Photovoltaic system and method for operating a photovoltaic system
First Claim
1. A method for operating a photovoltaic system having a DC motor electrically connected to a plurality of photovoltaic modules and an AC generator driven by the DC motor and electrically connected to a power mains, the method comprising the steps of:
- repeatedly measuring electric power supplied by the plurality of photovoltaic modules to the DC motor; and
changing an excitation field of the DC motor to adjust the supplied electric power to a peak power which the plurality of photovoltaic modules is capable of delivering at a current ambient temperature and a current incident solar radiation intensity.
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Accused Products
Abstract
A photovoltaic system includes a plurality of photovoltaic modules and a DC motor connected to a three-phase generator driven by a shaft. The three-phase generator is connected to a power mains. The electric power supplied to the DC motor by the plurality of photovoltaic modules is repeatedly measured and adjusted, by changing an external excitation current of the DC motor, to the peak power attainable at the current ambient temperature and the current incident solar radiation intensity. The peak power is preferably determined by incrementally changing the excitation current in predetermined time intervals, until the supplied electric power produces a power level which can be regarded as the peak power.
29 Citations
23 Claims
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1. A method for operating a photovoltaic system having a DC motor electrically connected to a plurality of photovoltaic modules and an AC generator driven by the DC motor and electrically connected to a power mains, the method comprising the steps of:
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repeatedly measuring electric power supplied by the plurality of photovoltaic modules to the DC motor; and changing an excitation field of the DC motor to adjust the supplied electric power to a peak power which the plurality of photovoltaic modules is capable of delivering at a current ambient temperature and a current incident solar radiation intensity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A photovoltaic system comprising:
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a plurality of photovoltaic modules; a DC motor having an input electrically connected to the photovoltaic modules and receiving from the photovoltaic modules a DC voltage and a DC current; an AC generator driven by the DC motor via a shaft and producing an AC output voltage capable of being supplied to a power mains; a first control unit having two inputs and an output, wherein the first input receives the DC voltage from the DC motor; and a computing unit having a first input receiving the DC voltage from the DC motor and an output producing an output signal, which is iteratively computed and adjusted by the computing unit in accordance with a maximum permissible peak power for a current incident solar radiation intensity and a current ambient temperature and supplied to the second input of the first control unit, wherein in response to the signals received at the first and second input, the first control unit produces at the output an output signal which causes an excitation field of the DC motor to change, so that the DC motor generates the maximum permissible peak power. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification