Application of Control Lyapunov Functions to Voltage Source Converters-based High Voltage Direct Current for Improving Transient Stability

VSC-HVDC has become an important member in the field of power electronics with application in transmission systems thanks to its capability of fast response operation and independent control of active and reactive power. An appropriate control strategy and a correct selection of input signals allow the VSC-HVDC to enhance transient stability, damp power oscillations and provide voltage support in power systems in a significant way. This paper presents, as part of a development of a multichoice control for a VSC-HVDC, the derivation of a control strategy for transient stability, based on control Lyapunov function. The VSC-HVDC is represented by a general model, referred to as injection model which represents the VSC-HVDC as an element in the power system that provides adequate interaction with other system elements.