Abstract
This paper reports solving an important scientific task of minimizing the economic losses caused by the established deviation and the asymmetry of voltage in the distributing electrical networks with a rated voltage of 10 kV.It has been found that the existing systems of automated control over the mode parameters of distributing electrical networks do not fully take into consideration the multifunctional influence of symmetry-compensating devices at the level of electricity quality indicators.It has been proposed to use, as the criteria functions for the task on automated control over the electric power quality indicators, the functional dependences that assess the level of losses caused by the established deviation and asymmetry of voltage in electrical networks. That has made it possible, in contrast to existing control systems, to better account for the negative impact of the established deviation and asymmetry of voltages on the modes of electric network operation.We have determined the functional dependences between the input and output parameters of the control object (a distributing electric network with a voltage of 10 kV with a symmetry-compensating device), which formed the basis of the criteria functions for a multi-criteria optimization problem. The ultimate solution to the problem on a multi-criteria optimization based on a method of approaching a utopian point in the criteria space was derived by minimizing the Chebyshev distance from the utopian point to a Pareto-optimal set of solutions. Based on the obtained solution to the problem on a multi-criteria optimization, we have built an algorithm for determining the vector of optimum control.Computer simulation of the optimal automated control system for the power quality indicators in distributing electrical networks has been performed.Analysis of the simulation results has revealed that the automated control system proposed in this work, when compared with the existing ones, makes it possible to reduce the negative effect exerted by the above-the-norm values of the established deviation and asymmetry of voltage on the operation of electrical networks
Highlights
The current stage of the global power generation deve lopment is characterized by a significant aggravation of the issue related to the operational efficiency of distributing electrical networks (DENs)
Our analysis has revealed that in order to improve the operational efficiency of an ASC over the level of electricity quality indicators in a DEN, based on the solution to the problem of multicriteria optimization using the method of approaching a utopian point, it is necessary to use, as the criteria functions, the dependences that determine the negative influence exerted by the established deviation and the asymmetry of voltages on the DEN operation
Such an approach to automatic control makes it possible to take into consideration the inequivalence of the negative impact exerted by the specified electricity quality indicators (EQIs) on DEN operation
Summary
The current stage of the global power generation deve lopment is characterized by a significant aggravation of the issue related to the operational efficiency of distributing electrical networks (DENs). One of the main reasons for the compromised efficiency and the less cost-effective operation of DENs is the deterioration of electricity quality This problem is especially acute for the distributing networks with a rated voltage of 10 kV, which power large asymmetric electricity consumers (induction furnaces, arc steel furnaces, etc.). The most effective way to reduce the levels of the specified electricity quality indicators (EQIs) is the use of specialized technical means – symmetry-compensating devices (SCDs) These devices exert a multifunctional influence on the DEN mode settings, which imposes certain requirements for the autom ated control systems (ACS) of the SCD operation mode. It is a relevant task to improve the ACS of the DEN operation with SCD in order to minimize the negative impact exerted on the DEN operation by the established deviation and the asymmetry of voltage
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