OPTIMIZATION OF STRUCTURE AND PARAMETERS OF ELECTRIC POWER SUPPLY NETWORKS
Due to high dimension of the problem of optimizing the structure of the electrical network and the complexity of the links between variables, step-by-step algorithms are used for performing targeted search of options. A number of methods provide global optimum searching, but to achieve a reasonable amount of solution time it is necessary to simplify significantly cost function of power line depending on its parameters. When using strict couplings, only the local optimum can be determined, but there are opportunities due to the weakening of the algorithm stickiness to reduce significantly the complexity of solving the problem of determining the optimal network structure, having preserved (implicitly) the connection of the efficiency function with the main parameters of the line: i.e. voltage and line conductor cross-section. The best pre-developed option for the network structure with the preset parameters can be determined by comparing the low bounds for neighboring subsets. At the same time, the process of subsets separating is carried out sequentially on the basis of the number of circuits, nominal voltage, and classical line conductor cross-section. After that, the neglected subsets should be checked for the possibility of improving the pre-developed option with the efficiency function. The authors found an expression that can be used at assessment of the network structure options; presented network structure optimization technique implemented in the form of a number of programs of the computer system. These arrangements take into account limitations on reliability in terms of network structure building rules, as well as the problem solution in the presence of a small number of closed circuits (up to four). In this case, the balance power exchange should be calculated in accordance with the reactive resistance of the arms of a network, and the optimal parameters of the projected arms should be selected by means of an iterative process. The use of such a complex for the analysis of small sections of a network together with the models of a more complete system will improve the efficiency of design solutions by expanding the range of options under consideration.