The research for the stability of SPWM inverter affected by digital control

This paper focused on for the stability of spwm inverter affected by digital control. The stability of analog control inverter system, discrete system with no-step-delay control and discrete system with one-step-delay control are analyzed respectively so as to determine the relation of the inverter's sampling period vs. controller parameters with critical stability. Then the essential reason was analyzed why the stability of digital control inverter was degraded compared with analog control inverter even if the sample frequency is ten times greater than the closed-loop bandwidth. The conclusion with realistic instructive significance had been drown clearly that one-step-delay control makes stable range of controller parameter larger than no-step-delay control in some low sample frequency.

[1]  Peng Li,et al.  Effect of Digital Process on the Performance of Pulse Width Modulation Inverter , 2009 .

[2]  Kai Zhang,et al.  Performance analysis and improvement of digital controlled inverter , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[3]  YU Ya-ya.  The Relation Between Stability and the Hold in the Digital Control Systems , 2004 .

[4]  Yu Zhang,et al.  The analysis on effect of digital process on the performance of PWM inverter , 2009, 2009 IEEE 6th International Power Electronics and Motion Control Conference.

[5]  Gene F. Franklin,et al.  Digital control of dynamic systems , 1980 .

[6]  Hongtao Shan,et al.  The research on the digital controlled effect of performance on the PWM inverter , 2008, INTELEC 2008 - 2008 IEEE 30th International Telecommunications Energy Conference.