ExcIEEEAC3A

Class Description

IEEE 421.5-2005 type AC3A model. The model represents the field-controlled alternator-rectifier excitation systems designated type AC3A. These excitation systems include an alternator main exciter with non-controlled rectifiers. The exciter employs self-excitation, and the voltage regulator power is derived from the exciter output voltage. Therefore, this system has an additional nonlinearity, simulated by the use of a multiplier whose inputs are the voltage regulator command signal, Va, and the exciter output voltage, Efd, times KR. This model is applicable to excitation systems employing static voltage regulators.
Reference: IEEE 421.5-2005, 6.3.

Attributes

Name Type Description
efdn PU Value of Efd at which feedback gain changes (EFDN) (> 0). Typical value = 2,36.
ka PU Voltage regulator gain (KA) (> 0). Typical value = 45,62.
kc PU Rectifier loading factor proportional to commutating reactance (KC) (>= 0). Typical value = 0,104.
kd PU Demagnetizing factor, a function of exciter alternator reactances (KD) (>= 0). Typical value = 0,499.
ke PU Exciter constant related to self-excited field (KE). Typical value = 1.
kf PU Excitation control system stabilizer gains (KF) (>= 0). Typical value = 0,143.
kn PU Excitation control system stabilizer gain (KN) (>= 0). Typical value = 0,05.
kr PU Constant associated with regulator and alternator field power supply (KR) (> 0). Typical value = 3,77.
seve1 Float Exciter saturation function value at the corresponding exciter voltage, VE1, back of commutating reactance (SE[VE1]) (>= 0). Typical value = 1,143.
seve2 Float Exciter saturation function value at the corresponding exciter voltage, VE2, back of commutating reactance (SE[VE2]) (>= 0). Typical value = 0,1.
ta Seconds Voltage regulator time constant (TA) (> 0). Typical value = 0,013.
tb Seconds Voltage regulator time constant (TB) (>= 0). Typical value = 0.
tc Seconds Voltage regulator time constant (TC) (>= 0). Typical value = 0.
te Seconds Exciter time constant, integration rate associated with exciter control (TE) (> 0). Typical value = 1,17.
tf Seconds Excitation control system stabilizer time constant (TF) (> 0). Typical value = 1.
vamax PU Maximum voltage regulator output (VAMAX) (> 0). Typical value = 1.
vamin PU Minimum voltage regulator output (VAMIN) (< 0). Typical value = -0,95.
ve1 PU Exciter alternator output voltages back of commutating reactance at which saturation is defined (VE1) (> 0). Typical value = 6,24.
ve2 PU Exciter alternator output voltages back of commutating reactance at which saturation is defined (VE2) (> 0). Typical value = 4,68.
vemin PU Minimum exciter voltage output (VEMIN) (<= 0). Typical value = 0.
vfemax PU Exciter field current limit reference (VFEMAX) (>= 0). Typical value = 16.

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