Abstract:System efficiency(PR)index is a frequentlyused evaluation parameter for power station, while calculation of PR of photovoltaic power station at present is calculated as per stipulation of IEC 61724—1998 Guide Rule for Performance Monitoring, Measurement, Data Exchange and Analysis of Photovoltaic System, and influence of temperature of unit battery piece is not considered, therefore difference will be caused between calculation value and actual value in winter and summer. The study added temperature correction factor on basis of traditional PR formula, compared result of different temperature correction method, obtained relatively accurate result of Sunpower temperature correction method, and conducted investigation to calculation method of temperature of different battery pieces.

Keywords:photovoltaic power station, system efficiency, temperature correction, battery piece