Journal of Energy Engineering (에너지공학)

The Korean Society for Energy (한국에너지학회)
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A Study on the Integration Costs in Korean Electric System in Accordance with Increasing Solar and Wind Power Generation

태양광·풍력 발전 증가에 따른 한국의 전력시스템 내 통합비용에 관한 연구

  • Received : 2019.08.02
  • Accepted : 2019.09.16
  • Published : 2019.09.30
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Abstract

The solar and wind power is spreading as a means to $CO_2$ reduction, but it has the characteristics of the volatility depending on the weather changes. This article aims to estimate the additional integration costs in Korea electric system in response to such volatility of increasing solar and wind power generation, using Korea electric power trading analyzer(KEPTA). The analysis utilizes the statistics of "8th Basic Plan for Long-term Electricity Supply and Demand" and "Renewable Energy Plan 3020". As the results, integration costs will be estimated 13.94Won/kWh~32.55Won/kWh, consisting of 8.94Won/kWh as back-up costs, 1.03Won/kWh~4.45Won/kWh as balancing costs, and 3.97Won/kWh~19.16Won/kWh as grid-costs. These results suggest that when the integration costs are secured, Korea electric system will be expected in the stable situation. This article leaves the further studies with taking the technological development of solar and wind power generation, the introduction of energy storage system, and wholesale price of electricity into consideration.

태양광 풍력 발전은 한국의 에너지 전환에 있어서 핵심적인 요소이다. 특히 이산화탄소 감축과 미세먼지 저감을 위해서 태양광 풍력 발전 확대 보급은 정책적으로나, 사회적으로 필수 불가결한 선택이다. 이에 본 논문은 태양광 풍력 확대에 대응하여 한국 전력시스템 내에서 추가적으로 발생하는 비용, 즉 통합 비용에 대해 분석하고자 한다. 2019년~2030년에 걸친 "8차 전력수급기본계획", "재생에너지3020 이행계획"과 2016년 태양광 풍력 발전량을 기반으로 KEPTA를 활용하여 시나리오 분석한 결과, 2030년 13.94Won/kWh~32.55Won/kWh의 통합비용이 필요하며, 백업비용은 8.94Won/kWh, 균형비용은 1.03Won/kWh~4.45Won/kWh, 계통접속비용은 3.97Won/kWh~19.16Won/kWh가 필요한 것으로 나타났다. 이러한 추가 비용이 확보될 때 태양광 풍력 발전의 확대를 위한 전력시스템 내 안정성이 확보될 것으로 예상한다. 향후 태양광 풍력 발전의 기술 개발과 전력저장장치 도입, 그리고 도매시장 가격 변화 등을 고려한 연구가 필요하다.

Keywords

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