Tracking type photovoltaic power generator and error correction method of its built-in clock

DETAILED DESCRIPTION Therefore, an object of the present invention is to provide a tracking type photovoltaic power generator that can automatically correct an error of a clock, and an error correction method of its built-in clock.
In order to attain the above-mentioned object, a tracking type photovoltaic power generator according to a first aspect of the present invention comprises a clock for clocking a time, a sun direction sensor and a controller.
The sun direction sensor outputs a signal indicative of a sun direction.
The controller corrects an error of the time clocked by the clock based on the signal from the sun direction sensor.
In the tracking type photovoltaic power generator according to the first aspect of the present invention, the controller may be composed of a calculating section, a detecting section and a correcting section.
The calculating section calculates a first time when the sun arrives at a predetermined azimuth based on the time clocked by the clock.
The detecting section detects the predetermined azimuth based on the signal from the sun direction sensor.
The correcting section corrects the error of the time clocked by the clock based on a difference between a second time when the detecting section detects the predetermined azimuth and the first time calculated by the calculating section.
In this case, the detecting section can be configured so as to detect the predetermined azimuth based on the signal from the sun direction sensor within a predetermined time period before or after the first time calculated by the calculating section.
Also, the correcting section can be configured so as to correct the error of the time clocked by the clock in a time band except the predetermined time period.
Moreover, the correcting section can be configured so as to correct the error of the time 6.
An error correction method of its built-in clock in the tracking type photovoltaic power generator according to a second aspect of the present invention includes the steps of: detecting an error of a time clocked by the built-in clock based on a signal from a sun direction sensor; and correcting the error of the time clocked by the built-in clock based on the detected error