Bidirectional direct-current solid-state circuit breaker based on SiC JFET

Abstract

The invention relates to the technical field of fault protection of medium and low voltage DC micro-grids and DC power distribution, in particular to a SiC JFET-based bidirectional DC solid-state circuit breaker topological structure, which comprises a voltage detection circuit, a piezoresistor (MOV), a buffer circuit, a SiC JFET, a gate drive circuit and a single chip microcomputer control circuit, according to the bidirectional direct-current solid-state circuit breaker, common source electrodes of two sets of SiC JFETs are connected to serve as main switch elements; the two sides of the switch element SiC JFET are connected with a voltage detection circuit, and the switch element SiC JFET is used for detecting short circuit faults of a source side circuit or a load side and carrying out bidirectional current cut-off in time. The two sets of SiC JFET switching elements are independently controlled, three working modes can be achieved by judging the occurrence condition of a short-circuit fault, then the driving circuit generates corresponding negative grid voltage to be turned off, and it is guaranteed that fault current is rapidly cut off.

Description

technical field [0001] The invention relates to the technical field of fault protection for medium and low voltage direct current microgrids and direct current power distribution, in particular to a topology structure of a bidirectional direct current solid-state circuit breaker based on SiC JFETs. Background technique [0002] With the rapid development of renewable energy power generation and distributed power generation, the importance of DC power distribution and DC microgrid is increasing, and the research on it is more in-depth and extensive. However, due to the inherent characteristics of DC current without zero crossing point and fast rising speed, the elimination and protection of DC fault current has become one of the key points of DC power grid protection, and the development of key equipment for DC protection is the key to fault current protection. Solid-state circuit breakers are different from traditional mechanical circuit breakers and hybrid circuit breakers....

AI Technical Summary

Problems solved by technology

Most of the above schemes are aimed at the research of DC circuit breakers for unidirectional fault w line protection, but in DC lines, the lines at both ends of the DC circuit breaker may have faults, and the current passing through the DC circuit breaker is bidirectional

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