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New breed of network fault-tolerant voltage-source-converter HVDC transmission system

Adam, Grain Philip and Ahmed, Khaled and Finney, Stephen and Bell, Keith and Williams, Barry (2013) New breed of network fault-tolerant voltage-source-converter HVDC transmission system. IEEE Transactions on Power Systems, 28 (1). 335 - 346. ISSN 0885-8950

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Abstract

This paper proposes a new breed of high-voltage dc (HVDC) transmission systems based on a hybrid multilevel voltage source converter (VSC) with ac-side cascaded H-bridge cells. The proposed HVDC system offers the operational flexibility of VSC-based systems in terms of active and reactive power control, black-start capability, in addition to improved ac fault ride-through capability and the unique feature of current-limiting capability during dc side faults. Additionally, it offers features such as smaller footprint and a larger active and reactive power capability curve than existing VSC-based HVDC systems, including those using modular multilevel converters. To illustrate the feasibility of the proposed HVDC system, this paper assesses its dynamic performance during steady-state and network alterations, including its response to ac and dc side faults.