HVDC Circuit Breakers Combining Mechanical Switches and a Multilevel PWM Converter: Verification by Downscaled Models

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Abstract
This paper presents two high-voltage direct-current (HVDC) circuit breakers that have the capability of interrupting a short-circuit current within several milliseconds. They consist of a current-limit inductor, a current-control inductor, one or two mechanical switches, and a multilevel converter with phase-shifted-carrier pulsewidth modulation (PWM). The two breakers can commutate an almost zero current from the main branch to the auxiliary branch. This paper proposes an original breaker with low-voltage and high-voltage mechanical switches connected in series, followed by a simplified breaker with a single high-voltage mechanical switch.Finally, this paper includes experimental verification by two slightly-different downscaled breakers rated at 300 Vdc and 150 Adc, as well as confirmation of an actual original breaker by circuit simulation using the "PSCAD/EMTDC" software package.
Funding Information
  • New Energy and Industrial Technology Development Organization

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