ExcIEEEST7B

Class Description

IEEE 421.5-2005 type ST7B model. This model is representative of static potential-source excitation systems. In this system, the AVR consists of a PI voltage regulator. A phase lead-lag filter in series allows the introduction of a derivative function, typically used with brushless excitation systems. In that case, the regulator is of the PID type. In addition, the terminal voltage channel includes a phase lead-lag filter. The AVR includes the appropriate inputs on its reference for overexcitation limiter (OEL1), underexcitation limiter (UEL), stator current limiter (SCL), and current compensator (DROOP). All these limitations, when they work at voltage reference level, keep the PSS (VS signal from PSS) in operation. However, the UEL limitation can also be transferred to the high value (HV) gate acting on the output signal. In addition, the output signal passes through a low value (LV) gate for a ceiling overexcitation limiter (OEL2).
Reference: IEEE 421.5-2005, 7.7.

Attributes

Name Type Description
kh PU High-value gate feedback gain (KH) (>= 0). Typical value = 1.
kia PU Voltage regulator integral gain (KIA) (>= 0). Typical value = 1.
kl PU Low-value gate feedback gain (KL) (>= 0). Typical value = 1.
kpa PU Voltage regulator proportional gain (KPA) (> 0). Typical value = 40.
oelin ExcST7BOELselectorKind OEL input selector (OELin). Typical value = noOELinput.
tb Seconds Regulator lag time constant (TB) (>= 0). Typical value = 1.
tc Seconds Regulator lead time constant (TC) (>= 0). Typical value = 1.
tf Seconds Excitation control system stabilizer time constant (TF) (>= 0). Typical value = 1.
tg Seconds Feedback time constant of inner loop field voltage regulator (TG) (>= 0). Typical value = 1.
tia Seconds Feedback time constant (TIA) (>= 0). Typical value = 3.
uelin ExcST7BUELselectorKind UEL input selector (UELin). Typical value = noUELinput.
vmax PU Maximum voltage reference signal (VMAX) (> 0 and > ExcIEEEST7B.vmin). Typical value = 1,1.
vmin PU Minimum voltage reference signal (VMIN) (> 0 and < ExcIEEEST7B.vmax). Typical value = 0,9.
vrmax PU Maximum voltage regulator output (VRMAX) (> 0). Typical value = 5.
vrmin PU Minimum voltage regulator output (VRMIN) (< 0). Typical value = -4,5.

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