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Optimisation of passive system components to minimise DC circuit breaker stresses in multi-terminal HVDC systems

Page, Frederick and Finney, Stephen and Holliday, Derrick and Xu, Lie and Williams, Barry (2015) Optimisation of passive system components to minimise DC circuit breaker stresses in multi-terminal HVDC systems. In: Cigré International Symposium : Across Borders - HVDC Systems and Market Integration, 2015-05-27 - 2015-05-28.

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Abstract

HVDC circuit breaker designs have commonly included additional series inductance to reduce the rate of rise of current during the initial transient period after a fault occurs, minimising the peak current stress that the circuit breaker must endure. A method of approximating the peak fault current and energy dissipation in a circuit breaker is developed, through circuit analysis of a multi-level converter (MMC) under fault conditions. These approximations are validated against simulation results for an 800kV MMC system