摘要
介绍了光伏电源系统的特性及最大功率点跟踪的基本原理,根据其输出功率曲线的单峰性,提出了一种基于系统稳态模型的改进爬山法太阳能电池最大功率点跟踪控制方法,即将太阳能电池和C′uk斩波电路作为一个整体,直接根据检测到的负载功率变化来控制C′uk电路的占空比来跟踪最大功率点,这些改进使得系统简化。实验结果表明,该系统在日照强度、环境温度及负载电阻大范围变化时仍然能够快速、准确地跟踪到太阳能电池的最大功率点,并具有较好的稳定性。
Photovoltaic power system's characteristics and the mechanism of maximum power point tracking (MPPT) and (C~′uk) converter are introduced in this paper. Based on the one-peak characteristics of PV module's power output, a novel DSP-based, improved hill-climbing MPPT system is presented. It looks PV module and (C~′uk) converter as a whole and directly controls the duty cycle of the (C~′uk) converter according to the load power change to realize MPPT. This method is based on the static model of the (C~′uk) converter and PV module, so it can reduce the system complexity largely, is easy to realization and can warrant high system efficiency. The main differences between this method and the other methods are such, as short-current measuring, fuzzy controller, artificial neural network controller and power mathematics model. The experimental results show that the proposed system can track MPP quickly, exactly, and steadily, irrespective the large-scale change of irradiation intensity, circumstance temperature and load resistance.
出处
《电工电能新技术》
CSCD
2004年第3期76-80,共5页
Advanced Technology of Electrical Engineering and Energy
基金
上海市高等学校青年科学基金资助项目(03AQ83)
关键词
光伏电源
C′uk变换器
爬山法
最大功率点跟踪
photovoltaic power system
(C~′uk) Converter
hill-climbing method
maximum power point tracking
