1 Description
2 Mask and Parameters
- 2.1 Exciter Parameters
- 2.2 Initial Values
3 Inputs, Outputs and Signals Available for Monitoring
- 3.1 Inputs
- 3.2 Outputs
4 References

Description

This model is based on Type AC6A IEEE excitation system model. The model shown in the figure below is used to represent field-controlled alternator-rectifier excitation systems with system-supplied electronic voltage regulators.

IEEE, "IEEE Recommended Practice for Excitation System Models for Power System Stability Studies," in IEEE Std 421.5-2005 (Revision of IEEE Std 421.5-1992) , vol., no., pp.1-93, 21 April 2006.

Mask and Parameters

Exciter Parameters

Expanding the "ESAC6A diagram" displays the block diagram in the parameters window.

Name	Description	Unit

Name	Description	Unit
Tr	Filter time constant	s
Ka	Voltage regulator gain	pu
Ta	Voltage regulator time constant	s
Tk	Voltage regulator time constant	s
Tb	Voltage regulator time constant	s
Tc	Voltage regulator time constant	s
VAmax	Maximum voltage regulator output	pu
VAmin	Minimum voltage regulator output	pu
VRmax	Maximum voltage regulator output	pu
VRmin	Minimum voltage regulator output	pu
Te	Exciter time constant, integration rate associated with exciter control	s
VFELIM	Exciter field current limit reference	pu
Kh	Exciter field current limit gain	pu
Th	Exciter field current limiter time constant	s
Tj	Exciter field current limiter time constant	s
Kc	Rectifier loading factor proportional tp commutating reactance	pu
Kd	Demagnetizing factor, a function of exciter alternator reactances	pu
Ke	Exciter constant related to self-excited field	pu

Expanding the "Se(Ve)" displays the block diagram in the parameters window.

Name	Description	Unit

Name	Description	Unit
Ve1	Exciter alternator output voltages back of commutating reactance at which saturation is defined.	pu
Se1	Exciter saturation function value at the corresponding exciter voltage, Ve1, back of commutating reactance.	pu
Ve2	Exciter alternator output voltages back of commutating reactance at which saturation is defined.	pu
Se2	Exciter saturation function value at the corresponding exciter voltage, Ve1, back of commutating reactance.	pu

Initial Values

Name	Description	Unit

Name	Description	Unit
Efd0	Initial exciter output voltage	pu
Ifd0	Initial exciter output current	pu

Inputs, Outputs and Signals Available for Monitoring

Inputs

Name	Description	Unit

Name	Description	Unit
E_C	Output of terminal voltage transducer and load compensation elements	pu
V_UEL	Underexcitation limiter output	pu
V_OEL	Overexcitation limiter output	pu
V_Othsg	Stabilizer VOTHSG output	pu
V_S	Is defined as the output voltage of a Power System Stabilizer (PSS) [1].	pu
V_REF	Voltage regulator reference voltage	pu
I_FD	Synchronous machine field current	pu

Outputs

Name	Description	Unit

Name	Description	Unit
EFD	Exciter output voltage	pu

References

[1] "IEEE Recommended Practice for Excitation System Models for Power System Stability Studies," in IEEE Std 421.5-2005 (Revision of IEEE Std 421.5-1992) , vol., no., pp.1-93, 21 April 2006, doi: 10.1109/IEEESTD.2006.99499.