Purpose. To substantiate the operability of a combined power source of asynchronous electric drive of a vehicle, consisting of two power sources and one autonomous voltage inverter, to establish operating modes using zero combinations of inverter keys and to formulate a condition for energy transfer to an electromechanical converter from an additional power source.Methodology. In the study on the work of an autonomous voltage inverter with two power sources, methods of mathematical and simulation modeling were used. To select the optimal method for implementing the control algorithm, a comparative analysis method and an analysis of a symmetric power system were applied.findings. The efficiency of the asynchronous motor power system from one autonomous voltage inverter with two power sources is proved. The paper presents mathematical calculations for constructing an electromechanical circuit, a modified algo rithm for switching the keys of an inverter of a combined power source is given; physical processes are described.originality. The conditions of energy transfer to the electromechanical converter from an additional power source are formu lated, which are provided by the choice of the load circuit parameters of the EMF of the additional source and increase the voltage component and the load capacity of the electromechanical converter.Practical value. The electromechanical circuit of the vehicle's asynchronous electric drive has been simplified due to the com bined power supply, consisting of two power supplies and one autonomous voltage inverter. One of the sources is an additional source that is connected to the electric motor through the connection circuit to the zero point of the stator motor windings and the "negative" terminal of the autonomous voltage inverter and includes a DCDC inverter, diode, inductor and discharge resistor.

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CoNTRol of eNeRgy flowS IN eleCTRIC DRIveTRAIN of eleCTRIC vehICle wITh eXTRA DC SoURCe Purpose. Development of design concept of control approach for the inverter for simultaneous control of the en ergy flows from two DC sources in electric vehicle drivetrain. methodology. Methods of mathematical modeling and simulation were used while researching modes of AC and DC components using one inverter. Also, a comparative analysis method was applied to select the optimal method for implementing the control algorithm. findings. Working efficiency of a twoway feed scheme for supplying asynchronous motor from two DC sources is shown. The work suggests the scheme design concept, provides a transistor control algorithm, and describes physical processes and engine characteristics. originality. Connection of DC source to a common (zero) point of the AC electric motor when the latter is fed from the threephase frequency converter, allows transmitting the energy to the motor without the dedicated con verter. Special valve switching algorithm for separate control of power flows is suggested. Practical value. The new scheme is a prerequisite for solving tasks of combining several electric power sources controlled by single combined converter, which simplifies the electric drivetrain in hybrid and electric vehicles.

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