Smart Grids and Micro-Grids. Umashankar Subramaniam

G (W/m2) Vmpp(V) Impp(A) Vmpp(V) Impp(A) Vmpp(V) Impp(A) Vmpp(V) Impp(A) Vmpp(V) Impp(A) 1000 16.5 4.24 16.37 4.25 16.29 4.27 16.51 4.25 16.4975 4.2498 800 16.56 3.42 16.43 3.39 16.38 3.41 16.59 3.41 16.5814 3.4061 600 16.55 2.57 16.41 2.53 16.39 2.54 16.49 2.55 16.4755 2.5542 400 16.35 1.72 16.24 1.66 16.26 1.67 16.12 1.7 16.0935 1.6979 200 15.87 0.87 15.66 0.79 15.73 0.81 15.18 0.84 15.1603 0.8415

Table 1.9 Comparative analysis of maximum power at MPP for Shell SP70 panel with T=25°C.

G(W/m2)	Sandia model [22]	Based on actual equivalent parameters [18]	ANFIS [18]	GS [15]	NR
1000	69.96	69.5725	69.5583	70.16	70.1122
800	56.6352	55.6977	55.8558	56.52	56.4832
600	42.5335	41.5173	41.6306	42.11	42.0926
400	28.122	26.9584	27.1542	27.35	27.3231
200	13.8069	12.3714	12.7413	12.77	12.7591

1.5 Conclusion

      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.

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