关键词: 特定谐波消除脉宽调制, 黑寡妇优化算法, 克隆选择算法, 开关角求解, 七电平逆变器

Abstract: To address the issues of weak global search capability and unstable iterative results in the traditional black widow optimization algorithm ( BWOA ) for solving switching angles in the selective harmonic elimination pulse width modulation ( SHEPWM) strategy of cascaded H-bridge inverters, an improved SHEPWM strategy based on the modified BWO algorithm was proposed. An enhanced cloning algorithm was introduced during the global search phase of the traditional
BWO, employing the nearest-better clustering ( NBC) strategy to generate sub-populations and strengthen multi-dimensional search capabilities. Differential evolution ( DE) was also incorporated to increase the iteration speed of the algorithm. An improved black widow algorithm for solving the switching angles in cascaded H-bridge inverter SHEPWM modulation was proposed to enhance global search ability and avoid local optima. Simulation results show that the improved algorithm increases the accuracy of switching angle solutions for SHEPWM modulation, enhances the elimination of specific harmonics and reduces output voltage distortion. The results verify the feasibility and effectiveness of the proposed control strategy.

Key words: selective harmonic elimination pulse width modulation( SHEPWM), black widow optimization algorithm( BWOA), clonal selection algorithm( CSA), switching angle calculation, seven level inverter