We calculated 240 model atmospheres for carbon giants of high carbon abundances (2800 ≤ T_ef ≤ 3400 K, 0.06 ≤ log(C/O) ≤ 2.7). The set of models was used for modelling of spectral energy distribution for the evolved carbon star DY Per showing photometrical features of the R CrB type stars. The majority of the models are metal-deficient ones (-3.5 ≤ [Fe/H] < 0), part of them was calculated with hidrogen deficiency (1/9 ≤ H/He < 9/1). For the model atmosphere calculations, we used classical approaches with taking into account the relevant opacity sources in carbon stars. The opacity sampling method was applied to calculate the opacity due to atomic and molecular line absorption.