Control method and master controller for cascaded high-voltage frequency converters

Abstract

The invention discloses a control method and a master controller for cascaded high-voltage frequency converters, and the method and the master controller are characterized in that a distributed design is adopted; the master controller comprises a main control panel plug-in and peripheral auxiliary plug-in for high-voltage frequency converters, and the plug-ins are designed in a distributed mode; the main control panel plug-in and the peripheral auxiliary plug-in are arranged outside a case; the main control panel plug-in for the high-voltage frequency converters is used for implementing control, data transfer and communication with a host computer; and the peripheral auxiliary plug-in is cooperatively used with a peripheral auxiliary changeover plug-in so as to complete the functions of the peripheral auxiliary plug-in such as the acquisition of various signals and the driving of power electronic devices, wherein the peripheral auxiliary changeover plug-in is used for completing the isolation and conversion of alternating current magnitudes, direct current magnitudes and switching values. By using the control method and master controller disclosed by the invention, appropriate frequency conversion adjustment modes can be set according to different load requirements, and the expansion of the different control modes can be realized conveniently; and because the function of a control system has an extendibility, the technological level as well as operation reliability and flexibility of the system are enhanced, the operation efficiency of equipment is improved, and the maintenance cost is reduced.

Description

technical field [0001] The invention belongs to the control technology of high-voltage frequency converters, and in particular relates to a control method and a main controller of cascaded high-voltage frequency converters. Background technique [0002] At present, the whole world is troubled by energy shortage, and the energy situation in my country is particularly severe. With the rapid development of China's economy, energy has become a bottleneck restricting economic growth, saving energy and reducing consumption has become a serious concern of the country and enterprises. At present, the country's macro policy advocates a conservation-oriented harmonious society, and the research and development of energy-saving products has received extensive attention. The high-voltage frequency converter with ideal energy-saving effect and speed regulation performance has attracted great attention from government departments and high-energy-consuming enterprises, and frequency conve...

AI Technical Summary

Problems solved by technology

[0007] The disadvantage of this technical solution is: the main controller device includes the busbar board installed in the case. When designing a large-capacity and complex frequency converter, when it is necessary to expand the circuit plug-in, the space in the case is insufficient, the structure of the frequency converter needs to be redesigned, and the compatibility is poor.

[0009] The technical solution proposed in the above-mentioned papers has the disadvantages that IGCT is used as a high-power switching device. Due to the large number of peripheral devices, the IGCT has many system failures, high cost, long maintenance cycle and high cost, and due to the complexity of the device, it is difficult for maintenance. High requirements for technical personnel make it difficult to maintain the frequency converter

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