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Real Time Applications Using Linear State Estimation Technology
(RTA/LSE)
Ken Martin Electric Power Group
[email protected] JSIS
May 30-31, 2019 Salt Lake City, UT
DOE/OE Transmission Reliability Program
Introduction
• Project: Real Time Applications Using Linear State Estimation Technology
– DOE Grant Award DE-OE0000849
• Primary recipient: Electric Power Group, LLC
• Project Partners (host site & cost share):
– Bonneville Power Administration
– New York Power Authority
• Added project host site
– Duke Energy
• Implement 3 applications to monitor power system
• Test with simulated and recorded data
• Demonstrate at host utilities
Project approach
Phasor
Data
Stream
Data:
Concentration,
Validation,
Alignment –
PDC and LSE
Real-time
Contingency
Analysis (RTCA)
Area angle stability
detection
Voltage corridor
stability detection
Operator
notification
REAL-TIME CONTINGENCY ANALYSIS (RTCA)
Methodology
• Uses a base case (power flow model) as input and updates the observable area using eLSE results
• Run all contingencies from a list using Power flow solution (FDLF/NR)
• Detect voltage & power flow limit violations
• Use full system model covering utility with surrounding connections
• Challenges – Base case may not match current system
– Obtaining accurate results with small number of PMU measurements
RTCA Results Visualization
Violations for Individual Contingencies
List of Contingencies Causing Violations
Trend of Historical RTCA Results
List of Recent
RTCA results
Menu – Options, Settings
Real-time Mode vs Manual Study Mode
VOLTAGE CORRIDOR STABILITY LIMIT MONITORING
Transmission Corridor VSI Index
• Uses PMU measurements of V & I at both ends of a transmission corridor to compute complex power
• Computes a stability index that is simply the voltage across the system divided by the load voltage
• Limits are set based on local limitations
• Technique will handle a transmission corridor with a network of lines and multiple input and output points
VSI configuration
Loading Malin Voltage VSI
1 Base Case (3807 MW) 514.8 kV 16.61
2 4353 MW 504.8 kV 19.11
3 4667 MW 493.7 kV 21.21
4 4917 MW 480.2 kV 23.38
5 5125 MW 472.5 kV 24.87
6 5150 MW 471.5 kV 25.03
7 5160 MW 466.6 kV 25.93
8 5205 MW NA Diverges
Alarm levels were determined: • Alert: 19
• Alarm: 23
• Establish VSI limits based on various severe contingencies
• For BPA, used maximum generator & DC intertie – Example - Loss of Two Palo Verde Units
VSI Visualization in Real-Time (Loss of 2 Palo Verde Units with 4667 MW initial loading on corridor)
VSI Plot
Alarm color-coded VSI
visualization on map
Corridor Bus Voltages Corridor Power Flows
Alarm Threshold
VSI Exceeds
Alarm Threshold
AREA ANGLE LIMIT MONITORING
Area Angle Monitoring (AAM) – Overview
• Power flow creates a phase angle. Higher angles result from – Higher power flow
– Higher impedance (fewer lines carrying flow)
• High Angle can indicate excessive stress or a lost transmission line
Power
flow into
an area
Power
flow out
of an area
Calculation of Area Angle
Area angle calculation
An area with border buses
Weights of border buses are
calculated with Kron
reduction
• Select an area with a through power flow & PMU measurement on boundary busses
• Determine a weighting for each boundary bus based on the network admittances
• Study outages to relate area angle to relate area angle to allowable power flow through the area
Visualization of AAM On RTDMS Client
• Monitor an area in BPA
• Contingency: Loss of John day–Grizzly #1 and #2 and the line Grizzly–Malin
Alarm color-coded AAM
visualization on map
Area angle curve
Emergency threshold
Warning threshold
23.50 degree
21.29 degree
Applications Benefits
• RTCA Improves Situational Awareness & provides Actionable Intelligence – Based on eLSE which always solves
• Provides Backup to Conventional RTCA • VSI covers transmission corridors rather than
specific lines – Covers less well defined transmission flows
• Area angle can detect weakness in the bulk grid – Does not depend on individual flow measurements – Other measurement techniques do not provide angle
• Both applications back up existing flow and stability indices
• Application developments are complete
• Prototype demonstration was made to DOE and project participants in Feb 2019
• BPA implementation complete in June 2019
– Factory tests (FAT) in May & installation in June
– Site tests (SAT) after on-site tuning
• Implementation for NYPA under way
– Implementation for Duke to follow
Project status
Looking Forward
• Activities through FY 2019
– Complete adaptation for NYPA and Duke
– Perform FAT tests for both
– Deploy at host sites & SAT tests
– Monitor operation & improve operation as needed
• FY 2020:
– Monitor and improve applications
– Final project report
– Produce commercialization plan
Thank You!
Reserve
• Delete at end
Advisors & observers
• Project Advisors – Anjan Bose – Washington State University – Ian Dobson – Iowa State University – Dejan Sobajic – Grid Engineering – Anurag Srivastava – Washington State University
• Project Observers – Dominion Virginia Power (Dominion) - Kyle Thomas – Peak Reliability - Hongming Zhang – PJM - Emanuel Bernabeu, Ryan Nice
Project Objective
• Develop Real Time Applications Using Phasor Data and Linear State Estimator Technology
– Provide operators with actionable intelligence on contingencies, voltage margins, & phase angle limits
• Applications include
– Real Time Contingency Analysis
– Voltage Stability Monitoring
– Area Angle Limit Monitoring
4-13-2017
Project Timeline Task Deliverable Completion Date Documentation & notes
1 Project Management Plan 4/12/2017 Project management plan document
2 Research, Design & Development of Prototype
2.1 RTA/LSE Design & enhanced
LSE implementation
7/28/2017 Design specification document
2.2 Offline study 9/6/2017 Offline study report
2.3 Real time applications
prototype, and development
and testing
1/29/2019 Test cases and test results
2.4 Prototype Demonstration for
DoE and all the participants
3/31/2019 Demonstration at EPG
3 Deployment, Testing & Acceptance
3.1 Factory Acceptance Tests 7/24/2019 Test cases and test results
3.2 Site Acceptance Tests 10/15/2019 Test cases and test results
4 Demonstration at utility host
site, training and a report
12/20/2019 Demonstration, training and report
5 Marketing and Outreach
5.1 Marketing Plan 2/1/2020 Marketing plan
5.2 Outreach 3/14/2020 Industry presentations and briefing documents
RTCA - Overview
• Real-time Contingency Analysis - Application performs Contingency Analysis using PMU Data and enhanced Linear State Estimation (eLSE)
• Study what-if Contingency Scenarios to assess System Violations
• Contingencies Include – Loss of Lines, Transformers, Generators (N-1, N-2, N-k) etc.
RTCA Benefits
• High-level view of risks and potential severe problems – Contingencies Causing Violations & List Violations by
Category
– Detailed Results for each contingency
• Offers Real-time and Manual study Modes
• Improves Situational Awareness & provides Actionable Intelligence
• Based on eLSE which always solves
• Provides Backup to Conventional RTCA