V1 = 1.05;
V2 = 0.97817 - 0.059828i;
V3 = 1.038705 - 0.051892i;
z = 0.01 + 0.04i;

I1 = V1*(1/z +1/z) - (V2/z + V3/z)
S1 = 1.05*I1;
S = conj(S1)