Controller Design and Stability Analysis of VSC based HVDC Transmission System

The chief advantage of VSC based HVDC links over conventional HVDC is the controllability it offers on both the rectifier and inverter ends. The DC voltage, AC voltage, frequency, active and reactive power can be controlled on either side, which has been studied. Thereafter, stability analysis for the two- terminal VSC based HVDC transmission system is performed. For the integration of VSC based HVDC links into the networks consisting of large wind farms and other industrial systems, the VSC based link has been checked for transient stability, voltage stability and frequency stability. All simulations are performed using MATLAB. Further, small signal stability of the link is studied to ensure that it is stable under small disturbances. For this analysis, both cases of lossless converter and converter with losses are considered.