无电网电压传感器三电平PWM整流器研究

Research on Three-level PWM Rectifier Without Line Voltage Sensors

在大功率三电平整流器应用中,为降低成本、提高性能,研究了一种无电网电压传感器三电平PWM整流器。在分析其数学模型的基础上,采用三电平SVPWM简化算法,将传统两电平电压空间矢量控制算法应用于三电平,并结合一种新颖的虚拟磁链观测器,提出了基于虚拟电网磁链定向的三电平PWM整流器矢量控制策略,在双三电平变频器系统中对其进行实验研究。实验结果表明,该三电平PWM整流器可较好地稳定直流母线电压,提高整流器功率因数,并具有良好的动静态特性。

n order to reduce the costs and improve the performance of three-level rectifier in the high-power applica- tions,a three-level PWM rectifier without line voltage sensors is researched.Based on the mathematical model of three-level PWM rectifier,the simplified SVPWM algorithm for three-level is adopted which applys the traditional two-level voltage space vector control algorithm, and the novel virtual flux observer is given, the virtual line flux ori- ented vector control strategy is proposed and the experiment is conducted in the dual three-level inverter system.The experimental results show the three-level PWM rectifier can improve the stability of the DC bus voltage,the power factor of rectifier and has good steady and dynamic characteristics.