Systems and methods for determining arc events using wavelet decomposition and support vector machines

Patent metadata

Field	Value
Publication number	US-10790779-B2
Application number	US-201816000694-A
Country	US
Kind code	B2
Filing date	Jun 5, 2018
Priority date	Jun 5, 2017
Publication date	Sep 29, 2020
Grant date	Sep 29, 2020

Abstract

In some examples, a system comprises a first component; a second component configured to receive signals from the first component via one or more wires; and a controller. In at least some examples, the controller is coupled to the one or more wires and is trained with a classification model to distinguish between signals indicating arc events and signals not indicating arc events. In at least some example, the controller is further configured to: receive the signals; extract features that are at least partially related to the received signals; classify the extracted features using the classification model; determine an occurrence of the arc event based on the classification; and provide an output signal indicating an arc event.

First claim

What is claimed is:

1. A system for detecting arc events, the system comprising:
an arc fault detector configured to receive signals from a photovoltaic (PV) module via one or more wires; and
wherein the arc fault detector comprises a controller coupled to the one or more wires and trained with a classification model to distinguish between signals indicating arc events from the PV module and signals not indicating arc events from the PV module, the controller further configured to:
receive the signals;
extract a plurality of features from the received signals, wherein the plurality of extracted features include a current and a voltage;
classify the extracted features using the classification model;
determine an occurrence of the arc event based on the classification; and
provide an output signal indicating an arc event;

wherein the classification system is based on a separating hyperplane is according to the following equation:
ω T x+b =0,

wherein ω is an n-dimensional vector and b is the intercept term, and wherein ω and b determine the position of the separating hyperplane, and wherein a functional margin of the hyperplane is according to the following equation;
y i (ω T x i +b )≥1,

wherein y i are labels for the classification system, and wherein x i are n-dimensional inputs, wherein an optimum hyperplane can be found according to the following equation;

min

ω
,
b

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2

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ω
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+

C
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i
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,

wherein C is an error penalty, and wherein ξ i is a slack variable, and wherein a Lagrangian is according to the following equation;

1
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ω

+

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∑

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wherein α i and r i are Lagrange multipliers, and wherein a final weight equation to solve for the separating hyperplane is according to the following equation;

∑

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.

Assignees

• Texas A & M Univ Sys

Inventors

• Balog Jr Robert S
• Wang Zhan

Classifications

• H10F77/955 Primary

  for photovoltaic devices · CPC title

• H02H7/20

  for electronic equipment (for converters H02H7/10; for electric measuring instruments G01R1/36; for DC voltage or current semiconductor regulators G05F1/569; for amplifiers H03F1/52; for electronic switching circuits H03K17/08) · CPC title

• Y02E10/50

  Photovoltaic [PV] energy · CPC title

• H02S50/00

  Monitoring or testing of PV systems, e.g. load balancing or fault identification · CPC title

• H02S40/30 Primary

  Electrical components · CPC title