Vybrane dynamicke jevy trakcniho pohonu s asynchronnim motorem.

The thesis deals with selected operation states of a traction drive with an asynchronous motor, which is fed from a voltage source converter. The following phenomena are examined: the response of the drive on step changes of required output quantities from the master control system (the required voltage magnitude and the rotor frequency), short-term blocking of all converter transistors and subsequent operation resumption while the rotor magnetic flux still exists, the short-circuit in the DC link of the converter, the interruption of energy supply into the DC link of the converter caused by crossing a long section without energy supply or by a trolley bounce. Not only does the thesis describe the problematic phenomena, but it also suggests the measures and control interventions, which help either to forestall these disturbances or soften their negative consequences, or eventually totally inhibit their appearance. The 1st chapter is dedicated to the creation of a mathematical model of the traction drive which is controlled by a selected regulation structure of the vector control. The 2nd chapter is focused on the explication of physical principles of the simulated transient phenomena occurring during the traction drive operation with an asynchronous motor of the power equal to 120 kW. In the final part of the thesis, the conclusions indicated in the previous chapters are verified by help of measurements performed on the laboratory physical model with rated power equal to 4,5 kW.Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi