Brush wear modeling of doubly-fed induction generator under special circumtances

Aiming at the problem of increased brush wear, shortened brush replacement cycle and unconfirmed wearing quantity under complex marine environment, wear experiment platform of brush and slip ring system based on salt spray tester was established. Contact current, contact pressure, salt spray concentration and experimental temperature experiments were conducted by the developed test platform combining salt spray test machine and YKYF1500 - 4 asynchronous air-cooled Doubly-fed wind generator brush and slip ring system. Based on friction model and wear theory, an improved Coulomb-viscous friction prediction model for brush wear was established, and contact current, contact pressure, salt spray concentration and experimental temperature were introduced into the wear model. Through the particle swarm parameter identification method, the model parameters related to contact current, contact pressure, salt spray concentration and experimental temperature were identified to realize the prediction of brush wear. The model can predict the brush wearing capacity under different contact current, contact pressure, salt spray concentration and experimental temperature working conditions. This provides a theoretical basis for the operation and maintenance personnel to formulate the inspection cycle. © 2022 Editorial Department of Electric Machines and Control. All rights reserved.