Читать книгу Smart Grids and Micro-Grids - Umashankar Subramaniam - Страница 19

For accurate evaluation of maximum power point of SPV panel, the initial values of V_mpp and I_mpp should be selected properly using the known values of V_oc and I_sc under STC. The variation of parameters like V_t(GT), R_se(GT), and R_sh(GT) with respect to operating temperature and irradiance can be deduced using equations shown below [15],

(1.25)

(1.26)

(1.27)

To determine the voltage at MPP, (1.6) has been modified as a function of irradiance and temperature as represented below,

(1.28)

Where,

Also, the current at MPP can be deduced by rearranging (1.7) as a function of irradiance and temperature as,

(1.29)

Where,

Equation (1.28) and (1.29) are transcendental equation and the solution can be obtained through numerical techniques.