id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ajst-32003	Wang, Jialiang	The Evolution of Flexible Alternative Current Transmission Systems Design from Thyristors to Modular Multilevel	2025	8	.pdf	application/pdf	3520	173	42	This article systematically reviews the technological evolution of power circuit topology in Flexible AC Transmission System (FACTS) devices, from thyristor semi controlled circuits to IGBT fully controlled architectures, and then to the distributed structure of modular multilevel converters (MMC), revealing the changes in circuit design concepts during technological iterations. As the core of FACTS devices, the topology of power circuits directly determines the performance boundary of the power grid, including applicable voltage levels, dynamic response speed, and operational reliability.	cache/ajst-32003.pdf	txt/ajst-32003.txt