Permanent magnet synchronous motor sliding mode control method based on improved variable gain reaching law

Abstract

The invention discloses a permanent magnet synchronous motor sliding mode control method based on an improved variable gain reaching law. The defects that in a traditional sliding mode control method based on an exponential reaching law, high-frequency buffeting is serious, and the convergence speed is low are overcome. The method comprises the following steps: firstly, optimizing an exponential reaching law using a fixed gain into an improved variable gain reaching law using an adaptive gain; then, constructing an extended state observer, and observing system disturbance and rotor angular velocity; then, constructing a speed controller of the permanent magnet synchronous motor based on an improved variable gain reaching law and an integral sliding mode surface, and taking an output value of the extended state observer as compensation of the speed controller; and finally, applying the controller and the observer to a vector control system of the permanent magnet synchronous motor. Compared with a traditional permanent magnet synchronous motor sliding mode control method, the permanent magnet synchronous motor sliding mode control method has the advantages that the high-frequency buffeting phenomenon can be better restrained, the response speed is increased, and therefore the response speed and the steady-state performance of a permanent magnet synchronous motor speed regulation system are improved.

Description

technical field [0001] The invention relates to the technical field of control of a permanent magnet synchronous motor, in particular to a sliding mode control method of a permanent magnet synchronous motor based on an improved variable gain reaching law. Background technique [0002] Permanent magnet synchronous motor has the advantages of simple structure, high operation reliability and high power density, so its application field is very wide. At present, the current controller with proportional and integral adjustment characteristics is commonly used in the permanent magnet synchronous motor speed control system. This method is simple in algorithm and easy to realize parameter adjustment, and can meet the control requirements of the permanent magnet synchronous motor within a certain range. However, the permanent magnet synchronous motor is a nonlinear, strongly coupled, multi-variable complex system. The current controller with proportional and integral adjustment chara...

Images