Topological structure of double-arm architecture quick hybrid direct current breaker

Abstract

The invention discloses a topological structure of a double-arm architecture quick hybrid direct current breaker. The topological structure of a double-arm architecture quick hybrid direct current breaker is characterized in that in a first bridge arm, a main breaker A1 branch circuit is formed by a solid state switch group of unidirectional serial anti-parallel diodes; a main current branch circuit is formed by serial connection of a quick mechanical switch A3 and a bidirectional load conversion solid state A2 switch; an energy freewheeling absorption loop is formed by serial connection of a non-linear discharge resistor A5 and a freewheeling diode group A4, and is in parallel connection with a serial branch circuit which is formed by a diode A6 and a quick mechanical switch A7 at two ends of A4; in a second bridge arm, a main breaker B1 branch circuit is formed by a solid state switch group of unidirectional serial anti-parallel diodes; and a main current branch circuit is formed by serial connection of a quick mechanical switch B3 and a bidirectional load conversion solid state B2 switch. The topological structure of a double-arm architecture quick hybrid direct current breaker can close, bear and cut off the current in the normal loop condition, can close, bear and cut off the current in the abnormal loop condition in a specified time, and can improve the practical engineering applicability.

Description

Technical field [0001] The invention relates to the field of circuits, in particular to a topological structure of a fast hybrid DC circuit breaker with a dual-arm architecture. Background technique [0002] With the gradual development of high-voltage voltage source converters and multi-terminal flexible DC transmission (distribution) technology, fast DC circuit breakers are one of the key equipment for the engineering application of DC transmission (distribution) grids, which need to be carried and opened within a specified time. Interrupting the normal current of the DC grid and various fault currents is the basis for the operation, control and protection of the DC transmission (distribution) network construction. [0003] High-voltage DC circuit breakers face major challenges: DC current does not have a natural zero-crossing point, and DC arcs are not easily extinguished; after the DC current is interrupted, a large overvoltage will be generated, and a large amount of energy st...

AI Technical Summary

Problems solved by technology

However, the main problem is that the source and grid are always in the grounding loop during the discharge of the arrester, which increases the rated voltage and energy consumption capacity of the arrester, thereby affecting the cut-off speed of the circuit breaker. As the grid voltage level increases, the cost will also increase significantly

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