PID permanent magnet synchronous motor direct torque control method based on ant colony optimization

Abstract

The invention provides a PID permanent magnet synchronous motor direct torque control method based on ant colony optimization. The method employs ant colonies to set the proportion, differential and integral coefficients of PID to achieve the optimization of a PID controller, and uses the optimized controller to control the direct torque of a permanent magnet synchronous motor. The method comprises the steps of subtracting the theoretically required torque from the current torque obtained by a rotating speed detection sensor to obtain a current torque error and a stator flux linkage error; taking the two errors as the input of a control model, inputting the errors into the PID controller, and obtaining the voltage vector angle and amplitude of the control motor through a transfer functionof the controller to serve as the output of the system. According to the PID permanent magnet synchronous motor direct torque control method based on ant colony optimization, the system is simple, parameter setting is easy to achieve, and meanwhile, the stability and adaptability of the system are high.

Description

technical field [0001] The invention belongs to the technical field of motor control, in particular to a method for direct torque control of a PID permanent magnet synchronous motor based on ant colony optimization. Background technique [0002] The permanent magnet synchronous motor feeds three-phase current into the motor, and a rotating magnetic field is formed inside the motor. The permanent magnet in the rotor rotates in the rotating magnetic field, and finally the rotation speed of the rotor is the same as that of the stator. Direct torque control (Direct torque control, referred to as DTC) is a way for a frequency converter to control the torque of a three-phase motor. The method is to calculate the estimated value of the motor flux and torque according to the measured motor voltage and current. In direct torque control, the stator flux is integrated with the stator voltage. The torque is an estimated value based on the inner product of the estimated stator flux vect...

AI Technical Summary

Problems solved by technology

[0004] Chinese invention patent CN110932635A discloses a method for direct torque control of permanent magnet synchronous motors based on fuzzy control logic. The speed error and stator chain error are input into the fuzzy controller. The training process of this controller is complicated and the system Slow response; Chinese invention patent CN110061669A discloses a direct torque control method for permanent magnet synchronous motors, which uses the signal difference between the stator chain and the feedback stator chain as the input of the super-twisting flux controller, outputs the d-axis voltage vector, and Transform the voltage vectors of the q and d axes through the PARK inverse transformation unit to obtain the α and β axis voltages, and finally generate the PWM control signal. This method requires an accurate control model of the permanent magnet synchronous motor, and the control system is complicated.

[0005] The direct torque control methods of these permanent magnet synchronous motors inevitably have their own defects, which limit the application in electrical engineering and actual production.

It can be seen that the existing direct torque control method of permanent magnet synchronous motor has complex system, low responsiveness, and weak adaptability can no longer meet the requirements, and a direct torque control method based on ant colony optimization PID permanent magnet synchronous motor is adopted

Images