Abstract
For efficient operation of the squirrel cage induction motor, the flux must be properly adjusted according to the torque. However, in such variable flux operation, the performance of torque control is limited by the flux control because it is not possible to measure and control the rotor current that affects the flux. On the contrary, in a double inverter-fed wound machine (DIFWM), the inverter is connected to the rotor side, as well as the stator side, and the rotor current can be controlled. This controllability of the rotor currents improves the operation performance of a DIFWM. This article presents the decoupling current control method of a DIFWM for fast flux and torque control. Since the rotor flux is directly calculated by the stator and rotor currents, the bandwidth of the flux control can be improved to the bandwidth of the current controller, which means that the torque control also has the same bandwidth. In this article, a detailed current controller design method with a DIFWM feed-forwarding decoupling method to eliminate all coupling interferences is proposed. The simulation and experimental results regarding the DIFWM are presented to verify the torque and flux control performance of the proposed control method.
Highlights
With the development of power semiconductors and digital signal processors, their cost has been reduced and their performance has improved
The components proportional to the synchronous frequency were compensated in the second control mode, the results of the d-axis currents were significantly different from the proposed method. This means that when the rotor flux is adjusted according to the torque command for the minimum copper loss (MCL) operation, the derivative term of the rotor flux component acts as a major coupling component
Simulation results for the current, rotor flux, and torque controls according to sinusoidal torque reference at the Figurraete7d. sSpimeeudla(1t0io5n5 rr/emsuinlt)s:r1t0heHczu;n5t0, Hrozt;o(rc)fl1u0x0, Hanzd. torque controls according to sinusoidal torque reference at the rated speed (1055 r/min): (a) 10 Hz; (b) 50 Hz; (c) 100 Hz
Summary
With the development of power semiconductors and digital signal processors, their cost has been reduced and their performance has improved. Unlike a structure in which two inverters are applied to the stator side, in a double inverter-fed wound motor (DIFWM), an additional inverter is connected to the rotor windings through slip rings and brushes Both side inverters provide power for driving the motor [10,11,12,13,14,15,16,17,18,19,20,21,22,23]. Electronics 2021, 10, 1845 Electronics 2021, 10, 1845 rotor side current are controlled, there is an additional degree of freedom in control compared to the conventional singly-fed motor drive system, such as IM. The conventional vector control of a DIFWM presented in [23] is reviewed for an easy explanation of the proposed control method
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