Investigation of complex of resistance welding machines by means of simulation modeling
DOI:
https://doi.org/10.31498/2225-6733.38.2019.181483Keywords:
resistance welding machine, power supply, unbalanced load, synchronization device, unbalance coefficientAbstract
In the article, the operation of a electrotechnical complex of single-phase resistance welding machines from the point of view of their influence on the symmetry and fluctuations of the grid voltage, especially in conditions of a «weak» grid, is investigated. Uneven distribution of resistance welding machines across the phases of the power supply grid, the random nature of their turn-on instants and the non-stationary mode of operation lead to the appearance of voltage unbalance. The deterioration of the quality of the supply voltage, in turn, affects the quality of welded joints. For example, the 15% voltage sag leads to 100% bad quality welds, furthermore, for corrosion-resistant steels, a 10% voltage sag will lead to 100% bad welds. Thus, the solution of the problem of ensuring electromagnetic compatibility of welding equipment with the electric grid is an urgent scientific and technical problem. A method is proposed for reducing the negative impact of an electrotechnical complex of resistance welding machines on symmetry and voltage fluctuations by installing technical means for selecting the pair of phases that each resistance welding machine is powered by, and by using centralized control of their control systems. This ensures that the load distribution between phases of the supply grid is as close as possible to the balanced one, and the choice of a pair of phases for powering each resistance welding machine of the electrotechnical complex is done immediately before the start of the welding cycle (while the supply current of the machine is close to zero). This can significantly increase the service life of switching equipment. The results of modeling a typical set of resistance welding machines powered by a «weak» supply grid (the machines total rated power is about 5% of the short circuit power) showed that the proposed approach allows for reducing the voltage unbalance coefficient by a factor of more than 2References
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