ExcIEEEAC8B

Class Description

IEEE 421.5-2005 type AC8B model. This model represents a PID voltage regulator with either a brushless exciter or DC exciter. The AVR in this model consists of PID control, with separate constants for the proportional (KPR), integral (KIR), and derivative (KDR) gains. The representation of the brushless exciter (TE, KE, SE, KC, KD) is similar to the model type AC2A. The type AC8B model can be used to represent static voltage regulators applied to brushless excitation systems. Digitally based voltage regulators feeding DC rotating main exciters can be represented with the AC type AC8B model with the parameters KC and KD set to 0. For thyristor power stages fed from the generator terminals, the limits VRMAX and VRMIN should be a function of terminal voltage: VT x VRMAX and VT x VRMIN.
Reference: IEEE 421.5-2005, 6.8.

Attributes

Name Type Description
ka PU Voltage regulator gain (KA) (> 0). Typical value = 1.
kc PU Rectifier loading factor proportional to commutating reactance (KC) (>= 0). Typical value = 0,55.
kd PU Demagnetizing factor, a function of exciter alternator reactances (KD) (>= 0). Typical value = 1,1.
kdr PU Voltage regulator derivative gain (KDR) (>= 0). Typical value = 10.
ke PU Exciter constant related to self-excited field (KE). Typical value = 1.
kir PU Voltage regulator integral gain (KIR) (>= 0). Typical value = 5.
kpr PU Voltage regulator proportional gain (KPR) (> 0 if ExcIEEEAC8B.kir = 0). Typical value = 80.
seve1 Float Exciter saturation function value at the corresponding exciter voltage, VE1, back of commutating reactance (SE[VE1]) (>= 0). Typical value = 0,3.
seve2 Float Exciter saturation function value at the corresponding exciter voltage, VE2, back of commutating reactance (SE[VE2]) (>= 0). Typical value = 3.
ta Seconds Voltage regulator time constant (TA) (>= 0). Typical value = 0.
tdr Seconds Lag time constant (TDR) (> 0). Typical value = 0,1.
te Seconds Exciter time constant, integration rate associated with exciter control (TE) (> 0). Typical value = 1,2.
ve1 PU Exciter alternator output voltages back of commutating reactance at which saturation is defined (VE1) (> 0). Typical value = 6,5.
ve2 PU Exciter alternator output voltages back of commutating reactance at which saturation is defined (VE2) (> 0). Typical value = 9.
vemin PU Minimum exciter voltage output (VEMIN) (<= 0). Typical value = 0.
vfemax PU Exciter field current limit reference (VFEMAX). Typical value = 6.
vrmax PU Maximum voltage regulator output (VRMAX) (> 0). Typical value = 35.
vrmin PU Minimum voltage regulator output (VRMIN) (<= 0). Typical value = 0.

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