Voronov R. Electromechanical systems traction powered by two motors from one inverter

Variants of further development of the structures of traction electromechanical systems by supplying several traction motors from one inverter are considered, which makes it possible to simplify the structure of the system by reducing the number of used semiconductor components. The system of averaged vector structure control of two asynchronous motors, which are powered by one inverter, with the possibility of separate torque control of each motor, which differs from the existing ones by the formation of the averaged and differential values of the motor torques, which are further used to calculate the signals for setting the contours of the system current components, has been developed. A system for direct torque control of two permanent magnet synchronous motors, which are powered by one inverter, has been developed, which differs from the existing ones by the possibility of using additional voltage vectors in cases of deviations of the state variables of the motors among themselves. An inverter control system with four arms for powering a two-motor traction electric drive has been developed, based on voltage modulation of two motor phases, which differs from the existing ones by the presence of subsystems for compensating voltage fluctuations on the circuit capacitors. Scientific novelty of the obtained results: - for the first time the structure of the system of diligent vector control of two induction motors powered by one inverter, with the possibility of separate control of the torque of each motor, which differs from the existing formation of average and difference values of motor moments, which are then used to calculate; - for the first time a system of direct torque control of two synchronous motors with permanent magnets powered by one inverter was developed, which differs from the existing ones by the possibility of using additional voltage vectors in cases of deviations of motor state variables; - the theory of semiconductor converters for power supply of two-motor traction electromechanical systems was further developed by developing a control system based on voltage modulation of two motor phases and differing from existing ones by the presence of voltage oscillation compensation subsystems on circuit capacitors. The practical significance of the dissertation. The results of the dissertation can be useful: - in the development of algorithms for control systems of electric vehicles containing several traction motors powered by a single source of electrical energy; - in the development of schemes of power units and control systems of traction electric drives of rolling stock of subways and railways; - when designing anti-skid systems for electric vehicles; - in the educational process during the teaching of special disciplines dedicated to electric transport.