Research And Design On Dual-power Solid State Transfer Switch Device Based On DSP

It requires an extremely high reliability of the power supply in the occasions of very significant loads such as war industry and electronic manufacturing where power interruption is totally forbidden. So a spare power supply is needed here beside the usual supply to ensure that reliability,thus a fast and trusty device to switch between the two supplies come into demand.Aiming at the driving loads on board including induction motors group,this paper designs and develops a DSP-based solid-state switching device combined with the research,design and manufacture of the BSDB(Bi-board Sources Solid State Switching Device used on Board).Firstly,the thesis proposes the blueprint of the main circuit in the solid state transfer switch device and describes the hardware design of the device and the controlling circuit;Then,in order to restrain the inrush current in the re-switching transient,the change rule of residual voltage of the single induction motor or a motors group is studied;In the phase-control delayed-switching mode,with the phase angles of the residual voltage and the spare supply voltage supervised and the re-switching instant determined through calculation of the vector difference of the residual voltage and the spare supply voltage,the inrush current in the switching transient is effectively restrained.Finally,the paper proposes an instantaneous soft re-switching strategy that can be used under the condition of any residual voltage,and a simulation is carried out using MATLAB.The result verifies that the proposed strategy can still reduce the inrush current even when the residual voltage is in adverse conditions.