Research on Modeling and Control Strategy of Electric Drive System of Electric Vehicle
The electric drive system of pure electric vehicle is affected by the time-varying characteristics of moment of inertia at the load end and the flexibility in the transmission parts,which leads to the motor end torque fluctuation and transmission preci-sion reduction.A control strategy is proposed by adding notch filter and feedforward adjustment gain.Compared with the tradi-tional method,this method needs to configure fewer parameters and has higher control precision.Firstly,the dynamic equation of the electric drive system based on the Two-inertia system is established,and the frequency response of the system under different load moment of inertia is analyzed.Two kinds of notch filters are designed according to the Two-inertia system of electric drive system.By comparing the parameter change and response curve of the system with the notch filter,a better notch filter is selected.Finally,the control system with notch is improved by feedforward control and gain adjustment.The theoretical analysis process and parameters design method of the improved control strategy are given,and a series of simulations is carried out.The results show that the proposed method can reduce the torsional vibration and transmission precision of the electric drive system of pure electric vehicle due to the transmission flexibility and the time-varying characteristics of the moment of inertia at the load end of the motor.
NETL
NSTL
万方数据
维普
