1. Arefind HVDC control system;Ekstron;IEEE Trans. Power Appar. Syst.,1970
2. Improvement of power system transmission by solid-state techniques;Musgrave,1973
3. Increasing the pulse number of AC-DC converters by current reinjection techniques;Arrillaga;IEEE Trans. Power Appar. Syst.,1983
4. Developments in the phase-locked oscillator control system for HVDC and other large converters;Ainsworth,1985
5. Simple new PWM patterns for thyristor three-phase AC/DC converters;Biswas;IEE Proc.,1986