Optimization of static modes traction asynchronous electric drive with frequency-current control

To increase the energy performance an asynchronous electric drive operating mode with frequency-current control is proposed operating at a critical slip on the fan load. The structure of asynchronous electric drive of constant power with frequency-current control is proposed operating at critical slip. Theoretically the operating point of the electric drive in which the slip is equal to or equal to the critical one will be a point of unstable equilibrium. In an open-loop control system of the coordinates of an electric drive, it is impossible to ensure its stable operation on a critical slip due to uncontrolled disturbances. Therefore, it was proposed to use a closed-loop control system with subordinate regulation of the main coordinates. The stator current and rotation frequency were chosen as such coordinates. The peculiarity of this structure is the control algorithm of the frequency converter, which consists in the fact that the voltage is calculated by the subordinate coordinate control system from the condition of maintaining constant power. A model of such an electric drive was developed in Simulink and its operation was simulated. The proposed solution of an asynchronous electric drive with frequency-current control ensures stable operation at critical slip and at the same time minimizes the stator current consumption. Since the parameters of an asynchronous electric motor are not constant and can change during operation, then to calculate the required speed addition, it is advisable to use extreme regulation of this additive, achieving such a value at which the minimum current consumption is ensured.

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