Unbalanced switching effects on dynamic performance of an isolated three-phase self-excited generator

This paper presents dynamic performance of an isolated three-phase self-exc ited reluctance generator (SERG) tinder sudden disconnection of single-phas e loads and excitation capacitors. A novel approach based on three-phase re luctance machine model is employed to derive dynamic equations of a stand-a lone SERG under different unbalanced conditions. Experimental results obtai ned from a laboratory 0.37 kW reluctance machine driven by a DC motor are a lso performed and compared with the simulated results to validate the effec tiveness of the proposed method. It can be concluded from the analyzed resu lts that the stator current unbalanced factor for the loaded SERG under swi tching off one excitation capacitor is much larger than the one under switc hing off one or two resistive loads. The voltage unbalanced factors for the loaded SERG under switching off one excitation capacitor or switching off one or two resistive loads are very similar. Moreover, the terminal voltage of a loaded SERG cannot be generated when two excitation capacitors are si multaneously switched off.