The Analysis And Repressive Methods Of Overvoltage When HX_D3Locomotive Passing Neutral Setion With Load

This thesis is mainly based on the current situation and development tendency of the electrified railways in China, combined with the characteristics of HXD3heavy-haul electric locomotive and the electric phase with articulate insulation anchor, deeply analyzed and discussed the overvoltage process and its repressive measures when HXD3passes neutral section with load, proposed the types, mechanism and repressive measures when HXD3heavy-haul electric locomotive auto-passing neutral section with load.Firstly described the kinds of electric phase, ways of passing neutral section and its merits and demerits, proposes the main research contents of this thesis, analyzed and confirmed the overvoltage types when HXD3passing neutral section with load combined with the overvoltage theory of the power system; established the lumped parameter equivalent model of locomotive and traction-net with the type of ground switch auto-passing neutral section, according to the process of switching, theoretically analyzed the causes of overvoltage and magnetizing inrush current when auto-passing neutral section, concluded the expression of two kinds of the overvoltage.Then established the single traction converter simulation model with the software SIMULINK based on its actual parameters and control method, and then established the whole simulation model of HXD3within parallel tripled method compared with the actual working conditions of locomotive HXD3running, verified the model accuracy; furtherly established the coupled simulation model of locomotive and traction-net with the type of ground switch auto-passing neutral section, running the simulation model to analyze the overvoltage of the whole process when HXD3auto-passing the neutral section, the simulation results are consistent with the theoretical analysis.Finally proposes the repressive method of overvoltage with the phase-selection thyristor switch, established the simulation model, the simulation results are consistent with the theoretical analysis, verified the feasibility and contrastively analyzed the effect of overvoltage repression with RLC absorption equipment and zinc oxide arrester (MOA).