Smart Grids and Micro-Grids. Umashankar Subramaniam
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is accurate with minimum convergence error compared to GS method. Similarly, the results obtained under varying irradiance and temperature conditions for PV panel such as KD245GX and Shell SP70 using GS and NR techniques are given in Tables 1.4 and 1.5, respectively. It is seen that the parameters such as A, Rse, ILG, Isat increases as there is increase in operating temperature of PV panel. On the flipside, the shunt resistance Rsh decreases with increasing in temperature. Similar observation is found in both the techniques, however the maximum power obtained from NR technique is higher than the GS method.
Table 1.2 Estimated values of five parameters using GS method at STC [15].
| PV module | Estimated parameters at STC | ||||
| A | Rse (Ω) | Rsh (Ω) | Ilg (A) | Isat (A) | |
| KD245GX | 1.43 | 0.156 | 623.23 | 8.91 | 4.71E-07 |
| U5-80 | 1.606 | 0.009 | 68.1 | 5.21 | 2.79E-06 |
| Shell SP70 | 1.553 | 0.324 | 321.22 | 4.7 | 1.56E-06 |
Table 1.3 Estimated values of five parameters using NR method at STC.
| PV module | Estimated parameters at STC | ||||
| A | Rse (Ω) | Rsh (Ω) | Ilg (A) | Isat (A) | |
| KD245GX | 1.429 | 0.1562 | 623.235 | 8.9122 | 4.67E-07 |
| U5-80 | 1.6043 | 0.0086 | 66.6312 | 5.2107 | 2.76E-06 |
| Shell SP70 | 1.5536 | 0.3242 | 321.2234 | 4.2543 | 1.42E-06 |
Table 1.4 Estimation of PV module parameters under change in irradiance and temperature using GS method [15].
| PV Modules | G (W/m2) | T(°C) | A | Rse (Ω) | Rsh (Ω) | Ilg (A) | Isat (A) | Vmpp (V) | Impp (A) | Pmpp (W) |
| KD245GX | 1000 | 30 | 1.432 | 0.157 | 621.37 | 8.94 | 8.39E-07 | 29.11 | 8.23 | 239.61 |
| 1000 | 50 | 1.45 | 0.159 | 614.02 | 9.05 | 7.04E-06 | 26.38 | 8.21 | 216.64 | |
| 1000 | 70 | 1.483 | 0.16 | 606.84 | 9.15 | 4.62E-05 | 23.68 | 8.16 | 193.14 | |
| 800 | 25 | 1.449 | 0.125 | 779.04 | 7.13 | 5.89E-07 | 29.69 | 6.58 | 195.47 | |
| 600 | 25 | 1.47 | 0.094 | 103.87 | 5.35 | 7.89E-07 | 29.34 | 4.93 | 144.72 | |
| Shell SP70 | 1000 | 25 | 1.553 | 0.324 | 321.22 | 4.7 | 1.56E-06 | 16.51 | 4.25 | 70.16 |
| 800 | 25 | 1.577 | 0.259 | 401.53 | 3.76 | 1.57E-06 | 16.59 |
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