Implementation method of vector control of three-phase asynchronous motor

Abstract

The invention discloses an implementation method of vector control of a three-phase asynchronous motor. The implementation method comprises the following steps: through a mathematical model of the three-phase asynchronous motor, omega-vector i<s>-vector psi<r> is taken as a three-phase squirrel-cage-type asynchronous motor state equation of a state variable under a rotating coordinate system; anda three-phase asynchronous motor vector control system, a rotor flux linkage and stator angular velocity calculation module, a rotor flux linkage voltage model, a rotor flux linkage discretization calculation model, a rotor flux linkage given model and PID control with biaxial cooperative amplitude limit are constructed, wherein PID control is divided into outer ring PID and inner ring PID. The implementation method has the beneficial effects that the problem that a rotor flux linkage of a traditional model is rather large due to a slip is effectively avoided, the iron core loss is further reduced, the operation efficiency of the motor is improved, the high-frequency noise amplification effect of differential operation is effectively avoided, it is ensured that the system has the greatestoutput capacity during start or overload operation, meanwhile it is also ensured that the system is not in overload operation for a long time, overload overheating operation of the motor is avoided, and supervoltage operation of the motor is avoided.

Description

technical field [0001] The invention relates to a method for realizing vector control of a three-phase asynchronous motor, in particular to a method for realizing vector control of a three-phase asynchronous motor based on rotor flux orientation. Background technique [0002] During most of the 20th century, the excitation circuit and the armature circuit of the DC motor were independent and had superior speed regulation performance, and the high-performance adjustable speed transmission generally used a DC motor; while the stator circuit and the rotor circuit of the AC motor Strong coupling, multi-variable and non-linear characteristics make speed regulation difficult, and it has long been limited to the field of constant speed transmission. This division of labor according to speed regulation was already recognized by people at that time. It was not until the 1970s and 1980s that with the development of power electronics technology, computer technology, and frequency conve...

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Problems solved by technology

[0004] However, vector control technology is difficult to achieve theoretical results in practical applications. The reasons include: 1) The model of the given rotor flux linkage is unreasonable; 2) The single-loop PID limit cannot make full use of the physical connection between variables under the dual-axis

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