Method and device for detecting a photovoltaic electricity production apparatus in an electrical distribution network, and associated computer program product

Patent metadata

Field	Value
Publication number	US-9557357-B2
Application number	US-201514950157-A
Country	US
Kind code	B2
Filing date	Nov 24, 2015
Priority date	Dec 8, 2014
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A method detects at least one photovoltaic electricity production apparatus in an electrical distribution network including at least one electrical installation and at least one current sensor, each installation further including at least one electrical apparatus. The method includes acquisition, by a current sensor, of a plurality of active power profiles of a corresponding installation, computation, for at least one pair of active power profiles of a differential profile equal to the difference between the power profiles of the pair, computation of a coefficient of correlation between the differential profile or profiles computed and a reference profile, and detection of the presence of a photovoltaic electricity production apparatus among the electrical apparatus or apparatuses of the installation.

First claim

The invention claimed is:

1. A method for detecting at least one photovoltaic electricity production apparatus in an electrical distribution network comprising at least one electrical installation and at least one current sensor, each installation comprising at least one electrical apparatus and being connected to a respective distribution node by at least one respective electrical conductor, each sensor being associated with a respective electrical conductor,
the method comprising the following steps:
i/ acquisition, by a current sensor, of a plurality of active power profiles of a corresponding installation, each active power profile comprising a plurality of active power measurements each associated with a respective time instant of a time range;
ii/ computation, for at least one pair of active power profiles, of a differential profile comprising a plurality of values, each value of the differential profile being equal to the difference between two respective measurements of the active power profiles of said pair;
iii/ computation of a coefficient of correlation between the differential profile or profiles computed and a reference profile corresponding to a photovoltaic electricity production;
iv/ detection of the presence of a photovoltaic electricity production apparatus among the electrical apparatus or apparatuses of the installation considered when the coefficient of correlation is greater than a predefined value.

2. The method according to claim 1 , in which the respective time ranges of the active power profiles of each pair have substantially equal durations.

3. The method according to claim 1 , in which step ii/ comprises selection, from among the plurality of acquired profiles, of a pair of profiles for which the consumption of electrical energy by the installation considered is substantially equal, from one profile of the pair to the other, during the measurement time range of each of the two profiles of said pair, and the computation of the differential profile is performed from the selected pair of profiles.

4. The method according to claim 3 , in which step i/ further comprises acquisition of a plurality of reactive power profiles, each reactive power profile comprising a plurality of reactive power measurements each associated with a respective time instant of the time range of a corresponding active power profile, and computation from each reactive power profile of the reactive energy consumed during the corresponding time range, and
in which the selection of the pair of profiles performed during step ii/comprises the selection of a pair of profiles for which the total consumption of reactive energy corresponding to one of the profiles of the pair is equal, within 10%, to the total consumption of reactive energy corresponding to the other profile of the pair.

5. The method according to claim 3 , in which the time range corresponding to each active power profile comprises a daytime period and a night-time period, and
in which the selection of the pair of profiles performed during step ii/comprises the selection of a pair of profiles for which the total consumption of active energy during the night-time period corresponding to one of the profiles of the pair is equal, within 10%, to the total consumption of active energy during the night-time period corresponding to the other one of the profiles of the pair.

6. The method according to claim 1 , in which step if further comprises the acquisition of an insolation value during the measurement of each active power profile, and
step ii/ comprises selection, from among the plurality of acquired active power profiles, of at least one pair of profiles for which the acquired insolation value differs from one profile to the other, and the computation of the differential profile is performed from the selected pair of profiles.

7. The method according to claim 1 , in which step ii/ comprises the computation of a differential profile for each pair of active power profiles, and selection of at least one differential profile whereof the maximum absolute value is greater than half the maximum of the set of absolute values of the computed differential profiles, and
during step iii/, the computation of the coefficient of correlation is performed according to the differential profile or profiles selected.

8. The method according to claim 1 , in which step ii/ comprises the computation of at least one differential profile for each pair of active power profiles, and selection of a differential profile whereof the absolute value has a maximum value for a time instant between two predefined time instants, and
during step iii/, the computation of the coefficient of correlation is performed according to the differential profile or profiles selected.

9. The method according to claim 1 , in which, when multiple differential profiles are computed during step ii/, step iii/ further comprises the computation of an average differential profile equal to an average of the computed differential profiles, and the coefficient of correlation is computed between the average differential profile and the reference profile corresponding to the photovoltaic electricity production.

10. The method according to claim 1 , in which during step i/, each active power profile comprises frequential components, and the frequential components of each active power profile of at least one pair are filtered by a low-pass filter having a cutoff frequency substantially equal to 3.10 −4 Hz, and the computation of the differential profile is performed from the filtered pair of profiles.

11. The method according to claim 1 , further comprising a step of estimating the peak power of a photovoltaic electricity production apparatus detected from the computed differential profile.

12. The method according to claim 1 , in which steps i/ to iv/ are repeated from active power profiles acquired by another current sensor.

13. A computer program product comprising a non-transitory, computer-readable medium storing software instructions that, when they are executed by a computer, implement a method according to claim 1 .

14. A device for detecting at least one photovoltaic electricity production apparatus in an electrical distribution network comprising at least one electrical installation and at least one current sensor, each installation comprising at least one electrical apparatus and being connected to a respective distribution node by at least one respective electrical conductor, each sensor being associated with a respective electrical conductor, the detection device comprising:
an acquisition module configured for acquiring, by a current sensor, a plurality of active power profiles of a corresponding installation, each active power profile comprising a plurality of active power measurements each associated with a respective time instant of a time range;
a differential module configured for computing, for at least one pair of active power profiles, a differential profile comprising a plurality of values, each value of the differential profile being equal to the difference between two respective measurements of the active power profiles of said pair;
a correlation module configured for computing a coefficient of correlation between the differential profile or profiles computed and a reference profile corresponding to a photovoltaic electricity production; and
a detection module configured for detecting the presence of a photovoltaic electricity production apparatus among the electrical apparatus or apparatuses of the installation considered when the coefficient of correlation is greater than a predefined value.

Assignees

• Schneider Electric Ind Sas

Inventors

• Bediou Stephane
• Clot Sylvain
• Clemence Michel
• Deschamps Philippe

Classifications

• H02J3/381

  Dispersed generators · CPC title

• H02J2101/24

  Photovoltaics · CPC title

• H02J13/12

  Monitoring network conditions, e.g. electrical magnitudes or operational status · CPC title

• H02J13/333 Primary

  the equipment forming part of substations · CPC title

• Y04S10/30

  State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge · CPC title