Method and system for providing local converters to provide maximum power point tracking in an energy generating system
First Claim
1. A method for providing maximum power point tracking for an energy generating device using a local buck-boost converter coupled to the energy generating device, the method comprising operating in a tracking mode, operating in the tracking mode comprising:
- initializing a conversion ratio for the buck-boost converter based on a previous optimum conversion ratio;
calculating a device power associated with the initialized conversion ratio;
repeatedly modifying the conversion ratio and calculating a device power associated with each of the modified conversion ratios; and
identifying a current optimum conversion ratio for the buck-boost converter based on the calculated device powers, the current optimum conversion ratio corresponding to one of a buck mode, a boost mode and a buck-boost mode for the buck-boost converter.
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Abstract
A method for providing maximum power point tracking for an energy generating device using a local buck-boost converter coupled to the device is provided. The method includes operating in a tracking mode, which includes initializing a conversion ratio for the buck-boost converter based on a previous optimum conversion ratio. A device power associated with the initialized conversion ratio is calculated. The conversion ratio is repeatedly modified and a device power associated with each of the modified conversion ratios is calculated. A current optimum conversion ratio for the buck-boost converter is identified based on the calculated device powers. The current optimum conversion ratio corresponds to one of a buck mode, a boost mode and a buck-boost mode for the buck-boost converter.
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Citations
23 Claims
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1. A method for providing maximum power point tracking for an energy generating device using a local buck-boost converter coupled to the energy generating device, the method comprising operating in a tracking mode, operating in the tracking mode comprising:
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initializing a conversion ratio for the buck-boost converter based on a previous optimum conversion ratio; calculating a device power associated with the initialized conversion ratio; repeatedly modifying the conversion ratio and calculating a device power associated with each of the modified conversion ratios; and identifying a current optimum conversion ratio for the buck-boost converter based on the calculated device powers, the current optimum conversion ratio corresponding to one of a buck mode, a boost mode and a buck-boost mode for the buck-boost converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for providing maximum power point tracking (MPPT) for each of a plurality of energy generating devices in an energy generating array, comprising, for each energy generating device:
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a power stage capable of receiving a device voltage and a device current from the energy generating device and generating an output voltage and an output current based on the device voltage and the device current; and a local converter coupled to the power stage, the local converter comprising; an MPPT module capable of operating in a tracking mode by (i) initializing a conversion ratio for the power stage based on a previous optimum conversion ratio, (ii) calculating a device power associated with the initialized conversion ratio, (iii) repeatedly modifying the conversion ratio and calculating a device power associated with each of the modified conversion ratios, and (iv) identifying a current optimum conversion ratio for the power stage based on the calculated device powers, and a communication interface coupled to the MPPT module and capable of providing the device voltage, device current, output voltage and output current to a central array controller for the array. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A system for providing maximum power point tracking (MPPT) for each of a plurality of energy generating devices in an energy generating array, comprising, for each energy generating device:
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a single-inductor, four-switch synchronous buck-boost switching regulator capable of receiving a device voltage and a device current from the energy generating device and generating an output voltage and an output current based on the device voltage and the device current; and an MPPT module coupled to the switching regulator and capable of receiving the device voltage and the device current, the MPPT module comprising; an MPPT control block capable of generating a conversion ratio based on the device voltage and the device current, and a power stage regulator coupled to the MPPT control block and capable of selecting a mode for the switching regulator based on the conversion ratio and operating the switching regulator in the selected mode. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification