Abstract

Hybrid renewable energy system (HRES) consists of more than one type of renewable energy technology such as wind and solar. The main application of such energy systems is to provide electricity to remote areas such as villages and islands, where no other means of power generation are available. Present study includes the basic information about the working methodology and other characteristics of HRES. Furthermore, two case studies of HRES have also been included to demonstrate the practical working of such energy systems. In first case study the performance of a small HRES, consisting of photovoltaic (PV) panels and wind turbines installed at Deokjeokdo island in South Korea, has been analyzed using real time measured experimental data. Second case study deals with the techno-economic optimization of HRES designed for fulfilling yearly electricity consumption of Deokjeokdo island. Out of multiple HRES solutions, two systems were declared as the optimal solutions based on lowest net present cost (NPC) and lowest levelized cost of energy (LCOE).

Keywords: renewable energy, hybrid energy system, economic feasibility, lowest net present cost

## 1. Introduction

In order to develop an eco-friendly island, it is necessary to make electricity, heat and water independence using renewable energy as an energy source. Present study is aimed at developing a sustainable eco-friendly energy and waterindependent community inside a small island called Deokjeokdo island—Incheon, South Korea. Considering the natural environment and geographical features with hills, a small communities called Urumsil town in Deokjeokdo island through ecofriendly energy sources based on a hybrid power system are developed. The hybrid power system consists of a small wind turbine, a photovoltaic panel, a pumped storage hydroelectricity and energy storage system. The renewable energy hybrid system can provide stable electricity and water to the island without greenhouse gas emission by fossil fuels. The Korea Institute of Civil Engineering and Building Technology (KICT) has signed a memorandum of understanding with Incheon city and is participating in the eco-island project centered on Deokjeokdo island. A local community in Deokjeokdo, Incheon city, was selected in 2013 to be developed as an environmentally-friendly energy and water independent community. A hybrid power system based on a small wind turbine, a photovoltaic panel, a pumped storage hydroelectricity and energy storage

system was built. Through this arrangement, electricity is supplied to the community without diesel power generation.
