ExcIEEEST3A

Class Description

IEEE 421.5-2005 type ST3A model. Some static systems utilize a field voltage control loop to linearize the exciter control characteristic. This also makes the output independent of supply source variations until supply limitations are reached. These systems utilize a variety of controlled-rectifier designs: full thyristor complements or hybrid bridges in either series or shunt configurations. The power source can consist of only a potential source, either fed from the machine terminals or from internal windings. Some designs can have compound power sources utilizing both machine potential and current. These power sources are represented as phasor combinations of machine terminal current and voltage and are accommodated by suitable parameters in model type ST3A which is represented by ExcIEEEST3A.
Reference: IEEE 421.5-2005, 7.3.

Attributes

Name Type Description
ka PU Voltage regulator gain (KA) (> 0). This is parameter K in the IEEE standard. Typical value = 200.
kc PU Rectifier loading factor proportional to commutating reactance (KC) (>= 0). Typical value = 0,2.
kg PU Feedback gain constant of the inner loop field regulator (KG) (>= 0). Typical value = 1.
ki PU Potential circuit gain coefficient (KI) (>= 0). Typical value = 0.
km PU Forward gain constant of the inner loop field regulator (KM) (> 0). Typical value = 7,93.
kp PU Potential circuit gain coefficient (KP) (> 0). Typical value = 6,15.
ta Seconds Voltage regulator time constant (TA) (>= 0). Typical value = 0.
tb Seconds Voltage regulator time constant (TB) (>= 0). Typical value = 10.
tc Seconds Voltage regulator time constant (TC) (>= 0). Typical value = 1.
thetap AngleDegrees Potential circuit phase angle (thetap). Typical value = 0.
tm Seconds Forward time constant of inner loop field regulator (TM) (> 0). Typical value = 0,4.
vbmax PU Maximum excitation voltage (VBMax) (> 0). Typical value = 6,9.
vgmax PU Maximum inner loop feedback voltage (VGMax) (>= 0). Typical value = 5,8.
vimax PU Maximum voltage regulator input limit (VIMAX) (> 0). Typical value = 0,2.
vimin PU Minimum voltage regulator input limit (VIMIN) (< 0). Typical value = -0,2.
vmmax PU Maximum inner loop output (VMMax) (> 0). Typical value = 1.
vmmin PU Minimum inner loop output (VMMin) (<= 0). Typical value = 0.
vrmax PU Maximum voltage regulator output (VRMAX) (> 0). Typical value = 10.
vrmin PU Minimum voltage regulator output (VRMIN) (< 0). Typical value = -10.
xl PU Reactance associated with potential source (XL) (>= 0). Typical value = 0,081.

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