5Davidson C C, Horwill C, Granger M, et al. A power-electron- ics-based transmission line de-icing systemiC]//8th IEE Inter- national Conference on AC and DC Power Transmission(ACDC 2006). London, UK: IEE, 2006: 135-139.
6Horwill C, Granger M, Defy A. An application of HVDC to the de-icing of transmission lnes[C//2005/2006 IEEE PES Trans- mission and Distribution Conference and Exhibition. Montreal, Canada: IEEE, 2006: 529-534.