Abstract
This paper proposes a new and surge-less solid-state direct current (DC) circuit breaker in a high-voltage direct current (HVDC) transmission system to clear the short-circuit fault. The main purpose is the fast interruption and surge-voltage and over-current suppression capability analysis of the breaker during the fault. The breaker is equipped with series insulated-gate bipolar transistor (IGBT) switches to mitigate the stress of high voltage on the switches. Instead of conventional metal oxide varistor (MOV), the resistance–capacitance freewheeling diodes branch is used to bypass the high fault current and repress the over-voltage across the circuit breaker. The topology and different operation modes of the proposed breaker are discussed. In addition, to verify the effectiveness of the proposed circuit breaker, it is compared with two other types of surge-less solid-state DC circuit breakers in terms of surge-voltage and over-current suppression. For this purpose, MATLAB Simulink simulation software is used. The system is designed for the transmission of 20 MW power over a 120 km distance where the voltage of the transmission line is 220 kV. The results show that the fault current is interrupted in a very short time and the surge-voltage and over-current across the proposed breaker are considerably reduced compared to other topologies.
Highlights
Renewable energy such as solar and wind power as environmentally friendly and sustainable energy resources have attracted extensive attention in recent years
Due to the development of semiconductor devices, voltage source converters (VSCs) or self-commutated converters have substantial advantages compared to the current source converters (CSCs) or line commutated converters (LCCs)
This paper proposes a new and surge-less solid-state circuit breaker (SSCB) in an modular multilevel converter (MMC)-high-voltage direct current (HVDC) transmission system
Summary
Renewable energy such as solar and wind power as environmentally friendly and sustainable energy resources have attracted extensive attention in recent years. The HVDC transmission system is a key technology for integrating various AC grids and economic transmission of large-capacity renewable energy for a long distance especially for remote areas [1]. This huge amount of power transmission needs stable and reliable converters with high power capability. In 2010, the new type of VSC called modular multilevel converter (MMC) was developed by Siemens, which eliminates the aforementioned problems and has several technical and economic advantages as described in [6,7,8]
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