关键词: 特定谐波消除脉宽调制, 七电平逆变器, 蛇优化算法, 开关角求解

Abstract: The specific harmonic elimination pulse width modulation ( SHEP WM) in the control strategy of multilevel inverters can obtain better voltage output waveforms at lower switching frequencies, with a focus on obtaining the switching angle. An improved snake optimization algorithm was proposed for solving the switching angle of multi-level inverter SHEP WM modulation. Tend chaotic mapping was used for the initial population of the traditional snake optimization algorithm to make the initial population distribution more uniform. The Levy flight strategy was introduced to enhance the global search ability of the algorithm, which could more accurately and quickly obtain the optimal solution of the global switch angle. Simulation results show that the improved snake optimization algorithm can better eliminate low order harmonics and reduce the distortion rate of the output line voltage compared to traditional algorithms, fully verifying the feasibility of the method.

Key words: selected harmonic elimination pulse width modulation ( SHEPWM ), seven level inverter, snake optimization( SO) algorithm, switch angle solving