Torque Feedforward Control based on sudden load change of double PWM permanent magnet electric drive system

Abstract

Aiming at the problem of A sudden change in motor load that the DC bus voltage of the system is greatly fluctuated and the response time is too long under the double PWM permanent magnet synchronous electric drive system, this paper proposes a torque feedforward control algorithm to stabilize the voltage waveform in real time. Firstly, according to the motion control model of permanent magnet synchronous motor, it analyzes in detail the influence of system bus voltage and motor running state after sudden change of motor load. Then, according to the principle of equal power balance, the load torque is converted to the generator side and converted into the required torque current on the power generation subsystem side under the synovial variable structure observer, and the signal is sent to generator through the internal control of the power generation subsystem. Finally, a torque feedforward control strategy is proposed. The control algorithm converts the motor load torque into a reference torque current corresponding to the generator output torque, so as to rapidly adapt to system changes in advance, which makes the generator to adjust the output power in time. And then the motor load torque response time will be shorten . Last but not least, the feasibility of the control strategy is verified by simulation experiments.