基于PSO算法的三电平优化PWM方法

受大功率开关器件开关频率的限制，牵引逆变器输出波形中含有大量的谐波，所以有必要采用优化的脉宽调制（ PWM ）方法来减少牵引逆变器输出波形的谐波。首先，建立了最小电流总谐波畸变率（ THD ）谐波优化模型，并采用粒子群优化（ PSO ）算法对模型进行求解。其次，在分段同步调制的不同分频段上对PSO-PWM和传统正弦脉宽调制（ SPWM）进行了比较，得到PSO-PWM具有良好谐波优化效果的结论。最后，用仿真和半实物实验结果验证了理论分析的正确性。

A Three-level Optimal PWM Method Based on PSO Algorithm

Due to the switching frequency limitation of high power switch devices, traction inverter output waveforms contain a lot of harmonics. So it is necessary to use the optimal pulse width modulation(PWM) technique to reduce the harmonics of traction inverter output waveforms. Firstly, this paper applies particle swarm optimization (PSO) algorithm to the solution of optimal PWM problem, and develops the current total harmonic distortion (THD) minimization optimization model. Secondly, this paper gets the conclusion that optimal PWM has good harmonic optimization effect through the comparison of conventional SPWM method and optimal PWM method under different subsections of subsection synchronous modulation. Finally, the simulation and hardware-in-the-loop (HIL) experiment results verify the accuracy of theoretical analysis.