Table 4: Five transmission expansion plans considering high-cost phase-shifter transformers.

CircuitsPlan 𝑃 0 Plan 𝑃 1 Plan 𝑃 2 Plan 𝑃 3 Plan 𝑃 4
TLPSTLPSTLPSTLPSTLPS

𝐧 0 1 - 0 5 11
𝐧 0 3 - 2 4 111
𝐧 0 6 - 1 0 11111
𝐧 0 7 - 0 8 22122
𝐧 0 9 - 1 1 1
𝐧 1 0 - 1 2 1111
𝐧 1 1 - 1 4 1
𝐧 1 4 - 1 6 11111
𝐧 1 5 - 2 4 11
𝐧 1 6 - 1 7 2211
𝐧 1 6 - 1 9 1
𝐧 1 7 - 1 8 22
𝐧 2 0 - 2 3 1

Partial cost15203900392021803460

Total cost152390392218346