Pole-assignment based deadbeat control and its stability robustness in an inverter welding power source

ZHU Zhiming; FU Pingpo; XIA Zhuliang; CHENG Shijia

doi:10.16511/j.cnki.qhdxxb.2018.26.054

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Journal of Tsinghua University(Science and Technology) ›› 2019, Vol. 59 ›› Issue (2) : 85-90. DOI: 10.16511/j.cnki.qhdxxb.2018.26.054

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Pole-assignment based deadbeat control and its stability robustness in an inverter welding power source

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Abstract

The deadbeat control law was used to control the constant current output of an inverter welding power source based on a full-bridge power converter topology. The controller has good dynamics; however, it is sensitive to changes of the inductance in the output welding loop and is not stable. The cable in the output welding loop of the power source provides an extra parasitic inductance, which leads to instabilities of the deadbeat control system. The pole assignment method was used to improve the deadbeat control and the control system adaptability to inductance variations. Tests show that the control system stability is enhanced by increasing the number of poles as well as the distance between the poles and the origin, but these changes slow the system dynamic response. The compromise between the stability and the response speed is balanced by adjusting the pole locations and the number of poles to provide the desired control characteristics of the welding power source.

Key words

inverter welding power source / deadbeat control / pole assignment / stability robustness / system dynamics

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ZHU Zhiming, FU Pingpo, XIA Zhuliang, CHENG Shijia. Pole-assignment based deadbeat control and its stability robustness in an inverter welding power source[J]. Journal of Tsinghua University(Science and Technology). 2019, 59(2): 85-90 https://doi.org/10.16511/j.cnki.qhdxxb.2018.26.054

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