【摘要】 考虑到三相电压型PWM整流器结构与交流电机的电路结构比较相似,提出基于虚拟磁链三相电压型PWM整流器模型预测直接功率控制。采用虚拟磁链定向来对PWM整流器进行控制,不仅继承了模型预测直接功率控制的优点,还省去了交流测电压互感器,节省了空间和成本,并通过二阶拉格朗日插值法进行功率修正。仿真结果表明,该方法具有良好的动态和稳态性能,具有很好的鲁棒性,实现了固定开关频率,有效降低了交流侧电流总谐波失真(THD),提高了交流侧功率因数。更多还原

【Abstract】 Considering the similarity of three-phase voltage source PWM rectifier structure and the circuit structure of AC motors,a scheme on the model predictive direct power control model predictive for three-phase voltage source PWM rectifier base on the virtual flux was proposed. By using the virtual flux orientation to control the PWM rectifier,not only inherited the advantages of model predictive direct power control,but also eliminated the AC side voltage sensors,which reduced the space and cost,and by using the second order Langrange interpolation method to correct the power. The simulation results showed that this scheme has better dynamic performance and static performance; the system has good robustness; it could reduce the Total Harmonic Distortion( THD) of AC-link current effectively and could improve the power factor of AC-link.更多还原