A Cascade Multilevel Converter of Switched Reluctance Motor and Its Control Timing Sequence

A kind of cells cascaded multilevel converter of switched reluctance motor was proposed, which can be made up of low voltage power electronic devices and can be applied to drive high voltage switched reluctance motor. Based on introducing the main circuit topology, the operating modes and the voltage superposition law of proposed converter, the control strategy for the switched reluctance drive by the use of proposed converter was analyzed and a kind of corresponding control time sequence was established. By means of Matlab/Simulink simulation and actual system experiment, the system controlled under proposed timing sequence was validated to have good driving performance. In addition, the experiment result shows that the power converter has almost no harmonic pollution to the power source and has a high grid-side power factor because of employing phase-shifting transformer and multi-pulse rectifier in the input port, the threat against insulation of the motor winding decreased with the lessening of voltage gradient of the motor winding by making the winding voltage to vary in multi-level. Copyright © 2014 IFSA Publishing, S. L.