SPWM-H桥变换器中分岔与混沌的自适应载波调幅控制

Adaptive carrier amplitude modulation control of bifurcation and chaos in SPWM H-bridge converter

文中以单相正弦脉宽调制(SPWM)H桥变换器为研究对象,应用分岔图和时域波形图,研究调制过程中载波调幅系数的变化对系统动态行为的影响,并对其进行系统稳定性的数学解析,在此基础上,提出一种自适应载波调幅控制方法,该方法能够依据变换器各参数的变化实时调整载波调幅系数,以保证系统的稳定运行。建立了基于DSP相关实验,在系统混沌时加入文中提出的方法,通过实验验证该方法的有效性。

In this paper,based on the discrete model of single-phase SPWM H-bridge converter,the effect of the variation of carrier amplitude modulation coefficient on the dynamic behavior of system is studied through bifurcation diagram and time-domain waveform.Meanwhile,mathematical analysis of system stability is given,and on this basis,an adaptive carrier amplitude modulation control(CAMC)strategy is proposed,which can adjust carrier amplitude modulation coefficient in real time based on the change of system parameters and ensure the stability of system.Finally,a DSP based relevant experiment is established,and the proposed method is added to the chaos system to verify the effectiveness of this method.