Abstract—Present work deals with the analysis of aggregated
solar photovoltaic plants output (ASPV_op in kWh) (South
Africa) for the year 2015. The box plot of monthly ASPV_op has
shown lower values in winter and higher values in spring and
summer. The histograms have also been plotted to understand
the variation of ASPV_op in different seasons. The histograms
of ASPV_op have confirmed that it is not normally distributed.
Monthly variation of ASPV_op was similar to monthly surface
incident shortwave flux (SISW in Wm-2). Morlet wavelet has
been used for the investigation ASPV_op. The wavelet power
spectrum shows significant (at 5 % level) power concentration
between 2-16 days. Wavelet analyses of ASPV_op suggested that
days of mid-summer to early autumn have significant power
concentrated from 8 to 16 days band. In other seasons power is
concentrated almost less than 8 days. Almost all days of spring
have shown significant power concentration (< 8days).
Index Terms—Surface incident shortwave flux, photovoltaic
output, wavelet transform, Morlet wavelet, South Africa.
Jyotsna Singh, Lucky Ntsangwane, Joel Botai are with the South African
Weather Service, 442 Rigel Avenue South, Erasmusrand, Pretoria, South
Africa-0181 (e-mail: jsinghenv@gmail.com,
Lucky.Ntsangwane@weathersa.co.za, Joel.Botai@weathersa.co.za).
Bhishma Tyagi is with National Institute of Technology, Rourkela,
Odisha, India (e-mail: bhishmatyagi@gmail.com).
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Cite:Jyotsna Singh, Bhishma Tyagi, Lucky Ntsangwane, and Joel Botai, "Analysis of Aggregated Solar PV Output in South Africa," Journal of Clean Energy Technologies vol. 5, no. 4, pp. 378-382, 2017.
