An Enhanced Distributed Control Architecture of Multiple Three-Phase PMSG for Improving Redundancy

Multiple three-phase permanent magnet synchronous generator (MTP-PMSG) has excellent fault-tolerant features in theory. However, the commonly used control architectures, such as the centralized control architecture with only one central controller and the distributed control architecture where the interconnected communication cables between controllers may fail, limit the fault tolerance of MTP-PMSG. Therefore, this paper proposes an enhanced distributed control (EDC) architecture without interconnected communication cables of MTP-PMSG for improving redundancy. The sensorless control and harmonic current suppression algorithm are considered and implemented in the EDC architecture. First, this paper analyzes the magnetic field coupling between the winding sets of MTP-PMSG, and the variation law of equivalent inductance of the winding sets under the condition of arbitrary current sharing is obtained. Then, an enhanced distributed sensorless control (EDSC) method in EDC architecture is proposed based on the equivalent inductance. Furthermore, this paper proposes a model-free predictive harmonic current (MFPHC) suppression method to solve the MTP-PMSG's inherent harmonic problem in the EDC architecture. The effectiveness of the proposed methods is verified by the comparative simulations and experiments in a dual three-phase PMSG (DTP-PMSG) with arbitrary current sharing of winding sets.