Asynchronous motor self-adaptive vector control system with stator temperature online monitoring function

Abstract

The invention relates to an asynchronous motor self-adaptive vector control system with a stator temperature online monitoring function. The system comprises a rotor magnetic field accurate orientation module used for carrying out accurate orientation of a rotor magnetic field based on load angle compensation correction according to a current and voltage signal under a d-q synchronous rotating coordinate, a stator flux linkage adjusting module used for carrying out closed-loop control of a stator d-axis flux linkage and correcting stator resistance identification, a stator voltage decoupling module used for decoupling a d-axis voltage and a q-axis voltage, a stator resistance voltage drop compensation module used for compensating the stator resistance voltage drop according to the output result of the stator flux linkage adjustment module, and a stator winding temperature monitoring module used for monitoring the temperature and the temperature rise of a stator winding online accordingto the stator resistance identification correction result. Compared with the prior art, the method has advantages of accurate rotor magnetic field orientation, accurate flux linkage estimation, simple voltage decoupling, convenient stator winding temperature monitoring and the like.

Description

technical field [0001] The invention relates to the technical field of asynchronous motor monitoring, in particular to an asynchronous motor self-adaptive vector control system with online stator temperature monitoring. Background technique [0002] Rotor field-oriented vector control of asynchronous motors with frequency conversion and speed regulation can transform the inherent nonlinear mechanical characteristics of asynchronous motors into linear mechanical characteristics similar to those of DC motors, and the current and flux linkages are completely decoupled, enabling the speed control of DC motors Basic conditions for good performance. Therefore, rotor field orientation is the most worthy of in-depth research and perfect control technology in the vector control of asynchronous motors. However, during the decades of development of the rotor field oriented vector control technology, due to the influence of the motor rotor resistance Rr and the time constant Tr greatly...

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Problems solved by technology

The obvious disadvantage of this type of method is that it greatly increases the complexity of the control system, and may even have serious negative effects on the stability, reliability, speed and accuracy of the control system

[0004] 2. Various flux observation techniques, such as full-order state observers, sliding mode observers, Kalman filters, model reference observers, etc., still have various problems. In the research and experiment stage, there is still a long way to go for the accurate observation of the magnetic flux of the AC motor

At present, two methods are often used to monitor the temperature of the stator winding: one is to embed a temperature sensor in the winding, which can only obtain the local temperature detection value of the winding, and increases the cost and source of failure; the other is the indirect estimation method, It is divided into model loss estimation method and winding resistance variation estimation method with temperature

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