How can I stabilize DC-DC boost converter with (non-minimum phase)?

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Mojtaba Forouzesh

Dear Mustafa,

As you mentioned there is at least one RHP zero in the control to output transfer function of boost type converters. This is mainly because of the inductor and/or coupled inductor at the input side of these types of power converter. (note that boost converters with switched-capacitor techniques show MP characteristics).

To completely gain insight of the frequency and dynamic characteristics of a particular converter you must perform small-signal modeling on the converter and do some analysis (you can find one approach in this paper: "M. Forouzesh, Y. P. Siwakoti, F. Blaabjerg and S. Hasanpour, "Small-Signal Modeling and Comprehensive Analysis of Magnetically Coupled Impedance-Source Converters," IEEE Trans. Power Electron., vol. 31, no. 11, pp. 7621-7641, Nov. 2016.").

In addition, you may take a look this paper: "M. Forouzesh; Y. P. Siwakoti; S. A. Gorji; F. Blaabjerg; B. Lehman, "Step-Up DC–DC Converters: A Comprehensive Review of Voltage Boosting Techniques, Topologies, and Applications," IEEE Trans. Power Electron., vol.PP, no.99, pp.1-1, 2017", there is a subsection regarding MP and NMP characteristics of boost converters and some of the major old and recent approaches (topology improvements or control techniques) are discussed there.

I hope you find more information in those papers, both are open access, so enjoy reading.

Best regards,

Mojtaba

Byron Cajamarca

I am working with a Buck & Boost converter which has the characteristic of non minimum phase, effectively when using a classic PID controller the system is destabilized, it is necessary to use a Linoya & Alpeter scheme to solve this problem, in my case I have had a good answer, now if what you want is to increase the robustness of the system I have made a combination of the Linoya and Alpeter scheme with a DSMC (Dinamic Sliding Mode Control) controller, in the future I will be doing an article to present my results, but I would advise using the Linoya scheme for your case.