Effect of Different Solar Radiation Data Sources on the Variation of Techno-Economic Feasibility of PV Power System

M.A. Alghoul a, b, *, Amer Ali c, F.V. Kannanaikal a, N. Amin d, A.A. Aljaafar c, Mohammed Kadhim c and K. Sopian d a Energy and Building Research Center, Kuwait Institute for Scientific Research, Safat 13109, Kuwait b Center of Research Excellence in Renewable Energy (CoRe-RE), Research Institute, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia c The School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia d Solar Energy Research Institute, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia *Corresponding author e-mail: dr.alghoul@gmail.com


INTRODUCTION
In the literature, numerous researches discussed the techno-economic feasibility of hybrid renewable power systems [1][2][3][4][5][6] or PV power systems [7][8][9][10] using HOMER simulation tool.Techno-economic feasibility studies in the literature variated in their input data resources due to many climate databases available online.However, effect of different data sources of solar radiation on the techno-economic feasibility of PV systems are still a missing link in the literature despite there are many research areas in the literature investigated the effect of different data sources on the outcome of their studies [11][12][13][14].Moreover, previous techno-economic feasibility studies usually dealt with a case study (a specific load for a respective location).Generalizing the outcome versus wide range of daily loads instead of a specific load is most effective.Therefore, the aim of this study is to enrich the literature with new research on the effect of different data sources of solar radiation on techno-economic feasibility of the PV power system versus wide range of daily loads.To success the verification, four data sources of solar radiation, different annual capacity shortages percentages (0, 2.5, 5, and 7.5) and wide range of daily load profile (10-100) kWh/day are implemented under Baghdad city location.

Materials and methods
Baghdad, Iraq's capital located at 33 o latitude and 44 o longitude.The monthly solar radiation from different data sources for Baghdad city is shown in Table 1.The solar radiation data sources are: Nasa climate site (SRC1) [15], weather base climate site (SRC2) [16], meteorological department data (Iraq) SRC3:   [17] and meteorological department data: (1962-1992) (Iraq) SRC4 [18].The variation of monthly solar radiation obtained from different data sources is plotted in figure 1.

E3S Web of Conferences 23, 01007 (2017)
The techno-economic feasibility parameters such as COE ($/kWh), PV array power capacity (kW), PV electrical production (kWh/year), No. of batteries, Battery lifetime (year) were simulated using HOMER.Then, the values of these parameters are compared to measure the significance of variation due to solar radiation from different data sources.Block diagram of the study evolution methodology is shown in Fig. 2.

SIMULATION RESULTS AND DISCUSSION
Figure 3 illustrates the effect of multiple data sources of solar radiation on COE of PV power system versus wide range of daily load profile (10kWh-100kWh) for different annual capacity shortage.It can be seen that different data sources leaded to obvious variation in COE values for each capacity shortage.Comparison between the effects of these solar resources specifies that SRC3 and SRC4 are the most diverging resources at all capacity shortages with a maximum deviation of 22%.SRC1 and SRC2 vary at 0% capacity shortage but later at higher capacity shortage values they tend to converge.At the low load range, higher and unstable COE values can be witnessed meanwhile at medium and higher loads, stable COE values can be found.This is attributed to the fact that the adopted components are considered oversize for small loads.For example, the analysis showed that the adopted battery type (RA12, 260Ah, 12V, 3.12kWh) in this study is found oversize when designing PV system of small load.
Figure 4 illustrates the effect of multiple data sources of solar radiation (SRC1, SRC2, SRC3 and SRC4) on PV array power capacity versus wide range of daily load profile (10kWh-100kWh) for annual capacity shortage (0% and 5%).
It can be perceived that different data sources of solar radiation lead to higher variation of PV array power at capacity shortage (0%) compare of that at capacity shortage (5%).
Figure 5 plots the effect of multiple data sources of solar radiation (SRC1, SRC2, SRC3 and SRC4) on PV electrical production versus wide range of daily load profile (10kWh-100kWh) for annual capacity shortage (0% and 5%).The results revealed that different data sources of solar radiation lead to significant variation of PV electrical production at annual capacity shortage (0%) while this variation vanished at capacity shortage (5%).Finally, effect of different data sources (SRC1, SRC2, SRC3 and SRC4) of solar radiation on battery lifetime at capacity shortage (0% and 5%) is shown in Fig 7(a-b) respectively.It is seen that different data sources of solar radiation leaded to significant variation in battery lifetime at capacity shortages 5% compare of that at capacity shortage 0%.

CONCLUSION
The outcomes from this study are drawn as below: • Solar radiation data from different data sources of Baghdad city caused variations in the values of the technoeconomic feasibility parameters.So, careful attention must be paid to implement the proper input data of solar radiation in future works.

•
This outcome of this study urge the authors to recommend average solar radiation from different data sources to be used as accurate input data for achieving the optimum techno-economic feasibility of PV power systems in future works.

Fig 1 :Fig. 2 .
Fig 1: Variation of monthly solar radiation obtained from different data sources

Figure 6
Figure6displays the effect of multiple data sources of solar radiation (SRC1, SRC2, SRC3 and SRC4) on No. of batteries versus wide range of daily load profile (10kWh-100kWh) for annual capacity shortage (0% and 5%).It can be seen clearly that different data sources of solar radiation lead to significant variation in No of batteries at both capacity shortages.

E3SFig 6 Fig. 7 (
Fig 1 (a-d): COE of PV power system versus daily load profile at four data sources of solar radiation and different annual capacity shortage

Table 1 :
Monthly solar radiation from different data sources for Baghdad

city Month Monthly Solar Radiation (kWh/m 2 ) SRC1: Climate site (Nasa) SRC2: Climate site (Weather base) SRC3: Meteorological department data (1984-2004) SRC4: Meteorological department data (1962-1992)
Techno Economic Assessment and Optimization Study of Hybrid Power System Using Homer Software for Electrification of Rural District in Ethiopia.International Journal of Renewable Energy Research.3(3).