| Types.PerUnit | Ka | | Voltage regulator gain |
| Types.PerUnit | Kc | | Rectifier load factor |
| Types.PerUnit | Kd | | Exciter demagnetizing factor |
| Types.PerUnit | Ke | | Exciter field gain |
| Types.PerUnit | Kf | | Exciter rate feedback gain |
| Types.Time | tA | | Voltage regulator time constant in s |
| Types.Time | tB | | Voltage regulator lead time constant in s |
| Types.Time | tC | | Voltage regulator lag time constant in s |
| Types.Time | tE | | Exciter time constant in s |
| Types.Time | tF | | Exciter rate feedback time constant in s |
| Types.Time | tR | | Stator voltage time constant in s |
| Real | UHigh | 0.75 | Upper limit of non-linear mode of rectifier characteristic |
| Real | ULow | 0.433 | Lower limit of non-linear mode of rectifier characteristic |
| Types.VoltageModulePu | VExcHighPu | | Higher abscissa of saturation characteristic in pu (user-selected base voltage) |
| Types.VoltageModulePu | VExcLowPu | | Lower abscissa of saturation characteristic in pu (user-selected base voltage) |
| Types.VoltageModulePu | VExcSatHighPu | | Higher ordinate of saturation characteristic in pu (user-selected base voltage) |
| Types.VoltageModulePu | VExcSatLowPu | | Lower ordinate of saturation characteristic in pu (user-selected base voltage) |
| Types.VoltageModulePu | VrMaxPu | | Maximum output voltage of voltage regulator in pu (user-selected base voltage) |
| Types.VoltageModulePu | VrMinPu | | Minimum output voltage of voltage regulator in pu (user-selected base voltage) |
| Real | A1 | (1 - sqrt(UHigh - ULow^2))/ULow | Rectifier characteristic coefficient of first linear mode |
| Real | A2 | sqrt(UHigh/(1 - UHigh)) | Rectifier characteristic coefficient of second linear mode |
| Types.PerUnit | Bsq | if VExcHighPu > VExcThresholdPu then VExcHighPu*VExcSatHighPu/(VExcHighPu - VExcThresholdPu)^2 else 0 | Proportional coefficient of saturation characteristic |
| Types.PerUnit | Sq | if (VExcHighPu > 0 and VExcSatHighPu > 0) then sqrt(VExcLowPu*VExcSatLowPu/(VExcHighPu*VExcSatHighPu)) else 0 | Ratio of staturation characteristic |
| Types.VoltageModulePu | VExcThresholdPu | (VExcLowPu - VExcHighPu*Sq)/(1 - Sq) | Input voltage below which saturation function output is zero, in pu (user-selected base voltage) |
| Types.VoltageModulePu | Efd0Pu | | Initial excitation voltage in pu (user-selected base voltage) |
| Types.CurrentModulePu | Ir0Pu | | Initial rotor current in pu (base SNom, user-selected base voltage) |
| Types.VoltageModulePu | Us0Pu | | Initial stator voltage in pu (base UNom) |
| Real | Ua0 | Kc/(1 + A1*Kc) | Estimated initial input for first linear mode of rectifier characteristic |
| Real | Ub0 | Kc*sqrt(UHigh/(1 + Kc^2)) | Estimated initial input for quadratic mode of rectifier characteristic |
| Real | Uc0 | Kc*A2/(1 + A2*Kc) | Estimated initial input for second linear mode of rectifier characteristic |
| Types.VoltageModulePu | UsRef0Pu | Vr0Pu/Ka + Us0Pu | Initial reference stator voltage in pu (base UNom) |
| Types.VoltageModulePu | VExc0Pu | Efd0Pu/Y0 | Output voltage of integrator in pu (user-selected base voltage) |
| Types.VoltageModulePu | Vr0Pu | (if VExc0Pu > VExcThresholdPu then Bsq*(VExc0Pu - VExcThresholdPu)^2 else 0) + Ke*VExc0Pu + Kd*Ir0Pu | Initial output voltage of voltage regulator in pu (user-selected base voltage) |
| Real | Y0 | if Ua0 <= 0 then 1 elseif Ua0 <= ULow then 1 - A1*Ua0
elseif Uc0 >= 1 then 0
elseif Uc0 >= UHigh then A2*(1 - Uc0) else sqrt(UHigh - Ub0^2) | Estimated initial output of rectifier characteristic |
