A PSO-based Fuzzy Hybrid Voltage Modulation Strategy for DC Winding in Wound Field Synchronous Machine

In this paper, a Particle Swarm Optimization-based (PSO-based) fuzzy hybrid voltage modulation strategy is proposed to improve the field winding current dynamics and the steady state electromagnetic torque performance for wound field synchronous machines (WFSMs). It is revealed that unipolar or bipolar voltage modulation strategy has a significant influence on electromagnetic performances of WFSMs. With particle swarm optimization method offline, proper parameters of unipolar and bipolar voltage controllers and the switching criteria between these two modes are designed based on large amount of experimental data. In order to enhance system flexibility and ability to response to variable situations, fuzzy control is utilized online to adjust system parameters automatically. The proposed method can achieve the tradeoff between DC winding current dynamics and torque ripple suppression for the whole WFSM system. All the offline and online results are confirmed by the simulations.