1. Organization for Cross‐regional Coordination of Transmission Operators JAPAN:Interim report on the discussion on the master plan ‐ Possibility of augmentation focusing on the interconnection line.https://www.occto.or.jp/iinkai/masutapuran/2021/files/masuta_9_01_01.pdf
2. Agency for Natural Resources and Energy: “For introduction of large amount of renewable energy ‐"Grid constraint" problem and countermeasures”.https://www.enecho.meti.go.jp/about/special/tokushu/saiene/keitouseiyaku.html
3. Hokkaido Electric Power Co. Inc"Hokkaido's proposal to strengthen the transmission system".https://www.meti.go.jp/shingikai/enecho/shoene_shinene/shin_energy/keito_wg/pdf/023_01_00.pdf
4. A coordinated phase shifting control and remuneration method for a zonal congestion management scheme;Marinescu B;IEEE PES Power Systems Conference and Exposition,2004
5. Agency for Natural Resources and Energy: "Interim Report on the Next Generation of Electric Power Networks (Draft)"https://www.meti.go.jp/shingikai/enecho/denryoku_gas/saisei_kano/pdf/033_03_00.pdf