Control method for acceleration and deceleration smooth operation of frequency converter

Abstract

The invention relates to the technical field of frequency converter starting, in particular to a control method for acceleration and deceleration smooth operation of a frequency converter, which ensures smooth acceleration and deceleration while maintaining speed response and positioning accuracy of the frequency converter, and has no time error between cycles. The difference value of the current command signal and the current feedback signal is sent into the current differential controller to obtain a voltage compensation signal, the difference value of the voltage compensation signal and the voltage command signal is sent into a new voltage command signal, and the new voltage command signal and the current command signal are sent into the acceleration and deceleration variable quantity processing module to obtain a speed command. The acceleration and deceleration variable quantity processing module comprises the following processing steps that after a new voltage command signal and a current command signal are sent in, whether the speed change is too large to cause vibration or not is judged, if vibration exists, the speed variable quantity is reduced and recorded, and the speed of this time is output; if vibration is not generated, whether a record of reducing speed change exists is checked, if not, the speed is output, and if yes, the speed is output according to the record of increasing the speed change quantity.

Description

technical field [0001] The invention relates to the technical field of frequency converter startup, in particular to a control method for smooth acceleration and deceleration of frequency converters. Background technique [0002] With the use of frequency converters, many applications require cycles of acceleration, constant speed, and deceleration. The process requires that the speed of the inverter should be fast, the cycle time should be accurate, and the time error of each cycle must also be small. Involved here is the speed response, positioning accuracy, and time error of the frequency converter control technology. [0003] See figure 1 As shown, the control timing of two cycles is taken as an example, where T1 is the acceleration time, T2 is the constant speed time, T3 is the deceleration time, TS1 is the first cycle time, and TS2 is the second cycle time. [0004] Ideal result: The shorter the T1 acceleration time and T3 deceleration time setting, the better; the ...

AI Technical Summary

Problems solved by technology

[0019] In order to solve the problem that the acceleration and deceleration control of the existing frequency converter is difficult to meet the requirements, the present invention provides a control method for smooth acceleration and deceleration of the frequency converter, which ensures smooth acceleration and deceleration while maintaining the speed response and positioning accuracy of the frequency converter , there is no time error between cycles

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