Modelling, Operation and Control of Multiterminal DC Connection for Offshore Wind Farms

Abstract

Renewable energy systems are tending to become more and more present in the energy market and wind power has already proven its potential. Wind parks of thousands of MW are planned to be place into sea faraway from the mainland. Appropriate transmission systems should be designed in order to be able to handle a significant amount of power with high efficiency and to be economically competitive. This paper discusses a Multiterminal DC connection, based on VSC technology, between one offshore wind farm and two different grids. The main focus was on developing the control strategy for connecting these three systems via DC connection. The modelling and designing of the WF components, of the power converters, of the DC system components and of all the controllers played a major role in developing a simulation platform for future studies. The proposed concept may enable integration of large offshore wind farms at considerable distances. Experimental verifications follow the theoretical investigations in order to prove the reability of the modelled system for different test scenarios