Research On High Performance Control Algorithm Of Permanent Magnet Synchronous Electric Drive System Based On Active Disturbance Rejection Observer

Permanent magnet synchronous motors have obvious advantages such as simple structure,reliable operation,high efficiency,high power factor,large starting torque,small size,and good energy performance indicators.They are widely deployed in new energy vehicle electric drives.The proposal of vector control makes the speed regulation performance of permanent magnet synchronous motor achieve a qualitative leap.Vector control technology decomposes the stator current into excitation and torque components to achieve independent control of flux and torque.However,due to the influence of inductance and digital control delay,there is control between the two subsystems of the d-and q-axis.Cross-coupling,especially in dynamic processes or high-frequency operation.Due to the cross-coupling effect,any dynamics that occur in one control subsystem will inevitably cause disturbance to the other subsystem,prolong the dynamic response process,and reduce system performance.Therefore,it is of great significance to study the high-performance control algorithm of permanent magnet synchronous electric drive system.This paper focuses on the control algorithms such as current loop decoupling and disturbance suppression for permanent magnet synchronous electric drive systems,with a view to comprehensively improving the operating performance of the current loop,and thus promoting the overall improvement of the operating performance of electric drive systems.In this regard,the main research work of this article is as follows:1)Firstly,the basic mathematical model of the permanent magnet synchronous motor is established,and the vector control strategy of the permanent magnet synchronous motor and the parameter tuning of the current regulator are introduced.2)Secondly,the complex vector analysis method is introduced,the complex vector model of the permanent magnet synchronous motor is established,the transfer function of the system is derived,and the current coupling and delay problems are theoretically analyzed.In view of the above problems,the closed-loop zero-pole distribution diagram and the Bode diagram using different decoupling strategy systems are drawn,so as to analyze and discuss the decoupling characteristics of several decoupling control strategies.Compared with feedforward decoupling control and feedback decoupling control,internal model decoupling control,deviation decoupling control and complex vector decoupling control are more robust.3)Finally,aiming at the problem of gain mutation at the switching point of the fal()function of the conventional extended state observer(ESO),a novel continuously differentiable nonlinear function is found to form the new ESO.The desired characteristic of the fal()function,i.e.lower gain to bigger error and higher gain to smaller error,is improved,in addition to that jump of the gain at the switching point is avoided.Meanwhile,the proposed error correction function can be uniformly represented with a mathematical equation,avoiding switching action between two different mathematical equations.On this basis,an ESO with continuous gains is proposed and based on the observer a new current decoupling control strategy is presented.This method obtains comprehensive observation and compensation of disturbance caused by resistance voltage drop,cross-coupling,and other certain and uncertain factors through ESO,which improves the current decoupling effect and the anti-interference ability of the system.Design of the parameters involved in the ESO,as well as its stability are discussed.4)Based on MATLAB/Simulink simulation model and experimental platform,the proposed scheme was simulated and experimentally verified.