Methods and apparatuses for tracking maximum power point of solar electricity generating system
First Claim
1. A method for tracking a maximum power point of a solar electricity generating system, wherein said system comprises a solar cell and a DC/AC converter electrically connected to said cell, comprising the steps of:
- (a) providing an initial value of an output current amplitude of said converter;
(b) sensing an initial value of an output voltage of said cell in response to said initial value of said output current amplitude;
(c) providing a reference output current amplitude of said converter and allowing said system being operated under said reference output current amplitude for a specific time period;
(d) sensing a output voltage of said cell in response to said reference output current amplitude;
(e) comparing said output voltage with said initial value of said output voltage to generate a variation of said output voltage;
(f) adjusting said reference output current amplitude in a direction of said variation and replacing said initial value of said output voltage by said reference output voltage; and
(g) repeating said steps (c) to (f).
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Abstract
A solar electricity generating system includes a solar cell and a DC/AC converter coupled to the cell. The first proposed method includes the steps of: (a) adjusting an output current of the DC/AC converter; (b) sensing an output voltage variation of the solar cell; (c) adjusting the output current in a direction of the variation; and (d) repeating the steps (a) to (c). The second proposed method includes the steps of: (a) adjusting a DC output voltage of the solar cell; (b) sensing an output current amplitude variation of the DC/AC converter; (c) adjusting the output voltage in a direction of the variation; and (d) repeating the steps (a) to (c).
153 Citations
26 Claims
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1. A method for tracking a maximum power point of a solar electricity generating system, wherein said system comprises a solar cell and a DC/AC converter electrically connected to said cell, comprising the steps of:
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(a) providing an initial value of an output current amplitude of said converter;
(b) sensing an initial value of an output voltage of said cell in response to said initial value of said output current amplitude;
(c) providing a reference output current amplitude of said converter and allowing said system being operated under said reference output current amplitude for a specific time period;
(d) sensing a output voltage of said cell in response to said reference output current amplitude;
(e) comparing said output voltage with said initial value of said output voltage to generate a variation of said output voltage;
(f) adjusting said reference output current amplitude in a direction of said variation and replacing said initial value of said output voltage by said reference output voltage; and
(g) repeating said steps (c) to (f).
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2. A method for tracking a maximum power point of a solar electricity generating system, wherein said system comprises a solar cell and a DC/AC converter electrically connected to said cell, comprising the steps of:
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(a) adjusting an output current of said converter;
(b) sensing an output voltage variation of said cell;
(c) adjusting said output current of said converter in a direction of said variation; and
(d) repeating said steps (a) to (c).
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3. An apparatus for tracking a maximum power point of a solar electricity generating system, wherein said system comprises a solar cell and a DC/AC converter electrically connected to said cell, and an output voltage and an output current are generated by said cell and said converter respectively, comprising:
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a digital processor electrically connected to said cell and said converter for receiving a feedback of said output voltage and a feedback of said output current, and generating a control signal in response to a variation of said output voltage; and
a driver electrically connected to said converter and said processor for generating a PWM signal in response to said control signal so as to adjust said output current amplitude in a direction of said variation of said output voltage. - View Dependent Claims (4, 5, 6)
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7. An apparatus for tracking a maximum power point of a solar electricity generating system, wherein said system comprises a solar cell, a DC/DC converter electrically connected to said solar cell, and a DC/AC converter electrically connected to said DC/DC converter, and a first output voltage, a second output voltage, and an output current are generated by said cell, said DC/DC converter, and said DC/AC converter respectively, comprising:
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a digital processor electrically connected to said cell, said DC/DC converter, and said DC/AC converter for receiving a feedback of said second output voltage and a feedback of said output current, and generating a control signal in response to a variation of said second output voltage; and
a driver electrically connected to the said processor and both the said DC/DC converter and said DC/AC converter for generating a PWM signals in response to said control signal so as to generate said second output voltage by said DC/DC converter and adjust an amplitude of said output current through said DC/AC converter in a direction of said variation of said second output voltage. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for tracking a maximum power point of a solar electricity generating system, wherein said system comprises a solar cell and a DC/AC converter electrically connected to said cell, comprising the steps of:
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(a) providing an initial value of a DC output voltage of said cell;
(b) sensing an initial value of an output current amplitude of said converter in response to said initial value of said output voltage;
(c) providing a reference output voltage of said cell and allowing said system being operated under said reference output voltage for a specific time period;
(d) sensing a reference output current amplitude of said converter in response to said reference output voltage;
(e) comparing said reference output current amplitude with said initial value of said output current amplitude to generate an amplitude variation of said output current;
(f) adjusting said reference output voltage in a direction of said amplitude variation and replacing said initial value of said output current amplitude by said reference output current amplitude; and
(g) repeating said steps (c) to (f).
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15. A method for tracking a maximum power point of a solar electricity generating system, wherein said system comprises a solar cell and a DC/AC converter electrically connected to said cell, comprising the steps of:
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(a) adjusting a DC output voltage of said cell;
(b) sensing an output current amplitude variation of said converter;
(c) adjusting said output voltage in a direction of said variation; and
(d) repeating said steps (a) to (c).
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16. An apparatus for tracking a maximum power point of a solar electricity generating system, wherein said system comprises a solar cell and a DC/AC converter electrically connected to said cell, and an output voltage and an output current are generated by said cell and said converter respectively, comprising:
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a digital processor electrically connected to said cell and said converter for receiving a feedback of said output voltage and a feedback of said output current, and generating a control signal in response to an output current amplitude variation; and
a driver electrically connected to said converter and said processor for generating a PWM signal in response to said control signal so as to adjust said output voltage in a direction of said variation. - View Dependent Claims (17, 18, 19)
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20. An apparatus for tracking a maximum power point of a solar electricity generating system, wherein said system comprises a solar cell, a DC/DC converter electrically connected to said solar cell, and a DC/AC converter electrically connected to said DC/DC converter, and a first output voltage, a second output voltage, and an output current are generated by said cell, said DC/DC converter, and said DC/AC converter respectively, comprising:
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a digital processor electrically connected to said cell, said DC/DC converter, and said DC/AC converter for receiving a feedback of said second output voltage and a feedback of said output current, and generating a control signal in response to an output current amplitude variation; and
a driver electrically connected to said processor and both said DC/DC converter and said DC/AC converter for generating a PWM signals in response to said control signal so as to generate said second output voltage by said DC/DC converter and adjust said first output voltage through said cell in a direction of said variation. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification