Arc detection and prevention in a power generation system
First Claim
1. A method comprising:
- drawing, by a power device, input power from a photovoltaic generator, wherein the input power is at a first voltage level and a first current level;
providing output power at an output of the power device;
reducing, without shorting outputs of the photovoltaic generator, a voltage and a current of the input power to a level that extinguishes an arc while maintaining at least some of the output power;
waiting a predetermined time period; and
responsive to the predetermined time period elapsing, increasing the voltage of the input power.
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Accused Products
Abstract
Methods for arc detection in a system including one or more photovoltaic generators, one or more photovoltaic power devices and a system power device and/or a load connectible to the photovoltaic generators and/or the photovoltaic power devices. The methods may measure voltage, current, and/or power delivered to the load or system power device, and the methods may measure voltage noise or current noise within the photovoltaic system. The methods may periodically, and/or in response to detecting noise, reduce an electrical parameter such as current or voltage in order to extinguish an arc. The methods may compare one or more measurements to one or more thresholds to detect arcing, and upon a comparison indicating that arcing is or was present, an alarm condition may be set.
1262 Citations
20 Claims
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1. A method comprising:
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drawing, by a power device, input power from a photovoltaic generator, wherein the input power is at a first voltage level and a first current level; providing output power at an output of the power device; reducing, without shorting outputs of the photovoltaic generator, a voltage and a current of the input power to a level that extinguishes an arc while maintaining at least some of the output power; waiting a predetermined time period; and responsive to the predetermined time period elapsing, increasing the voltage of the input power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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measuring electrical noise in an electrical system to obtain a first measurement, wherein the electrical system is operational to send an output power to a load; comparing the first measurement to a first threshold; responsive to determining that the first measurement is above the first threshold, reducing without shorting outputs of the electrical system, a voltage and a current of the electrical system while maintaining at least some of the output power; after the reducing of the voltage and the current, measuring electrical noise in the electrical system to obtain a second measurement; and determining, based on the second measurement, whether to set an alarm condition. - View Dependent Claims (11, 12, 13)
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14. A power device comprising:
one or more controllers configured to cause the power device to; draw input power from a photovoltaic generator, wherein the input power is at a first voltage level and a first current level; provide output power at an output of the power device; reduce, without shorting outputs of the photovoltaic generator, a voltage and a current of the input power to a level that extinguishes an arc while maintaining at least some of the output power; wait a predetermined time period; and responsive to the predetermined time period elapsing, increase the voltage of the input power. - View Dependent Claims (15, 16, 17, 18, 19, 20)
Specification