Systems and methods for DC power line communication in a photovoltaic system
First Claim
1. A method for direct current (DC) power line communication in a photovoltaic system, comprising:
- transferring power between a photovoltaic device and a load using a power line;
receiving information to be communicated;
in response to receiving the information to be communicated, changing operation of the power line to cause the power line to operate outside of a predetermined normal operating range of the power line, to encode the information to be communicated;
detecting a change in operation of the power line; and
in response to detecting the change in operation of the power line, decoding operating state of the power line to obtain the information to be communicated,the step of detecting the change in operation of the power line comprising at least one of (a) detecting magnitude of a DC component of a voltage on the power line dropping below a first threshold value and (b) detecting magnitude of a DC component of a current flowing through the power line rising above a second threshold value.
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Abstract
A method for direct current power line communication in a photovoltaic system includes (a) transferring power between a photovoltaic device and a load using a power line, (b) detecting a change in operation of the power line, and (c) in response to the detected change in operation of the power line, decoding operating state of the power line to obtain information. A method for direct current power line communication in a photovoltaic system includes (a) transferring power between a photovoltaic device and a load using a power line, (b) changing operation of the power line, and (c) encoding operating state of the power line to represent information to be communicated.
31 Citations
23 Claims
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1. A method for direct current (DC) power line communication in a photovoltaic system, comprising:
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transferring power between a photovoltaic device and a load using a power line; receiving information to be communicated; in response to receiving the information to be communicated, changing operation of the power line to cause the power line to operate outside of a predetermined normal operating range of the power line, to encode the information to be communicated; detecting a change in operation of the power line; and in response to detecting the change in operation of the power line, decoding operating state of the power line to obtain the information to be communicated, the step of detecting the change in operation of the power line comprising at least one of (a) detecting magnitude of a DC component of a voltage on the power line dropping below a first threshold value and (b) detecting magnitude of a DC component of a current flowing through the power line rising above a second threshold value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for direct current (DC) power line communication in a photovoltaic system, comprising:
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transferring power between a photovoltaic device and a load using a power line; receiving information to be communicated; in response to receiving the information to be communicated, changing operation of the power line to cause the power line to operate outside of a predetermined normal operating range of the power line, to encode the information to be communicated; detecting a change in operation of the power line; and in response to detecting the change in operation of the power line, decoding operating state of the power line to obtain the information to be communicated, the step of detecting the change in operation of the power line comprising at least one of (a) detecting magnitude of a DC component of a voltage on the power line rising above a first threshold value and (b) detecting magnitude of a DC component of a current flowing through the power line falling below a second threshold value. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for direct current (DC) power line communication in a photovoltaic system, comprising:
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transferring power between a photovoltaic device and a load using a power line; receiving information to be communicated; in response to receiving the information to be communicated, changing operation of the power line by performing at least one of (a) changing magnitude of a DC component of a voltage on the power line and (b) changing magnitude of a DC component of a current flowing through the power line, to cause the power line to operate outside of a predetermined normal operating range of the power line and to encode the information to be communicated, the predetermined normal operating range of the power line including at least one of a predetermined voltage magnitude range of the power line, a predetermined current magnitude range of the power line, a predetermined power magnitude range of the power line, and a predetermined polarity of current flowing through the power line; detecting a change in operation of the power line; and in response to detecting the change in operation of the power line, decoding operating state of the power line to obtain the information to be communicated. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification