HVDC application for enhancing power system stability

In this paper, the benefit of power system stability that occurs when applying the voltage source converter based high voltage direct current (VSC HVDC) is discussed. Due to the advantages of fast and decoupled active and reactive power control, VSC HVDC can be used to dampen the oscillation of the load angle of the generator after disturbance. This feature of VSC HVDC should be useful for the Vietnamese power system, which has many problems in operation, maintenance and protection due to the fast rate of its development. Firstly, a review of VSC HVDC technology is introduced. Secondly, the problems which Vietnam has to face will be discussed. And lastly, the improvement of power system stability by applying the VSC HVDC is illustrated with a simulated model in Matlab/Simulink. The results reveal that the use of VSC HVDC greatly improves the stability of the power system as compared to HVAC.