DC voltage control for multi-terminal HVDC networks during permanent converter outage

Abstract

This paper presents a control strategy of offshore multi-terminal DC voltage control during a permanent power receiving converter outage. The proposed control strategy is used as a fault ride through (FRT) control tool for relieving DC voltage rise effects during power output converters outage. In addition it relies on local measurements and communication - free control rules in offshore wind farm (WF) converters and wind generators local controllers. Furthermore, the control strategy is designed for doubly fed induction generator (DFIG) based offshore wind farms. The functionality and feasibility of the proposed control strategy are presented in this paper through simulations of a three terminals offshore HVDC network system.