Speed droop control of integrated modular motor drives

New emission standards are progressively moving transportation systems toward an electrification process that must provide high reliability, fault tolerance and high integration levels. Integrated Modular Motor Drives (IMMD) are an interesting candidate for these applications. Focusing on reliability and fault tolerance, this paper proposes a simple speed droop controller for IMMDs. Extending the concept of droop control to the speed loop of an IMMD, inherent power sharing among the modules and regulated speed are achieved without communication. The paper proposes a simplified design procedure, validated with experimental results from a 3KW rig, showing good agreement with the expected performances.