Patent ID: 9506971
Filing Date: 2016-11-29
CPC Classification: H02S,Y02E

Claim Text:
1. A failure diagnosis method for a photovoltaic power generation system, the method comprising: detecting, by a detection unit, a working voltage and a working current of a solar battery array, formed by connecting in parallel a plurality of solar battery strings, each solar battery string formed by serially connecting a plurality of solar battery modules, each formed by serially connecting a plurality of solar battery cells and connecting a protective diode to both ends, as one unit; calculating, by a failure information calculation unit, failure information of the solar battery array using the detected working voltage and the working current; calculating, by the failure information calculation unit, a solar radiation intensity of radiation on the solar battery array using a predetermined coefficient, wherein the predetermined coefficient is a ratio between the working current and a short-circuit current of the solar battery array; calculating, by the failure information calculation unit, a working temperature of the solar battery array using the working voltage and the solar radiation intensity; updating, by the failure information calculation unit, the predetermined coefficient using the calculated working temperature and the failure information; and identifying, by the failure information calculation unit, failure in the solar battery array.