1. CMPLDW2 – Prototype Modular Structure WECC LMTF Meeting March 2017
Bill Price
GE Energy Consulting

2. CMPLDW2 Model Schematic
Modular Model Structure
CMPLDW2 Model Schematic 2
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3. CMPLDW2 – 2nd-generation Composite Load Model
Modular Structure
Add new component models (without modifying main model)
Permit user-written component models
Minimize Input data
Data for load components do not need to be repeated
for each instance of model that uses same parameter values
CMPLDW2 input records identify location of data associated with each component and fractions of each component
If composition is the same for a load zone (climate zone), input only once using _CMPLDW2 data management model
PSLF Implementation Status
CMPLDW2 available in V19.1.
_CMPLDW2 available in V21
Next steps:
Implement user-written submodel interface
Implement other submodels, e.g. DER_A 3
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4. CMPLDW2 – Data Input Format
cmpldw2 <busno> “bus name” <bus kv> “id” : #r mva=<value> /
disttype distdat /
load1type load1datID load1frac /
load2type load2datID load2frac /
load3type load3datID load3frac /
load4type load4datID load4frac /
load5type load5datID load5frac /
load6type load6datID load6frac /
… … …
loadNtype loadNdatID loadNfrac
“X”type is the name of the component sub-model
“X”datID is the identifying number of component’s data management (DM) model
“X”frac is the fraction of load for that component (-1 to indicate 1. - S(other fractions) ) 4
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5. Sample CMPLDW2 Input Data
cmpldw2 11 "LOAD-CMP" "MC" : #1 mva=-0.8 /
cmp_dist /
cmp_dgpv  /
cmp_mot /
cmp_mot /
cmp_mot /
cmp_1pac /
  cmp_stat  -101  /
  cmp_elec 
 Notes:
cmp_dist, cmp_mot3, etc. are not in quotes because they are parameter values, not parameter names. Parameter names could be added but are not necessary.
“cmp” prefix identifies these as CMPLDW2 component sub-models
“cmp” models do not appear in dynamic data file (.dyd); only their DM models “_cmp” appear. 5
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6. CMPLDW2 – Component DM Models
PSLF Data Management (DM) Models (for existing components)
_cmp_dist – distribution equivalent model
_cmp_stat – static load model
_cmp_elec – electronic load model
_cmp_mot3 – 3-phase induction motor
_cmp_1pac – single-phase A/C performance model
_cmp_dgpv – simplified PV DER model
Initial underscore indicates it is a DM model referenced by a negative numeric ID.
Data input once for a particular set of parameter values, e.g.
_cmp_stat : "Pfs" 1 "P1e" 2 "P1c" 0 "P2e" 1 "P2c" 1 "Pfreq" 0 /
"Q1e" 2 "Q1c" 1 "Q2e" 1 "Q2c" 0 "Qfreq" -1
Data ID number (e.g. -20) is used to reference this data in CMPLDW2 data – must be negative and unique within data set.
Data can be viewed and edited in Model Edit (edmd) table and Model Record Editor
Changes will affect all models using this data. 6
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7. _CMPLDW2 – Group data input for CMPLDW2
Format
_cmpldw2 <num> “group name” <group type> : #r mva=<-value> /
“Pmin” <value> PQmin <value> Vmin <value> /
<cmpldw2 parameters>
group type group name
0 (or omitted) climate (load) zone
(-1) area name (area number)
(-2) zone name (zone number)
(-3) owner name (owner number
Program treats this as a Data Management model, thus the initial underscore
A CMPLDW2 model is automatically created for each load in the group
Model is not created if Pload < Pmin or P/Q < PQmin or Vbus < Vmin
Model is not created if a specific CMPLDW2 model is in the case
<num> - data record ID (negative number) 7
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8. _CMPLDW2 – Group data input for CMPLDW2
Data input example for a load (climate) zone:
_cmpldw2 -55 “NCI_RES” 0 : #1 mva=-0.9 /
“Pmin” 50. “Pfmin” “Vmin” 0.8/
cmp_dist /
cmp_dgpv /
cmp_mot /
cmp_mot /
cmp_mot /
cmp_1pac /
  cmp_stat  -101  -1. /
  cmp_elec  8
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9. Proposed Distributed Generation Modeling
When large, utility-scale DG (U-DER) is present
Include substation transformer in powerflow model
Include powerflow generator model at low-side bus
Use any dynamic DG model (e.g. PVD1)
Omit transformer from CMPLDW2 model (X = 0.) 9
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10. Other recent changes in CMPLDW, CMPLDWG, and CMPLDW2
Global parameters to omit composite load model if:
Pload < dypar[0].cmp_pmin
Pload / Qload < dypar[0].cmp_pqmin
Vbus < dypar[0].cmp_vmin
All default to 0., user can set in javaini.p
1PAC – Vstallbrk is always intersection of curves.
1PAC – removed clipping of compressor voltage at 1.2 p.u.
MOT3 – permit reconnection after full UV trip (states held constant during trip) 10
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