《基于无损电阻的最大功率点跟踪控制方法的研究》由会员分享，可在线阅读，更多相关《基于无损电阻的最大功率点跟踪控制方法的研究（2页珍藏版）》请在金锄头文库上搜索。
1、摘 要随着传统能源的日益枯竭，太阳能已经成为一种十分具有潜力的新能源，而光伏发电是太阳能最重要的利用方式。但目前光伏发电并没有普及，原因在于其效率低、成本高。而且由于光伏电池输出特性受光照强度及环境温度影响很大，具有明显的非线性特性。这样就产生了最大功率点跟踪(Maximum Power Point Tracking，简称MPPT)的问题。本文就是在此背景下，对如何提升光伏电池效率进行重点研究。其具体实现思路如下：根据光伏电池的输出特性，将Buck-Boost型DC/DC变换器实现的无损电阻应用到最大功率点控制系统中，并结合爬山法的控制方式，使光伏发电系统在不同光照强度和温度条件下有效地跟踪最
2、大功率点。经MATLAB仿真验证，在不同光照强度及温度快速变化的条件下，基于无损电阻的最大功率点跟踪方法跟踪速度较快，而且追踪到最大功率后能稳定的工作在最大功率点附近。这样，不仅提高了效率，而且降低了传统方法中的不明干扰及错误判断。关键词：光伏电池；最大功率点跟踪(MPPT)；Buck-Boost；无损电阻AbstractWith the traditional energy depleting increasingly,PV power generation has bec-ome a new power which has great potential.But PV power gene
3、ration is not univer-sal,it is because that the efficiency of PV power generation is very low and the c-ost of it is very high.Because of the photovoltaic cells are affected by light intensi-ty and temperature,and its output show the nonlinear.So it produces a problem of Maximum Power Point Tracking
4、 (MPPT).Researching focus of this paper is that how to improvethe efficiency of photo-voltaic cells.The concreting realization of thinking show below.According to the out-put characteristics ofphotovoltaic cells,using the DC/DC converter of Buck-Boost toachieve loss-free resistance type applied to t
5、he MPPT control system.And using Per-turb&Observe control system make PV power generation system effectively track t-he maximum power point under the conditions of different light intensity and temp-erature Perturb and Observe.By MATLAB simulation validated, the maximum powerpo-int tracking method o
6、f loss-free resistance tracks more quickly. And when trackingtomaximum power point,it can work nearthe maximumpower point steadily.So it not onlyimproves efficiency,but also reduces unknown interference or misjudgment of the tr-aditional method.Keywords: PV power generation; MPPT; Buck-Boost; Loss-free resistance
