Tracking type photovoltaic power generator and error correction method of its built-in clock
First Claim
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1. A tracking photovoltaic power generator comprising:
- a clock which clocks a time;
a sun direction sensor which outputs a signal indicative of a sun direction; and
a controller which detects an error of a time clocked by the clock based on a signal from the sun direction sensor and corrects the error of the time clocked by said clock based on the signal from said sun direction sensor.
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Abstract
A tracking type photovoltaic power generator includes a clock for clocking a time and a sun direction sensor for outputting a signal indicative of a sun direction, a controller which calculates a first time when the sun the sun arrives at a culmination azimuth on the basis of the time clocked by the clock, detects a culmination azimuth on the basis of a difference between a second time when the culmination azimuth is detected and the first time. Accordingly, the generator automatically corrects the error of the time clocked by the clock.
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Citations
14 Claims
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1. A tracking photovoltaic power generator comprising:
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a clock which clocks a time;
a sun direction sensor which outputs a signal indicative of a sun direction; and
a controller which detects an error of a time clocked by the clock based on a signal from the sun direction sensor and corrects the error of the time clocked by said clock based on the signal from said sun direction sensor. - View Dependent Claims (2)
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3. A tracking photovoltaic power generator comprising:
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a clock which clocks a time;
a sun direction sensor which outputs a signal indicative of a sun direction; and
a controller which detects an error of a time clocked by the clock base on a signal from the sun direction sensor and corrects the error of the time clocked by said clock based on the signal from said sun direction sensor;
wherein said controller includes;
a calculating section which calculates a first time when the sun arrives at an azimuth based on the time clocked by said clock;
a detecting section which detects said azimuth based on the signal from said sun direction sensor; and
a correction section which corrects the error of the time clocked by said clock based on a difference between a second time when said detecting section detects said azimuth and the first time calculated by said calculating section. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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10. An error correction method of a built-in clock in a tracking photovoltaic power generator comprising:
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detecting an error of a time clocked by said built-in clock based on a signal from a sun direction sensor; and
correcting the error of the time clocked by said built-in clock based on the detected error. - View Dependent Claims (11, 12, 13, 14)
calculating a first time when the sun arrives at an azimuth based on the time clocked by said built-in clock, detecting said azimuth based on the signal from said sun direction sensor; and
detecting the error of the time clocked by said built-in clock based on a difference between a second time when said azimuth is detected and said calculated first time.
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13. The error correction method of the built-in clock in a tracking photovoltaic power generator according to claim 12, wherein said azimuth is a culmination aznimuth of the sun relative to a location of the generator.
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14. The error correction method of the built-in clock in a tracing photovoltaic power generator according to claim 12, wherein said correcting step corrects the error of the time clocked by said built-in clock when said difference becomes equal to or greater than a given value.
Specification