机车电传动 (Sep 2023)
Application and development of power electronic devices in VSC-HVDC transmission system
Abstract
Voltage sourced converter based high voltage direct current (VSC-HVDC) is the core technology of new type of power systems with new energy as its main part. VSC-HVDC has outstanding advantages such as independent control of active and reactive power, fast and flexible response, strong scalability, and no commutation failure. It is widely used in new energy transmission, grid interconnection, island power supply, and long-distance and high-capacity power transmission. Power electronic devices play an important role in AC/DC conversion in VSC-HVDC systems. At present, 3.3 kV and 4.5 kV power devices (IGBTs) are generally used in VSC-HVDC projects at home and abroad. To meet the needs of long-distance and high-capacity DC transmission of large new energy projects, and the needs of large-scale development and utilization of offshore wind farms, power devices are developing towards higher voltage and larger current to help achieve the carbon peaking and carbon neutrality goals. In this paper, the development status and trend of power electronic devices in VSC-HVDC technology were reviewed, the application status of power electronic devices in VSC-HVDC projects was systematically described with several representative domestic projects as examples, and the main technical characteristics of power electronic devices for VSC-HVDC were emphasized. Finally, the prospective application directions and development trends of high-voltage and high-power devices were explored.
