Simulations on Interruption of Circuit Breaker in HVDC System with Two Parallel Transmission Lines

This paper describes the Electro Magnetic Transients Program (EMTP) simulation results for a study on specifications and duty of an HVDC circuit breaker in an HVDC system. The HVDC breaker employs an inverse current injection method and a capacitor precharged from the line voltage. The HVDC system is monopolar, but has two parallel transmission lines and is the simplest multiterminal system. The simulations demonstrated that the HVDC breaker can interrupt successfully under various breaking conditions.