摘要
光伏并网发电已成为目前发展最快、应用面最广的光伏能源应用技术。在光伏系统中,由于电池光电转换效率过低,导致其不能以最大功率输出,最大功率点跟踪(MPTT)是光伏并网发电系统中的核心技术。系统采用单片机ATmega128作为核心芯片输出SPWM信号,实现最大功率点跟踪功能、频率相位跟踪功能、输入欠压保护功能以及输出过流保护功能。结果显示,该系统不仅电路简单、控制灵活,而且光电转换效率高,提高了系统的整机发电效率。
PV grid-connected has become the fastest growing and most widely applied technology of photovoltaic energy presently.In photovoltaic systems,the low photoelectric conversion efficiency of photovoltaic cells results in that the photovoltaic cells can not reach maximum power output.Maximum power point tracking is the core technology of the grid-connected photovoltaic system.The system employed an ATmega128 as the core chip which produced SPWM signal,and the system realized many functions,such as maximum power point tracking function,frequency and phase tracking function,and the protection function of input voltage lack and output current overflow.The result shows that this system not only has simple circuit design and flexible control,but also can achieve the high photoelectric conversion efficiency,and improved the efficiency of system.
出处
《电子设计工程》
2011年第22期11-13,17,共4页
Electronic Design Engineering
基金
华南农业大学校长基金资助项目(2009K006)
