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GRID
Voltage Stability Assessment at the EMS
Jay Giri
i-PCGrid
San Francisco, March 26th, 2013
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EMS Overview – DSA Integration
Basecase
Division Load & Loss
Load (area) meas.
Status & Analog Data
Network Loss
Unit base point & transaction
schedules
Basecase Original or Rescheduled
Basecase
Harmful Contingencies
Load Forecast SCADA AGC
State Estimation
Contingency Analysis
Volt-Var Dispatch
Basecase Basecase
Short Circuit
Security Enhancement Constrained Dispatch
Contingency Planning
Preventive Action
DSATools CTG & RAS
e-terravision UI
VSAT TSAT SSAT
DSA UI DSA UI
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EMS Integration with Powertech DSATools - VSAT
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• Fully automatic − Auto-run in real time network sequence − One-click to run in the study mode
• Archiving − Auto-archiving insecure cases for further investigation − Periodic Archiving
• Display the computation results on EMS side − Brings up VSAT result viewer from the EMS displays − Processes results to issue alarms, update statistics
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DSATools VSAT installations worldwide
Total: 36+
North America: 20+
Plus at utilities in:
Australia, China, Egypt , Ireland, South Africa, Korea, UK, Saudi, Malaysia, Norway, NZ, Vietnam, Colombia, etc
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North American SynchroPhasor Initiative (NASPI) – DOE SGIG projects
“Better information supports better - and faster - decisions.”
DOE and NERC are working together closely with industry to enable wide area time-synchronized measurements that will enhance the reliability of the electric power grid through improved situational awareness and other applications
April 2007 March 2012
6 September 2012
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Emerging era of Holistic Grid Security Analysis
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Hybrid Approach to Voltage Stability Assessment
“Measurement-based” Voltage Stability identify potential problems: - Voltage Profile & Sensitivities - Reactive Reserves - Real-Time Voltage Instability Indicator (RVII):
Advanced indicators based on key properties associated with voltage collapse phenomenon
- “Model-based” Voltage Stability to evaluate: - MW/MVAR Margins - Weak network elements - Critical contingencies - Corrective Actions
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EMS & Online-DSA Applications
VSAT
CA
RAS
A Hybrid Approach to Voltage Stability Assessment An integrated “measurement-based” and “model-based “ approach
Real-Time Voltage Instability Indicator (RVII) Detect WHEN in danger! PMU measurements
Estimate equivalent parameters in real-time
PMUs Real-Time Voltage Instability Indicator (RVII)
Determine HOW to respond!
Bus Voltage (V) Equivalent Impedance (Zeq) Reactive Margin (Qmargin)
Predict Qmargin changes under “worst case” contingency.
Provide recommendations on corrective actions.
MEAS
UREM
ENT-B
ASED
MO
DEL-B
ASDE
D
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Dynamic limit
On-Line Voltage Stability Assessment Integrated “measurement-based” and “model-based” analysis
MW Margins are computed in real-time using “model-based” Voltage Stability Assessment Tools (VSAT). ⇒ identify proximity to voltage stability violation
Real-time P-V locus (and voltage sensitivities) based on PMU measurements. ⇒ monitor current operating condition
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San Ramon - Proof of Concept Facility Strategic Team: PG&E, ALSTOM, GE, Mississippi State University, Quanta Academic & Testing GeorgiaTech, OMICRON / RTDS / Virginia Tech., Washington State Univ.
SynchroPhasor Applications for the Control Center Multi-host Redundancy (ISD Link)
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RVII VSAT
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…
DSA-EMS Integration with e-terravision
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Situational Awareness VSAT and e-terravision
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VSAT- PV Curves
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Regional Reactive Reserves Where are the Vars ?
Select region of interest to identify available VAR resources
Detailed summary of existing resources within chosen region
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Measurement-based voltage stability monitoring: - Bus
- Corridor
- Load Center
Real-Time Voltage Instability Indicator (RVII)
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Bus
Corridor
Load Center
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RVII Engineering User Interface (UI)
Real-Time Trends
P-Q-V Curves
Alarm messages
Monitored ‘Corridors’ & ‘Buses’.
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Comprehensive Voltage Stability Alarms Linking WAMS “Wide-Area” Low Voltage Alarms to Operator Guides in EMS
WAMS Composite Alarms
WAMS indicate the simultaneous occurrence of Low Voltage over a broad region. AND
Operator Guides in EMS
Reactive Reserve Monitoring in EMS Decision making: Operator Guides (e.g. “Switch On Capacitor Banks”). Arm Special Protection Schemes
Reactive Reserve (MVAR) monitoring for user-defined areas in EMS.
Detect WHEN to Take Action... and HOW to Respond!
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WAMS: “Wide Area Monitoring System” The new heartbeat of the grid!
EMS
Dynamic Security Assessment - VSAT
State Estimation Contingency
Analysis
Offline Analysis
Modelling
Root Cause Analysis
Wide Area Controls
Post-Event
Generator & ISO Compliance
New Smart Grid Applications
Distribution
DMS Distributed Generation
Demand Response
Substation Automation
WAMS ‘the new heartbeat of the grid’
Local Controls
Synchrophasor Analytics - RVII
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Thank you!
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