Abstract
High-voltage direct current (DC) transmission systems and multi-terminal direct current transmission systems are attracting attention for expanding the grid to promote introduction of renewable energy. Fault clearing in DC systems is difficult because there is no zero point of current. Hybrid circuit breakers are suitable for fault clearing in DC systems. Conventional hybrid circuit breakers have a hard-switching path that damages the switch. Hard switching damages the device and produces emissions due to harmonic noise. A novel resonant hybrid DC circuit breaker is proposed in this paper. The proposed circuit breaker reduces the damage to the switching device using soft switching due to the current zero point. The proposed circuit breaker is compared with conventional hybrid circuit breakers using numerical simulations. Interruption times and switching types of circuit breakers were compared. The simulation results of the fault clearing characteristics of the proposed breakers show that the proposed breakers have sufficient performance and are capable of stable reconnections in multi-terminal direct current transmission systems.
Highlights
The introduction of renewable energy sources (RESs), such as wind generators and photovoltaic generators, has been advancing in recent years [1,2,3]
A novel resonant hybrid Direct current (DC) circuit breaker is proposed in this paper
The hard switching with conventional hybrid circuit breakers upon interruption has an adverse effect on the semiconductor switch
Summary
The introduction of renewable energy sources (RESs), such as wind generators and photovoltaic generators, has been advancing in recent years [1,2,3]. DC circuit breakers are the most reliable in fault interruption in DC systems [22]. Semiconductor circuit breakers have have a steady-state loss problem. In 2012, a hybrid circuit breaker with high speed and low steadya steady-state loss problem. The fault current flowing through the semiconductor semiconductor switches in the breaker path increases until the UFD opens. Breaker path rapidly turns off the high current and uses hard switching. The proposed circuit breaker creates a current zero point. A fault in an MTDC system was simulated to verify the practicality of the proposed switching. The proposed circuit breaker’s interruption time is sufficiently short and provides breaker. The proposed circuit breaker’s interruption time is sufficiently short and provides stable stable power transmission during faults.
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