CONTROL DEVICE FOR FREQUENCY CONVERTER Russian patent published in 2008 - IPC H02P27/06 H02M7/53846 

FIELD: electricity.

SUBSTANCE: invention is attributed to the field of electric engineering and can be used to control stand-alone voltage inverters in variable-frequency alternating-current electric drives. Module for calculating the optimal sliding and module for calculating the stator current vector are additionally introduced into frequency converter control device. Output of rotation frequency set unit is connected with the first input of module for calculating the optimal sliding and with the first input of mismatching device the second input of which is connected to measured electric drive rotation frequency sensor the output of which is connected to the second input of module for calculating the optimal sliding and to the second input of module for calculating the stator current vector the first input of which is connected with the output of module for calculating the optimal sliding, and the third input is connected with set unit for electric drive design parameters. Output of module for calculating the stator current vector is connected with the first input of current vector comparator and with the second input of voltage vector selection unit. Alternating current invertor sensor is connected with input of stator current vector converting unit the output of which is connected with the second input of current vector comparator and the third input of voltage vector selection unit the first input of which is connected with the output of current vector comparator and the third input is connected to rectified voltage sensor. Outputs of voltage vector selection unit are connected to invertor power transistors drivers.

EFFECT: providing minimisation of electric energy losses in electric drive at various load moments.

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