Adaptive control system of the compressor electric drive

The analysis of the existing principles of frequency conrol is carried out and the choice of the scalar principle for the compressor three-phase asynchronous electric motor control is justified. The regulated values of the rotation frequency pulsations of the compressor electric motor at various ranges of the speed regulation are defined and on the basis of it use of the closed double-circuit system of the coordinates slave regulation during the operation of the frequency converter in the current source mode as a system of the frequency control is offered. The effective sensorless metod of the rotation frequency and the resistance torque determination of the compressor electric motor on the basis of the Lyuenberger observers theory is offered. Dimension and coefficients of a Lyuenberger matrix proceeding from equality of the root geometric mean value of the control system characteristic polynomial and the angular frequency of the supply voltage are defined. Modeling of the received frequency control system of the compressor electric motor in the environment of visual programming Matlab/Simulink on the example of the threephase asynchronous engine 4AA63A4U3 is carried out. Having analysed data of modeling, it was revealed that this control system doesn't provide necessary rigidity of the mechanical characteristics in dynamics as rotation frequency pulsations of the compressor electric motor don't conform to the regulated requirements. For elimination of this disadvantage the correcting channel of influence on resistance torque on the motor for increase of the system robastness is synthesized. Rotation frequency pulsations of the compressor electric drive at various signals of the speed task are defined. It is proved that introduction the positive feedback through the corrective element to the control system reduces rotation frequency pulsations to the regulated values.