THE PROBLEM OF THE STRUCTURE OPTIMIZATION OF AN UNINTERRUPTED POWER SUPPLY SYSTEM OF THE RESPONSIBLE CONSUMERS OF THE OBJECTS OF THE DEPARTMENT OF DEFENSE
Modern trends in the development of technological and technical systems of armaments of the Department of defense of the Russian Federation (RF) cause increased requirements to the reliability of a power supply of the responsible consumers and the quality of electricity in all modes of their operation. Now to ensure these requirements are most commonly used the uninterruptible power supply system (UPSS) performed on the base of the source of uninterruptible power supply (SUPS) having a number of advantages if compared it with the systems based on dynamic the UPSS. According on the requirements of the uninterrupted operation and the quality of a power supply, the volume and the capacity of consumers, the location conditions of the main equipment of the UPSS and other factors, the construction of the uninterrupted power supply systems can be performed through various plans. The article deals with the definition and conceptual model of the optimization problem of the structure and the parameters of the UPSS of the responsible consumers, on the basis of which the mathematical statement of the considered problem was formulated. In constructing mathematical model of optimization problem the UPSS takes into account two main indicators of the efficiency: as an economic indicator - a capital cost, that is the costs of the purchasing equipment, the UPSS, and as a measure of the reliability - the probability of an failure-free operation. The problem of the optimization of the structure and the parameters of the UPSS reduced to the single-criterion optimization problem, in which as the optimality criterion adopted the economic criteria. The required level of the reliability of the power supply taking into account the possibility of redundancy of the SUPS is accounted for in the form of the restriction. Defined the procedure of calculating the probability of failure- free operation of the UPSS with a given multiplicity of a redundancy. Introduced and defined variables, fixed values which define the individual solution of the problem, the objective function representing a total capital cost of the construction of the UPSS all responsible consumers and/or groups of such consumers, and a set of the limiting conditions. The objective function is assumed linear relationally to its variables. The variables are the Boolean variables, and this mathematical model belongs to the class of the linear Boolean mathematical models. Based on the analysis of the methods for solving the task of discrete optimization is proved through using the method of "branches and limits" algorithm of which is realized in MS Excel 2010. As an example, consider the decision of the problem of choosing an optimal variant of the UPSS construction based on the SUPS for specific initial conditions. The solution of the problem will allow choosing the optimal for the capital investment option of the building the uninterruptible power supply system, providing required level of the reliability of a power supply of the responsible consumers.