Power conversion unit and mining frequency converter

Abstract

The invention provides a power conversion unit and a mining frequency converter. The power conversion unit is installed in a shell of the mining frequency converter. The power conversion unit comprises a water cooling plate; an inverter, a first DC bus system and a DC capacitor bank which are sequentially arranged on the first surface of the water cooling plate in a stacked mode; a second DC bus system which is arranged on the second surface of the water cooling plate; and a rectifier bridge which is electrically connected to the second DC bus system. The inverter is electrically connected with the DC capacitor bank through a first DC bus system; the first direct current bus system and the second direct current bus system are electrically connected. The power conversion unit further comprises a plug-in type connecting device, a plug part of the plug-in type connecting device is arranged on a first side surface of the water cooling plate, a socket part of the plug-in type connecting device is arranged on a rear plate of the shell, and slideways are respectively arranged on a second side surface and a third side surface of the water cooling plate. The power conversion unit can realize quick mounting and dismounting of a circuit system, improves the working efficiency, and can meet the requirements of equipment on-site maintenance.

Description

technical field [0001] The present disclosure relates to the field of frequency converters, and more specifically, to a power conversion unit and a mining frequency converter. Background technique [0002] At present, the water cooling plate of the mining frequency converter is usually fixed on the flameproof enclosure as a part of the rear cover of the flameproof enclosure. All components of the power conversion unit of the mining frequency converter are installed inside the water-cooled plate, that is, inside the flameproof enclosure, and the input and output ports of the power conversion unit and the peripheral circuits are connected by bolts. Due to the high voltage and large current at the external connection point of the power conversion unit, it is necessary to ensure a sufficient electrical safety distance and to consider the space limitation in the flameproof enclosure, resulting in complex structural design of the connection point and difficult insulation treatment...

AI Technical Summary

Problems solved by technology

Due to the high voltage and large current at the external connection point of the power conversion unit, it is necessary to ensure a sufficient electrical safety distance and also consider the space limitation in the flameproof enclosure, resulting in complex structural design of the connection point and difficult insulation treatment.

The narrow space makes it inconvenient for workers to install in the flameproof enclosure, resulting in low production efficiency and increased failure rates

At the same time, the bolted connection method used at the connection point also increases the difficulty of dismantling the faulty power conversion unit, and the faulty equipment often needs to be lifted up to be repaired, which prolongs the downtime of the equipment

However, for the loads that operate continuously underground, there are strict assessment requirements for the downtime of equipment, and the power conversion unit that is not easy to disassemble cannot meet the needs of on-site maintenance of equipment, which is sometimes not allowed for continuous production coal enterprises

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