%0 Conference Paper %B CIGRE International Symposium Electric Power System Future-Integrating Supergrids and Microgrid %D 2011 %T Small Signal Stability Improvement of AC Transmission Networks Using HVDC Grid %A S. P. Azad %A J. E. Tate %A R. Iravani %B CIGRE International Symposium Electric Power System Future-Integrating Supergrids and Microgrid %P 1-6 %8 September %G eng