Application of Voltage Source Converter (VSC) such as High Voltage Direct Current (HVDC) has been widely recognized as one of the most advanced and powerful tools in providing a veritable way to control the transient instability in power system. However, the effect of this device on power system generator oscillation damping ratio during contingency need to be examined for effective system planning and monitoring. This research paper evaluates the effect of placing HVDC on the stability of power system generator oscillation damping ratio in order to improve the system stability during disturbance. Transient stability of electrical power system with contingency was performed using swing equations technique. Critical buses in the system at contingency was selected using Line-Voltage Stability Index (L-VSI) technique An HVDC VSC was incorporated in the power system and its effect on stability of the generator oscillation damping ratio at the contingency was investigated. Simulation was done in MATLAB R2023a. The approach was evaluated with data sets of IEEE 30-bus systems. Generator damping ratio, total active power losses and total cost of controllers were determined. The results revealed that placing HVDC in the power system improved the system generator oscillation damping ratio stability and has positive impact (stability) on electric power system.
Ayodele Kehinde Afolabi (2025) studied this question.