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Modular input-parallel-output-series DC/DC converter control with fault detection and redundancy

Lian, Yiqing and Holliday, D. and Finney, S. (2015) Modular input-parallel-output-series DC/DC converter control with fault detection and redundancy. In: 11th IET International Conference on AC and DC Power Transmission. IEEE, Piscataway, NJ., pp. 1-8. ISBN 9781849199827

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Large offshore wind farms will require an extensive sub-sea power network to provide internal interconnection. Present solutions are based around conventional medium-voltage AC architectures. This paper proposes an alternative DC collection network based around modular DC/DC converters with input-parallel-output-series (IPOS) connection. Small-signal analysis of the converter is presented, to assist in control scheme development for the converter input and output stages. A Lyapunov controller is embedded within the conventional output voltage sharing control loop. A master-slave control scheme is proposed to ensure power sharing under a range of operating conditions, and provides fault-tolerant operation since the status of 'master' can be reallocated in the event that the present 'master' module fails.