A Harmonic Suppression Strategy for Doubly Salient Electromagnetic Generators Based On PWM

Due to their non-sinusoidal waveform armature currents, the control strategies for doubly salient electromagnetic generators (DSEGs) are different from control strategies applied on regular generators such as permanent magnet synchronous generators. The popular control strategies in DSEGs now are angular position control (APC) and pulse width modulation (PWM) control. These two control strategies improve the output performance of DSEG systems to some extent but also bring some distortion to the armature currents, and lead to some reduction of the efficiency and reliability of the DSEGs. A harmonic suppression strategy is proposed in this paper to shape the armature currents to sinusoidal as much as possible to decrease the loss caused by harmonic, and the efficiency of the DSEG is also improved.