Bidirectional hybrid hvdc cb with a single hv valve

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Abstract

This paper examines two new bidirectional hybrid dc circuit breaker (CB) topologies for application in meshed dc grids. The goal is to retain performance of hybrid dc CB with bidirectional current interruption while reducing semiconductor count, dc CB size, and weight. The fault current is routed to the unidirectional internal valve using multiple additional ultrafast disconnectors. Operation of both topologies is studied using a 320-kV, 16-kA simulation model, as well as demonstrated on a 900-V, 500-A lab prototype. The control systems are presented and discussed in detail. The low-voltage hardware prototypes verify performance of several new technical and operating solutions in laboratory conditions. A comparison is made with the existing dc CB topologies and performance and reliability compromises of each topology are assessed. The conclusion is that it might be possible to halve the dc CB semiconductor count while retaining same 2 ms opening speed and bidirectional operation.

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APA

Jovcic, D., Zaja, M., & Hedayati, M. H. (2020). Bidirectional hybrid hvdc cb with a single hv valve. IEEE Transactions on Power Delivery, 35(1), 269–277. https://doi.org/10.1109/TPWRD.2019.2912832

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