A bidirectional DC solid-state circuit breaker based on cathode short-circuit gate-controlled thyristor

Abstract

The invention belongs to the technical field of electronics, and particularly relates to a bidirectional direct-current solid-state circuit breaker based on a cathode short-circuit grid-control thyristor. The bidirectional direct-current solid-state circuit breaker mainly comprises a first direct-current power supply V1, a second direct-current power supply V2, a first CS-MCT (T1), a second CS-MCT(T2), a main loop composed of a first diode (D1) and a second diode (D2), a third CS-MCT (T3) and a fourth CS-MCT (T4), wherein the current conversion loop is composed of a first resistor (R1), a second resistor (R2), a current conversion capacitor (C), an inductor (L) and a third resistor (R); and the monitoring unit is composed of a Hall current sensor and a voltage comparator. The bidirectional direct-current solid-state circuit breaker is characterized in that CS-MCT with low on-resistance and high di / dt capability is used as a semiconductor switch, and rapid interruption of fault currentcan be realized by combining a monitoring unit and a gate control unit. Compared with a traditional solid-state circuit breaker, the CS-MCT-based solid-state short-circuit breaker not only has the capability of interrupting bidirectional current, but also has the advantages of low power consumption and high response speed.

Description

technical field [0001] The invention belongs to the technical field of semiconductors, and in particular relates to a bidirectional DC solid-state circuit breaker based on a cathode short-circuit gate-controlled thyristor (Cathode-Short MOS-Controlled Thyristor, CS-MCT for short). Background technique [0002] Facing the rapid economic and social development, the society's demand for various types of energy is constantly increasing. As the "blood" of today's information age, electric energy provides power to promote economic and technological progress. At the same time, users have put forward many new requirements for the power system: environmental friendliness, improvement of safety and reliability, higher quality and economy, and support for two-way interaction between users and the power grid, etc. At present, renewable clean energy based on photovoltaics, wind, and electricity has attracted much attention because of its small environmental cost. In order to more fully...

AI Technical Summary

Problems solved by technology

However, since the thyristor is a flow-controlled device, the design of its drive and protection is more complicated.

Wide bandgap semiconductor devices based on SiC and GaN have low conduction power consumption, but their applications are limited by device reliability and cost

On the other hand, most current circuit breakers are unidirectional structures, which can no longer meet the needs of the growing DC transmission (distribution) network (application number: 201510858644.9)

However, some bidirectional circuit breakers have the characteristics of complex circuit structure and difficult drive control (application number: 201610630952.0)

All these restrict the development of DC transmission (distribution) network

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