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US 12,176,700 B2Granted
Photovoltaic rapid shutdown and arc sensing system
OwnerCedric Somers, Marc-André Forgetinventors
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Abstract
The present disclosure provides a system, apparatus and method for providing rapid shutdown for photovoltaic power systems and provides a system, apparatus and method for providing arc sensing for photovoltaic power systems. An AC current can be put on the DC bus to control PV panel shutdown. Local mean decomposition can be used to sense arcing on the DC bus.
Claims10
A method for arc detection in a photovoltaic system, the method comprising:
- collecting a raw signal by a sensor connected to a DC bus of said photovoltaic system;
- applying threshold Local Mean Decomposition (LMD) to extract a first set of peaks and valleys from said raw signal;
- finding a first set of envelopes using said first set of peaks and valleys;
- applying Windowed Local Mean Decomposition (LMD) to extract a second set of peaks and valleys;
- finding a second set of envelopes using said second set of peaks and valleys;
- comparing said first set of envelopes and said second set of envelopes;
- sending an output signal indicating arcing when said first set of envelopes and said second set of envelopes concurrently shows an arc in said system.
4 more elements
An arc-sensing circuit for use with a photovoltaic system comprising:
- a sensor connected to a DC bus of said photovoltaic system collecting raw signal from said DC bus;
- a control unit receiving said raw signal comprising:
- a processor;
- and
- a non-transitory computer-readable medium containing instructions that, when executed by the processor, causes the processor to perform:
- applying threshold Local Mean Decomposition (LMD) to extract a first set of peaks and valleys from said raw signal;
- finding a first set of envelopes using said first set of peaks and valleys;
- applying Windowed Local Mean Decomposition (LMD) to extract a second set of peaks and valleys;
- finding a second set of envelopes using said second set of peaks and valleys;
- comparing said first set of envelopes and said second set of envelopes;
- sending an output signal indicating arcing when said first set of envelopes and said second set of envelopes concurrently shown an arc in said system.
8 more elements
Dependencies are inferred from the claim text.