Current Control Method and Current Controller of Induction Motor Based on Predictive Method

Abstract

The invention discloses a current control method of an induction motor based on a forecast mode, and a current controller of the induction motor. According to the method and the current controller, stator M shaft voltage and stator T shaft voltage which are used for controlling stator M shaft current and stator T shaft current of the induction motor can be obtained according to a received stator M shaft setting current signal, a received stator M shaft feedback current signal, a received stator T shaft setting current signal, a received stator T shaft feedback current signal, induction motor parameters R1, R2, Ls, Lr and Lm as well as an induction motor rotor angle speed omega 1; control hysteresis is avoided; and the method is simple and practicable.

Description

technical field [0001] The invention relates to a current control method and device for an induction motor. Background technique [0002] In the vector control system of the induction motor, most of them adopt the two-loop control form. The inner loop is the current control loop (or torque control loop), and the outer loop is the speed control loop. The most critical control module is the current control module. (Or called the torque control module), the dynamic and steady-state performance of the current control module directly determines the performance of the entire induction motor drive system. At present, the current control module is more common in the PID control (proportional-integral-derivative control) mode or the improved PID control mode. This mode is mature and stable in technology and widely used, but it also has the following problems and deficiencies: [0003] 1. The parameter adjustment process of the PID method is relatively complicated, and professional a...

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Problems solved by technology

[0003] 1. The parameter adjustment process of the PID method is relatively complicated, and professional and technical personnel with certain experience are required to complete it;

[0004] 3. PID control is essentially hysteresis control, which determines that its dynamic response performance is not good, it is easy to produce overshoot or callback, and the cut-off frequency of its amplitude-frequency characteristics is low;

[0005] 2. Even for professional technicians, the debugged PID parameters may not be suitable in some occasions, which may lead to current oscillation or out of control, and then cause the power module of the vector control system to alarm or even be damaged.

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