Portal de Periódicos da CAPES

Planejamento de redes de distribuição de energia elétrica de média e baixa tensão

2008; Linguagem: Inglês

2639-6459

Antônio Marcos Cossi,

Business and Management Studies

This work presents the theory, the mathematical model, the solution techniques and the results of the developed research dealing with MV (medium voltage) electrical energy distribution network planning and the secondary circuit project of LV (low voltage). The problem of planning MV networks and planning and project LV circuits is approached by a complete modeling and the solution proposals are effectuated by mono and multi objective meta heuristics. The restrictions considered in these models are referred to the radial form of the planned systems, demand supplying on the busses in each stage of the planning program, maximum limits of voltage drops allowed on the feeders, physical restrictions of operation on the equipments and financial restrictions. The planning model of MV network is approached as a multi objective nonlinear integer mist programming problem (NLIMPP). The objectives are referred to the investment costs, and reliability costs. To solve the problem a reactive Tabu Search (TS) algorithm is used where the multiple objectives are considered by the optimal frontier Pareto concept. To evaluate the solution proposals a monophasic power flow algorithm is used as an auxiliary tool. The secondary circuit planning and project models consider as much as planning and project actions. For this a three stage methodology is proposed: the first is referred to load balancing on abc phases of the circuit; the second to the location (generally on the load center) capacity and quantity of lower transformers on the network, and the third defines the directions and the type of the secondary feeders. The model is formulated as a nonlinear integer mist programming problem (NLIMPP), and for the solution is proposed a TS algorithm. To evaluate the solution proposals a three phase power flow with four conductors (three phases and one neutral) is used as an auxiliary algorithm. The integrated planning of LV and MV networks is executed in two steps: (1) constructive and, (2) Improving step (local search). To integrate the planning of MV and LV systems a heuristic technique is proposed, which is composed of a set of rules that are practical found making the connections with the LV and MV networks. To solve the problem of the integrated planning distribution system is used a TS (Tabu search) algorithm. The TS algorithm was developed to explore the specific characteristics of the planning problem, obtain reliability of the results and computational efficiency. Results are presented for real distribution systems and other systems found on the literature.