Dynamic Maximum Power Point Tracking

Contemporary society is increasingly high demands for energy, green energy demand is growing. At present, the use of green solar energy is very broad, from solar water heaters, solar panels, solar lamps. The big world of green energy solar power has become an integral part of it. The solar power technology has become an important part of the world consisting of green energy. Efficient application is now researchers have been pursuing the goal of the entire PV system, solar photovoltaic cells and photovoltaic conversion control technology is the photovoltaic system technology in two important technologies. Maximum power point tracking photovoltaic conversion control technology is one part. Therefore, the research and application of the maximum power point tracking technology has important theoretical and practical value.Maximum power point tracking (Maximum Power Point Tracking) referred MPPT technology, which is the output of main curve of the solar cell at a time will be the maximum power output, it is necessary to find the point that in many areas of technology convergence, the PV array design to modeling, power optimization techniques, as well as power electronic conversion technology and modern control technology, researchers at photovoltaic applications have generally adopted the second MPPT technology, but in practice there is still a lot of problems, requiring continue to research new technology to solve these problems.Obvious problem is the power mismatch problem, because of the uneven sunlight and shelter shadowing effect, causing the output curve of the solar cell is changing in real time. The maximum power point is dynamic, when receiving a large external impact is small photovoltaic power outputs, when the photovoltaic cells are connected in series will take a small bus current generation principle, will not only affect their The output will affect the output of other photovoltaic cells, resulting in power mismatch, good maximum power output of solar panels can not, ultimately, a way to transfer heat out of the hot spot effect occurs, this is a serious waste of energy, for Solar battery life is also greatly affected. It requires a combination of power optimization technology will soon be distributed energy again applied again, this can improve the efficiency of energy conversion.This paper introduces a new dynamic maximum power point tracking technology that will power equalization and maximum power point tracking combining design capable of controlling tandem photovoltaic cell systems. Bus voltage detected by the real-time current, the step-up/down circuit by the power control to achieve the conversion of the energy distribution of high energy to low energy photovoltaic solar cells, and finally the dynamic maximum power point tracking, avoiding thermal spot effect, improve the overall power output of the PV array in series.