Methods of linear and nonlinear state estimation of distribution network

Golub, Irina; Boloev, Evgeny

doi:10.1051/e3sconf/20185803010

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…They are non-linear loads whose resistance changes over time. The current consumed by these sources has a pronounced pulse character, that is, in contrast to the sinusoidal current of linear loads [1], it is a periodic non-sinusoidal signal [2,3].…”

Section: Introductionmentioning

confidence: 99%

Archives of Electrical Engineering

Yudaev,

Rud,

Yundin

et al. 2021

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Due to the extensive use of nonlinear power consumers, there is currently an urgent problem of high harmonic content in power supply networks. The paper provides experimental investigations and a study of the nature of the change in the main harmonic components of the current in the neutral working wire of a three-phase four-wire network with a voltage of 0.38 kV. The purpose of this study is to compare the load readings on the amplitude-phase-frequency characteristics of the current in the neutral working wire of the 0.38 kV network with the linear and non-linear load. To study the effect of load changes on the amplitude-phase-frequency characteristics of currents in the linear and zero working wires at the input of the load node, measurements were carried out by certified electrical measuring instruments. The analysis of the results obtained for the load node whose power was formed mainly by a lighting system with fluorescent and LED lamps and a system of office electrical receivers (computers, copiers, printers, scanners, etc.) was performed. It can be concluded that a current comparable to the currents of the linear wires of the network flows from the load node with the predominant nonlinear power receivers through the zero-working wire. At the same time, in the zero-working wire of the network, the third harmonic currents prevail over the main frequency currents.

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Section: Introductionmentioning

confidence: 99%

Archives of Electrical Engineering

Yudaev,

Rud,

Yundin

et al. 2021

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Allocation of power losses and energy in the distribution network

Krupeneva,

Boloev,

Golub

2024

jour

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The goal is to determine methods for calculating power losses in a three-phase four-wire low voltage distribution network using measurements of a balance smart meter and consumer smart meters, and to establish the factors influencing the power losses and their allocation among individual network wires, loads, and consumers. The study involved examining three methods for determining power losses for current measurement snapshot. The first method suggests calculating losses as the difference between the power supplied to the network and the total power consumed. The second method calculates power losses using the contribution method. The third method, which in addition to measurement information requires knowledge of the topology and parameters of the network components, determines power losses based on the results of the state estimation method. The research proposes an algorithm for transition from a four-wire distribution network modeling to a three-wire one. The algorithm allocates power losses of the neutral wire among the phase wires. The findings indicate that the negative losses in the network with unbalanced phase loads are caused by the presence at the nodes of the least loaded phase of higher voltage than the voltage at the power supply node. The reason for higher losses in phases with minimal load is the uneven allocation of loads in the phases. In addition, the study reveals that the power loss values obtained by the contribution method, i.e. directly from the measurements of smart meters, are closer to the losses determined from the readings of the balance meter and consumer meters, compared to the losses found from the state estimation results. The considered methods for calculation and allocation of power losses are illustrated by an example of a real-world distribution network equipped with smart meters. The paper demonstrates the examples of allocating total power losses between phase wires and a neutral wire, among phase wires only, and between total loads at phase nodes and individual consumers in phases.

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Methods of linear and nonlinear state estimation of distribution network

Cited by 2 publications

References 9 publications

Archives of Electrical Engineering

Archives of Electrical Engineering

Allocation of power losses and energy in the distribution network

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