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

Abstract

IGBT inverter Medium-voltage motor chopper type double DSP digital speed control system, including uncontrollable rectifier, boost chopper and IGBT inverter, through two inner loop current controllers respectively control the boost chopper, IGBT The inverter is controlled, and the outer loop speed of the speed control system and the outer loop voltage of the inverter are controlled through two DSPs, and the program control of the speed control system and the motor system is implemented through a programmable controller. This system is suitable for ordinary wound asynchronous motors, internal feedback wound asynchronous motors, cage-wound brushless doubly-fed motors and cage-wound internal feedback brushless motors. It completely solves the problem of inverter subversion caused by grid faults and damage to equipment. High reliability, small control error, simple and convenient use, good man-machine interface, flexible communication means, remote monitoring and management, high degree of digitization, low cost, energy saving and environmental protection.

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.

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