Optimal design and analysis of a grid- connected hybrid renewable energy system using homer pro: a case study of Tumbatu island, Zanzibar

Abstract

This study addresses the issue of quality electricity access on Tumbatu Island in Tanzania, with a specific focus on enhancing the high-voltage (HV) transmission line. While many studies concentrate on low-voltage (LV) transmission lines, HV lines play a crucial role and merit more attention. Therefore, the objective of the study is to improve the voltage profile of the HV transmission line through a hybrid energy system comprising solar PV, wind turbines, and batteries. This effort begins with an analysis of the total power demand and consumption, which are essential for designing an effective energy system. The study employs HOMER Pro to simulate various hybrid system configurations. The simulation findings indicate that integrating solar PV, wind turbines, and HV lines leads to a significant enhancement in the voltage profile, raising it from 29.6 kV to 31.23 kV during peak demand. This solution demonstrates the highest economic viability, boasting the lowest Net Present Cost (NPC) of USD 4 003 851 and a relatively short payback period (PB) of 3.79 years. Implementing this hybrid system not only meets the island's energy needs but also contributes to global pollution reduction and minimizes electricity costs for the population of Tumbatu Island. Furthermore, it addresses the demand for clean energy, emphasizing its role in achieving sustainable and accessible electricity in Sub-Saharan Africa and beyond