Transition Control to Direct Transmission Mode of Matrix Converter for Flywheel Drive System without Rush Current

Abstract

A problem with an energy storage system with a flywheel is the larger power consumption during standby as compared with that of a battery or an EDLC. In order to reduce power consumption, a direct transmission mode of a matrix converter, in which the power grid is directly connected to an induction motor, is applied. However, a rush output current will occur in the matrix converter when the mode of the matrix converter is changed from the PWM mode to the direct transmission mode. In order to solve this problem, in this paper, a transition control using an AC chopper mode is proposed. In addition, the validity of the proposed control is experimentally demonstrated. Finally, the power loss of the matrix converter is analyzed for both a vector control and the direct transmission mode.