Research on the pulsation suppression and power parameter matching method for integrated flywheel electric drive systems

To address the issues of torque fluctuation and transient power fluctuation in new energy commercial vehicles, this study proposes an integrated flywheel electric drive system. A unified matching and control method is presented, which integrates six working modes, flywheel parameter design, matching of the main drive motor and control motor, and torque distribution based on quadratic programming into a framework for correlation. Firstly, the flywheel rotational inertia is determined based on representative driving cycle statistical data. Then, the parameters of the main drive motor and control motor are successively matched. Subsequently, the motor loss diagram is embedded in the optimization objective. The joint simulation platform results under the CHTC cycle show that the flywheel rotational inertia under the optimized configuration is 0.13 kg m2, the peak torque of the main drive motor is 224 N m, and the peak torque of the control motor is 75 N m. Compared with the system without the flywheel, this method reduces the peak torque of the main drive motor from 277 to 224 N m, reduces the torque standard deviation from 42.94 to 36.33, and keeps the speed tracking error within ±2 km/h, thereby improving torque stability and overall energy utilization efficiency.