Control of Operational Modes of an Urban Distribution Grid under Conditions of Uncertainty

Abstract

The article is devoted to solving the problem of managing the mode parameters of an urban electrical network in case of a discrepancy between the actual electrical load and the specific load. Such an issue leads to a deviation of the parameters, in particular, voltage asymmetry in phases due to current asymmetry. To optimize the mode parameters, it is required that the effective value of the electrical load corresponds as much as possible to the values of the specific electrical load. This depends on the following: actual power consumption, external (climatic and meteorological) factors, internal factors (structural design of residential buildings, uneven load when distributed over the phases of three-phase lines and inputs, different number of electrical receivers for consumers), and the provision of consumers with other sources of energy (both gas and heat supply, and hot water supply). To establish the influencing factors on the actual power consumption, it is proposed to generalize the uncertainty accounting coefficient which generalizes both more well-known and less considered factors. Therefore, the authors propose models for determining the electrical loads based on the possibility of assessing the mode parameters of the electrical network by electrical loads. The accuracy of the proposed models is based on the use of the proposed forecasting method considering the actual power consumption and the generalized uncertainty coefficient. Applying the obtained data based on models of electrical loads to the constructed model of a part of a distribution electrical network with real parameters of the electrical network in the MathWorks Simulink environment, the correspondence to the mode parameters of the distribution electrical network is determined. As a result, a device for balancing the voltage depending on the load asymmetry is proposed that is related to the discrepancy between the mode parameters allowing control of the mode parameters by bringing them to acceptable values.

Communicationless Overcurrent Relays Coordination for Active Distribution Network Considering Fault Repairing Periods

“…These changes result from sustained load growth and the corresponding installation of distributed generation units (DGs). In recent times, various distributed generation units (DGs) have been integrated into interconnected power systems due to their advantages over installing remote generation stations [3,4]. To fully leverage the presence of DGs in the system, extensive studies have been conducted in the literature [5].…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] is greater than that of relay R 15-16 by a difference equal to or greater than CTI. Simultaneously, the t op of backward relay R 17-16 is greater than that of relay R 16-15 by a difference equal to or greater than CTI, as shown in Table16.•With section 1-2 disconnected, BC connected, and DGs connected, the t op of relay R 1-15 is greater than that of relay R 15-16 by a difference equal to or greater than CTI.…”