1 / 16

Heywood Road Project & MPRP Section 83 Sensitivity Analysis

Heywood Road Project & MPRP Section 83 Sensitivity Analysis. ISO-New England Planning Advisory Committee November 19, 2008. Heywood & MPRP Sensitivity Analysis. Issue

carlo
Download Presentation

Heywood Road Project & MPRP Section 83 Sensitivity Analysis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Heywood Road Project & MPRPSection 83 Sensitivity Analysis ISO-New England Planning Advisory Committee November 19, 2008

  2. Heywood & MPRP Sensitivity Analysis Issue Heywood Road (formerly Benton) Project (PPA CMP-06-T13) includes an increase of the sag-limited rating of Section 83 between Wyman Hydro & Section 83C tap Detailed design [using Light Distance And Ranging (LiDAR) data] has indicated that re-rating is expensive, nearly $10 million A new 115 kV line parallel to Section 83 between Wyman Hydro and the Section 241 (Rice Rips) tap would be $19.6 million – there is room on the existing Right-of-Way (ROW) for a new line Heywood Road Substation will enter service this winter 2

  3. Preliminary Analysis pre-MPRP Conclusions, June 2008 A new 115 kV line parallel to Section 83 would reduce line losses by 4 to 6 MW under peak load conditions Northern Hydro export capability will be increased with a new 115 kV line parallel to Section 83 MPRP system upgrades should be re-assessed in the Waterville/ Winslow/Skowhegan area with a new 115 kV line parallel to Section 83 Heywood & MPRP Sensitivity Analysis 3

  4. Study Objectives for MPRP Sensitivity Analysis Re-assess the MPRP system upgrades in the Waterville/ Winslow / Skowhegan area based upon New 115 kV line parallel to Section 83 between Wyman Hydro and Section 241 (with a new tap to Rice Rips) Conversion of Maxcys (Coopers Mills) 115 kV straight bus to a breaker-and-a-half configuration Heywood & MPRP Sensitivity Analysis 4

  5. Original MPRP system upgrades in the Waterville / Winslow / Skowhegan area: New 115 kV line from Albion to Winslow (Section 245) 115 kV Line Rebuilds to create space in ROW for new construction Section 84 (Albion to Winslow) Section 67A (Albion to Heywood Rd, new Section 259) Re-rate of 115 kV from Heywood to Rice Rips (Section 241) New 345/115 kV Albion Road Substation Breaker-and-a-half 115 kV configuration terminating Sections 67, 67A, 84, new Section 245 to Winslow, and 345/115 kV transformer 115 kV capacitor bank installations 50 MVAR at Heywood Road (increase from 20 MVAR today) 50 MVAR at Winslow Heywood & MPRP Sensitivity Analysis 5

  6. Study Assumptions Base cases originated from MPRP Needs Assessment New 115 kV line from Wyman Hydro to Section 241 (with a tap to Rice Rips) 39 miles of 1113 KCM ACSR conductor Interconnect with Section 241 with new tap 2.6 miles from Heywood Road Section 83 will not be re-rated Relocate Section 83B (Lakewood) Tap to new line Heywood & MPRP Sensitivity Analysis 6

  7. Heywood & MPRP Sensitivity Analysis 7

  8. Analysis used MPRP Northern Alternative N5 with modified Waterville/Winslow/Skowhegan facilities: Maxcys (Coopers Mills) 115 kV with breaker-and-a-half configuration All other N5 upgrades in service except for: Winslow and Heywood capacitor additions Rebuild of Section 259 (Albion to Heywood), formerly part of Section 67A Rebuild of Section 84 (Albion to Winslow) New Albion to Winslow 115 kV Line Heywood & MPRP Sensitivity Analysis 8

  9. N-1 and N-1-1 Assessment of Thermal Performance N-1: Section 84 (Albion to Winslow) overloaded for loss of Section 259 (Albion to Heywood) N-1-1: No additional thermal concerns Section 84 (Albion to Winslow) requires rebuild N-1 and N-1-1 Assessment of Voltage Performance N-1-1 Low Voltage Concerns with Albion T1 or Maxcys T3 Outages with other contingencies 25 MVAR of capacitors at Winslow 115 kV meets N-1-1 voltage criteria (previously two MVAR capacitor banks) Heywood & MPRP Sensitivity Analysis 9

  10. Conclusions Re-assessment of MPRP reinforcements in the Heywood area showed that addition of the new parallel line, with relocation of Section 83B (Lakewood) Tap to Section 241 and a Maxcys 115 kV breaker-and-a-half yard, reduced the system upgrades required to meet N-1-1 criteria in the Heywood area The following system upgrades will no longer be required for MPRP 30 MVAR additional capacitors at Heywood 25 MVAR of capacitors at Winslow New 115 kV Section 245 (Albion to Winslow) Rebuild of 115 kV Section 259 (Albion to Heywood) Heywood & MPRP Sensitivity Analysis 10

  11. Conclusions, cont. The following system upgrades are still required for MPRP in the Waterville/Winslow/Skowhegan area Rebuild of 115 kV Section 84 (Winslow to Albion) Re-rate of 115 kV Section 241 (Heywood to Rice Rips) New 345/115 kV Albion Road Substation Breaker-and-a-half 115 kV configuration for termination of Sections 67, 67A, 84, and 345/115 kV transformer 115 kV capacitor bank installation 25 MVAR at Winslow (previously two 25 MVAR capacitor banks) Heywood & MPRP Sensitivity Analysis 11

  12. 12

  13. Option A: Re-rate Section 83 13

  14. Option B: New 115kV Line parallel to Section 83 14

  15. Combined Results of Heywood Road and MPRP analyses Estimated cost savings of not building these MPRP facilities = $12.8 million Net cost savings of building a new parallel 115 kV line from Wyman Hydro to Section 241 = $3.6 million New 115 kV line will reduce losses New 115 kV line will increase Wyman Hydro area export capability Heywood & MPRP Sensitivity Analysis 15

  16. Next Steps Conduct PPA sensitivity analysis of Heywood Road with a new 115 kV line parallel to Section 83, rather than re-rating Section 83 Conduct PPA sensitivity analysis of this new 115 kV line along with changes for MPRP Submit PPAs for changes Submit Transmission Cost Allocation (TCA) application for the Heywood Road Project with the cost credit of facilities avoided with MPRP and this new 115 kV line Submit Maine PUC Certificate of Public Convenience and Necessity for this new 115 kV line Heywood & MPRP Sensitivity Analysis 16

More Related