The quality check method of measured data in photovoltaic systems

摘要

When a PV system is evaluated, the measurement of irradiation is one of important parameters, which specifies the input energy to the system. Its data quality directly affects the accuracy of measured efficiencies and wrong data may give the one exceeding 100%. Doubtful data can be so frequently seen in a number of monitored PV systems supposedly due to shading on a pyranometer, soiled surface of its glass dome or the degradation of its sensitivity. The authors has developed a new approaches to improve those doubtful irradiation data remarkably by identifying the shading effects and sensitivity changes according to the reference data estimated by the sunshine hours which is delivered from AMeDAS, the Automated Meteorological Data Acquisition System.