TRACKING TRAJECTORY OPTIMIZATION OF PHOTOVOLTAIC ARRAY DUAL-AXIS BRACKET UNDER SHADOW OCCLUSION

Liu Daosheng; Qiu Huanjing; Yang Ruimin; Xie Fei; Yan Xuemei

doi:10.19912/j.0254-0096.tynxb.2024-1349

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (12) : 277-287. DOI: 10.19912/j.0254-0096.tynxb.2024-1349

TRACKING TRAJECTORY OPTIMIZATION OF PHOTOVOLTAIC ARRAY DUAL-AXIS BRACKET UNDER SHADOW OCCLUSION

Liu Daosheng¹, Qiu Huanjing¹, Yang Ruimin¹, Xie Fei¹, Yan Xuemei²

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Abstract

This paper proposes a backtracking trajectory optimization method to improve power generation for photovoltaic array that uses dual-axis bracket to track sunlight, which may cause the front and rear shadow during the sunrise and sunset period. Firstly, the real-time position of the sun and the time of sunrise and sunset throughout a whole day are calculated based on the SPA algorithm, with the SunCalc meteorological data being compared for verification. Then, the bracket rotation geometry model is established to derive and compare the backtracking and non-backtracking trajectories, and the shading ratio-power loss relationship formula under specific conditions is fitted based on the shadow shading experimental datum of a single photovoltaic component. To verify this formula, the peak power values corresponding to different sun positions, rotation angles and shading ratios are calculated based on the HDKR anisotropic irradiance model, which are compared with the measured values. Finally, to achieve backtracking trajectory optimization, the optimal rotation angle corresponding to the maximum power value is solved. The statistical result of the component's power generation and motor rotation power consumption throughout a whole day shows that the optimized backtracking trajectory reduces power loss and further improves power generation than that before being optimized, while the power consumption of the driver motor remains basically unchanged.

Key words

photovoltaic power / photovoltaic array / shadow occlusion / tracking / dual-axis / irradiance

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Liu Daosheng, Qiu Huanjing, Yang Ruimin, Xie Fei, Yan Xuemei. TRACKING TRAJECTORY OPTIMIZATION OF PHOTOVOLTAIC ARRAY DUAL-AXIS BRACKET UNDER SHADOW OCCLUSION[J]. Acta Energiae Solaris Sinica. 2025, 46(12): 277-287 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1349

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