Formation of a Strategy for Increasing the Efficiency of Operation of Distribution Electrical Grids at the Stage of Pre-Design Works

Abstract

The main criterions to assess the quality of operation of distribution electrical grids are considered. It is shown that in power supply companies as early as at the pre-design formation of the strategy of modernization and reconstruction of electrical grids, it is necessary to choose the optimal measures for each mainline with a clear sequence of implementation of the selected measures in the electrical grid taking into account prospects of its development. A mathematical model of the classification of mainlines of distribution electrical grids has been developed according to the state of their operation, viz. successful operation, strenuous operation and unacceptable operation. On the basis of this model an algorithm for a choice of the optimal technical measures for the reconstruction of mainlines has been formed depending on their state: for mainlines in the strenuous state it is possible to replace the wire of the section or an installation of a battery of statistical capacitors at the remote transformer substations; for mainlines in the unacceptable state, in accordance with the results of an expert assessment of possible measures taking into account the electrical grid development, the prospects of increase of the load, the construction of unloading points, the connection to the distributed generation electrical grid, a decision is being made to replace the wire section, to transform a part or the whole electrical grid to higher voltage level. This allows formalizing the procedure for the choice and implementation the outlined measures as early as at the stage of pre-design formation of the modernization and reconstruction strategy so to provide an efficient use of funds for the reconstruction and technical retooling of distribution electrical grids in order to improve the quality of their operation. The mathematical model and the algorithm for the choice of the optimal technical measure for the reconstruction of the mainline taking into account the prospects for development that had been developed was tested during the development of the optimal strategy for the development of 6–10 kV distribution electrical grids in the Western region of Ukraine.

Keywords

• distribution electrical grid
• a mainline
• steady-state mode
• mathematical model
• an algorithm
• criterions of operation
• technical measure
• economic efficiency
• development strategy