Modeling, Experimental Validation, and Application of VARC HVDC Circuit Breakers
Siyuan Liu (Xi’an Jiaotong University, TU Delft - Intelligent Electrical Power Grids)
Marjan Popov (TU Delft - Intelligent Electrical Power Grids)
Seyed Sattar Mirhosseini (Iran University of Science and Technology, TU Delft - Intelligent Electrical Power Grids)
Simon Nee (SCiBreak AB)
Tomas Modeer (SCiBreak AB)
Lennart Ängquist (SCiBreak AB)
Nadew Belda (DNVGL - KEMA Laboratories )
Kees Koreman (TenneT TSO B.V.)
Mart A.M.M. van der Meijden (TenneT TSO B.V., TU Delft - Intelligent Electrical Power Grids)
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Abstract
This paper deals with the modeling, hardware results and model validation by measurements of a VSC assisted resonant current (VARC) dc circuit breaker (CB) and the application within a future network by simulation. The newly emerging VARC dc CB can be used as a solution for the protection of offshore multi-terminal HVDC (MTDC) grids. In this paper, the proposed VARC dc CB is modeled in detail in a PSCAD environment, by taking into account dielectric strength of the vacuum gap, high-frequency current quenching ability and parasitic components. The PSCAD-model is then verified by data from the testing of a 27 kV VARC dc CB prototype with maximum current interruption capability of 10 kA. Additionally, the initial transient interruption voltage and current slope at zero-crossing during the interruption are analyzed. With respect to scaling to a higher voltage level, three types of series connected modules are presented and the performances are compared. The performance of the series connected modules is simulated in a model of a 4-terminal HVDC grid. The obtained results validate the VARC dc CB as a promising solution for the dc fault isolation in MTDC grids.