Current Status and Key Issues of HVDC Transmission Research: A Brief Review

With the construction of the Global Energy Internet, the current social resources, ecological environment, and climate conditions have been alleviated to a certain extent. The realization and improvement of HVDC transmission technology is an inevitable choice for the development of the Global Energy Internet. This article will review the status quo and existing technical problems of UHV DC transmission systems, and point out the difficulties and research directions of the current Voltage source converter (VSC) and Line commutated converter (LCC) technologies, which are expected to provide future development for hybrid DC transmission systems.