摘要
针对目前跟踪式太阳能光伏电池发电系统跟踪误差较大、抗干扰性较差、系统耗能较高等问题,融合大功率点追踪(maximum power point tracking,MPPT)和智能寻光感知技术设计了套太阳能光伏电池跟踪系统,实现了光电转化效率的大化。运用投影原理研制了寻光传感器,加入光强感测单元构成智能寻光感知模块,消除气候条件影响实现系统全天候的运行工作。为降低系统功耗,将跟踪方式设计为离散式,系统空闲时断电待机。对实现大功率点跟踪的扰动观察法进行优化改进,提出差别化扰动方式避免了扰动观察法在大功率点附近产生震荡及光强变化时的误动作。经实验验证,该系统跟踪分辨力可达到0.344?,系统误差小于2.5°,系统充电效率提高40%以上。
In allusion to such defects of current photovoltaic （PV） cell generation system adopting solar energy tracking technology as larger tracking error, weak anti-interference performance and higher system energy consumption, through integration of maximum power point tracking （MPPT） with intelligent light search perceptive technology an intelligent solar energy tracking system for PV cells is designed to implement the maximization of photon to current conversion efficiency. Utilizing the principle of projection a light search sensor is developed and adding light intensity sensing unit to the sensor an intelligent light search sensing module is formed to eliminate the affect of climatic conditions to implement the all-weather operation of the designed tracking system. To reduce the power consumption of the designed system, the tracking mode is designed as the discrete one, that is, after the necessary detection and control of such peripheral equipments as electric motor and its driving module, the light search sensing module and so on while the fixed clock signal arrives the designed system is in the standby status when the designed system is idle. The perturbation and observation method to implement the MPPT is improved and optimized, and a differentiation perturbation mode is proposed to avoid the oscillation near the maximum power point and malRmction during light intensity variation due to traditional perturbation and observation method. Experimental verification results show that the tracking resolution of the designed tracking system can achieve to 0.344°, the system error is less than 2.5° and the charging efficiency of the PV cells can be increased by more than 40%.
出处
《电网技术》
EI
CSCD
北大核心
2014年第1期87-92,共6页
Power System Technology
基金
黑龙江省自然科学基金重点项目(ZD201217977)~~
关键词
太阳能
光伏电池
最大功率点跟踪
寻光感知模块
离散式跟踪
solar energy
PV celt
maximum power pointtracking
light search perception module
discrete tracking
