Electricite De France

Converteam Technology Ltd.

Ge Energy Power Conversion Technology Gmbh

Université D'artois

Valentin Costan

Bernard Gollentz

Philippe Guuinic

Jalal Cheaytani

Jean-François Brudny

Maxime Dessoude

A method for monitoring and detecting defects in a doubly-fed asynchronous machine including a stator and a rotor, said method implemented by computer means. The method comprises: a. receiving a current and a voltage measurement of the stator, and a measurement of relative rotation speed between the stator and the rotor; b. deducing a stat or power as a function of time; c. performing a harmonic analysis on the resulting stator power including applying a wavelet transform to the stator power; d. comparing the resulting harmonic representation to a reference harmonic representation, where said reference harmonic representation is selected as a function of the rotation speed measurement, so as to detect possible defects in said machine as a function of possible differences identified by the comparison.

Electrical defect detection in a generator

A system for converting at least one electrical input direct current into an electrical output alternating current comprising M phases and supplied to M output terminals includes N polyphase inverters, connected in parallel, each converting the input direct current into an intermediate alternating current comprising M phases and supplied to M intermediate terminals; N&#xd7;M first electromagnetic coupling coils, each being connected to a respective intermediate terminal; N&#xd7;M magnetic cores, each first coil being wound around a respective core. This system comprises N&#xd7;M second electromagnetic coupling coils, each being connected to a respective first coil and wound around a distinct core from that of the respective first coil. The first and second coils of a same core correspond to a single phase, and generate respective common mode fluxes of opposite directions. Each output terminal is connected to the M second coils of a single phase.

System for converting at least one electrical input direct current into an electrical polyphase output alternating current

Growing community of inventors

Montrouge, France

Valentin Costan