P2G 기반 마이크로그리드의 경제성 분석 및 보급 방안에 관한 연구

Abstract

Recently, global interest in the hydrogen economy is increasing, and most advanced countries, as well as Korea, have established and implemented various policies to foster the hydrogen industry. Hydrogen is considered as an energy carrier that is able to integrate and control existing energy such as electricity, gas, and heat in one dimension, and theoretically, its possibility has already been confirmed. As the first step to implement this, advanced countries such as Switzerland and Germany are leading the development of Powr-to-Gas (P2G) technology. In Korea, some energy-related organizations are conducting various researches recently, and KEPCO (Korea Electric Power Corporation) began research to connect the P2G-based microgrid to the distribution grid in 2019. Currently, the design and construction of the demonstration site is in progress. In this paper, the economic feasibility of a P2G-based microgrid is analyzed and an appropriate direction of penetration is proposed considering the increase of hydrogen load. For the economic analysis, HOMER Pro, which is widely used worldwide for evaluating the economics of renewable energy and microgrids, is used and Bass' diffusion model is applied to predict the increase of hydrogen load. In the case study, the economic analysis is carried out to derive the optimal facility configuration for 10% of the total load of the Ulsan techno-industrial complex under construction of the P2G-based microgrid demonstration site. As well as the sensitivity according to the level of hydrogen load is evaluated for the purpose of utilization of unused energy caused by renewable energy.