scholarly journals Operative calculation of electric power losses in the network with unknown parameters in AIMS EMA

2020 ◽  
Vol 22 (5) ◽  
pp. 116-127
Author(s):  
M. I. Danilov ◽  
I. G. Romanenko
Keyword(s):  
Phase Distribution ◽  
Climatic Factors ◽  
Observation Interval ◽  
Measuring System ◽  
Power Losses ◽  
Electric Networks ◽  
Unknown Parameters ◽  
Three Phase ◽  
Information Measuring System ◽  
Commercial Accounting

THE PURPOSE. The process of o n-line calculation of electricity losses in three phase distribution electric networks (DEN) with a voltage of a 0,4 kV, where monitoring of electricity losses (commercial accounting) is carried out by an automated information measuring system of electrici ty monitoring and accounting (AIMS EMA) is considered. The problem of operative detecting of unauthorized power take -offs in the DEN under condition of unknown values of parameters of the network equivalent circuit, i.e. resistances of its interpersonal sections, which can change significantly over time because of external climatic factors (temperature, humidity, etc.) is being solved. METHODS. The procedure of the proposed calculation can be implemented by the available means of AIMS EMA. It is based on simultaneous measurements for the same observation interval of effective values of current and voltage, active and reactive powers at the beginning of the DEN and at each subscriber. In the course of periodic measurements of these mode parameters, the initial data used in the proposed calculation are formed. RESULTS. The analysis of the known methods of solving this problem is carried out, their disadvantages are shown and the new methodology, which is based on a preliminary operative calculation of reliable values of the resistances of interpersonal sections, provided that unauthorized power take -offs are possible in DEN is presented. While solving, the conditions of equality of resistances of the phase and neutral wires within the interpersonal section of th e DEN are used. The proposed method makes available the implementation of the operative calculation of technical losses in DEN and the identification of the commercial losses (unauthorized power take -offs) in it, as well as a detailed analysis of subscribe r data in order to detect the location (coordinate) and the amount of unaccounted electricity. CONCLUSIONS. The proposed methodology can be used in existing AIMS EMA without the introduction of additional measuring means (functions).

Identification of Power Grid Lines with Increased Power Losses Using Mobile Electric Meters and Timers

2020 ◽  
pp. 31-36
Author(s):  
Aleksandr V. Vinogradov ◽  
Aleksey V. Bukreyev ◽  
Alina V. Vinogradova ◽  
Vadim E. Bol’shev
Keyword(s):  
Single Phase ◽  
Power Grid ◽  
Electricity Consumption ◽  
Electrical Energy ◽  
Research Purpose ◽  
Power Losses ◽  
Electric Networks ◽  
Operating Modes ◽  
Three Phase ◽  
Quality Of Electrical Energy

Identifying sections of 0.4 kilovolt power grid lines with increased power losses is an urgent task, the solution of which will free up some of the funds spent by power grid companies to compensate for power losses and direct them to the reconstruction and modernization of electric networks. It is necessary to monitor electricity consumption on sections of power grid lines and on the connections of consumers, and compare data on consumption. Existing devices that analyze the quality of electrical energy and can control current and power in the network, such as power quality analyzers, do not have the full necessary qualities, since they are intended for other purposes, and they are also very expensive. (Research purpose) The research purpose is in developing technical means for identifying sections of 0.4 kilovolt power grid lines with increased power losses, which also allow performing a survey of operating modes of power grid lines. (Materials and methods) The article presents a review of literary sources and an analysis of statistical data. (Results and discussion) The article presents developed technical tools for inspection of power grid lines of 0.4 kilovolts and identification of areas with increased losses of electrical energy, portable single-phase and three-phase electric meter and timer. The single-phase mobile electric meter and timer can be used for the survey of single-phase connections of consumers, three-phase one can be used for the survey of any sections of power lines. Authors also developed a version of the portable electric meter and timer with up to six independent sensors. (Conclusions) It is most rational to use a version of the mobile meter and timer equipped with Wi-Fi data transmission technology to detect power losses on sections of 0.4 kilovolts power grid lines, since in this case simultaneous monitoring of several sections is provided with the possibility of obtaining information from sensors in real time. The data allow to calculate technological and commercial losses on power line sections and draw conclusions about whether they are overstated.

scholarly journals TO THE PROBLEM OF DIAGNOSTICS OF THE TECHNICAL STATE OF THE DISTRIBUTION NETWORKS LINES ACCORDING TO AIMS EMA DATA

2020 ◽  
pp. 56-64
Author(s):  
M. I. Danilov
Keyword(s):  
Climatic Factors ◽  
Distribution Network ◽  
Distribution Networks ◽  
Technical State ◽  
Measuring System ◽  
Operating Modes ◽  
Information Measuring System ◽  
Baseline Values ◽  
Ema Data ◽  
Diagnostic Criterion

The problem of organization of monitoring and diagnosing of the technical state of a four-wire distribution electric network (DEN) by means of an automated information-measuring system of monitoring and accounting of electricity (AIMS EMA) consumed by subscribers is considered. As parameters characterizing the technical state of the DEN, the values of the active resistances of the lines (wires) in the network are taken. The indicated parameters can change significantly over time depending on the values of flowing currents, climatic factors of the external environment, as well as due to wear out of the wires. A technique of the operational identification of resistances of inter-subscriber DEN sections, which uses the data of the distribution network operating modes is proposed. Its implementation in AIMS EMA allows to monitor changes in values of their active resistances. A procedure of diagnosing lines in DEN is presented, it consists in analyzing the dynamics of active resistances values changes obtained at different points in time, and identifying the increase of the wear level of individual wires against the background of flowing currents and climatic factors. It is believed, that external influences lead to the same relative changes of parameters of all wires for the same interpersonal site. The wear diagnostic criterion is an increase of the active resistance values for individual wires with their unequal change relatively to the baseline values, which are determined during observations of the distribution network condition.

scholarly journals Power Losses Analysis in a Three-Phase Distribution Transformer Using Artificial Neural Networks

2020 ◽  
Vol 18 (2) ◽  
pp. 130-136
Author(s):  
Somsak Siriporananon ◽  
Boonlert Suechoey
Keyword(s):  
Phase Distribution ◽  
Measurement Data ◽  
Original Method ◽  
Percentage Error ◽  
Power Losses ◽  
Distribution Transformer ◽  
Neutral Networks ◽  
Research Article ◽  
Three Phase ◽  
C 50

This research article presents the analysis of power losses in a three - phase distribution transformer, 100 kVA 22 kV-400/230V by using artificial neutral networks that can analyze the power losses in distribution transformer faster and use less variables than the original method. The measurement data were collected 100,000 sets at the transformer manufacturer factory by setting the current flow from 1% to 100% at temperature 30 °C, 35 °C, 40 °C, 45 °C, 50 °C, 55°C, 60 °C, 65 °C, 70 °C, and 75 °C to calculate the power losses in a distribution transformer. The collected data were divided 80,000 sets to use for training in order to find parameters of artificial neutral networks and 20,000 sets were used for the artificial neutral networks input in order to calculate power losses in a distribution transformer. From the power losses in the distribution transformer of artificial neutral networks testing compared with the calculated valued from the measurement. The percentage error was at the satisfactory level and can be applied to design the testing of power losses in the distribution transformer in the future.

SPACE SURVEILLANCE SYSTEM’S SAR SIGNAL DETECTION RESULTS

2018 ◽  
pp. 63-68 ◽  
Author(s):  
A. V. Ksendzuk ◽  
A. A. Kanatchikov ◽  
P. A. Gerasimov
Keyword(s):  
Signal Detection ◽  
Surveillance System ◽  
Observation Interval ◽  
Pulse Repetition Frequency ◽  
Storage Device ◽  
Periodic Signal ◽  
Unknown Parameters ◽  
Software Optimization ◽  
Space Objects ◽  
Field Programmable

Special aspects of space objects radiotechnical surveillance system used for filling the space tracking and surveillance system (STSS) satellite catalogue described and analyzed. Special emphasis placed on spaceborne synthetic aperture radar signals detection. Parameters of the SAR signals estimated with the proposed radiotechnical surveillance system described. Two processing methods for unknown and partially known signals proposed and analyzed. Signal detection with incompletely known parameters performs with cumulative second-order statistic. Signal detection with unknown parameters performs for periodic signal in assumption that observation interval exceed pulse repetition frequency. Proposed methods implemented in hardware demonstrator of radiotechnical surveillance system. This demonstrator works in real-time on Field Programmable Gate Array or save data on storage device for post-processing. L-band Palsar2 signal detection results presented and analyzed. Further work for hardware and software optimization described.

scholarly journals Optimal Selection of Conductors in Three-Phase Distribution Networks Using a Discrete Version of the Vortex Search Algorithm

Computation ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 80
Author(s):  
John Fernando Martínez-Gil ◽  
Nicolas Alejandro Moyano-García ◽  
Oscar Danilo Montoya ◽  
Jorge Alexander Alarcon-Villamil
Keyword(s):  
Objective Function ◽  
Power Flow ◽  
Phase Distribution ◽  
Search Algorithm ◽  
Distribution Networks ◽  
Discrete Version ◽  
Optimal Selection ◽  
Flow Method ◽  
Three Phase ◽  
Selection Of

In this study, a new methodology is proposed to perform optimal selection of conductors in three-phase distribution networks through a discrete version of the metaheuristic method of vortex search. To represent the problem, a single-objective mathematical model with a mixed-integer nonlinear programming (MINLP) structure is used. As an objective function, minimization of the investment costs in conductors together with the technical losses of the network for a study period of one year is considered. Additionally, the model will be implemented in balanced and unbalanced test systems and with variations in the connection of their loads, i.e., Δ− and Y−connections. To evaluate the costs of the energy losses, a classical backward/forward three-phase power-flow method is implemented. Two test systems used in the specialized literature were employed, which comprise 8 and 27 nodes with radial structures in medium voltage levels. All computational implementations were developed in the MATLAB programming environment, and all results were evaluated in DigSILENT software to verify the effectiveness and the proposed three-phase unbalanced power-flow method. Comparative analyses with classical and Chu & Beasley genetic algorithms, tabu search algorithm, and exact MINLP approaches demonstrate the efficiency of the proposed optimization approach regarding the final value of the objective function.

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