US 8,476,870 B2Granted

Method of diagnosing defective elements in a standalone system, powered by an intermittent power source

AssigneeCommissariat a l'Energie Atomique

InventorsAntoine Labrunie, Sylvie Genies

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Abstract

The diagnostic method applies to a standalone system including a generator, a power regulator and a power storage element. The method includes comparison of the effective charging power or current of the power storage element respectively with a predefined power or current threshold. If the effective charging power or current is lower than said threshold, the power storage element is disconnected. An abnormal behavior is then detected either by comparing the effective charging power with the smaller of the values representative of the theoretical charging power of the power storage element and of the maximum power able to be delivered by the generator and comparing the effective and theoretical charging voltages, or by comparing the effective and theoretical charging currents.

Claims9

Dependent claims

A method for diagnosing defective elements in a standalone system comprising

providing the standalone system having:
an intermittent power source providing a first voltage and a first current,
a power regulator electrically coupled to the intermittent power source,
a power storage element charged by the power regulator with an effective charging current and an effective charging voltage,
measuring the effective charging current and the effective charging voltage,
determining an effective charging power according to said measurements of the effective charging current and the effective charging voltage,
comparing the effective charging power with a predefined power threshold,
disconnecting the power storage element if the effective charging power is lower than the power threshold,
measuring a maximum instantaneous deliverable power by the intermittent power source while the power storage element is disconnected,
determining a state of charge of the disconnected power storage element,
determining a theoretical charging voltage of the power storage element, the theoretical charging voltage being a function of the measured state of charge,
determining a theoretical charging power of the power storage element, the theoretical charging power being a function of the measured state of charge,
comparing the effective charging power of the storage element with the smaller of the theoretical charging power of the storage element and of the maximum power deliverable by the generator, and according to the comparing the effective charging voltage with the theoretical charging voltage of the power storage element so as to determine a normal behavior of the standalone system, a malfunctioning behavior of the generator and a malfunctioning behavior of the power storage element.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/450,956Filed 7 May 2008
Priority: FR 07 0336911 May 2007
Published: US 2010/0085063 A18 Apr 2010
Granted: 2 Jul 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H02J 7/60
Circuit arrangements for charging or discharging batteries or for supplying loads from batteries: including safety or protection arrangements
G01R 31/382
Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of…
H02J 7/35
Parallel operation in networks using both storage and other DC sources, e.g. providing buffering: with light sensitive cells
H02S 50/10
Monitoring or testing of PV systems, e.g. load balancing or fault identification: testing of PV devices, e.g. of PV modules or single PV cells