Distribution Equivalent Type Model: Distribution

 

Model Equations and/or Block Diagrams

This equivalent model and the parameters used for the Load Distribution Equivalent Types are the same as the first 17 parameters of the CMPLDW load characteristic model, along with an MVA base parameter.

Model supported by PowerWorld

Parameters:

Number	Number: field not used inside Simulator. This is an identifier which is used to maintain compatibility with the negative numbers used within the DYD syntax. When writing out to a DYD file, we will automatically ensure uniqueness across all load components and distribution equivalents.
XFMinkV	XFMinkV: when a load has a terminal bus nominal kV below this value, then the transformer of the distribution equivalent will be ignored during the transient stability simulation
Mbase	Mbase: Determines how the distribution equivalent MVABase is calculated for loads.
Mbase>0 means DistMVABase = Mbase;	Mbase<0 means DistMVABase = LoadMW/abs(Mbase);
Mbase=0 means DistMVABase = LoadMW/0.8.	Each load record can override this by specifying the TSDistEquivMVABase directly as well.
Bss	Bss: Substation shunt capacitor susceptance, p.u.
Rfdr	Rfdr: Feeder equivalent resistance, p.u.
Xfdr	Xfdr: Feeder equivalent reactance, p.u.
Fb	Fb: Fraction of feeder shunt capacitance at substation bus end
Xxf	Xxf: Substation transformer reactance, p.u.
Tfixhs	Tfixhs: Transformer high side fixed tap, p.u.
Tfixls	Tfixls: Transformer low side fixed tap, p.u.
LTC	LTC: 1 for automatic tap adjustment (low side variable tap)
Tmin	Tmin: Minimum variable tap, p.u.
Tmax	Tmax: Maximum variable tap, p.u.
step	step: Variable tap step size, p.u.
Vmin	Vmin: Minimum low-side voltage, p.u.
Vmax	Vmax: Maximum low-side voltage, p.u.
Tdel	Tdel: Time delay to initiate tap adjustment, sec.
Tdelstep	Tdelstep: Time delay between tap steps, sec.
Rcmp	Rcmp: Transformer LTC compensating resistance, p.u.
Xcmp	Xcmp: Transformer LTC compensating reactance, p.u.