<span>In recent years, modular multilevel converters (MMC) have become one of the most popular converter topologies. Despite its growing popularity, MMC is still less widespread in variable speed drives (VSDs) applications. The reason for this that voltage ripple submodules (SM) increases during low-speed constant torque operation. In paper, carrier phase shift-pulse width modulation (CPS...

As well known, ground fault circuit interrupters (GFCIs) are used to protect people from electric shock. Recently, a manufacturer installed variable speesd drives (VSDs) in all their products. After receiving feedback from their customers, they realized that their products would only work when powered through some GFCI outlets but not work when powered through others. To investigate this proble...

This work represents a mathematical analysis and simulation of dc-motor electric drive control system with variable moment of inertia. A separately-excited dc motor is used in this control system. A mathematical model for this motor has been simulated and tested in Matlab/Simulink. A closed-loop control system for this dc electric drive system is proposed. The proposed control system is based o...

Shaft position sensing is an essential part of switched reluctance (SR) motor drive In order to synchronize the pulses of phase current with the period of rising inductance of the proper motor phase. Direct sensors such as, Hall effect and optical encoder are commonly used in SR motors. The purpose of this paper is to present an indirect shaft positioning sensing known as "sensorless " control ...