Читать книгу Smart Grids and Micro-Grids - Umashankar Subramaniam - Страница 27

In this chapter, the GS and NR methods were used to estimate the five unknown parameters of SDM of PV panel such as KD245GX, U5-80 and Shell SP70 under STCs. The results have shown better performance for the NR technique compared to GS method. Further, both the approaches were used to deduce the parameters of KD245GX and Shell SP70 PV panel under dynamic environmental conditions of varying irradiance and temperature. The unknown parameters like A, R_se, R_sh, I_sat, and I_LG are estimated for wide range of operating conditions and the result shows better convergence for both the techniques. However, the MPP obtained from NR technique is found to be more than the GS method under varying irradiance and temperature condition. In order to validate the feasibility of presented NR approach a HST60FXXXP, 250 W panel was experimentally tested under dynamic environmental conditions. The results of I-V and P-V characteristics obtained using estimated parameters from NR technique through simulation has good agreement with the experimental result. Thus, the results have shown that the maximum power output from the panel decreases as the solar irradiance decreases due to increase in shunt resistance of the panel.