OPTIMAL PLANNING OF TRANSMISSION NETWORKS

Abstract

Currently, several transmission planning

techniques are available Those available techniques planning assumptions which

for application. involve different often lead to

suboptimal, but not optimal, results.

The main objectives of this thesis are to develop algorithms and digital computer programs .necessary for solving transmission planning problems. In this thesis, a new flexible and non­ linear transmission planning model is proposed. The model can be applied to both static (single time step) and dynamic (multi time step) planning modes. In the proposed model, the cost function includes an accurate representation of the fixed cost of potential transmission lines and substations, tile operating cost, and cost of losses for all existing and potential substations and transmission lines. The cost function is

minimized subject constraints, line admand satisfaction substation capacity

constraints, plant capacity constraints, stability conatraints and logic constraints. In addition, different operating voltage levels, accurate power flow in each part of the system, l11terest and inflation rates are included in the newly developed model. One of the main feature of this

ork is tl1e development of a new modified contingency analysis model. This model is very important and useful in securing system

reliabillty. Single, multiple, and severe contingency tests can be easly handled by this model. Application of the developed model and comparision with other available models results i251, have shown that the model is accurate, efficient and easy to apply. This thesis ls devided into five chapters. In Chapter I, general introduction· in· which previous work is reviewed and the scope of th

thesis is outlined. In Chapter II, mathematical

modelling algorithms

of the transmission planning and are described, In Chapter III, the

ppllcDtluu ofthe model containing three different modes of study ; Static, Pesudo- dynamic and Dynamic modes and a comparison between them ·are presented. In addition, many different plan ing voltage levels (220 kv, 340 kv, 500 kv and 750'kv)' are discussed and compared. In Chapter IV, a contingency analysis model and its application including some cases study for the purpose of reliability criterion are presented. In Chapter V cor1cludlr1g remarks are stated.