Analysis of a robust DC-bus voltage control system for a VSC transmission scheme

Abstract

This paper proposes a high dynamic digital control scheme for IGBT based VSC HVDC power transmission, i.e. VSC-HVDC system, based on equivalent continuous-time state-space models for the rectifier/inverter actuators, using a nonlinear approach. In this paper, both tracking and regulation problems are presented in order to perform a robust DC-bus voltage control. Results illustrate the good behaviour of the system variables in response to positive and negative active power steps.