SYSTEM AND METHOD FOR DYNAMIC CONTROL OF ACTIVE POWER AT LOAD Russian patent published in 2014 - IPC H02P27/06 H02P25/02 

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering and can be used in AC drives. The system and method for AC motor drive control comprises a control system with programmed energy saving algorithm in which the operation of the electric motor drive is optimised. The control system provides the drive with an initial command "voltage-frequency" on the basis of the initial characteristic voltage/frequency (V/Hz), in real time it receives the drive's output data generated in accordance with the initial command "voltage-frequency" and sends back a variety of changed commands "voltage-frequency". Each command out of the variety of changed commands "voltage-frequency" contains a deviation from the initial characteristic "V/Hz". In real time the control system also defines the value of electric motor parameter corresponding to each command of the said variety of changed commands "voltage-frequency" and sends a changed command "voltage-frequency" back to the AC electric motor drive so that the indicated value of the electric motor parameter defined on a real time basis falls within the range of permissible values for the electric motor parameter.

EFFECT: minimisation of input power of an electric motor and provision for additional energy saving at keeping the stable operation of the electric motor.

11 cl, 10 dwg