基于免疫算法的三相逆变器最优空间矢量PWM控制

摘要

A novel vector PWM method for three-phase voltage-control inverter is described.The so-called the optimum vector PWM (OVPWM) strategy is characterized by minimum THD of the output waveform of the inverter. The vector and the corresponding time of operation compose the PWM sequences generated by OVPWM. An immune algorithm (IA) optimization technique is applied to determine the time of operation based on the output voltage vector of conventional vector PWM (VPWM). Comparative analysis proving superiority of the OVPWM technique over the conventional VPWM, and the results of the simulation and experiment of inverter confirm the feasibility and advantage of the proposed OVPWM strategy.%提出了一种新的三相逆变器最优空间矢量PWM控制方法,该方法所产生的空间矢量PWM控制序列由空间矢量和作用时间组成.在常规波形最优空间矢量控制相同的控制矢量基础上,采用免疫算法来计算最优的作用时间.给出了算法各个操作步骤和三相逆变器最优控制中的具体实施方法,建立了三相逆变器输出波形的数学模型和免疫算法的各个评价函数,搭建了基于DSP控制器的动态试验平台进行小容量模拟实验.实验和仿真结果证明,该算法所产生的最优PWM控制序列与常规空间矢量控制策略相比能有效地减小逆变器输出波形的总谐波畸变率.