TTC Calculator Project
Ebrahim Vaahedi
Feb 4, 2011
 Background
 Project Objective Motivation
 TTC Calculation
● Near Real-time
● Pre-Scheduling
 Transmission Reliability Margin
 Project Plan
How Do We Interconnect?
Path 1 (AESO intertie) consists
of 5L94, 1L274 & 1L275
Path 3 (BPAT intertie) consists of
5L51/52, 2L112 and TeckCominco 71L
There are quite a few paths for
which ATC is posted but the
Path to the US and Alberta are
the most important (e.g. BCHFBC, BCH LM to BPA)
TTC Calculation Processes
1. Hour Ahead TTC (for 12 hours updated hourly)
2. Hourly Calculations (for 168 hours updated
daily)
3. Daily Calculations (for 30 days updated daily)
4. Weekly Calculations (for 52 weeks updated
weekly)
5. TRM Calculation
TTC Calculator Program
Establishing and Setting TTC Limits With BPA& AESO
BPA TRM
50 MW (both directions)
AESO TRM 65 MW (both directions)
Project Objective & Motivation
Objective
• Define, design and develop a more accurate TTC
Calculator
• Involves Technology, Process and People
Benefits
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Increased Benefit
Reduced Risk
Increased Efficiency
Improved Sustainment and sustainability
TTC Calculation Old Method Vs. New Method
2 Million Off-line
Voltage Stability Studies
TRM using
Historic
Interchange
Errors
One Online Voltage
Stability Study Per
TTC
Pattern Matching Program
Voltage Stability Results
TSAPM
Combine VSA &TSA
TSAPM
to be Superseded by
Online TSA
Combine VSA &TSA
TRM using
Probabilistic
Methodology
Online TTC Project
– Phase 1: Definition (Completed, March 2009)
• Define the requirements
• Design the technology solution
• Conduct a revised assessment for cost & schdule
–
Phase 2: Implementation (Started April 2010)
• To develop and implement the solution in real-time
and pre-scheduling
• To conduct user’s training and sustainment transition.
Project Schedule
• Completion Date: Sep 2010
• Detailed Design: February 2011
• Contract Negotiation March 2011
Tasks
Project Management
Detailed Functional Design
Architecture Design
Hardware Implementation
Implementation, Basecase
Developer
Implementation, TTC
Implementation, TRM
System Integration
Testing
Software Changes
Testing
Software changes
Real-time Implementation
Final Testing
Training
Transition to Maintenance
Documentation
Apr- May- JunAug- Sep- Oct- Nov- Dec- Jan- Feb- Mar- Apr- May- JunAug- Sep- Oct- Nov- Dec- Jan- Feb- Mar- Apr- May- JunAug- Sep10
10
10 Jul-10
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11 Jul-11
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12 Jul-12
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Achievements So Far- Procurement Strategy
• Instead of dealing with a number
of parties try to have one outfit do
the project
• Since the solution was to use
Areva’s EMS environment, it was
decided to have Areva provide a
budgetary estimate with no
obligations
• Areva did provide a budgetary
estimate
Areva is now called
Alstom T&D
Achievements So Far- Alstom’s Budgetary Estimate
• Budgetary estimate was high considering that it did not include a
number of items
• Met with Alstom on August 31 to discuss, Proposal, Price, Baselining and Governance
• Discussion Summary
– BC Hydro should manage both Alstom and Powertech
– BC Hydro to perform use case studies to come up with a more
detailed requirement document for sharper estimates
– Alstom is prepared to baseline the solution except for the TRM
– TRM development expensive
• BC Hydro has been developing the detailed requirements
• Alternative design with TRM calculations outside the tool
Wrap-up
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•
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•
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A new TTC is under development
A number of Processes have been streamlined
Detailed Requirement under development
A study is being conducted to revise the TRM values
Contract negotiation to start in March