Method and system for detecting a defect on the DC power supply bus of a power converter

A method for detecting a defect on a DC power supply bus of a power converter connected to an electrical distribution network (RD), the power converter comprising a rectifier module (REC) connected to the electrical distribution network (RD) and intended to convert a voltage provided by the electrical distribution network (RD) into a voltage (Vbus) applied to the DC power supply bus, a bus capacitor (Cbus), an inductor (L1) and a precharge circuit connected to the DC power supply bus, the method being characterized in that it comprises:

• determination of a mean value ( V) of the voltage (Vbus) of the DC power supply bus by circuitry,
• determination of a ripple ({tilde over (V)}ppH1) of the voltage (Vbus) of the DC power supply bus by the circuitry,
• monitoring of a variation of the mean value ( V) with respect to the ripple ({tilde over (V)}ppH1) by the circuitry, and
• determination of a defect on the DC power supply bus, by the circuitry, as a function of a rate of the variation, the defect including an anomaly on the inductor (L1) of the DC power supply bus, a power overload of the power converter, or advanced wear of the bus capacitor (Cbus).