WECC REMTF
Workshop
Spencer Tacke
[email protected]
WECC Renewable Energy System
Models Workshop
March 9, 2016
REMTF Workshop
 Accurate,
validated models are required
for reliable and economic power system
operations
 NERC Reliability Standards require that
power flow and dynamics models be
provided
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REMTF Workshop
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Under WECC modeling guidelines (i.e.,
Generating Unit Model Validation Policy), all
wind and PV power plants with aggregated
capacity 20 MVA or larger must be modeled
explicitly in WECC power flow and dynamics
base cases, using models in the WCC
Approved Dynamic Model Library
Manufacturer-specific dynamic models
commonly provided for interconnection studies
are not adequate for regional planning. WECC
requires the use of approved models.
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Recent Data Gathered by
PPMVDTF
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WECC base cases have close to 29 GW of total
wind generation
74 plants with 5 GW of generating capacity are
connected at 24 to 35-V level, and therefore
have no collector system representation
94 plants with 5.2 GW of generating capacity
have no dynamic models
54 plants with 2.8 GW of generating capacity
are modeled with inappropriate dynamic
models
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REMTF Workshop
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There is a significant opportunity for model
improvement
The REMTF (under the MVWG) has led a multiyear effort developing dynamic models for
wind and PV generators
The effort has been a broad industry effort
The collaborative community has worked under
the auspices of the WECC and the REMTF, and
the developed models have been WECC
approved and are in major commercial
software platforms
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Wind Generation Dynamic
Models
 Development
was done in phases
 Initial implementation of type 3 and 4 types
represented a limited set of manufacturers
 Recently developed second generation
models have the capabilities to capture a
wider group of wind generation turbine
makes and models
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Grid-Connected PV Systems
 Most
are residential and commercial scale
connected to distribution networks
 But many are large generation facilities
connected to the transmission system
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Second Generation Models
They were developed deliberately in a
modular format to facilitate the ability to add
new features and functions to the library of
models without significant effort
 1st generation models were developed
without the flexibility to represent various
vendor equipment
 2nd generation models were developed
with more flexibility and were validated
against several vendor data
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Goals of Second Generation
Generic Models
 Allow
for easy implementation of new
modules to build on existing components
and allow for the ever-growing and
changing technology, and
 Allow for emulation of a wider range of
control philosophies and thus the ability to
be parameterized for representing a wide
range of equipment
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Wind Turbine Diagrams
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The 2nd Generation Renewable
Energy System (RES) Models
Model
Function
1st or 2nd Generation
regc_a
RES Generator/Converter Model
2nd
reec_a
RES Electrical Controls Model A
2nd
reec_b
RES Electrical Controls Model B
2nd
reec_c
RES Electrical Controls Model C
2nd
repc_a
RES Plant Controls Model A
2nd
repc_b
RES Plant Controls Model B
2nd (not yet finalized)
wtgt_a
WTG Turbine Shaft Model A
2nd
wtgar_a
WTC Aero-dynamic Model A
2nd
wtgpt_a
WTG Pitch Controller Model A
2nd
wtgtrq_a
WTG Torque Controller Model A
2nd
wt1p_b
Pitch Controller for type 1 WTG Model B
2nd
wt1g
Type 1 WTG generator model
1st
wt1t
Type 1 WTG turbine shaft model
1st
wt2g
Type 2 WTG generator model
1st
wt2e
Type 2 WTG variable external rotor resistance controller
1st
wt2t
Type 2 WTG turbine shaft model
1st
lhvrt
low/high voltage ride-through relay model
1st
lhfrt
low/high frequency ride-through relay model
1st
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The 2nd Generation RES Models
RES
Model Combination
Type 1 WTG
wt1g, wt1t, wt1p_b
Type 2 WTG
wt2g, wt2e, wt2t, wt1p_b
Type 3 WTG
regc_a, reec_a, repc_a, wtgt_a, wtgar_a,
wtgpt_a, wtgtrq_a
Type 4 WTG
regc_a, reec_a, repc_a (optional: wtgt_a)
PV plant
regc_a, reec_b (or reec_a), repc_a
BESS
regc_a, reec_c (optional: repc_a)
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The 2nd Generation RES Models
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The 2nd Generation RES Model:
WTG Type 1 and Type 2
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The 2nd Generation RES Model:
WTG Type 3
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The 2nd Generation RES Model:
WTG Type 4
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The 2nd Generation RES Model:
PV
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References
WECC 2nd Generation WTG Model Specifications:
https://www.wecc.biz/Reliability/WECC-Second-GenerationWind-Turbine-Models-012314.pdf
WECC PV Model Specifications:
https://www.wecc.biz/Reliability/WECC-Solar-PV-DynamicModel-Specification-September-2012.pdf
WECC PV Modeling Guide:
https://www.wecc.biz/Reliability/WECC%20Solar%20Plant%20Dyn
amic%20Modeling%20Guidelines.pdf
WECC WTG Modeling Guide:
https://www.wecc.biz/Reliability/WECC%20Wind%20Plant%20Dyn
amic%20Modeling%20Guidelines.pdf
Model User Guide for Generic Renewable Energy System Models:
http://www.epri.com/abstracts/Pages/ProductAbstract.aspx?Pro
ductId=000000003002006525
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