Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Renault S.a.s.

Safran Electrical & Power

Centre National De La Recherche Scientifique

Université Grenoble Alpes

Institut Polytechnique De Grenoble

Vincent Heiries

Ghislain Despesse

Sylvain Leirens

Pierre Perichon

Diego Alberto

Ibrahima Djigo

Antonio De Domenico

Mikael Carmona

Mikaël Carmona

Remy Thomas

Emmanuel Bussy

Marco Ranieri

Raphaël Toufflet

Jérôme Genoulaz

Jean-Louis Lacoume

Mouhcine Mendil

Paul-Henri Michel

Christophe Trebosc

Olivier Michel

The present disclosure relates to a method for detecting an electric arc in an electrical system (), comprising the following steps: a) acquiring a signal () coming from at least one sensor () detecting acoustic waves in the system (); b) calculating, using an electronic processing device (), a first value representative of the error between the signal and a first projection of the signal in a first representation space defined by a first dictionary matrix; b) calculating, using the electronic processing device (), a second value representative of the error between the signal and a second projection of the signal in a second representation space defined by a second dictionary matrix; and d) determining, from the first and second values, whether an electric arc has been produced in the system.

Method and device for detecting an electric arc in an electrical system

The invention concerns a method and a system for detecting an electric arc in an electrical installation () equipped with at least one sensor () capable of detecting temporal acoustic signals produced by the electrical installation (), said method being characterised in that it comprises a device for analysis () configured to analyse any temporal acoustic signal () coming from said one or more sensors () by associating with said acoustic signal a corresponding parsimony measurement (m) whose value indicates whether the acoustic signal is an electrical arc signature or not.

System and method for detecting an electric arc

A method for detecting and locating a fault affecting an electrical cable includes the steps of (a) placing a first sensor and a second sensor along the cable, the second sensor being an acoustic sensor; (b) detecting the occurrence of the fault with the first sensor at a first time, and with the second sensor at a second time; (c) taking into account a propagation speed of an acoustic wave generated by the fault; (d) estimating a position of the fault depending on the first time and on the second time, on the basis of the propagation speed resulting from step (c); (e) determining a reference propagation speed depending on the position resulting from step (d) of the fault, and comparing said reference propagation speed with the propagation speed taken into account in step (c); and, (f) depending on the comparison, validating the position resulting from step (d) or reiterating steps (c) to (f) while adjusting, in step (c), the propagation speed taken into account.

Method for detecting a fault occurring in a cable

Estimating cell capacitance includes learning a function that returns capacitance as a function of an earlier capacitance and a physical characteristic that is correlated with changes in that capacitance and using a supervised learning algorithm on a learning database that has values of the capacitance, values of that physical characteristic measured concurrently with the capacitance and a preceding value of the capacitance.

Automatic method for estimating the capacitance of a cell of a battery

A method of detecting an electric arc in an electrical system from a signal originating from at least one sensor detecting acoustic waves in the system, including: a) calculating by means of a processing device, over a sliding window of signal samples, at least one statistical parameter selected from the skewness and the kurtosis of the signal; b) detecting a possible occurrence of an event by taking into account said at least one statistical parameter; and c) performing a frequency analysis of the signal enabling to identify an electric arc when an event is detected at step b).

Method of detecting an electric arc by analysis of its acoustic signature

A method for estimating state-of-charge of a battery cell includes suppressing full execution of a capacitance-estimation algorithm for as long as a parameter does not exceed a certain threshold. The parameter is either a measured voltage value across the cell's terminals, the cell's estimated state-of-charge, or an amount of charge passing in or out of the cell during some interval. A battery-management system triggers full execution when the parameter falls below the threshold, or, if the parameter is the amount of charge passing, when it rises above the threshold.

Automatic method for estimating the state of charge of a cell of a battery

The radio access system () for the communication network includes a radio transceiver (), a device for connecting to an electrical grid (), an electrical energy production device () and a battery () for storing electrical energy produced by said production device () and for electrically powering the radio transceiver (). According to the invention, a control device () determines an operating strategy for the battery () by optimizing an objective function (O) that associates a cost with a possible operating strategy for the battery () during a period of determined duration T and while respecting at least one constraint for protecting the battery () against accelerated ageing, and manages the incoming and outgoing flows of electrical energy of the battery () depending on the determined operating strategy.

Process for controlling electrical energy fluxes in a system for radio access to a communication network, and associated control device

An estimation method for estimating a cell's state-of-charge includes obtaining a capacitance prediction for a cell based at least in part on a preceding capacitance thereof and correcting that prediction by acquiring measurements of a physical quantity that depends on a summation of currents passing through the cell. The correction is based at least in part on a difference between the measurement of the physical quantity and a prediction for that quantity.

Automatic method for estimating the cell's state-of-charge of a battery

Automatically determining state-of-charge of a battery with cells includes, for each cell, scheduling refreshment times for the cell as a function of the cell's priority level, at times that correspond to refreshment times for the first cell, fully executing an estimation algorithm for the first cell, for at least a second cell of the set of cells, and at times other than those that correspond to refreshment times for the second cell, partially executing the estimation algorithm for the cell thereby obtaining an estimate of the second cell's state-of-charge, and determining a state-of-charge of the battery from states-of-charge estimated for each of the cells of the battery. The estimation algorithm estimates a cell's state-of-charge at a particular time as a function of a measured voltage and a measured current, both of which are obtained at the particular time. As a result of having scheduled refreshment times for each cell based on priority levels for the cell, a first cell from the plurality of cells has its state-of-charge estimate refreshed more frequently than a second cell from the plurality of cells when the first cell has a higher priority than the second cell.

Automatic method for determining the state-of-charge of a battery

An automatic estimation procedure for estimating a battery's state-of-charge includes predicting the state-of-charge using a state model that includes a state-transition matrix. An observation model then uses an observability matrix in connection with predicting a measured value of a parameter. State noise, the covariance of which is characterized by a state-noise covariance matrix contaminates this prediction. Similarly, measurement noise, the covariance of which is characterized by a measurement covariance matrix, contaminates this prediction. The values of these covariance matrices are then adjusted during the estimation procedure.

Automatic method for estimating the state of charge of a battery cell

The invention relates to an electrical system comprising a plurality of modules that can be powered independently withy current, characterized in that it further comprises: The invention also relates to a method for locating faults in such an electrical system.

Method and system for protecting against electrical arcs implementing a modulation specific to a module of the acoustic wave accompanying an electrical arc

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Saint-Jean-de-Moirans, France

Vincent Heiries