Estimation method on power generation performance of grid-connected photovoltaic system And Apparatus Thereof

摘要

The present invention relates to a method and apparatus for estimating power generation performance of a grid-connected photovoltaic power generation system, the method comprising calculating and converting DC power, AC power, and solar intensity values of the photovoltaic power generation system into equivalent operating time, and photovoltaic power generation. Estimating an equivalent operating time (Y _{AT, Esti} ) after temperature correction of the array, and based on the estimated operating time (Y _{AT, Esti} ) and the surface temperature (T _m ) of the photovoltaic module after the estimated temperature correction. solar equivalent operation of the power array time (Y _{a, Esti)} the equivalent running time of the photovoltaic power system from the estimated phase, and the estimated solar power equivalent running time of the array (Y _{a, Esti)} to (Y _{P, Estim} ) and _{comparing the difference} between the estimated operating time (Y _{A, Esti} ) of the photovoltaic array and the equivalent operating time (Y _{P, Esti} ) of the photovoltaic system and the actual output value. And, the difference value is set in advance If it exceeds, it characterized in that it comprises the step of estimating the power generation performance by re-calculating the model coefficients. According to the present invention, it is possible to estimate the power generation performance of the photovoltaic power generation system irrespective of the installed capacity according to changes in the surrounding environment such as solar radiation intensity, temperature and wind speed, so that the performance improvement through the loss reduction of the photovoltaic power generation system, and the purpose of use Customized design optimized to meet the requirements of long-term reliability and stability performance and quality is possible.