Abstract
Expanding an electrical transmission network requires heavy investments that need to be carefully planned, often at a regional or national level. We study relevant theoretical and practical aspects of transmission expansion planning, set as a bilinear programming problem with mixed 0–1 variables. We show that the problem is NP-hard and that, unlike the so-called Network Design Problem, a transmission network may become more efficient after cutting-off some of its circuits. For this reason, we introduce a new model that, rather than just adding capacity to the existing network, also allows for the network to be re-designed when it is expanded. We then turn into different reformulations of the problem, that replace the bilinear constraints by using a “big-M” approach. We show that computing the minimal values for the “big-M” coefficients involves finding the shortest and longest paths between two buses. We assess our theoretical results by making a thorough computational study on real electrical networks. The comparison of various models and reformulations shows that our new model, allowing for re-design, can lead to sensible cost reductions.
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Abbreviations
- S :
-
bus-circuit incidence matrix
- i∈B:
-
index bus, in the set of buses
- \(\overline{g}_{i}\) :
-
maximal generation at bus i
- d i :
-
load at bus i
- Ω=Ω0∪Ω1 :
-
set of all circuits
- Ω0 :
-
set of existing circuits
- Ω1 :
-
set of candidate circuits
- |Ω1|:
-
cardinality of set Ω1
- i(k), j(k):
-
terminal buses of circuit k
- γ k :
-
susceptance of circuit k
- \(\overline{f}_{k}\) :
-
capacity of circuit k
- c k :
-
investment cost of circuit k
- k 1 ∦ k 2 :
-
not parallel circuits
- k 1 ∥ k 2 :
-
parallel circuits
- E=E0∪E1:
-
set of all “fat” edges
- E 0 :
-
set of “fat” edges containing existing circuits
- E 1 :
-
set of “fat” edges containing candidate circuits
- \(\overline{x}_{ij}\) :
-
maximum number of circuits that can be built between i and j
- x ij :
-
existing number of circuits between i and j
- (ij):
-
“fat” edge between i and j
- ℓ∈ℒ ij :
-
index circuit among all circuits belonging to “fat” edge (ij)
- SP i−j :
-
shortest path between buses i and j
- LP i−j :
-
longest path between buses i and j
- \(\mathit{LP}_{i-j}^{l}\) :
-
longest path between buses i and j not passing through bus l
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C. Sagastizábal on leave from INRIA Rocquencourt, France.
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Moulin, L.S., Poss, M. & Sagastizábal, C. Transmission expansion planning with re-design. Energy Syst 1, 113–139 (2010). https://doi.org/10.1007/s12667-010-0010-9
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DOI: https://doi.org/10.1007/s12667-010-0010-9