*1.2. Motivation*

The complexity of the electrical power system relies in its ability to tackle the unexpected load variations. These load variations are managed by the electrical distribution system (EDS) for continuous electrical power supply to the loads. This system is categorized into radial and loop structured distribution systems. The use of radial DS (RDS) is preferred in this study as it is simple, cheap, and mostly applicable to sparsely distributed loads. Furthermore, to meet the rapid growth in demand as well as to promote sustainability, integration of renewable energy source (RES) in the distribution system is desideratum. The RESs, including Wind Turbine Generator (WTG) and Solar photovoltaic (SPV), provide minimal electrical losses, improves system bus voltages, possesses less operation costs, and more significantly, it emits less CO2 emissions. Thus, the optimization of these parameters would ultimately improves the reliability of the EDS. Reliability in an electrical power system is defined as the ability to provide adequate, stable, and reliable power for a particular distribution system. Therefore, the study on Reliability Assessment (RA) and performance analysis of RDS considering the optimal RES siting and sizing is crucial. It is also observed that the integration of renewable sources in EDS has considerable impacts on systems' operation and planning strategy [32]. Some issues co-related to RES integration are explained as follows.


The mentioned issues have been analyzed individually that is without considering the effect on another issue(s). The concept of analyzing the effect of the mentioned issues motivates the authors for carrying out this research work. In the view of strong motivation, this work is concentrated on the reliability assessment of IEEE 33 bus distribution system by considering the effect of electrical loss minimization through optimal siting and sizing of distributed generation system.
