基于三电平逆变器直接转矩控制的开关矢量优化

Switch Vector Optimization of Three-level Inverters for Direct Torque Control

研究了二极管中点箝位型三电平逆变器的优化控制策略。在直接转矩控制系统中,基于新型固定矢量合成方法,采用多级滞环比较器,更加充分有效地利用合成矢量对开关矢量进行优化,从而减小转矩脉动,提高系统响应速度。通过Matlab仿真,验证了该方法设计合理,与传统系统相比,优化后系统的控制性能明显提升。

This paper studies the optimized control strategy of the neutral point diode clamped （NPC）three-level inverter. Based on the fixed vector synthesis method, the switch vectors are optimized to decrease the torque ripple and improve response speed by means of the multi-level hysteresis comparators and the synthesized vectors. Matlab simulation result proves that the optimi- zing method features significantly improved control performance compared to conventional system.