Application of VSC-HVDC to enhance Transmission systems transient stability

Abstract

Voltage Source Converter (VSC) based High Voltage Direct Current (HVDC) technology, abbreviated as VSC-HVDC or HVDC Light, is an attractive transmission technology. With switch device having turn-on and turn-off capability, such as IGBT, VSC-HVDC has special characteristics comparing to conventional HVDC. Some of these characteristics are: the possibility of realizing independent controlling of active and reactive power; no requirement for fast communication between VSC stations. Based on the method of current injection at the ac bus of voltage source converter, the dynamic model for VSC-HVCD is described .
From the simulation results, the VSC-HVDC is proven to be able to improve the rotor angle and speed stability and dynamic performance of AC/DC interconnected transmission system.