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The Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output.Abstract--This paper describes the use of Voltage Source Converter based HVDC transmission (VSC Transmission) system for grid integration of large wind farms over long distance. The wind farms can be based on either Doubly-Fed Induction Generator (DFIG) or Fixed Speed Induction Generator (FSIG). The paper describes the operation principles and control strategies of the proposed system. Automatic power balancing during network AC fault is achieved without communication between the two converters. PSCAD/EMTDC simulations are presented to demonstrate the robust performance and to validate the proposed system during various operating conditions such as variations of generation and AC fault conditions. The proposed VSC Transmission system has technical and economic advantages over a conventional AC connection for integrating large wind farms over long distance.

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