Experimental Study of an Autonomous Power Supply System with a Special Type of Electric Drive

Autonomous power supply systems are widespread in industry and households. Part of the electric transport vehicles and marine power supply systems are also autonomous systems. A characteristic of these systems is their operation with a load of comparable power. A major share of the load is on the controllable electric drive. Variable frequency drives are complex power electronics devices that draw non-sinusoidal current. This, in turn, leads to non-stationary electromagnetic processes and a complex situation in terms of electromagnetic compatibility. More in-depth research into the operation of autonomous synchronous generators is needed. The harmonics on the stator side of the synchronous generator cause mechanical vibrations in its shaft as well as in the prime mover shaft. In this study, the instantaneous values of the voltages and currents are experimentally measured in an autonomous power supply system with a synchronous reluctance motor equipped with a variable frequency drive. Based on these values, quantitative and qualitative indicators of electrical energy are determined, as well as the pulsating torques of the shafts of electrical machines are analyzed.