• Akash Jain
• Dr. K.T. CHATURVEDI
• Dr. SEEMA SAXENA

The advantage of parallel ac-dc power transmission for the improvement of transient and dynamic stability and damp out oscillations have been established. Present paper proposes a simultaneous ac-dc power flow scheme through the same transmission line to get the advantages of parallel ac-dc transmission to improve stability and damping oscillations as well as to control the voltage profile of the line by controlling the total reactive power flow. Only the basic idea is proposed along with the feasibility study using elementary laboratory model. The main object is to emphasize the possibility of simultaneous ac-dc transmission with its inherent advantage of power flow control. Control methods based on selective harmonic elimination pulse-width modulation (PWM) techniques with fuel cell system offer the lowest possible number of switching transitions and improve the voltage level in HVDC transmission system. This feature also results in the lowest possible level of converter switching losses. For this reason, they are very attractive techniques for the voltage-source- converter-(VSC) based high-voltage dc (HVDC) power transmission systems.

HVDC, VSC, Transmission system, PWM, Oscillations

"An Enhancement VSC based of HVDC Transmission system", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 6, page no.496-504, June-2018, Available :http://www.jetir.org/papers/JETIR1806314.pdf

"An Enhancement VSC based of HVDC Transmission system", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 6, page no. pp496-504, June-2018, Available at : http://www.jetir.org/papers/JETIR1806314.pdf