“…The voltage-balancing circuit is composed of the diode D , snubber capacitor C , thyristor Q , and resistors and . When the number of IGBTs changes, they can be disassembled or installed flexibly [27] , [28] , [29] , [30] . Fig.…”
“…The voltage-balancing circuit is composed of the diode D , snubber capacitor C , thyristor Q , and resistors and . When the number of IGBTs changes, they can be disassembled or installed flexibly [27] , [28] , [29] , [30] . Fig.…”
“…As FB-SMs in each phase of the ESS are divided into NUFBS modular units by the UFBSs (according to the physical characteristics and interruption performances [14], [31]), the UFBS rated blocking voltage VUFBS can be expressed as VUFBS = VEMNFB/NUFBS. Also, according to the mentioned principles, the IGBT pair and its paralleled MOVs within the auxiliary breaker are designed to withstand the on-state voltage drop sum of the NFB/NUFBS series-connected FB-SMs within one unit.…”
In an effort to minimize the power disruption between a dc grid and ac grids that host power converters during ac and dc network faults, this paper proposes a novel converter station structure to improve ac and dc fault ride-through performance of the multiterminal HVDC grid. The proposed structure consists of two independent ac and dc interfacing circuits, which are a half-bridge modular multilevel converter and a cascaded Hbridge (CHB) based energy storage system. Taking the advantages of high controllability and flexibility of the independent CHB converter and ease of integrating energy modules, a decoupled power relationship between the ac and dc sides is achieved, which is important for enhancing ac and dc fault performance. Operation of the proposed converter station under normal conditions and during ac and dc faults is explained, with the control system presented. Simulation validation of the proposed structure on a three-terminal HVDC grid confirms the enhanced performance, including the continuous operation during ac and dc faults with negligible power transfer disruption.
“…A number of solid-state and hybrid CB prototypes can be found in the literature [203][204][205][206][207][208][209][210][211][212][213][214][215]. Many of them were conceived for MVDC power systems [203][204][205][206][207][208][209][210][211], one for protection of superconducting magnets [212] and the others for HVDC power systems [213][214][215]. The solid-state CBs addressed in [207,213] and the hybrid CB presented in [215] are tested through reduced-scale prototypes.…”
Section: Circuit Breakersmentioning
confidence: 99%
“…The solid-state CBs addressed in [207,213] and the hybrid CB presented in [215] are tested through reduced-scale prototypes. On the other hand, the solid-state CBs for MVDC shipboard power systems addressed in [205,206,209] and the hybrid CBs described in [203,204,[210][211][212]214] are built up as full-scale prototypes. Finally, [208] proposes a CB employing a Z-source circuit to automatically switch-off a thyristor in response to a short circuit.…”
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