长,再在Matlab/Simulink平台中建立其仿真电路进行仿真测试,之后在实际的光伏系统中进行试验验证。结果表明,该方法能够在稳态功率振荡不变的情况下将跟踪速度提升66.7%,从而解决了传统扰动观察法的不足。As the traditional perturbation and observation （P＆O） method for maximum power point tracking （MPPT）,P＆O has the power oscillation at steady-state, and its tracking speed is significantly influenced by its step size. To solve the problems, a novel variable step-size P＆O MPPT algorithm is proposed in this paper. The step size is based on the changes of power, meaning a larger step is chosen while the change of power getting larger, otherwise choose a smaller step. The algorithm is experimented in the simulation circuit built in Matlab/Simulink. And then it applied to a real photovoltaic system. The experimental results show that the new algorithm can improve the tracking speed by 66. 70/40 while keeping the power oscillation at the same level, and solves the shortcomings of traditional P＆O effectivdy.

关 键 词：最大功率点跟踪 步长 扰动观察法 变步长扰动观察法 

分 类 号：TM615[电气工程—电力系统及自动化]