Investigation of the Influence of Embedded VSC-HVDC Transmission on Power System Stability

This paper quantifies the impact of an embedded VSCHVDC link on power system stability by computing the increase in maximum transfer capability of a long corridor subjected to a permanent fault in the middle of one of the interconnecting AC lines. The study is performed on a simple radial system as a number of positive-sequence RMS simulations using the DIgSILENT PowerFactory software and an implementation of a generic VSC-HVDC controller working in dq-reference frame. The maximum transfer capability, which is found by iteratively increasing the power exchange program between two synchronized areas until the operational limits of the network are violated, is used to tune the design and operational parameters of the HVDC link and provide comparison with alternative AC reinforcement of the…