Obara, Shin'ya: 'Key concepts [microgrids]' (Energy Engineering, 2017), 'Clean Energy Microgrids', Chap. 2, pp. 51-108, DOI: 10.1049/PBPO090E_ch2
IET Digital Library, https://digital-library.theiet.org/;jsessionid=39sl6s1av7fjt.x-iet-live-01content/books/10.1049/pbpo090e_ch2