Abstract
A welding power source is commonly assimilated to a non-linear load. Arc welding market being in full growth, the resulting harmonic pollution is becoming an increasingly difficult problem to ignore. Therefore, the main purpose of this work is to define and implement the most suitable solution for power factor correction in a welding power source. Due to the high non-linearity of the electric arc, the current controller used to control grid current need to show high robustness. Consequently, this paper focuses on the digitization of a very robust Phase-Shift Self-Oscillating Current Controller (PSSOCC), which only exists in its analog version until then, to carry out this task. After quick descriptions of the entire energy conversion chain and the PSSOCC operation principle, a model of the digital PSSOCC is proposed. Then, the quality and the accuracy of the aforementioned model are evaluated and its operating limits are identified. Afterwards, the behavior of the digital controller is studied within a Power Factor Correction (PFC) regulation for several specific arc welding operating modes. Finally, excellent robustness of this new FPGA-based digital current controller, named DPSSOCC, is confirmed on a three-phase Vienna converter test bench.
Highlights
The global welding market size was $ 19.53 billion in 2019 and forecast to reach more than $ 25 billion by 2027 [1]
This paper focuses on the digitization of a very robust Phase-Shift Self-Oscillating Current Controller (PSSOCC), which only exists in its analog version until to carry out this task
Energies 2021, 14T, xhFOeRDPEPERSRSEVOIECWC regulation remains very efficient during load impacts.21Tohf e25se latest results allow us to definitively validate the choice of the Digital Phase-Shift Self-Oscillating Current Controller (DPSSOCC) for the control of the
Summary
The global welding market size was $ 19.53 billion in 2019 and forecast to reach more than $ 25 billion by 2027 [1]. At the European scale, 2018 sales reached € 2 billion [2]. In addition being important, the welding market is in full expansion. The origins of this strong growth can be explained by many factors. The huge diversity of areas using arc welding devices such as automotive industry and building trades, and the diversity of arc welding techniques are the most relevant. With the current trend dealing with arc welding automation, robotized welding parks are becoming more and more common
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