Time-averaged passive rectifier, with power-correction.
AC_power = DC_power.
sigma-correction (comparison of AC and DC voltage):
sigma=1.0966227 +) increase S_dqo: better approximation at vAC smaller S_abs=(2*sqrt(6)/pi)*sigma 0) no correction: S_abs=(2*sqrt(6)/pi) -) decrease S_dqo: better approximation at vAC larger S_abs=(2*sqrt(6)/pi)/sigma
This is not yet a solution with sufficient precision.