Abstract
The DC bus connects multiple DC lines in a multiterminal flexible DC grid. When a short-circuit fault occurs on the DC line, the hybrid DC circuit breaker (HCB) configured on the DC line operates quickly to isolate the fault. However, the main breaker (MB) in the HCB requires a large number of insulated gate bipolar transistors (IGBT), resulting in a high economic cost. This article provides a multi-port HCB (MHCB) that shares a unidirectional MB to achieve DC bus and line fault isolation, considerably reducing the economic cost. By adding energy dissipation branches, the proposed MHCB lowers the amount of energy that needs to be dissipated by the metal oxide varistor (MOV) and effectively shortens the time required for fault isolation. The proposed MHCB's topology and operating principle are introduced in this article, and its efficiency is confirmed by comparison and simulation.
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