Research on Shadow Mitigation Strategy for Sloped Photovoltaic Arrays Based on Environmental Parameter Model

doi:10.12096/j.2096-4528.pgt.23152

Abstract

Abstract:

Objectives The anti-shadow strategy plays a vital role in the large-scale application of photovoltaic systems. In order to cope with the problem of power generation loss caused by shadow shading between photovoltaic arrays in areas with low slope, it is necessary to optimize the daily tracking strategy of photovoltaic modules. Methods Taking a photovoltaic power station in Ningxia as an example, the dynamic shadow shading calculation model and irradiance model were established based on terrain and environmental factors. An anti-shadow flat single-axis solar tracking strategy was proposed. The feasibility and effectiveness of the proposed solution were tested using a simulation model constructed by MATLAB software. Finally,a typical sunny day was selected for field comparison and verification in the selected area. Results Under low-slope terrain conditions, compared with the photovoltaic array using the original tracking strategy, the photovoltaic array with the proposed anti-shadow and automatic tracking strategy can reduce shadow occlusion by about 12%. Additionally,the overall electricity output efficiency of the system can be improved by about 10%. Conclusions The proposed strategy is optimized from the perspective of terrain and environmental factors, which effectively solves the applicability problem of the anti-shadow tracking system, broadens the location area of photovoltaic power station, and provides reliable technical support for it, which is of great significance in the large-scale application of photovoltaic systems.

Key words: solar energy, photovoltaic power station, gently sloping terrain, shadow shading, tracking strategy, flat single-axis systems, power generation benefits

CLC Number:

TK 513.4

Bin HUANG, Wei ZHAO, Lida LIAO, Meng XIAO, Jialiang HUANG, Ke XING. Research on Shadow Mitigation Strategy for Sloped Photovoltaic Arrays Based on Environmental Parameter Model[J]. Power Generation Technology, 2025, 46(3): 579-589.

Figures/Tables 14

Fig. 1 Geography of the case location and information on the wind environment

Tab. 1 Basic parameters of PV modules

主要参数	数值
额定功率/W	365
短路电流/A	9.84
开路电压/V	47.85
组件转换效率/%	18.74
组件尺寸/mm	1 984×992×30
电池类型	单晶硅
跟踪角度/(˚)	-45~45

Fig. 2 Schematic diagram of flat single-axis system

Fig. 3 Flat single-axis mounting angle diagram

Fig. 4 Shading effect between gently sloping PV arrays

Fig. 5 Schematic diagram of foundation height difference between gently sloping PV arrays

Fig. 6 Schematic diagram for calculating shadow size of gently sloping PV arrays

Fig. 7 Control flowchart of anti-shadow tracking system

Fig. 8 Package architecture of simulation model

Fig.9 Dynamic G-β simulation curves for gently sloping PV arrays

Fig. 10 Comparison of simulation results before and after tracking strategy optimization

Fig. 11 Schematic of the control group of the PV array test at the case site

Fig. 12 Plot of all-day monitoring data for the PV array control test group

Fig. 13 Monitoring data of the control test group during 08:30-09:00 a.m.

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