Pole-assignment based deadbeat control and its stability robustness in an inverter welding power source
ZHU Zhiming, FU Pingpo, XIA Zhuliang, CHENG Shijia
Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
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.
朱志明, 符平坡, 夏铸亮, 程世佳. 基于极点配置的逆变焊接电源最小拍控制及其稳定鲁棒性[J]. 清华大学学报（自然科学版）, 2019, 59(2): 85-90.
ZHU Zhiming, FU Pingpo, XIA Zhuliang, CHENG Shijia. Pole-assignment based deadbeat control and its stability robustness in an inverter welding power source. Journal of Tsinghua University(Science and Technology), 2019, 59(2): 85-90.
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2019, Vol. 59 
