Application of Tabu Search for transmission expansion planning considering power quality aspects

Abstract

In this paper, an optimization process based on the application of the Tabu Search is developed, in order to expand electrical networks by searching the topology that minimizes the voltage sag/year number in the electrical system. A case study is presented, in which a static transmission expansion planning in an IEEE test system is addressed, in order to demonstrate the application of the developed methodology.Keywords-Network expansion, power quality, tabu search, voltage sags (dips). I. INTRODUCTIONThe demand of electricity has been increasing over the years. For this reason, the expansion of electrical networks is necessary, and efficient and reliable construction techniques are required. These techniques must be consistent with the competitive environment of the current electricity market.The objective of the network expansion planning consists in determining an (optimal) expansion plan for the electric network with circuits that satisfy the operational requirements for a forecasted demand growth [1]. Basically, the problem to be addressed is how to minimize the cost of the expansion network, maintaining a certain level of reliability [2]-[6].The network expansion, both at distribution and transmission level, may be studied using static or by dynamic models. A static model tries to answer questions like where and which type of new circuits should be built in an optimal way planning horizon. A dynamic model tries to answer the same questions but, in addition, answers the question of when to add new circuits. In other words, the dynamic model considers several horizons in the same issue [1] [7].On the other hand, in the past, both aspects of operation and planning were in the hands of centralized institutions. Today, the separation of the electricity business has created new challenges in the restructuring industry that must be faced. The restructuring of the electricity industry has resulted in the appearance of new actors, such as traders and independent power producers, which make the expansion planning more difficult [2] [8].Moreover, the electricity market deregulation has led to an increased need for quality indicators, in order to be more competitive and to attract end-users which are demanding higher levels of power quality that is related to electrical

Expansion of Electrical Networks Considering Power Quality Aspects by Applying a Multi-objective Tabu Search Technique

“…In all possible topologies, the process must take into consideration some restrictions, such as the system connectivity (ensuring that no areas of the systems are isolated), voltage limits and power balance [9].…”

“…Next in order to formulate the problem of multi-objective optimization, representation and similar considerations as those reported in the previous work in [9] are assumed. Note that in [9] the proposed approach is focused on the solution of the optimal network expansion with a single objective.…”

“…Note that in [9] the proposed approach is focused on the solution of the optimal network expansion with a single objective.…”

“…The way to represent if a line would be built to expand the electrical network is by means of a parameter that permits the use of a binary representation, where the x(i) value is obtained according to the next criterion [9]:…”

“…On the other hand, end-users are demanding higher levels of power quality that is related to electrical disturbances, which can affect the electrical conditions of power supply, such as voltage sags that are one of the most important concerns of power quality [9].…”