Chopping type bumpless switching bis-PLC intelligent speed-governing system of medium-pressure motor

Abstract

A dual PLC intelligent speed regulating system with chopping-type non-disturbance switching for medium-voltage motors includes an uncontrollable rectifier, a boost chopper, and an IGBT inverter. The boost chopper and the IGBT inverter are controlled via two inner-loop current controllers respectively, and two PLC control the outer-loop speed of the regulating system and the outer-loop voltage of the inverter respectively, as well as perform the program control to the speed regulating system and a motor system. The system suitable for ordinary winding asynchronous motors, internal feedback winding asynchronous motors, cage brushless doubly-fed motors and cage internal feedback brushless motors completely solves the problem of equipment damage caused by inversion stalling due to grid failures, and has incremental enhancement of various performance; the non-disturbance switching can be realized either from a full speed to a regulated speed or from the regulated speed to the full speed; and the motor even in the event of a regulating system failure can have continuous speed regulating operation. The system has the advantages of high system reliability, low control error, easy and convenient operation, good man-machine interface, and flexible method of communication. The remote supervision and management can be served, and the high degree of digitalization can be achieved with low cost, low energy consumption, and good environmental protection.

Description

technical field [0001] The invention relates to the technical field of AC motor speed regulation control, in particular to a medium-voltage motor chopping type non-disturbance switch double PLC intelligent 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, the in-depth development and application of medium and high-end PLC control systems, and the increasing improvement of fuzzy logic intelligent control strategies have laid a solid foundation for the digital and intelligent control of medium-voltage AC asynchronous mo...

AI Technical Summary

Problems solved by technology

[0011] 1 When the digital speed control system fails, the motor can still run with speed control instead of only switching to full speed operation;

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