NOVEL LOGIC SWITCHING MODELLING METHOD FOR THREE-PHASE VOLTAGE-SOURCE CONVERTER

摘要

A novel logic switching modeling method for a three-phase voltage-source converter, belonging to the technical field of electric systems. Said method comprises: first, defining a switching signal of a unipolar Boolean logic; second, establishing, by using the Kirchhoff voltage law and current law, physical equations of phase currents and physical equations related to voltages in the three-phase voltage-source converter; then, determining, according to the switching signal, eight power systems, having switching modes, of the three-phase voltage-source converter; and finally, designing, according to the eight switching modes, a Boolean logic switching system in conformity with a discrete logic rule in the three-phase voltage-source converter, so as to obtain a logic switching model having hybrid evolution features of the three-phase voltage-source converter, and performing a stability analysis on the model. The present invention solves the limitation of an approximate linearization modelling method for a three-phase voltage-source converter in the traditional process, so that a switching system consisting of eight subsystems is able to perform a cyclic action within an expected set under the action of a logic switching signal, with the period of each cycle being different.