High-reliability high-voltage frequency converter

Abstract

The invention discloses a high-reliability high-voltage frequency converter which comprises a three-phase multi-secondary-side winding transformer, N power units and a master control system, wherein the high-reliability high-voltage frequency converter is characterized in that the original side of the three-phase multi-secondary-side winding transformer is connected with the voltage output end of a three-phase power grid; each winding of the secondary side of the three-phase multi-secondary-side winding transformer is connected with a power unit; the same-phase power units are serially connected; the master control system comprises two or more than two control systems; a redundancy control mechanism is adopted between the control systems; information transmission between the control systems is realized through an industrial bus; and the control systems are connected with all power units through independent optical fibers. Through using the standby control system, the high-reliability high-voltage frequency converter has advantages of satisfying the generating requirement of industrial and mining enterprises, effectively improving reliability of the high-voltage frequency converter, and reducing risk of unplanned shutdown of the frequency converter.

Description

technical field [0001] The invention relates to the technical field of high-voltage frequency converters, in particular to a high-voltage high-voltage frequency converter with high reliability. Background technique [0002] With the development of power electronics technology, frequency converter, as an important part of intelligent electronic control system, plays an increasingly important role in various fields of national economy, such as electric power, water conservancy, petrochemical, metallurgy and other industries. [0003] The rapid development of my country's industrialization has promoted the development of motor manufacturing and application in the direction of high voltage and high power. High-voltage motors are often the key components in the corresponding industries, and as the only power supply for high-voltage motors, the reliability of frequency converters has become a key factor restricting production. [0004] As the core part of the high-voltage frequen...

AI Technical Summary

Problems solved by technology

The conventionally designed main control system is composed of power circuit, sampling circuit, control circuit and other parts. Failure of the power circuit, abnormal sampling circuit or failure of the control circuit will cause the inverter to stop, causing major accidents in the production system, and affecting the normal production of enterprises under working conditions. In severe cases, it will also affect the stable operation of the corresponding power network, oil and gas pipelines and other infrastructure related to the national economy and people's livelihood

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