Oncor Electric Delivery Company LLC Smart Grid Demonstration Project – Dynamic Line Rating (DLR) June 25, 2010 Justin Johnson ERCOT Reliability Operations Subcommittee Meeting
Dec 27, 2015
Oncor Electric Delivery Company LLC
Smart Grid Demonstration Project – Dynamic Line Rating (DLR)
June 25, 2010Justin JohnsonERCOTReliability Operations Subcommittee Meeting
Justin Johnson ERCOT ROS Presentation 06/25/2010 3Oncor Electric Delivery Company LLC
Dynamic Line Rating
Transmission Line Ratings are governed by:
Current flowing in the conductor
Conductor size and resistance
Ambient weather conditions:
– Temperature
– Wind speed and direction
– Solar radiation
Justin Johnson ERCOT ROS Presentation 06/25/2010 4Oncor Electric Delivery Company LLC
Ambient Temperature:
– 2oC fluctuation +/- 2% capacity,
– 10oC drop in ambient + 11% capacity
Solar Radiation:
– Cloud shadowing +/- a few percent,
– Total eclipse + 18% capacity
Wind increase 1 m/sec:
– 45° angle ~ 18% capacity
– 90° angle ~ 23%capacity
How Weather Conditions Affect Ratings (Illustrative Only)
Justin Johnson ERCOT ROS Presentation 06/25/2010 5Oncor Electric Delivery Company LLC
What to Monitor?
Dead-end Dead-end
Suspension Suspension Suspension
Tension increases in spans cooled by wind,
and decreases in spans not cooled by wind…..
Justin Johnson ERCOT ROS Presentation 06/25/2010 6Oncor Electric Delivery Company LLC
Tension Monitoring - Dynamic Line Rating
Tension Equalizes
Suspension insulator strings swing to equalize horizontal conductor tension
Monitoring the conductor’s tension solves the problem of varying winds and exposure along the transmission line.
A conductor’s tension is directly related to the average temperature of all the spans in the line section.
That temperature is directly correlated to the conductor sag and clearances.
Dead-end Dead-end
Suspension Suspension Suspension
Justin Johnson ERCOT ROS Presentation 06/25/2010 7Oncor Electric Delivery Company LLC
Know true line capacity in real time
Improve system reliability
Optimize grid utilization
Dynamic Line Rating Concepts (Illustrative Only)
Dynamic Line RatingDesign Isotherm
Justin Johnson ERCOT ROS Presentation 06/25/2010 8Oncor Electric Delivery Company LLC
Line was operating within limits in accordance with operating standards
Without DLR, this event must be reported as a violation
The operator would have been forced to move the grid off its optimum dispatch
Dynamic Rating
Actual Load
Static Rating
Impact On Transmission Grid OperationsExample Of Safely Managed Contingency
Justin Johnson ERCOT ROS Presentation 06/25/2010 9Oncor Electric Delivery Company LLC
LOCATION OF INSTRUMENTED CIRCUITS
Study Area in Critical Congestion Zone
45 Loadcell Tension Monitoring Units
8 Master Locations Feeding into SCADA
Justin Johnson ERCOT ROS Presentation 06/25/2010 10Oncor Electric Delivery Company LLC
DLR Smart Grid Demonstration
Project Goal: Increase available capacity on a known congested and constrained transmission path and remove existing commercial constraints to implementing DLR technology
Existing Commercial Constraints Include:
• Clear Demonstration that DLR Technology is Reliable
• Utility Planners Understand the Cost Structure and Benefits
• Interoperability with Utility Transmission Management Systems
Justin Johnson ERCOT ROS Presentation 06/25/2010 11Oncor Electric Delivery Company LLC
PROJECT OBJECTIVES
Operational Objectives
Relieve congestion and transmission constraints
Gain operational knowledge of DLRs for wide scale deployment
Ensure that safety code clearances are not impacted
Demonstrate that multiple monitoring units can be integrated into operations
Identify/quantify other operational limits that may impact ability to raise ratings
Justin Johnson ERCOT ROS Presentation 06/25/2010 12Oncor Electric Delivery Company LLC
PROJECT OBJECTIVES
Demonstration Objectives
Extrapolate the impact of DLRs on the study’s transfer path to entire ERCOT region
Determine a methodology to release day-ahead ratings
Develop user friendly tools for the operator to manage improved WASA
Justin Johnson ERCOT ROS Presentation 06/25/2010 13Oncor Electric Delivery Company LLC
PROJECT OBJECTIVES
Economic Objectives
Quantify economic value of released transmission capacity to market
Estimate the savings associated with deferral of rebuilding, reconductoring, or building new circuits
Quantify the total costs of implementing this type of DLR
Justin Johnson ERCOT ROS Presentation 06/25/2010 14Oncor Electric Delivery Company LLC
Integrated Dynamic Line Rating Systems
• Tension-based Dynamic Line Rating System for overhead transmission lines
• Tension resolves all environmental factors for accurate results
• Best way to capture spatial variability of wind, sun, air temperature
• Captures as built, as aged condition of line
• Communicates with utility’s Energy Management System
Justin Johnson ERCOT ROS Presentation 06/25/2010 15Oncor Electric Delivery Company LLC
Solid stainless steel construction.
Sized to match maximum tension
Real Time Rating - Loadcell Monitors Tension
Justin Johnson ERCOT ROS Presentation 06/25/2010 16Oncor Electric Delivery Company LLC
Real Time Rating – Communications Package
Reads conductor tension, net radiation temperature, ambient temperature
Communicates with substation via spread spectrum radio
Solar powered
Justin Johnson ERCOT ROS Presentation 06/25/2010 17Oncor Electric Delivery Company LLC
Integrated Dynamic Line Rating Systems
SCADA/EMS Master
Existing SCADA protocol
over substation RTU channel
(RS232/485)
License free
Spread Spectrum Radio
IntelliCATTM
for Windows
ICCP or MODBUS protocol
CAT-1™ and line load data from EMS
Substation
Control Center
Transmission Line
Operator’s Console’
CAT-1TM Remote Monitors
CATMasterTM
Base Station
Line capacity and temperature to EMS
Justin Johnson ERCOT ROS Presentation 06/25/2010 18Oncor Electric Delivery Company LLC
MAJOR PARTICIPANTS
• Oncor
Purchase DLR equipment and manage project
• The Valley Group, a Nexans company
Provide DLR equipment
• Siemens Energy, Inc.
Integrate DLR technology into Oncor’s TMS system
• Chapman Construction Company
Install equipment on designated circuits
• Southwest Research Institute
Perform independent analysis
Justin Johnson ERCOT ROS Presentation 06/25/2010 19Oncor Electric Delivery Company LLC
Initial Device Installation
PROJECT TIMELINE
2010
Qtr 1
2011 2012 2013
Qtr 2 Qtr 3 Qtr 4 Qtr 1 Qtr 2 Qtr 3 Qtr 4 Qtr 1 Qtr 2 Qtr 3 Qtr 4 Qtr 1 Qtr 2 Qtr 3 Qtr 4
Design/Initial Procurement
Fine-tune Initial Device Output
Terminal Upgrades
Remaining Device
InstallationFinal Report Submitted to
DOE
Project Studies
Reporting (Quarterly to
DOE)
Justin Johnson ERCOT ROS Presentation 06/25/2010 20Oncor Electric Delivery Company LLC
Summary
• Target Completion is 2nd Quarter 2013
• Provides two years of summer peak data
• Will provide a “roadmap” for other utilities to follow - study will be public
• Success Factors include increasing transmission capacity and removing existing commercial constraints to DLR technology
• All eight circuits should be instrumented by end of this year