Dynamic Model of a Dual Power Machine Controlled from the Rotor Side

Abstract

In the high power mode, the power of which exceeds 100 kW, as a rule, when energy is used in asynchronous motors it requires voltage up to 1000 V. This is due to a decrease in the weight and dimensions of the motor. But when developing a frequency-controlled electric drive, it is necessary to use a high-voltage frequency converter (FC), which leads to a significant increase in the cost of electrical wiring. A compromise solution can be found by using a dual power supply machine (MIS), a frequency control channel that needs to be transferred to the rotor circuit [1]. The use of TIR will significantly reduce capital costs and expand control functions over the drive. The article presents a mathematical description of a dual power machine. The main feature of this description is the choice of coordinate system. On the basis of it and taking into account its characteristics, a dynamic model of the machine has been built. The research group investigated the dynamic characteristics of the machine when applying a control signal from the rotor with a variable frequency. Control signals are presented in the form of ideal harmonic functions. In the further study, the constructed model will make it possible to investigate the launch of the machine in various modes. The dependence of the amplitude of the rotor voltage on its frequency is obtained. This dependence shows the possible range of variation of the voltage amplitude on the rotor while maintaining the synchronous MOS mode at a given speed. Simulation is made in electrical degrees. All angular velocities (rad / s) are expressed in frequencies (Hz). The behavior of the machine in a static mode was investigated when the load torque changes. A simulation model built in the Matlab environment is given.