Real Time Measurements of Aluminum Electrolytic Capacitor Parameters in EVs Inverters

This paper presents a device for estimating internal parameters and predicting the lifespan of aluminum electrolytic capacitors in Electrical Vehicles, without requiring large modifications to the original circuit or control system. By leveraging the bus voltage variation induced when EVs are connected to the grid, the proposed device accurately estimates internal capacitor parameters, facilitating failure diagnosis and lifespan prediction. The effectiveness of the proposed system is validated through mathematical development, as well as comprehensive simulation and experimental results. Overall, this device offers significant advantages in terms of fault diagnosis and lifespan prediction for EV capacitors, that are critical components often associated with faults in power converters.