Electric transmission system and control method thereof

Abstract

The invention discloses an electric transmission system. The electric transmission system comprises a master control board and a power unit, wherein the unit power comprises a sub control board and a sub control driving board which is connected with the sub control board, the sub control board is connected with the master control board, and the master control board is used for controlling the sub control board. The invention also provides a corresponding control method, an electric transmission capacity expansion system and a control method of the electric transmission capacity expansion system. According to the electric transmission system and the control method, disclosed by the invention, the system structure in master control and unit sub control is adopted, the collection of a bus voltage signal, an input / output phase signal and the like is finished by the power unit, the unused placing of a functional circuit module is avoided, and the problems such as intricate circuit, difficult maintenance, inconvenient wiring and interference hidden danger brought by collecting an over-current detection signal and the like by an adapter board in the prior art are overcome; and in addition, the flexibility of the system configuration is enhanced, the parallel operation and the capacity expansion in larger power are easy, and the requirement on large-power transmission can be met.

Description

technical field [0001] The invention relates to the field of electric transmission, in particular to an electric transmission system and a control method thereof. Background technique [0002] As we all know, the frequency converter is an independent electrical transmission system with a single machine. In general, a single machine frequency converter can only meet the application requirements of a single drive with a small and medium power level, but for the application requirements of a single drive or multiple drives with a high power level, A stand-alone frequency converter is not enough, and it often requires a combination of multiple stand-alone frequency converters to work together. For example, in order to realize a high-power single-drive system application, multiple frequency converter power units of appropriate power levels need to be paralleled and expanded to meet the application requirements. [0003] In order to achieve parallel expansion, the control board o...

AI Technical Summary

Problems solved by technology

For example, in high-power transmission applications, the positions of the power units are usually relatively far away from each other, which causes great inconvenience to the wiring of various signal detections on the adapter board, and the intertwining of signal cables is complicated, which is not only difficult to maintain, but also easy to cause unknown interference

Furthermore, the application requirements of high-power transmission are always changing. For larger power expansion or more complex applications, due to the limitation of the adapter board hardware and the relatively simple control of the control board, it cannot be flexible, which is not conducive to the product's market presence. Large-scale promotion and application

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