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电动车辆磁悬浮飞轮储能电池的充放电过渡态很快,其双向PWM变换器的死区会给飞轮电动机带来输入谐波、脉动转矩等负面作用,采用适宜的变换器死区补偿控制是实现飞轮高速稳定运行和能量有效转化的关键。在对车载磁浮飞轮装置的系统构成、功率匹配和死区机理的分析基础上,通过对其双向变换器的过渡时态、死区系数和补偿方法的研究,提出一种优化的动态对称死区补偿法。该方案基于变换器在旋转坐标系下的电流矢量方向判断,确定补偿方向并使指令PWM波形对称于开关周期的中心;得出基本电压矢量作用时间的算式并进行试验。研究结果表明:调整补偿深度可优化飞轮双向变换器的补偿效果;该方法解决了相电流波形的交越失真问题,抑制电动机的转矩脉动,有助于磁浮飞轮变换器实现可靠的能量转换。
The charge-discharge transient state of the magnetic levitation flywheel energy storage battery for electric vehicles is very fast. The dead zone of the bidirectional PWM converter brings negative effects such as input harmonics and pulsating torque to the flywheel motor. The adaptive dead zone compensation control of the converter is The key to achieve high-speed flywheel stable operation and energy conversion. Based on the analysis of the system constitution, power matching and dead-zone mechanism of the vehicle-mounted maglev flywheel device, an optimized dynamic symmetrical dead zone is proposed by studying the transient state, dead zone coefficient and compensation method of the bidirectional converter. Compensation Act. Based on the current vector direction of the converter under the rotating coordinate system, the scheme determines the compensation direction and makes the command PWM waveform symmetrical to the center of the switching cycle. The calculation formula of the basic voltage vector action time is derived and tested. The results show that the compensation depth can be optimized by adjusting the compensation depth. This method solves the problem of crossover distortion of phase current waveform, restrain the torque ripple of the motor and help the maglev flywheel converter achieve reliable energy conversion.