Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Techno-Economic Analysis of Water Electrolysis System Connected with Photovoltaic Power Generation

태양광 발전 연계 수전해 시스템의 경제성 분석

  • HWANG, SUNCHEOL (Department of Chemical Engineering, Kyungil University) ;
  • PARK, JIN-NAM (Department of Chemical Engineering, Kyungil University)
  • Received : 2021.12.08
  • Accepted : 2021.12.20
  • Published : 2021.12.30
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Abstract

Hydrogen production, hydrogen production cost, and utilization rate were calculated assuming four cases of hydrogen production system in combination of photovoltaic power generation (PV), water electrolysis system (WE), battery energy storage system (BESS), and power grid. In the case of using the PV and WE in direct connection, the smaller the capacity of the WE, the higher the capacity factor rate and the lower the hydrogen production cost. When PV and WE are directly connected, hydrogen production occurs intermittently according to time zones and seasons. In addition to the connection of PV and WE, if BESS and power grid connection are added, the capacity factor of WE can be 100%, and stable hydrogen production is possible. If BESS is additionally installed, hydrogen production cost increases due to increase in Capital Expenditures, and Operating Expenditure also increases slightly due to charging and discharging loss. Even in a hydrogen production system that connects PV and WE, linking with power grid is advantageous in terms of stable hydrogen production and improvement of capacity factor.

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Acknowledgement

이 논문은 2021년도 정부(산업통상자원부)의 재원으로 한국에너지기술평가원의 지원을 받아 수행된 연구입니다(No. 20213030040170). 연간 태양광 발전량 자료를 제공해주신 한국남동발전에 감사드립니다.

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