An estimate of CO2 emission reduction through large-scale integration of Photovoltaic and wind energies considering demand-supply balance in the electricity grid

2020 Fiscal Year Final Research Report

• Project/Area Number: 17K00703
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental policy and social systems
• Research Institution: Ritsumeikan University
• Principal Investigator: Takehama Asami 立命館大学, 産業社会学部, 教授 (60202157)
• Co-Investigator(Kenkyū-buntansha): 歌川 学 国立研究開発法人産業技術総合研究所, エネルギー・環境領域, 主任研究員 (40356572)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Keywords: 変動性再生可能エネルギー / 風力発電 / 太陽光発電 / 電力需給 / ユニットコミットメント / 地域間連系線 / 広域送電 / 炭素税

Outline of Final Research Achievements

This study analyses the feasibility of renewable electricity target at 45% in 2030 in the eastern Japan grids integrating large-scale wind and photovoltaic energies. The research evaluates effectiveness of interconnection transmission and carbon tax to achieve the renewable target. A simplified model of unit commitment with economic load dispatching simulates supply-demand balance in the eastern Japan grids. 44GW of wind and 43GW of PV systems are integrated in the eastern grids. The cross-regional interlink capacity of 1.8GW from Hokkaido to Tohoku and 10GW from Tohoku to Tokyo are developed. A capacity increase of interlink from Hokkaido and Tohoku to Tokyo is the major contribution to a substantial increase of renewable electricity share. A share of renewable electricity in the eastern Japan reached 55% in October and 57% in January compared to the zone demand.

Free Research Field

エネルギー政策論

Academic Significance and Societal Importance of the Research Achievements

2050年の二酸化炭素ゼロ排出に向けて，かつ，安全な電力システム構築に向けて，再生可能エネルギー電力で2030年に45％を達成する方法を検証した．東日本に風力発電を40GW程度導入すれば，需要比で，再生エネ電力比率で50％以上を達成できる見込みがある．このためには，地域間連系線の運用容量を拡大することが不可欠である．かつ，高い価格での炭素税により，石炭発電の供給を抑制することが必要である．