Directional derivative‐based method for quasi‐stationary voltage support analysis of single‐infeed VSC‐HVDC units

Abstract

This study presents an investigation of the impact of the quasi‐stationary voltage support provided by a voltage source converter (VSC) connected to a single point of a power system. Based on the directional derivative concept, an analytical method is developed to quantify the sensitivities of the AC bus voltage with respect to the VSC reactive power control modes. Based on a real case study, it is shown that the method applies to VSC units that are part of VSC‐HVDC systems, which can operate in a point‐to‐point or multi‐terminal configuration. Time‐domain simulations are performed to verify the findings from the application of the analytical method on a reduced size power system.

Intelligent fault detection and location scheme for modular multi‐level converter multi‐terminal high‐voltage direct current

“…High-voltage direct current (HVDC)/Muti-terminal direct current (MTDC) is proposed as a promising technology for super-grid or collecting bulk renewable energy sources, that the amount of projects has been considerably increased since the last decade [1][2][3]. However, the insensitivity of high impedance, unsoundness of close to terminal fault detection and distraction of noise result in immaturity of the HVDC protection system.…”