Comparative Analysis of Decomposition Models with Site-fitted Coefficients for Seoul

서울지역 지역계수가 적용된 직산분리 모델의 성능 비교

Abstract

Decomposition models are essential in TMY development and solar energy system design. Up until recently, only a few decomposition model related researches are implemented in Korea due to lack of measured direct normal solar irradiance. In contrast, numerous researches have been conducted in various countries, and some quasi-universal composition models have been recommended by several papers. In this research, three decomposition models - Watanabe model, Reindl-2 model and Engerer1 model - are selected and their site-fitted coefficients are developed using measured direct normal solar irradiance in Seoul. R-squared, RMSE, MBE of the site-fitted models are compared with the case of original coefficients and then each other. The comparison result shows that the Reindl-2 model with site-fitted coefficients is best suitable for Seoul. Further researches will be conducted to find the best model using more various measured data of Korean cities and site-fitting methods.

Fig. 1 Verification of Io calculation result against Sandia Method

Fig. 2 Verification of sin h calculation result against NOAA Method

Fig. 3 Diagram of site-fit coefficient estimate process

Fig. 4 Comparative scatter plots of Watanabe Model

Fig. 5 Comparative scatter plots of Reindl-2 Model

Fig. 6 Scatter plot Engerer1 Model

Table 1 Features of Measured GHI & DNI data

Table 2 Site-fitted coefficient of Seoul by Watanabe Model

Table 3 Site-fitted coefficient of Seoul by Reindl-2 Model

Table 4 Comparison of Estimation results of Seoul Decomposition models