1. Direct Current Transmission—Volume I;Kimbark,1971
2. High Voltage Direct Current Transmission;Arrillaga,1998
3. HVDC Power Transmission Systems—Technology and System Interactions;Padiyar,1990
4. HVDC Projects Listing;Melvold,1965
5. The phase-locked oscillator—a new control system for controlled static converters;Ainsworth;IEEE Trans. Power Appar. Syst.,1968