Frequency conversion all-in-one machine main loop topological structure with redundancy design

Abstract

A frequency conversion all-in-one machine main loop topological structure with the redundancy design comprises an input switching circuit, an alternating current inversion circuit, an output switchingcircuit and a fault switching circuit, the alternating current inversion circuit is composed of m common alternating current inversion units and n standby alternating current inversion units, and theinput switching circuit controls input and bypass of the alternating current inversion units. The output switching circuit controls the disconnection and connection of the output end of the AC inversion unit; and the fault switching circuit is used for controlling the output of the standby AC inverter unit to replace the output of the faulty common AC inverter unit. According to the topological structure of the main loop of the frequency conversion all-in-one machine, the standby unit and the corresponding switching control device are innovatively arranged, automatic bypass is achieved aftera certain inversion unit in a system breaks down, meanwhile, the standby unit is switched on, and it is guaranteed that the whole system can still work normally according to rated power; and the working reliability and redundancy characteristic of the whole machine are improved, and the problem that the whole machine is shut down due to faults of a single unit is avoided.

Description

technical field [0001] The present invention relates to a topological structure of a main circuit of an integrated frequency conversion machine, and more specifically, relates to a topological structure of a main circuit of an integrated frequency conversion machine with redundant design. Background technique [0002] In recent years, with the development of power electronics technology, the integrated design of frequency converter and load motor has been widely used in motor drive due to its small size, small footprint and convenient installation. In particular, multi-winding frequency conversion integrated motors have attracted more and more attention because the input side can directly use high-voltage input, and the output side can be driven by low-voltage multi-winding motors. However, there is a problem in the main circuit topology of the existing multi-winding frequency conversion integrated motor. If one of the multi-winding drive units fails, the entire drive system...

AI Technical Summary

Problems solved by technology

However, there is a problem in the main circuit topology of the existing multi-winding frequency conversion integrated motor. If one of the multi-winding drive units fails, the entire drive system will stop output. Reliability applications have a greater impact

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