Inverter thermal redundancy control method and redundant inverter device

Abstract

The invention discloses a frequency converter thermal redundancy control method and a redundant frequency converter device. The redundant frequency converter device comprises a master frequency converter and M slave frequency converters, wherein the master frequency converter and the slave frequency converters are connected in parallel, and the master frequency converter is in communication connection with each slave frequency converter. The method comprises the following steps: during normal operation, the master frequency converter controls the master frequency converter and each slave frequency converter to normally operate according to a current sharing control algorithm; when any frequency converter in the device has a local fault, the frequency converter with the fault exits; and when a communication fault occurs between the master frequency converter and one slave frequency converter, the slave frequency converter exits. Each frequency converter in the device meets the capacityof independently carrying out full-load operation, when one frequency converter in the system has any fault, the frequency converter exits from the system, the other frequency converters continue to operate, the load is not affected, and full-load full-speed operation can be achieved.

Description

technical field [0001] The invention relates to the field of industrial electrics, in particular to a thermal redundancy control method of a frequency converter and a redundant frequency converter device. Background technique [0002] With the development of industrial technology, medium-voltage frequency converters have been more and more widely used. In recent years, the reliability requirements in the field of frequency converters have become higher and higher. The reliability of a single frequency converter has limited improvement. Although the frequency converter can be switched to power frequency operation when the frequency converter fails, it will cause great damage to the load and the power grid. Large impacts affect the life of equipment, and many precision loads do not allow faults to be directly switched to power frequency operation, which will cause system shutdown. [0003] At present, through searching, some inverter redundant operation schemes, such as redun...

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Problems solved by technology

[0006] The embodiments of the present invention provide a thermal redundancy control method for frequency converters and redundant frequency converter devices, which are used to solve the complex structure of redundant frequency converter devices in the prior art. When a certain frequency converter fails, the remaining frequency converters The operation of the server and the load operation are easily affected, and the technical problems of low operational reliability

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