Todorov O. Electrotechnical complex for determining the current state of a cable line using instantaneous power

Українська версія

Thesis for the degree of Doctor of Philosophy (PhD)

State registration number

0825U003715

Thesis Registration Form

0825U003715.pdf

Applicant for

Oleg Todorov

Specialization

141 - Електроенергетика, електротехніка та електромеханіка

Specialized Academic Board

PhD 10903

Kremenchuk Mykhailo Ostrohradskyi National University

Essay

Due to the growing level of electricity consumption and the increasing load on transmission lines, the need for reliable monitoring of the technical condition of cable lines, which are critical elements of the power system, is rising. Traditional diagnostic methods, such as megohmmeter testing and high direct voltage withstand tests, may cause insulation degradation. Alternative safe methods (partial discharge analysis, reflectometry, dielectric loss measurements) require prior cable de-energization, which limits their applicability under actual operating loads. Particular attention is paid to continuous monitoring systems. The vast majority of such systems are focused on node-based observation, whereas effective monitoring of cable line conditions requires the analysis of inter-node electrical quantities. To enable a more detailed analysis of power quality under harmonic distortion and unbalance, IEEE Standard 1459-2010 has been applied, which provides for the decomposition of apparent power into its components. To refine the dynamics of power variation, statistical methods have been employed, including mean value, root mean square deviation, as well as normalized skewness and kurtosis coefficients. In order to assess the effect of the load by detecting changes in the degree of linear correlation, a correlation analysis between powers has been conducted. Changes in active and reactive power of an industrial enterprise were analyzed using wavelet transform. Based on the obtained decompositions, time intervals were identified in which the dynamics of power variations were higher compared to others. Modeling in Simulink allowed for a comparison between an ideal cable line and a line with altered interphase conductance parameters. Thus, using time-frequency analysis of instantaneous power obtained from two experiments, manifestations of insulation defects causing an increase in high-frequency pulsations were investigated. However, as a tool for fault localization within the cable line, when comparing experiments with changes in interphase conductance parameters at different distances, the differences in power values showed low significance. Two approaches to determining cable parameters were also analyzed: using Γ-type and Π-type equivalent circuit models. The Π-type equivalent circuit method, based on the analysis of instantaneous power components, demonstrated better accuracy and stability under varying loads. Based on the obtained results, a structure of the cable line monitoring system was developed, consisting of two measuring units located at the ends of the line and a central data processing unit. Two options for communication organization are provided: remote via GSM network and a combined mode for local interaction. Software modules have been developed to implement algorithms for power quality analysis based on instantaneous power calculations and wavelet decomposition, which enables the detection of high-frequency power oscillations and ensures the implementation of the proposed methodology.

Thesis supervisor

Oleksii V. Bialobrzheskyi

Official opponents

Vadym Y. Lobodzynskyy
Dmytro Yarymbash
Dmytro Zhuk

Reviewers

Vyacheslav V. Prus

Research papers

Тодоров О. В., Бялобржеський О. В. Аналіз структури сучасної автоматизованої системи контролю та обліку електроенергії, первинних пристроїв збору та обробки даних, Вісник КрНУ, Кременчук, Україна, 2020 – №1, с. 145-150. DOI: 10.30929/1995-0519.2020.1.145-150

Тодоров О. В., Бялобржеський О. В., Беззуб М. А., Рева І. В. Підсистема обробки вибірок даних активної та реактивної потужності трансформаторної підстанції, Електротехніка та електроенергетика, Запоріжжя, Україна, 2021 – №2, с. 25 – 30, DOI: 10.15588/1607-6761-2021-2-3

Тодоров О. В., Бялобржеський О. В., Беззуб М. А., Рева І. В. Електротехнічний комплекс моніторингу трифазної системи живлення електричної машини з детектуванням вібраційних складових електричної потужності, Електромеханічні і енергозберігаючі системи, Кременчук, Україна, 2022 – № 1, с. 26 – 32., DOI: 10.30929/2072-2052.2022.1.57.26-32

Bialobrzheskyi O., Nozhenko V., Todorov O. Influence of Misalignment of Connection of Electrical Machine Shafts on the Nature of Electric Power of the Induction Motor. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2022. (6), pp. 90 – 96., DOI: 10.33271/nvngu/2022-6/090 (Scopus)

Bialobrzheskyi O., Todorov O., Postil A., Bezzub M., Sulym A. Cable line equivalent circuit parameters determination using the instantaneous power components, Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2024. (2), pp. 96 – 103., DOI: 10.33271/nvngu/2024-2/096 (Scopus)

O. Todorov, O. Bialobrzheskyi, A. Sulym Application of IEEE 1459-2010 for the power investigation a traction secondary voltage, 2020 IEEE KhPI Week on Advanced Technology (KhPIWeek), 2020, pp. 199-204, doi: 10.1109/KhPIWeek51551.2020.9250094.

O. Todorov, O. Bialobrzheskyi, S. Bondarenko, Virtual Complex Prototype for Metering a Three-Phase Network Electric Power Quantity and Quality, 2020 IEEE Problems of Automated Electrodrive. Theory and Practice (PAEP), 2020, pp. 1-5, doi: 10.1109/PAEP49887.2020.9240845.

O. Todorov, O. Bialobrzheskyi, I. Reva, M. Bezzub, Abruptly Changing Load Timediagram Analysis of Transformer Substation Using Wavelet Transform, 2021 IEEE 2nd KhPI Week on Advanced Technology (KhPIWeek), 2021, pp. 396-400, doi: 10.1109/KhPIWeek53812.2021.9570080.

O. Todorov, O. Bialobrzheskyi, S. Yakimets, Virtual Instrument Module for Detecting Current and Voltage Distortion in Three-Phase Networks, 2021 IEEE International Conference on Smart Information Systems and Technologies (SIST), 2021, pp. 1-5, doi: 10.1109/SIST50301.2021.9465953.

O. Todorov, O. Bialobrzheskyi, I. Reva, M. Bezzub, The Electric Power Quantities Correlation Degree Estimation on Substation Transformer Secondary Voltage Buses an Industrial Enterprise, 2021 IEEE International Conference on Modern Electrical and Energy Systems (MEES), Kremenchuk, Ukraine, 2021, pp. 1-5, doi: 10.1109/MEES52427.2021.9598729

O. Todorov, O. Bialobrzheskyi, M. Bezzub, I. Reva, Mobile Power Measuring Complex a Three-Phase Motor with Separation Low-Frequency Vibration Components, 2022 IEEE 3rd KhPI Week on Advanced Technology (KhPIWeek), Kharkiv, Ukraine, 2022, pp. 1-6, doi: 10.1109/KhPIWeek57572.2022.9916435. (Scopus)

O. Todorov, O. Bialobrzheskyi, I. Reva, M. Bezzub, Measurement Monitoring Possibility of 6/10 kV Cable Lines Insulation State on the Instantaneous Power Analysis, 2022 IEEE 4th International Conference on Modern Electrical and Energy System (MEES), Kremenchuk, Ukraine, 2022, pp. 1-5, doi: 10.1109/MEES58014.2022.10005739.

O. Todorov, O. Bialobrzheskyi, M. Bezzub and A. Postil, Detection Changes in Line Insulation Conductivity by High-Frequency Voltage and Current Pulsations Using Wavelet Transform, 2023 IEEE 4th KhPI Week on Advanced Technology (KhPIWeek), Kharkiv, Ukraine, 2023, pp. 1-5, doi: 10.1109/KhPIWeek61412.2023.10312947.

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