Mask and Parameters

General Parameters

Description	Use this field to add all kinds of information about the component
Dynamic load status	If “Enable”, the load is ON; if “Disable”, the load is OFF
Measuring filter status	If “Enable”, the measuring filter is ON, and if “Disable”, the filter is OFF; The measurement filter is a second order Butterworth filter applied on the Vd and Vq voltage components extracted from the positive-sequence voltage input.
Base power (total)	Base value pour PU conversion (MVA)
Base voltage (rmsLL)	Base value pour PU conversion (kV)
Base frequency	Base value pour PU conversion (Hz)

Dynamic Load Parameters

V_min:	Voltage threshold below which the load behaves as a constant impedance (pu)
U₀	Nominal voltage in relation to the base voltage (pu)
P₀	Nominal active power at U0 (MW)
Q₀	Nominal reactive power at U0 (Mvar)
R_s	Series resistance (ohm)
L_s	Series inductance (H)
R_p	Shunt resistance (ohm)
L_p	Shunt inductance (H)
C_p	Shunt capacitance (F)
n_p	Active power variation coefficient as a function of the voltage
n_q	Reactive power variation coefficient as a function of the voltage
k_p	Active power variation coefficient as a function of the frequency
k_q	Reactive power variation coefficient as a function of the frequency
T_p1	Time constant to calculate the active power of the load
T_p2	Time constant to calculate the active power of the load
T_q1	Time constant to calculate the reactive power of the load
T_q2	Time constant to calculate the reactive power of the load

Harmonic Load Mask: Random Load

Seed for P0 and Q0	Root for the random generation of P0 and Q0
Seed for T	Root for the random generation of each interval
Tmin	Minimum time interval between two changes of P0 and Q0. The distribution is always uniform between Tmin and Tmax.
Tmax	Maximum time interval between two changes of P0 and Q0. The distribution is always uniform between Tmin and Tmax.
P0 distribution	Specify distribution type for P0(Uniform / Gaussian)
P0min	In the case of a uniform distribution, minimum value of P0 (MW)
P0max	In the case of a uniform distribution, maximum value of P0 (MW)
P0avg	In the case of a Gaussian distribution, average value of P0 (MW)
P0var	In the case of a Gaussian distribution, variance value of P0 (MW)
Q0 distribution	Specify distribution type for Q0(Uniform / Gaussian)
Q0min	In the case of a uniform distribution, minimum value of Q0 (Mvar)
Q0max	In the case of a uniform distribution, maximum value of Q0 (Mvar)
Q0avg	In the case of a Gaussian distribution, average value of Q0 (Mvar)
Q0var	In the case of a Gaussian distribution, variance value of Q0 (Mvar)

Harmonic Load Mask: Harmonic Current Source

Harmonic numbers:	The number of each harmonic to inject as current
Harmonic current amplitudes relative to fundamental	Current amplitude for each harmonic (% of current of the fundamental)
Harmonic current phases relative to fundamental	Current phase for each harmonic (degrees relative to the phase of the fundamental)

E(a,b,c)	Output voltage of the dynamic load (V)
Ed	Direct (D) axis output voltage (pu)
Eq	Quadrature (Q) axis output voltage (pu)
Frequency	Network frequency (Hz)
FundAng_a	Angle value of the fundamental current of the load for phase A (degrees)
Harmo	(deg)
I(a,b,c)	Current of the dynamic and random loads only; does not include the harmonic current (A)
I(a,b,c)Fund	Value of the current of the fundamental (A)
I(a,b,c)Harm	Harmonic current to be injected by the current source only (A)
I(a,b,c)Total	Total current of the harmonic load; includes the dynamic and random parts along with the injected harmonic current (A)
P	Total active power of the load (pu)
Pcomp	Compensating active power; originating from the internal voltage source (pu)
Period	Inverse of the frequency (s)
Po	Reference value for active power of the load, including random variations (pu)
Q	Total reactive power of the load (pu)
Qcomp	Compensating reactive power; originating from the internal voltage source (pu)
Qo	Reference value for reactive power of the load, including random variations (pu)
V(a,b,c)	Value of the internal voltage of the source allowing to inject the desired power (V)
Vd	Direct (D) axis voltage (pu)
Vq	Quadrature (Q) axis voltage (pu)
Vrms	Average value of the positive-sequence voltage (pu)

For more information on the dynamic load, read here.

The two main differences between the dynamic and the harmonic loads are the following:

Firstly, a programmable random variation part can be added to the P1 and Q1 power components provided by the internal source.
Secondly, the same load calculates a percentage of harmonics based on the fundamental and can then re-inject these harmonics as current.

Harmonic Load Diagram