Hybrid high-voltage direct current circuit breaker based on constant-pass type SIC device and control method thereof

Abstract

The invention discloses a hybrid high-voltage direct current circuit breaker based on a constant-pass type SIC device and a control method thereof and belongs to the electrical equipment and electricengineering technology field. The circuit breaker comprises a through-flow branch, a transfer branch, an energy absorption branch, and a control system. The through-flow branch includes a fast mechanical switch and an auxiliary SIC fully-controlled power switch tube. The transfer branch includes a constant-pass type SIC power device high-voltage switch. The energy absorption branch includes a metal oxide variable resistor (MOV). The control system includes a direct current detection module, a driving circuit module, and a control circuit module. In the invention, problems of a large direct current transmission system cut-off line fault technology difficulty, multi-cascade power device driving and series voltage sharing can be solved, the structure is simple, cost is low and reliability ishigh.

Description

technical field [0001] The invention relates to the technical field of electrical equipment and electrical engineering, in particular to a hybrid high-voltage direct current circuit breaker based on a normally-on SIC device and a control method thereof. Background technique [0002] High-voltage DC circuit breakers are key equipment for cutting off line faults and are crucial to maintaining the safe operation of DC power grids. Due to the low line impedance of the DC transmission system, when a short-circuit fault occurs on the line, the fault current rises quickly and has a high amplitude. The DC circuit breaker is required to respond quickly and have a large breaking current amplitude. In addition, compared with the AC transmission system, the DC transmission system is unipolar, and the current has no zero-crossing point, so the breaking principle of the AC circuit breaker cannot be applied. It is necessary to manually create the zero-crossing point to realize the current ...

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide a DC power transmission system based on normally-connected devices with simple structure, low cost and high reliability, which can solve the technical difficulty of cutting off line faults, multi-cascade power device drive and series voltage equalization. Hybrid high-voltage DC circuit breaker of type SIC device and its control method

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