Input-Output Linearization and Stabilization Analysis of Internal Dynamics of Buck-Boost Converters
Using the state-space average modeling method, a nonlinear affine model of Buck-Boost converter is set up. Based on the input-output linearization method of differential geometry theory, the internal dynamics of the systems, with output represented by inductor current and capacitor voltage respectively, are been studied. It is pointed out that the average PWM model of the ‘Buck-Boost’ converter, with output represented by the average capacitor voltage, is actually a nonminimum phase system, and its internal dynamics is unstable. So, it is unfeasible to control the output voltage directly. But, if the output is represented by the average inductor current, the system is a minimum phase system, and its internal dynamics is asymptotically stable. It is feasible to control the output voltage indirect through the regulation of inductor current. Further, the nonlinear state feedback law is proposed. The control law proposed in this paper has some advantages of being simple, easy to implement. The validity of the indirect output capacitor voltage control scheme using input-output feedback linearization method is verified by numerical simulation results. Key waveforms based on simulated extensive work verify the superiority of the proposed nonlinear control method.
Buck-Boost converter nonlinear input-output linearization internal dynamics stabilization
Dingxin Shuai
College of Electrical and Information Engineering, Panzhihua University, Panzhihua 617000, China
国际会议
The 31st Chinese Control Conference(第三十一届中国控制会议)
合肥
英文
1013-1017
2012-07-01（万方平台首次上网日期，不代表论文的发表时间）