It was important to be able to determine if this injection could be done without problems on the Djiboutian network. In this report, the objective was to carry out an analytical study on the injection of the 30 MW Grand Bara solar power plant into the Djiboutian grid. This chapter also concludes the work for this thesis by reemphasising the need for localised solar radiation measurements and models.įinally, Chapter 7 collects the major conclusions given through the course of this text.
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The Chapter discusses the DDSR- 1B’s design, control, calibration and field tests in detail.Ĭhapter 6 in Part B considers 2 available software products that can generate estimates of direct normal solar irradiances for any ground location. The DDSR-1B is a prototype ground based instrument which is mounted on a remotely controlled solar tracker/sky positioner. The instrument is designed for measuring sky irradiance as well as direct solar irradiance. Chapter 5, presents the work done on the Direct-Diffuse Solar Radiometer (DDSR-1B). Diurnal 1-minute variations are discussed along with estimates of monthly and annual trends, with particular emphasis on atmospheric transmittance and the clearness index.
The acquired direct and global data for the sites are presented in Chapter 4. Therefore the methodology for and results from calibration of the site radiometers are given in Chapter 3. Regular radiometer calibration is necessary to ensure the data quality. Motivations for the development of the Direct-Diffuse Solar Radiometer are also included.Ĭhapter 2 describes the radiation mapping at the two sites, with particular emphasis on methods implemented for higher accuracy sampling, data reliability and continuity. Chapters 6 is given in Part B, “Data Modelling”.Ĭhapter 1 describes the concept of solar irradiance, discusses the components of solar radiation and introduces the radiometers in common use for the measurements of solar irradiance.
Chapters 1 to 5 are included in Part A under the heading “Measurement of Solar Irradiance”.
So, the presentation of the work is divided into two parts. The work done is twofold, the first on the measurements of solar irradiance and the second on the implementation of solar radiation models. Supplementary work has been done to re-affirm the need for quality ground-based data. In addition, a radiometer called the Direct-Diffuse Solar Radiometer has been developed for the mapping of sky radiance. This has entailed the development of an automatic data logging system, and frequent radiometer calibrations with traceability to the World Radiometric Reference. In light of the above, this work has aimed at improving the quality of radiation data at two specific locations one in Trondheim, Norway and the other in Durban, South Africa. These variations emphasise the need for localised solar radiation measurements and models. But, accurate assessment of solar energy at the Earth’s surface is difficult due to spatial, temporal and angular variability. It follows from scientific and engineering research within the field that accurate terrestrial solar radiation data and derived models can improve the detection of longterm climate change, the validation of Earth radiation budget estimates, and the deployment of solar energy systems. It is also the prime source for renewable energy technologies.Solar energy technologies can satisfy the current energy demand and at the same time reduce anthropogenic greenhouse gas emissions. Solar radiation is the main driving force for the Earth’s weather and climate.
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