Under-voltage protection device and system of converter control system

Abstract

The invention provides an under-voltage protection device and a system of a converter control system; the device comprises a first energy accumulating unit, a second energy accumulating unit and an under-voltage protection unit; when the first energy accumulating unit is charged by an input power supply, and discharges and supplies power to a converter control unit; the second energy accumulating unit is charged by the input power supply, and discharges and supplies power to a switch tube driver; the under-voltage protection unit samples the voltage of the input power supply; and if the sampled voltage is less than first reference voltage, an under-voltage locking signal is sent to the converter control unit. We can know that when the first energy accumulating unit and the second energy accumulating unit discharge, the first energy accumulating unit supplies power to the converter control unit and the second energy accumulating unit supplies power to the switch tube driver, so that the converter control unit sends a correct blocking instruction and the switch tube driver correctly cuts off and protects an IGBT (insulated gate bipolar transistor) when the input power supply is under-voltage or loses power, and a converter safely exits a running state.

Description

technical field [0001] The invention relates to the field of control, in particular to an undervoltage protection device and system for a converter control system. Background technique [0002] Converters play a very important role in the fields of industrial frequency conversion, photovoltaic power generation, wind power generation, and power conversion. For example, as the traction power equipment of electric locomotives, traction converters are regarded as the "heart" of locomotives and EMUs, and are one of the important symbols to measure the technical level of a country's rail transit equipment. Whether the traction converter can operate safely and efficiently is the key to the safe and efficient operation of the train. [0003] The converter includes a converter module, a converter control unit, etc., wherein the converter module includes a switch tube driver and IGBT and other switch tubes, the switch tube driver is used to drive IGBT and other switch tubes, and the ...

AI Technical Summary

Problems solved by technology

However, if the input power supply is under-voltage or power-off at this time, the normal power supply of the converter control unit cannot be maintained, and the converter control unit is likely to issue incomplete or wrong instructions, causing the switch tube driver in the converter module to Actions such as closing the IGBT cannot be performed correctly, so the converter cannot exit the running state safely

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