Layout Method and Row Pitch Calculation for Mountain Photovoltaic Array

doi:10.12096/j.2096-4528.pgt.20005

Abstract

Abstract:

In recent years, there are more and more mountain photovoltaic projects. In order to select a suitable photovoltaic array layout method for mountain photovoltaic power stations, based on mathematical modeling, the geometric model of solar rays, slopes, and photovoltaic modules was established, the calculation methods for the theoretical row pitch of photovoltaic arrays at random slopes and azimuths were derived by using slope's azimuth-tilt layout and south-tilt layout, and the calculation of row pitch was more perfect by setting the judging conditions. By analyzing the results of row pitch under different latitudes, slopes, and azimuths on the slope surface, the rules and characteristics of the row pitch under the two layout methods were summarized and compared, which provided a direction and theoretical basis for designers to optimize the photovoltaic module layout in photovoltaic power stations.

Key words: mountain photovoltaic power station, slope's azimuth-tilt layout, south-tilt layout, row pitch of photovoltaic array

CLC Number:

TK 51

Geng LUO. Layout Method and Row Pitch Calculation for Mountain Photovoltaic Array[J]. Power Generation Technology, 2022, 43(2): 320-327.

Figures/Tables 11

Fig. 1 Mathematical model of solar rays

Fig. 2 Initial south-facing orientation of photovoltaic module and slope

Fig. 3 Mathematical model of photovoltaic module and slope under slope's azimuth-tilt layout

Fig. 4 Mathematical model of photovoltaic module and slope under south-tilt layout

Fig. 5 Variation curves of row pitch with slope azimuth at different latitudes and slopes (slope's azimuth-tilt layout)

Tab. 1 Effect of azimuth on peak sunshine hours

方位角/(°)	峰值日照时数	变化率/%
0	1 597	0
10	1 593	-0.3
20	1 580	-1.1
30	1 559	-2.4
40	1 529	-4.3
50	1 492	-6.6
60	1 450	-9.2
70	1 402	-12.2
80	1 349	-15.5
90	1 292	-19.1

Fig. 6 Variation curves of row pitch with slope azimuth at low and middle latitudes and different slopes

Fig. 7 Variation curves of row pitch with slope azimuth at high latitudes and different slopes

Fig. 8 Variation curves of row pitch with slope azimuth at different latitudes and slope (south-tilt layout)

Fig. 9 Comparison of variation curves of row pitch of two layout methods at the same latitude

Tab. 2 Azimuth corresponding to the row pitch at slope's azimuth-tilt layout is 5% greater than at south-tilt layout

纬度/(°)	坡度/(°)	组件倾角/(°)	方位角/(°)
20	20	38	12
20	10	38	37
35	20	38	8
35	10	38	23
50	20	38	5
50	10	38	8

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