基于纹波电流计算的面装式永磁同步电机驱动系统逆变器死区补偿

对于电压源型逆变器,由于其功率开关管寄生电容的存在,使逆变器开关周期内输出电压上升和下降不再是瞬时实现,而传统的死区补偿方法并未考虑寄生电容的影响,不仅导致死区补偿效果欠佳,而且存在电流过零点判断困难及易产生过补偿的技术不足。为此,论文首先分析计及开关管寄生电容的逆变器死区效应,然后,针对面装式永磁同步电机(SMPMSM)驱动系统,详细推导其逆变器输出纹波电流的计算公式,提出基于纹波电流计算的逆变器死区补偿方法,并通过基于不同死区补偿方法的SMPMSM驱动系统建模、仿真和实验,验证了所提出的死区补偿方法的技术优势。

The Inverter Dead-Time Compensation of Surface Mounted Permanent Magnet Synchronous Motor Drive System Based on Ripple Current Calculation

For the voltage source inverter, the rising and falling of inverter output voltage can't be realized immediately due to the existence of parasitic capacitor of power switching device. However, for the conventional dead-time compensation method, the effects of parasitic capacitor on dead-time compensation is not taken into consideration, and therefore, results in a unsatisfactory compensation effects, moreover, it exists the technical deficiency of over compensation because the current zero crossing point is difficult to judge. Therefore, the dead-time effect allowing for the influences of parasitic capacitor is first analyzed in this paper, then, for the surface mounted permanent magnet synchronous motor (SMPMSM) drive system, the detailed equations are deduced to calculate the inverter output ripple current, the inverter dead-time compensation method based on the calculated ripple current is then proposed. Finally, for SMPMSM drive systems with different dead-time compensation methods, the technical advantages of proposed dead-time compensation method is validated by system modeling, system simulation and experiment researches.