Researching and modelling of unbalanced regimes in systems of household electric power consumers

Abstract

The modelling of the operation modes of the 0.38/0.22 kV power supply systems by the Monte Carlo method using the Electronics Workbench computer program is considered, and statistical processing of simulation results and testing of the Pearson distribution law hypothesis using the Mathcad program are carried out. An analysis of existing power supply systems has been carried out and an alternative, economically feasible version of the power supply system is proposed, where consumers are powered by low power transformers mounted on supports. The performed studies showed that the variation of the load currents in the segments and the losses of electric energy in an asymmetrically loaded network of 0.38/0.22 kV are subject to the normal distribution law and that the consumers who feed on the traditional power supply system have unsatisfactory quality of electrical energy.

“Green technologies” elements by the individual residential buildings internal electrical networks operation

“…In the expression (1) -are the negative and zero sequences voltage unbalance coefficients; δU is the voltage deviation steady-state; U 2 and U 0 -are the negative and zero sequences voltages symmetrical components, respectively; U and U nom -are the actual and nominal the electrical network voltages, respectively.…”

“…This is due to the such networks saturation with new transformation means (for example, photovoltaic plants), as well as intelligent means that allow modes automatic control without human intervention (for example, flows that degrade the power quality). A significant publications number are devoted to the electrical networks various model's creation and their operating modes analysis [1][2][3][4][5][6][7][8][9]. Thus, a technologies use, which allow automating the electricity consumption processes, in order to increase its efficiency during the IRB internal electric networks modernization, can also be rightfully attributed to "green technologies".…”

Optimal Determination Method of the Transposition Steps of An Extra-High Voltage Power Transmission Line

“…In this formulation, the problems of EHV transmission lines were considered in isolation for the three most common modes: minimum, maximum, and operational modes of power transmission. Analytical expressions for determining the loss of active power in the power line contain components of idling and short-circuit losses [41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56]. The latter are directly and inversely proportional, respectively, to the square of the voltage on the bus terminals, which determines the possibility of choosing the optimal voltage level.…”