Abstract
Overall performance of the voltage source converters (VSCs) has improved during the recent years. Improvement of the VSCs along with the attractive features of the VSC-based high-voltage direct current (HVdc) transmission systems over the thyristor-based HVdc transmission systems make it possible to build multiterminal VSC HVdc transmission systems. However, the VSCs are vulnerable against dc-side faults and a method needs to be employed to interrupt the dc fault current. In this paper, three different configurations of solid-state dc circuit breakers (CB) for protection purposes are studied. Moreover, a new control method to protect the VSCs against the dc-side fault is proposed. The new method makes it possible to interrupt the dc fault current with the existing ac breakers on the ac-side or with the lower rating solid-state (SS) direct current circuit breakers (DCCBs). The performance of the SS DCCBs and the proposed method are studied using real-time digital simulator.
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