Abstract
ABSTRACTA low-power grid-connected photovoltaic (PV) power generation system based on automatic solar tracking is designed in this paper. In order to increase the level of accuracy of automatic solar tracking, the part of automatic solar tracking adopts the method of hybrid tracking and uses pin-cushion two-dimensional position sensitive detector plus four silicon PV cells as the photosensitive element. An adaptive topological structure of the main circuit based on a cascaded Boost converter circuit and the H6-type inverter topology are designed for the system to obtain a better working condition. Then an MPPT algorithm combined modified constant voltage algorithm with modified variable step-size increment conductance algorithm is proposed in order to improve the efficiency of PV power generation. The experimental results showed the effectiveness of the control system. Finally, the hardware and software of the system are also designed. Moreover, a graphic interface made with the LabVIEW software allows the user to monitor and save the data in a file.
Highlights
IntroductionA new challenge of power production is the reduction of fossil fuel in the half-century
Solar energy is an important renewable energy owing to its advantages of non-pollution and wide geographical distribution (Kannan & Vakeesan, 2016; Racharla & Rajan, 2016; Sonkar, Edla, & Gupta, 2013)
We designed a low-power grid-connected PV power generation system based on automatic solar tracking, in which a pin-cushion two-dimensional position sensitive detector (PSD) was used as the photosensitive element
Summary
A new challenge of power production is the reduction of fossil fuel in the half-century. To obtain more output power of PV cells, the automatic solar tracking is a better choice. Zheng and Zhang (2012) utilized a charged coupled device (CCD) to track the sunlight accurately It has the disadvantages of high cost and low measurement speed. We designed a low-power grid-connected PV power generation system based on automatic solar tracking, in which a pin-cushion two-dimensional position sensitive detector (PSD) was used as the photosensitive element. To obtain more output power of PV module, combined the improved constant voltage algorithm with the modified variable step-size incremental conductance algorithm, an improved MPPT algorithm was proposed, which compensated for the shortcomings of the single algorithm and increase the tracking speed.
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