System and method for maintaining a photovoltaic power source at a maximum power point
First Claim
1. A method for setting an operating parameter for a load on a photovoltaic power source, the method comprising:
- operating a load, using a control system, with the operating parameter at a first value;
providing a measurement of DC source voltage at the power source to the control system;
providing a measurement of DC source current at the power source to the control system;
determining, at the control system, the logarithm of the conductance from the measurement of DC source voltage and the measurement of DC source current;
comparing a reference parameter based on the logarithm of the conductance to a reference setpoint; and
modifying the operating parameter for the load if the value of the reference parameter differs from the value of the reference setpoint by more than a threshold amount.
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Accused Products
Abstract
A method is provided for setting an operating parameter for a load on a photovoltaic power source, such as an AC signal or the speed of a motor, including operating a load, using a control system, with the operating parameter set at a first value, providing a measurement of DC source voltage at the power source to the control system, and providing a measurement of DC source current at the power source to the control system, determining the logarithm of the conductance from the measurement of DC source voltage and the measurement of DC source current, and comparing a reference parameter based on the logarithm of the conductance to a reference setpoint. Based on that comparison, the operating parameter may be modified for the load if the value of the reference parameter differs from the value of the reference setpoint by more than a threshold amount.
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Citations
20 Claims
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1. A method for setting an operating parameter for a load on a photovoltaic power source, the method comprising:
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operating a load, using a control system, with the operating parameter at a first value; providing a measurement of DC source voltage at the power source to the control system; providing a measurement of DC source current at the power source to the control system; determining, at the control system, the logarithm of the conductance from the measurement of DC source voltage and the measurement of DC source current; comparing a reference parameter based on the logarithm of the conductance to a reference setpoint; and modifying the operating parameter for the load if the value of the reference parameter differs from the value of the reference setpoint by more than a threshold amount. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computer based method for controlling a load on a photovoltaic power source, the method comprising:
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setting an operating parameter of the load at a first value; receiving, at a controller, a measurement of DC source voltage at the power source; receiving, at the controller, a measurement of DC source current at the power source; determining, at the controller, the logarithm of the conductance from the measurement of DC source voltage and the measurement of DC source current; comparing a reference parameter based on the logarithm of the conductance to a reference setpoint; and modifying the operating parameter for the load if the value of the reference parameter differs from the value of the reference setpoint. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A photovoltaic power system comprising:
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a photovoltaic power source; a load driven by the photovoltaic power source; a first sensor configured to monitor DC source voltage at the power source; a second sensor configured to monitor DC source current at the power source; and a controller for controlling the load, the controller configured to; operate the load at a first value of an operating parameter; receive, from the first sensor and the second sensor, measurements of DC source voltage and current at the power source; determine the logarithm of the conductance from the measurement of DC source voltage and the measurement of DC source current; compare a reference parameter based on the logarithm of the conductance to a reference setpoint; and modify the operating parameter for the load if the value of the reference parameter differs from the value of the reference setpoint. - View Dependent Claims (19, 20)
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Specification