Generic Excitation Programmable Parameters

The parameters are shown in the block diagram of the excitation system (ex_Tr, ex_Ka, ex_Ta, ex_Kf, ex_Tf, ex_Vtmax, ex_Vtmin, ex_Vrmin, ex_Vrmax, ex_Efdfix, Exci_on). In addition, the excitation system can be off and set to a constant value. Moreover, the excitation system can be modeled externally by a user-defined model, depending on the state of exci_mod switch.

• exci_on: Selection of excitation system operation. (On=Normal regulation; Off=constant excitation)
• exci_mod: Selection of excitation system model. (Internal = actual model; External = model supply by user)
• ex_Tr: Voltage measurement time constant, (sec)
• ex_Ka: Voltage regulator gain
• ex_Ta: Voltage regulator time constant (sec)
• ex_Kf: Damping filter feedback gain
• ex_Tf: Damping filter feedback time constant (sec)
• ex_Kp: Proportional gain on voltage limit
• ex_Vtmin: Minimum static limit on voltage measurement (pu)
• ex_Vtmax: Maximum static limit on voltage measurement (pu)
• ex_Vrmin: Minimum static limit of excitation voltage (pu)
• ex_Vrmax: Maximum static limit of excitation voltage; The maximum limit applied to the regulator transfer function is always the minimal value between the output of the Kp gain and the ex_Vrmax value.
• ex_Efdfix: Constant excitation voltage. Used when Exci_on is off.