Three-phase short-circuit failure restrictor based on IGBT (Insulated Gate Bipolar Translator)

Abstract

The invention relates to a three-phase short-circuit failure restrictor based on an IGBT (Insulated Gate Bipolar Translator), belonging to the technical field of electric power application. The three-phase short-circuit failure restrictor is composed of six IGBT modules, three electric reactors, three capacitors and three current sensors, wherein the three IGBT modules form an upper bridge arm, and the other three IGBT modules form a lower bridge arm; collector electrodes of the three IGBT modules of the upper bridge arm are respectively three incoming line terminals, and emitting electrodes of the three IGBT modules, the collector electrodes of the three IGBT modules of the lower bridge arm and one end of each of the three electric reactors are respectively corresponding connected together; the emitting electrodes of the three IGBT modules of the lower bridge arm are connected, the other ends of the three electric reactors are respectively connected with one end of each of the three capacitors so as to respectively pass through the three current sensors to form three outgoling line terminals; and the other ends of the three capacitors are connected together. A short circuit fault appeares in an electric system, the three-phase short-circuit failure restrictor can rapidly recognize and rapidly response, and can be applied in electric networks of different voltage grades.

Description

technical field [0001] The invention relates to a short circuit fault current limiting technology of a power system. It belongs to the technical field of power system application. Background technique [0002] With the continuous expansion of the capacity and scale of the power system, the short-circuit current of the power transmission and distribution system continues to increase, and the damage of the short-circuit fault to the power system and the electrical equipment connected to it is also increasing. The short-circuit current may exceed the breaking capacity of the circuit breaker. , the use of short-circuit fault current limiter is the best solution to improve the reliability of power system operation. Among many short-circuit fault current limiter schemes, the short-circuit fault current limiter based on power electronic switch technology used in flexible AC transmission technology is one of the mainstream development directions in the future, such as "Power System...

AI Technical Summary

Problems solved by technology

This kind of bridge-type short-circuit fault current limiter with bypass inductance, its half-controlled bridge switching devices are all selected silicon controlled rectifiers or integrated gate commutated thyristors (IGCT), and the volume of the DC current-limiting reactor that plays the main current-limiting role Big, costly, and heavy

When a short circuit occurs in the power grid, its own control method is complicated to cooperate with the inherent circuit breaker relay protection in the power system, the driving circuit is complicated, and the cost is high, so it is difficult to be widely used in the power system

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