三相逆变器并联驱动系统环流的研究

Research of circulation current parallel three-phase inverters drive system

三相逆变器并联驱动系统能有效地为大功率电机驱动提供能量,但同时也带来环流问题。环流会使得三相电流波形畸变,导致电机转矩输出波动,降低电机效率。鉴于此,首先基于坐标变换将ABC三相交流分解为dq0直流,并在此基础上建立了共直流母线三相并联逆变器等效电路模型;然后,研究了并联环路不同参数对环流影响;最后,基于并联逆变器驱动系统实验验证了文中理论及仿真分析的正确性。

The parallel three-phase inverters drive system can provide energy tor the motor drive system effectively. However, the circulation current problem will occur. The circulation current will distort the three-phase current, resulting in torque fluctuation and decreasing in the motor efficiency. Based on the coordinate transformation, the three-phase AC current in ABC coordinate system is transformed to DC current in dqO coordinate system. Then, the equivalent circuit model of the parallel three-phase inverter is set up with common DC buses. The influence of the different parameters of the parallel loop path on circulation currents is studied. Based on the parallel inverters drive system, the experiments are carried out to validate the correctness of the theory and simulation analysis.