Team Members: Kyle Jones Mark Magee Jason Rippee Borah Mitigators Remedial Action Scheme for the Borah West Path Sponsored by: IDAHO POWER Team Members: Kyle Jones Mark Magee Jason Rippee

Project Background Idaho Power wants to add to a remedial action scheme for the Borah West Path To include the impact of ambient temperature changes to the system Maximize the power flow utilizing thermal capability

Deliverables Simulation of the modified scheme in PowerWorld 11 Provide a set of mitigation options to increase transfer capability

Needs Analysis Due to the growth of Boise, the load flow is increasing along the path The Borah West Path has elements that reach their thermal limit following the loss of critical transmission lines Compensating for thermal effects will increase the load carrying capacity in lines

Cost Analysis Investments/Costs Hours Total Dollars per Week Weeks per Hour Item Cost Student Time 15 26 390 $50.00 $19,500.00 Faculty Time 2 52 $150.00 $7,800.00 Laboratory Facility 10 4 40 $25.00 $1,000.00 PowerWorld Simulator $12,000.00 IEEE 738-1993 $143.35 Poster Board $14.69 Poster Photo   $45.00 Projected Total Cost: $40,503.04

Insights to the Problem The first slide demonstrates the current limit conditions The second slide gives a flow chart of what remedial action is to be taken The third slide is a graphical depiction of the flow chart

Midpoint East flow, MW (pre-disturbance) Calculated Borah West limits Midpoint East flow, MW (pre-disturbance) ( Summer time - 2005) W/ 1 unit trip = A = 1929 - 6.64*degC + 0.45 * 1st unit MW where Ta = actual ambient temperature in deg C 1st Bridger Unit to trip (MW) W/ 1 unit trip &bypass both series caps = Ac = 1293 -3.93*degC + 0.2384 * 1st unit MW + 0.484 * Midpoint East flow (MW) 2nd Bridger Unit to trip (MW) W/ 1 unit trip &bypass 1 series cap = AC/2 = A + (Ac-A)/2 W/ 2 unit trips = B =1929 – 6.64*degC +0.45 * (1st + 2nd unit MW) W/ 2 unit trip & bypass both series caps = Bc = 1293 – 3.93*degC + 0.2384 * (1st + 2nd unit MW) +0.484*Midpoint East flow (MW) W/ 2 unit trip &bypass 1 series cap = BC/2 = B + (Bc-B)/2

Is Midpoint East scheme will trip 1 Bridger Unit Bypass Burns Series Capacitor Critical Outage has occurred: Kinport – Midpoint and Borah – Adelaide – Midpoint #1 or #2 345kV lines Is AC/ 2 > A ? Is BW > ~1100MW Is BW > A yes yes yes no no no Is BW > A yes No action taken X33 No action taken No action taken no No action taken Trip 2nd Unit @ Bridger Bypass Midpoint Series Capacitor Initiate Bridger Redispatch or / and load curtailment to eliminate overloads on remaining Borah – Adelaide – Midpoint 345kV line and AMFLS – Adelaide and AMFLS – Plst Valley 138kV lines X33 Is BW > AC/ 2 Is BW > AC Is BW > BC yes yes yes no no no No action taken No action taken No action taken

Constraints Keep voltage deviation after one line loss below 5% of nominal operating voltage, and below 10% for a two line loss. Under normal conditions conductor temperatures should not exceed 80 degrees Celsius. Outage conditions should not exceed 90 degrees Celsius for more than 15 minutes.

Constraints 2 In order of importance: 1) Avoid tripping Generators at all costs! ( lots of money) 2) Avoid dropping loads. 3) Avoid shorting series capacitors (not that big of deal). Utilize thermal capabilities if possible.

Schedule

Fall Schedule

Project Learning IEEE standard publication 738-1993 PowerWorld Manual ETAP Software Series Capacitors Load Shedding Generator Dropping

اIا2*Rac+qs=qc+qr اIا, is the magnitude of maximum current (ampacity) Rac, is the ac resistance of the conductor qs, is the head absorbed by the sun qr, is the radiated heat of the conductor qc, is the convected heat of the conductor

Questions?

Our Questions Are violations outside of Idaho our concern? What are the required deliverables and what are optional? For thermal modeling do we use limit groups or can we scale all ampacities by a factor? How do we approach weather conditions? Do you want to increase transfer levels from the base case? Do we need the ATC PowerWorld add-on?

Limit Group Factors