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Hybrid HVDC system for power transmission to island networks

Andersen, B. and Xu, L. (2004) Hybrid HVDC system for power transmission to island networks. IEEE Transactions on Power Delivery, 19 (4). pp. 1884-1890. ISSN 0885-8977

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A hybrid system, comprising a line commutated thyristor high-voltage direct current (HVdc) converter and a static VAR compensator, is proposed in this paper for the connection of networks with no synchronous generation to a main grid. The proposed system combines the robust performance and low capital cost and power loss of a line-commutated HVdc converter, with the fast dynamic performance of a voltage-source-converter (VSC)-based transmission system. The paper describes the principles and control strategies of the proposed system. PSCAD/EMTDC simulations are presented to demonstrate the robust performance and to validate the proposed system during various operating conditions such as black-start, variations of load or generation, and ac fault conditions.