Dual-motor induction frequency-regulated electric drive with improwed electromagnetic and electromechanical compatibility

: pp. 24 - 36
Lviv Polytechnic National University
Lviv Polytechnic National University
Rzeszow University of Technology, Faculty of Electrical and Computer Engineering

Dual-motor induction frequency-regulated electric drive is used as an alternative to single-motor electric drive in case where there are difficulties in implementing an individual drive which are associated with the mechanical-transmission implementation. Dual-motor electric drive provides movement of traction mechanisms, working bodies of electric vehicles. Single- or dual-voltage source inverters with pulse-width modulation are used to power two induction motors. The disadvantage of such voltage source inverters is that the AC voltage is formed as a high-frequency sequence of different polarity pulses with steep front. It cases wave processes in the cable and consequently to overvoltage on the stator windings of the induction motor.

It is proposed to use 6-step voltage source inverter with switches control law of 180 degrees to solve the above problem. However, such drive has satisfactory indicators of electromagnetic and electromechanical compatibility, in particular, the presence of the 6th harmonic on the electromagnetic torque of the motor and the 6th harmonic in the input power of inverter. This limits the speed-control range of the induction motor.

It is proposed to shift of voltage-source-inverter output voltages on 30 degrees for improving the electromagnetic and electromechanical compatibility of dual-motor induction drive. It provides by shifting the conductance of second-inverter switches.

The mathematical model based on the method of average voltages in integration step has been developed to analyze the electromechanical processes of the dual-motor electric drive with two 6-step voltage inverters which voltages are shifted by 30 degrees.

Research results proofed that proposed solution enables to improve electromagnetic compatibility of electric drive with DC source and electromechanical compatibility of electric drive with load in comparison with the individual drive, in particular to eliminate the 6th harmonic of input power of inverters and the 6th harmonic of induction-motor electromagnetic torque, to reduce pulsation amplitude of electromagnetic torque more than 8 times and more than 2 times pulsation-amplitude of input current.

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