Modeling of the four quadrant SCR based DC drive system

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Dr. Veszprémi Károly
Department of Electric Power Engineering

At the faculty laboratory, load torque is provided by a DC-machine during load motor tests taken using the squirrel-cage induction motor. The squirrel-cage induction motor connects to the three-phase system via a toroid. The DC-machine is linked to a three-phase system, whose voltage is reduced by a transformer, via a four quadrant SCR based DC-drive.In my thesis, the power group, the four-quadrant drive and its controller, also the current and speed control of the machine were all modelled using MATLAB Simulink and its Stateflow and Simpower extensions. The drive was simulated both with and without circulating current operation. The model was then used to take measurements. The speed-torque curve was laid down in the torque range coverable with the DC-machine, the circulating currentrelative to the firing angle was measured, similarly to the rise up and the setting time of the controllers. The model was set up in discreet time, with a sampling time of 10-5. I strived to meticulously deduct the mathematical and physical interdependences used while modelling, in order to avoid merely referring to the used relationships during the execution.


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