Thermoeconomic installation limit of PV/WT hybrid energy systems for Off-grid islands |
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| Authors: | Jongdeuk Ahn Jong-Gyu Kim In-Yong Seo Jae Hoon Roh Seung Heon Song Jeonghun Song |
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| Institution: | 1. Green School, Korea University, Seoul, Korea;2. Korea Electric Power Corporation, Naju-si, Jollanam-do, Korea;3. Green Energy Institute, Samhyangcheon-ro, Mokpo-si, Jollanam-do, Korea;4. School of Mechanical &5. Aerospace Engineering, Seoul National University, Seoul, Korea |
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| Abstract: | An ideal off-grid island can become 100% energy-sufficient if one installs renewable energy systems such as solar photovoltaic (PV) and wind turbine (WT) systems. However, the intermittent and uncertain nature of the power supply from renewable energy systems hinders a 100% autonomy level (AL) without an infinite energy storage capacity. The thermoeconomic installation limit (TEIL) of a PV/WT hybrid energy system was studied using hourly weather data and the energy demand profile for off-grid islands. An appropriate battery size for the TEIL was also determined. Given the current installation cost of the hybrid energy system and the battery unit, the AL for a PV/WT hybrid energy system at the TEIL is calculated to be approximately 70%. Above the limit, the size of the energy storage unit and, correspondingly, the total annual cost of the PV/WT hybrid energy system increase sharply. |
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| Keywords: | Autonomy level battery size hybrid energy system off-grid islands thermoeconomic installation limit |
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