Lina Alhmoud
Converter, DFIG, Kalman filter, extended Kalman filter, IGBT,lifetime, reliability
The readiness and availability of power electronic converters under harsh and uncertain conditions in wind energy conversion system (WECS) environments are subject to condition monitoring and health management. The on-state voltage VCE(ON) online measurements is a promising method for obtaining a thermal sensitive electrical parameter for wire-bond lift-off. This parameter demonstrates a good correlation with junction temperature. An extended Kalman filter (EKF) is used as an accurate and robustness algorithm in the estimation of the junction temperature of high-power insulated-gate bipolar transistors (IGBTs) under thermal path degradation conditions. EKF is recognized to include system uncertainties in noisy environments. Hence, a health reliability–monitoring framework is proposed in this paper, based on the EKF algorithm to increase the accuracy of IGBT junction temperature evaluation from VCE(ON). A complete WECS model is established in MATLAB/Simulink that includes a doubly fed induction generator, pitch control system, drive train model, and aerodynamic model. This model is connected to the grid via an average model of a three-phase converter to represent the thermal modelling and lifetime estimation.
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