ENERGY-EFFICIENT METHOD FOR CONTROL OF ASYNCHRONOUS TRACING ENGINES CONNECTED PARALLEL TO AN ONE INVERTER

摘要

An energy-efficient way to control asynchronous traction motors connected in parallel to one inverter, using direct torque control (Direct Torque Control, abbreviated DTC, in which the calculation of the current values of the electromagnetic moment and stator flux linkage is always carried out in the DTC block only by the first motor (engine of the first axle of the trolley during body control) in accordance with the expressions: where ψs and ψ of the first motor flux linkage along the α and β axes, respectively; us and stator voltage us and parallel are connected motors along the α and β axes, respectively; is and is is the stator currents of the first motor along the α and β axes, respectively; R is the phase resistance of the stator winding of the first motor, adjusted for changes in the temperature of the winding; M is the electromagnetic moment of the first motor; p is the number of pairs of poles; is the stator flux linkage vector module of the first motor; θ is the phase of the stator flux linkage vector of the first motor; and the calculation of the task at the moment supplied to the DTC block is carried out by the speed controller using the maximum or minimum signal rotational speeds (angular velocity) of asynchronous motors connected in parallel: in traction mode control is performed at maximum, and in braking mode - at minimum speed when using the proportional-integral speed controller, the torque reference M arriving at the DTC block is calculated by the formulas: - in traction mode - in braking mode it is limited to M, if it is exceeded, where k is the gain of the proportional link of the speed controller; T is the time constant of the integral link of the speed controller grow; ω- reference angular velocity at