Back to results
US 7,371,963 B2Granted
Photovoltaic power generation system
AssigneeKYOCERA Corporation
InventorsTakashi Suenaga, Taneo Higuchi
Life of this patent
Estimating the term…
Abstract
An object of the present invention is to provide a photovoltaic power generation system which is capable of achieving system linkage of a plurality of solar cell strings having different output voltages to a commercial electric power system with ease, and which enables efficient use of the maximum output electric power. It is a photovoltaic power generation system characterized by disposing voltage regulating means that regulates a DC voltage outputted from non-standard solar cell string between a standard solar cell string and electric power converting means, and regulating an output voltage of the non-standard solar cell string to the side of an output voltage of the standard solar cell string by the use of the voltage regulating means.
Claims27
A photovoltaic power generation system comprising:
- a first solar cell string composed of a plurality of solar cell elements or solar cell element groups connected in series;
- a second solar cell string composed of a plurality of solar cell elements or solar cell element groups connected in series, the second solar cell string being connected to the first solar cell string in parallel;
- electric power converting means for converting DC electric power outputted from these solar cell strings, to AC electric power and controlling so that a maximum output electric power is inputted;
- boosting means disposed between the second solar cell string and the electric power converting means, for carrying out boosting DC voltage outputted from the second solar cell string so that a maximum output electric power is inputted and so that the output voltage of the second solar cell string is equal to the output voltage of the first solar cell string and controlling the regulated output voltage so as not to be higher than the output voltage from the first solar cell string;
- and
- voltage regulating means disposed between the second solar cell string and the electric power converting means, for regulating a DC voltage outputted from the second solar cell string, and regulating an output voltage of the second solar cell string to be close to an output voltage of the first solar cell string,
- wherein, the voltage regulating means has a controlling section for controlling an operation so as to stop regulation of the DC voltage of the DC electric power supplied from the second solar cell string when the second solar cell string begins electric power generation earlier than the first solar cell string, and the electric power converting means is actuated by the first solar cell string.
4 more elements
A photovoltaic power generation system comprising:
- a first solar cell string composed of a plurality of solar cell elements or solar cell element groups connected in series;
- a second solar cell string composed of a plurality of solar cell elements or solar cell element groups connected in series, and connected to the first solar cell string in parallel, electric power generated by the second solar cell string being lower than that of the first solar cell string;
- electric power converting means for converting DC electric power outputted from these solar cell strings to AC electric power and controlling so that a maximum output electric power is inputted;
- and
- boosting means disposed between the second solar cell string and the electric power converting means, for carrying out boosting DC voltage outputted from the second solar cell string so that a maximum output electric power is inputted and so that the output voltage of the second solar cell string is equal to the output voltage of the first solar cell string and controlling the regulated output voltage so as not to be higher than the output voltage from the first solar cell string,
- wherein, the boosting means has a controlling section for controlling an operation so as to stop a boosting operation when the second solar cell string begins electric power generation earlier than the first solar cell string, and the electric power converting means is actuated by the first solar cell string.
3 more elements
A photovoltaic power generation system comprising:
- a first solar cell string composed of a plurality of solar cell elements connected to each other;
- a second solar cell string composed of a plurality of solar cell elements connected to each other, the second solar cell string being connected to the first solar cell string in parallel;
- electric power converting means for converting DC electric power outputted from the first and second solar cell strings and supplied thereto, at a conversion voltage Vm at which a maximum DC electric power is supplied, to AC electric power;
- and
- voltage regulating means interposed in a connection path which electrically connects the second solar cell string and the electric power converting means, for regulating a DC voltage of the DC electric power supplied from the second solar cell string so as to be close to a conversion voltage Vm,
- wherein the voltage regulating means has a controlling section for controlling an operation so as to stop regulation of the DC voltage of the DC electric power supplied from the second solar cell string when the second solar cell string begins electric power generation earlier than the first solar cell string.
3 more elements
A photovoltaic power generation system comprising:
- a first solar cell string composed of a plurality of solar cell elements connected to each other;
- a second solar cell string composed of a plurality of solar cell elements connected to each other, the second solar cell string being connected to the first solar cell string in parallel;
- electric power converting means for converting DC electric power outputted from the first and second solar cell strings and supplied thereto at a conversion voltage Vm at which a maximum DC electric power is supplied, to AC electric power;
- and
- voltage regulating means interposed in a connection path which electrically connects the second solar cell string and the electric power converting means, for regulating a DC voltage of the DC electric power supplied from the second solar cell string so that a maximum DC electric power is supplied from the second solar cell string,
- wherein the voltage regulating means has a controlling section for controlling an operation so as to stop regulation of the DC voltage of the DC electric power supplied from the second solar cell string when the second solar cell string begins electric power generation earlier than the first solar cell string.
3 more elements
Dependencies are inferred from the claim text.