Middle voltage electromotor cutting wave dual DSP digital speed adjusting system for IGBT reverser

Abstract

A chopping double-DSP digital speed governing system of a medium voltage motor having an IGBT inverter comprises an uncontrollable rectifier, a boosting chopper and an IGBT inverter. The boosting chopper and the IGBT inverter are controlled through two internal ring current controllers. The speed of an external ring of the speed governing system and the voltage of an external ring of the inverter are controlled through two DSPs. The speed governing system and a motor system are controlled in a programmable way through a programmable controller. The system is applicable for ordinary wound asynchronous motors, internal feedback wound asynchronous motors, wound-cage brushless doubly-fed motors and wound-cage internal feedback brushless motors, and eliminates the problem of damaging equipments because of inversion resulting from grid failure out and out. The invention is highly reliable, is simple and convenient to be used, has excellent man-machine interface, can achieve remote monitoring and management, is highly digitalized, saves energy and is environmentally protective; the control error is small; the means of communication is flexible; and the cost is low.

Description

technical field [0001] The invention relates to the technical field of AC motor speed regulation control, in particular to an IGBT inverter medium-voltage motor chopper type double DSP digital speed regulation system. Background technique [0002] Medium and high voltage motors are widely used to drive fans and water pumps. If speed regulation can be used to adjust air volume and water pressure, a large amount of electric energy can be saved. Therefore, the market demand for medium and high voltage speed regulation systems with excellent performance and moderate cost is very high. exuberant. The popularization and application of digital control chips represented by DSP and single-chip microcomputer and the popularization and use of fuzzy logic intelligent control strategy have laid a foundation for the digital intelligent control of medium-voltage AC asynchronous motor speed regulation. [0003] In the AC motor speed control system, the existing high-power (>200KW) mediu...

AI Technical Summary

Problems solved by technology

[0010] However, during use, it was found that setting up overturn protection brought some new problems: when the thyristor inverter overturns and cuts off its DC main circuit, it will cause the rotor circuit to open instantaneously and generate high voltage, so an overvoltage protection circuit must be installed; The speed of action of the overvoltage protection circuit is very high, otherwise the boost chopper will be damaged first

As a result, the complexity of the system is increased, the reliability is reduced, and the wide application of chopper cascade speed regulation technology is affected.

Images