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Half-Bridge Modular Multilevel Converters (HB-MMCs) are defenseless against DC side faults. Different types of DC Circuit Breakers (DCCBs) assisted with arrester banks/damping resistors such as solid-state CBs and hybrid DCCBs can be used to interrupt the DC fault current. Arrester banks are used to block any overvoltage after interrupting the fault current and in turn to demagnetize the circuit inductors...
This paper presents the design, development and testing of a 30kW, 200V/900V modular multilevel converter (MMC) based DC/DC converter prototype. An internal LCL circuit is used to provide voltage stepping and fault tolerance property. The converter comprises two five level MMC based on insulated gate bipolar transistors (IGBTs) and metal oxide semiconductor field effect transistor (MOSFET). Due to...
The DC circuit breaker (DCCB) is an important component in future super DC grids to isolate a DC fault. Its requirements, during pole-to-ground and pole-to-pole fault conditions, are addressed in this paper, based on a three-terminal HVDC link. In the event of a pole-to-ground fault, DC cables and transformers are exposed to significant DC stresses. However, the converter arm currents and DC current...
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