MVWG Report to TSS
August 2014
Stephanie Lu, MVWG Chair
Seattle City Light
Recent Meetings
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REMTF Workshop June 17, 2014
MVWG Meeting June 18-19, 2014
Webinar Training on Frequency Response
Validation Tool July 22, 2014
MVWG Conference Call August 12, 2014
May 16 2014 Event Validation Report
PPMDTF Conference Call August 15, 2014
MVWG Activities Overview
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Approved Documents
Renewable Energy Modeling
System Model Validation
Generator Modeling, Testing, and Validation
RAS & Relay Modeling
Status Update of Models
Load Modeling
HVDC Modeling
Other items: NERC Updates, WECC Project Updates,
Program Updates
Next Meetings and Workshops
MVWG Approved Documents
For TSS Information:
 Update to the Approved Dynamics Model List
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Update to the Typical Machine Data document
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Added wt1p_b (part of the 2nd generation wind models)
Replaced 1st generation wind models with 2nd generation wind
models (see modeling guidelines)
Added PV models (see modeling guidelines)
Minor improvements to the hydro model section
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Added accel parameter in gentpj model
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Changed the ks2 parameter in pss2a model to be Tw2/(2H)
Approved May 16 2014 Event Validation Report
Current Differential Relay Model Specifications were
approved, but some abstained
Renewable Energy Modeling
Wind/Solar Implementation Plan
2nd Generation Wind Models
2nd Generation Wind Models
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SRWG Implementation Plan – Complete transition by
6/5/2015
Superseded models will be removed from Approved
Dynamics Model List on 6/5/2015
Exception: REMTF recommended removing wt1p and
wt2p from the WECC Approved Model List immediately
Passive units should not have a pitch control model
Active stall units should use wt1p_b
REMTF will take the action to inspect the list and give
the recommendation of either deleting or replacing the
wt1p and wt2p with wt1p_b
Photovoltaic Models
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For large-scale PV plants:
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For distributed and small PV plants, use PVD1 model
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SRWG Implementation Plan to be completed by
6/5/2015
REMTF – Next Steps
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Wind Type 3 torque controller model – reviewing a
proposal to keep the more complex model as a separate
module
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Distributed PV model in composite load model
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More discussion is needed between REMTF, program vendors
and LMTF to implement a distributed PV model in the composite
load model CMPLDW
REMTF – Next Steps (cont.)
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Energy Storage Modeling
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Plant Level Control Modeling
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Progress report expected Nov 2014
Members requested a more expedited schedule because
interconnection requests of batteries are being received
Encourage manufacturers to get engaged early in the model
development
Expand plant control model to control multiple elements,
including different types of wind turbines, SVCs or STATCOMs,
and MSCs
Investigate whether SVSMO3 can model hybrid SVC
(contains both VSC and TSC)
System Model Validation
System Model Validation
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MVWG is continuing to improve the process to develop
future model validation cases
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Method 1: Planning base case and dyd
Method 2: Using WSM case and dyd (PSLF v19)
Event Model Validation Efforts:
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May 16 2014 NW RAS Event – Completed
May 26 2014 DC RAS Event – In progress
Planning Case & DYD
WSM Case & DYD
May 16 2014 NW AC RAS Event
Validation Report
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MVWG approved the “Model Validation Report for May
16, 2014 RAS Event”
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Posted on website:
WECC MVWG > Documents > Approved Documents
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Includes simulations using both methods
(Planning and WSM case)
May 16 2014 NW AC RAS Event
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Pre-contingency: John Day-Grizzly #2 and
Grizzly-Malin #2 500-kV lines were out of
service
At 23:18:15:
Kemano RAS
 John Day-Grizzly #1 500-kV line tripped
3
to lock-out
 AC RAS gen.drop is initiated of about
2,500 MW at Grand Coulee, Wells, John
2 RAS Gen.Drop
Day, Biglow Canyon Wind and Dooley
and Chief
Wind
John Day-Grizzly1 Joseph Brake
 Chief Joseph braking resistor is
operated
Few seconds later: Kemano RAS in BC
operated and tripped unit # 1 with 110 MW
40 seconds later: Springerville unit #4 in
Arizona tripped with ~425 MW due to boiler
4 Springerville #4
instability
23:20:30: John Day-Grizzly #1 500-kV line
is restored back to service
May 16 2014 NW AC RAS Event
Frequency
60.05
60
NW RAS = 2,563 MW
John Day – Grizzly #1
back in service
59.95
Kemano = 110 MW
59.9
59.85
Springerville = 445 MW
59.8
59.75
59.7
23:18:00 23:18:15 23:18:30 23:18:45 23:19:00 23:19:15 23:19:30 23:19:45 23:20:00 23:20:15 23:20:30 23:20:45
May 16 2014 NW AC RAS Event
Simulated versus Actual
Malin Frequency
60.1
Actual
Simulated
60.05
60
Frequency (Hz)
Frequency (Hz)
Actual
Simulated
60.05
60
59.95
59.9
59.85
59.95
59.9
59.85
59.8
59.8
59.75
59.75
59.7
0
10
20
30
40
Time (sec)
50
60
70
59.7
80
0
10
20
Custer Frequency
40
Time (sec)
50
60
70
80
60.1
Actual
Simulated
60.05
Actual
Simulated
60.05
60
Frequency (Hz)
60
Frequency (Hz)
30
Sylmar Frequency
60.1
59.95
59.9
59.85
59.95
59.9
59.85
59.8
59.8
59.75
59.75
59.7
Grand Coulee Frequency
60.1
0
10
20
30
40
Time (sec)
50
60
70
80
59.7
0
10
20
30
40
Time (sec)
Remarkable agreement of frequency response
50
60
70
80
May 16 2014 NW AC RAS Event
WSM Simulation versus Actual
May 16 2014 NW AC RAS Event
Validation Report
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Simulations matched actual recordings quite well
Above NERC BAL-003-1 Frequency Response Obligation
Recommendations:
 Validate Generator Frequency Modeling
 Use tools available to validate frequency response and baseload flag
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Expedite reconciliation of wind models in WSM and Planning cases
 Reconcile wind modeling
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Model wind in dyd (many wind plants do not have dynamic models)
 Use 2nd generation wind models
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Model Kemano RAS, Review Kemano RAS, and install PMUs
 BC Hydro to address recommendations
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Chief Joseph Brake Modeling
 BPA to review security of Chief Joseph Braking Resistor, and provide model
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Springerville owners to resolve issues with unit #4 trip
Generator Modeling, Testing,
and Model Validation
Frequency Response Tool
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BPA Generator Frequency Response Tool is
available (uses PI data)
Frequency Response Tool
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Eric Bakie (IPCO) presented an improved PI Data
Generator Frequency Response Model Validation Tool
(version 1)
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Incorporates PI data tool
Incorporates PPMV tool for model validation
Includes batch processing, for multiple units and multiple events
Includes overview presentation and detailed user guide
Webinar training was provided July 22, 2014
Good for unit level model validation
This approach works for governor model validation
Good tool for identifying undesired control behavior
Frequency Response Tool
Frequency Response Tool
Frequency Response Tool
Recent Disturbance Events
As presented at the last meeting:
 Jan 29, 2014 @ 6:47:06 PT – Freq dropped to 59.75 Hz
 Jan 29, 2014 @ 7:03:58 PT – Freq dropped to 59.78 Hz
 Feb 2, 2014 @ 11:29:32 PT – Freq dropped to 59.87 Hz
 Feb 21, 2014 @ 10:14:16 PT – Freq dropped to 59.88 Hz
 Apr 9, 2014 @ 17:33 PT
– Freq dropped to 59.92 Hz
 Apr 15, 2014 @ 05:46:00 PT – Freq dropped to 59.89 Hz
 Apr 15, 2014 @ 14:43:10 PT – Freq dropped to 59.85 Hz
 Apr 17, 2014 @ 16:21:03 PT – Freq dropped to 59.89 Hz
 Apr 21, 2014 @ 10:41:43 PT – Freq dropped to 59.87 Hz
 Apr 29, 2014 @ 05:23:28 PT – Freq dropped to 59.89 Hz
Recent Disturbance Events
Events since the last meeting:
 May 16, 2014 @ 23:18:20 PT – Freq dropped to 59.73 Hz **
[NW AC RAS Event]
 May 26, 2014 @ 12:31:57 PT – Freq dropped to 59.81 Hz
 May 26, 2014 @ 17:32:01 PT – Freq dropped to 59.66 Hz **
[DC RAS Event]
 June 6, 2014 @ 3:37:41 PT
– Freq dropped to 59.88 Hz
 June 12, 2014 @ 18:07:55 PT – Freq dropped to 59.83 Hz
[BCH RAS and Alberta Separation Event]
 June 14, 2014 @ 11:22:14 PT – Freq dropped to 59.90 Hz
 July 4, 2014 @ 3:14:33 PT
– Freq dropped to 59.90 Hz
**MVWG is performing system model validation for the May 16th (completed)
and May 26th events.
Power Plant Model Data Task Force
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Adding PC and TP for each item to spreadsheet with list of
suspected errors
PLEASE REVIEW LIST AND ADDRESS ITEMS IN YOUR
AREA
Modeling Data standard MOD-032-1 (steady-state,
dynamics, short circuit)
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BA, GO, LSE, RP, TO, TSP must respond to PC or TP if they
provide technical concerns with the data submitted (effective
7/1/2016)
Verification standards MOD-026-1 (Excitation Systems)
and MOD-027-1 (Turbine/Governor)
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GO must respond to TP within 90 days if TP notifies GO that
model is not usable, provides technical concerns with the
verification documentation, or provides evidence that the model did
not match the recorded response to an event (effective 7/1/2014)
Power Plant Model Data Task Force
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MVWG will work with SRWG to incorporate additional
data checks into the base case review process
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Turbine type (ensure this is being populated)
Baseload flag (review/verify that flag is populated and correct)
Pmax (powerflow) should be less than mwcap (dynamics)
Wind models (see SRWG implementation plan)
If there are additional errors suspected, continue to send
them to Kent
Excitation Models
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Eric Bakie (IPCO) showed that not modeling UEL
impacts simulations
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IEEE Standard 421.5 on excitation models is close to
going out for ballot
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UEL1 and UEL2 have been recommended to be higher in priority
for program implementation
More discussion will be needed to determine which model(s)
WECC will recommend to be the approved
Currently OEL1 is WECC approved
RAS & Relay Modeling
Relay Modeling Discussion
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Current Differential Relay Model Specifications were
approved, but some abstained
“There is no or little value of deploying the current
differential relay and distance relay throughout the
system.”
“It is good to make these models available in the
software packages; however the need, cost, value, and
increased database management, etc. for adding data
collection requirements for all the new relay models to
the WECC DPM have not fully been identified.”
More discussion is described in the MVWG Report to
TSS
Status Update of Models
Status of Model Development
Status Update of WECC Models document is posted on website
Model Description
Model Name
Composite load model
1st generation wind
Over excitation model
SVS models
Generator model
Overcurrent relay model
Volt and freq ride through
Hydro turbine governor model
2nd gen wind/1st gen PV
Distributed PV model
Directional Overcurrent relay
Distance relay model
Differential relay model *NEW*
Under excitation relays
CMPLDW
WTxx models
OEL1
SVSMO1, 2, 3
GENTPJ
LOCTI & TIOCRS
LHVRT, LHFRT
H6B
RExx and WTGxx models
PVD1
TIOCRS (revision)
DISTRELAY
DIFFRLYG and DIFFRLYS
UEL1 & UEL2
Excitation system models
Composite load model with DG
Colstrip ATR
Generator protection
Other
See IEEE 421.5 efforts
Under development
Under development (NWE)
Under development (MSRATF)
See Approved Dynamics List
Model Spec
Approved?
Need to post
X
PSLF Manual
X
X
X
X
X
X
X
X
X
IEEE 421.5
(2005)
User Guide
WECC
Available?
Approved?
X
X
X
X
X
X
X
X
See Model Spec
X
X
X
X
X
X
X
See Model Spec
See Model Spec
See Model Spec
-
X
Status of Model Development
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Added NOTE: RAS Common Format has been
developed by TSS and has been implemented in
PowerWorld and will be implemented in PSLF and
PSSE. MATL and Bridger will be implemented using the
common format.
Load Modeling
Load Modeling – Composite Load
Model Data Tools
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Tools available on the TSS Base Cases website
in the Composite Load Model Tools folder
 Load
Model Data Tool LMDT4A
“2012 WECC CMPLDW.zip”
 Updated Load Composition Data
“CMPLDW Load Composition Data_032514.zip”
 PNNL Tool to create PSSE dyr format
“LMDT_install.zip”
Load Modeling –CMPLDW
Phase 2 Update
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Results may be pessimistic due to point on wave
sensitivity
SCE has installed PQube devices on distribution circuits
BPA has installed microPMUs on distribution circuits
LBNL is providing PQube devices to those who will
install them and share the data
Renewed interest in residential and commercial building
load composition
Load Modeling – CMPLDW
Monitoring Improvements
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Specifications are being written to add these capabilities:
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Requesting to add the ability to monitor load lost in CMPLDW
models per area, zone, or owner so that we can track how much
aggregated load is being shed
Request that otg-d format is compatible for both motorw and
cmpldw models (otherwise you need to update the otg-d file with
the new bus number for the cmpldw)
Request not to change the bus monitoring variable name so that
it stays compatible with WCA analysis tools
Load Modeling – Voltage Dip
Criteria
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Chuck Matthews (BPA), chair of WECC-0100 project,
provided an update
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Discussing transient voltage performance, voltage stability
criteria, steady state voltage limits and post contingency
voltage deviations
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Discussed whether the criteria should be a RBP or a guideline
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Chuck indicated that the project may need input from M&VWG on the
transient voltage performance criteria
The majority of the project members prefer guideline
TPL-001-WECC-CRT-2.1 retirement on 12/31/2015
HVDC Modeling
HVDC Modeling
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Multi-terminal conventional HVDC powerflow
model – exists
Multi-terminal VSC HVDC powerflow model –
now in beta version and being tested
Conventional HVDC dynamic model - in
progress
VSC HVDC dynamic model - in progress
HVDC Modeling
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Ongoing Issues
 Trans
Bay DC model still needs to be validated
 PDCI Modeling
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Sylmar model still needs to be validated
Celilo is expected to be replaced in 2016, the updated model
is in progress
Other Items
Other Items
NERC Updates
 WECC Project Updates
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Program Updates – PSLF, PSSE, and
PowerWorld
NERC Updates
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Eric Allen (NERC) provided updates on NERC MWG
activities:
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Benefit analysis for node-breaker representation in off-line and
real-time study models
Model validation field trial
SW outage recommendations 5, 6, 7, & NERC2 on Seasonal
Assessment and sub-100 kV elements
Standardized component models
More information available in NERC PC June 2014 Meeting Minutes
WECC Project Updates
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WECC-0101 SAR Gen Validation Policy
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Drafting team chaired by Shawn Patterson USBR
Comments received on draft variance was mixed
Another draft is expected to incorporate comments:
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Apply to BES generators
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Address re-testing period (5 vs 10 years)
WECC-0107 PSS Design and Performance
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Drafting team formed (consists of Control Work Group), chaired
by Martin Bauer USBR
The drafting team is taking most of the existing PSS
requirements and putting it into a standard, but applicability is
proposed to be changed to BES definition
Next Meetings & Workshops
Next Meetings & Workshops
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November 18-20 in Albuquerque NM, hosted by Sandia
National Laboratories
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REMTF Meeting -- Nov 18th afternoon & Nov 19th morning
LMTF Meeting -- Nov 19th morning
MVWG Meeting -- Nov 19th afternoon & Nov 20th all day
LMTF, HVDCTF and PPMDTF will meet independently
from the main M&VWG meeting.
Questions ?
“Dmitry has proven himself a major
“Not only is Dmitry an expert in his field, but he technical contributor at WECC”
has also demonstrated a leadership role as he
shares his knowledge with those around him”
As MVWG LMTF Chair, “led the development
of the recently implemented WECC composite
load model”
As JSIS Chair, “led the
development and implementation
of WECC’s oscillation analysis
tools that were deployed last year”
“he created disturbance base cases to
validate the system model and generator
models, leading to recommendations for
model improvements”