Description

The IEEEVC compensator model was developed in line with the references [1] [2]. IEEEVC simulates an impedance and allows the machine voltage regulator to sense a calculated voltage at some point other than the terminals of the machine [1]. The model also calculates the compensated reference voltage for the exciter based on the impedance parameters Rc, Xc and the desired machine terminal voltage value.

Mask and Parameters

AVR parameters

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

Name		Description	Unit	Parameter range
Rc		Resistance of the simulated impedance (on machine base)	pu	--
Xc		Reactance of the simulated impedance (on machine base)	pu	--
Synchronous machine type		The type of the synchronous machine 0: pu standard 1: thermal or hydraulic		{0,1}
Used for pu standard machine	Vt_real	Machine terminal voltage real part from the load flow solution (=SM.Vpos_real)	pu	--
	Vt_imag	Machine terminal voltage imaginary part from the load flow solution (=SM.Vpos_imag)	pu	--
	It_real	Machine terminal current real part from the load flow solution (=SM.Ipos_real)	pu	--
	It_imag	Machine terminal current imaginary part from the load flow solution (=SM.Ipos_imag)	pu	--
Used for thermal or hydraulic machine	P	Machine active power output (=SM.Peo)	W	--
	Q	Machine reactive power output (=SM.Qeo)	Var	--
	Sbase	Machine electrical power base (=SM.baseMVA)	MVA	--
	Vbase	Machine voltage base (=SM.baseVolt)	kV	--
	Itpeak	Machine terminal voltage peak value from the load flow solution (=SM.IInit_mag)	A	--

Inputs and Outputs and Additional Signals Available for Monitoring

Inputs

Name	Description	Unit
Vd	Generator d axis terminal voltage	pu
Vq	Generator q axis terminal voltage	pu
Id	Generator d axis terminal current	pu
Iq	Generator q axis terminal current	pu
Vref	The reference value for machine terminal voltage	pu

Outputs

Name	Description	Unit
Vc1	Compensated terminal voltage	pu
Vrefc	The calculated reference voltage for the exciter considering the compensation	pu

The output Vrefc is calculated based on Rc, Xc and the input Vref, which is the desired value of the machine terminal voltage. This Vrefc signal can be connected to the exciter Vref input. Depending on the type of the synchronous machine, the available machine variables from load flow calculations are different.

If a thermal or hydraulic synchronous machine is used,

If a pu standard synchronous machine is used,

The HYPERSIM simulation option Set Initial Conditions must be checked for the calculation to work properly.

References

1. IEEE, "IEEE Recommended Practice for Excitation System Models for Power System Stability Studies," IEEE Std 421.5-2016 (Revision of IEEE Std 421.5-2005), pp. 1-207, 26 Aug. 2016

2. PSS®E 34.2.0 Model Library. NY, USA: Siemens Industry, Inc., 2017.