Article
Power system transmission network expansion planning using AC model
Univ. of Campinas, Campinas
IET Generation Transmission & Distribution (Impact Factor: 1.31). 10/2007; 1(5):731  742. DOI: 10.1049/ietgtd:20060465 Source: IEEE Xplore
ABSTRACT An optimisation technique to solve transmission network expansion planning problem, using the AC model, is presented. This is a very complex mixed integer nonlinear programming problem. A constructive heuristic algorithm aimed at obtaining an excellent quality solution for this problem is presented. An interior point method is employed to solve nonlinear programming problems during the solution steps of the algorithm. Results of the tests, carried out with three electrical energy systems, show the capabilities of the method and also the viability of using the AC model to solve the problem.

 "Such approaches include, among others, multistage dynamic planning [7] [8] [9], demand uncertainty [10] [11] [12], and the inclusion of security constraints (N À 1 criterion) [9,13–15]. Solutions for these mathematical models have been proposed in the literature using different optimization techniques such as metaheuristics [7,16–20], and mathematical programming, [4] [6] [15] [21] [22]. Despite of the great number of model adaptations and solution approaches applied to the TEP problem, there is not reference in http://dx.doi.org/10.1016/j.ijepes.2015.01.008 01420615/Ó 2015 Elsevier Ltd. "
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ABSTRACT: Transmission expansion planning (TEP) is a classic problem in electric power systems. In current optimization models used to approach the TEP problem, new transmission lines and twowinding transformers are commonly used as the only candidate solutions. However, in practice, planners have resorted to nonconventional solutions such as network reconfiguration and/or repowering of existing network assets (lines or transformers). These types of nonconventional solutions are currently not included in the classic mathematical models of the TEP problem. This paper presents the modeling of necessary equations, using linear expressions, in order to include nonconventional candidate solutions in the disjunctive linear model of the TEP problem. The resulting model is a mixed integer linear programming problem, which guarantees convergence to the optimal solution by means of available classical optimization tools. The proposed model is implemented in the AMPL modeling language and is solved using CPLEX optimizer. The Garver test system, IEEE 24busbar system, and a Colombian system are used to demonstrate that the utilization of nonconventional candidate solutions can reduce investment costs of the TEP problem.International Journal of Electrical Power & Energy Systems 07/2015; 69:213221. DOI:10.1016/j.ijepes.2015.01.008 · 3.43 Impact Factor 
 "Given the computational complexity of modelling AC power flow a linear direct current (DC) approximation model is usually sufficient for the purposes of long term expansion network planning. However, recent research has also considered AC power models [15] [19]. An extension to the disjunctive TEP formulation that considers the location of ESS is developed by Hu et. "
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ABSTRACT: In electricity transmission networks, energy storage systems (ESS) provide a means of upgrade deferral by smoothing supply and matching demand. We develop a mixed integer programming (MIP) extension to the transmission network expansion planning (TEP) problem that considers the installation and operation of ESS as well as additional circuits. The model is demonstrated on the well known Garver's 6bus and IEEE 25bus test circuits for two 24 hour operating scenarios; a short peak, and a long peak. We show optimal location and capacity of storage is sensitive not only to cost, but also variability of demand in the network. 
 "Nevertheless, the nonlinear and nonconvex nature of the ACTEP model makes the problem difficult to solve and to obtain a globally optimal solution. [2] presented a mixedinteger nonlinear programming (MINLP) approach for solving TEP problems using the AC network model. The interior point method and a constructive heuristic algorithm were employed to solve the relaxed nonlinear programming problem and obtain a good solution. "
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ABSTRACT: The expansion plan obtained from a DC model based transmission expansion planning (TEP) model could be problematic in the AC network because the DC model is potentially inaccurate. However, solving TEP problems using the AC model is still extremely challenging. The motivation for this work is to develop a less relaxed network model, based on which more realistic TEP solutions are obtained. The proposed TEP model includes a linear representation of reactive power, offnominal bus voltage magnitudes and network losses. Binary variables are added to avoid fictitious losses. Garver's 6bus system is used to compare the proposed TEP model with the existing models. An iterative approach for considering the N 1 criterion during the planning process is developed and demonstrated on the IEEE 118bus system. Simulation results indicate that the proposed TEP model provides a better approximation to the AC network and is applicable to large power system planning problems.IEEE Transactions on Power Systems 08/2013; 28(3):34713479. DOI:10.1109/TPWRS.2013.2250318 · 3.53 Impact Factor
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