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Kane, M., Taylor, N. & Månsson, D. (2024). Investigations Into Conducted Emissions of A 10 kW Photovoltaic Plant. IEEE Letters on Electromagnetic Compatibility Practice and Applications, 6(1), 16-21
Open this publication in new window or tab >>Investigations Into Conducted Emissions of A 10 kW Photovoltaic Plant
2024 (English)In: IEEE Letters on Electromagnetic Compatibility Practice and Applications, E-ISSN 2637-6423, Vol. 6, no 1, p. 16-21Article in journal (Refereed) Published
Abstract [en]

Considering inverter as the source of electromagnetic emission signals in a photovoltaic (PV) plant, a comprehensive set of measurements of conducted emissions at the input and output of the inverter in a 10 kW PV plant are presented. These are particularly relevant on the backdrop of (a) ban of products in the EU market due to non-compliance and (b) the increased switching frequency in the inverters ( 100s of kHz) in near future. Specifically, the common mode (CM) and differential mode (DM) currents and voltages are measured, and their frequency domain behavior is studied. It is suggested that conducted emissions from PV can be classified into three zones: viz., extremely low frequency (ELF) zone, power frequency zone, and switching frequency zone. Important observations from this exercise are measurement of harmonic contents of current with total rated current distortion (TRD), imbalance in the output voltage and low frequency ripples in the DC voltage. Frequency domain behavior of the CM quantities is studied which throws light on important points like relation between input and output CM quantities, relation between CM voltage and CM current.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2024
Keywords
Solar PV, Common mode currents, Conducted emissions, Harmonics, Voltage imbalance
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Energy Systems
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-342788 (URN)10.1109/lemcpa.2024.3359485 (DOI)001181443900006 ()
Funder
Swedish Energy Agency, 51005-1
Note

QC 20240131

Available from: 2024-01-31 Created: 2024-01-31 Last updated: 2024-07-03Bibliographically approved
Cheng, J., Yizhou, Z., Yun, H., Wang, L. & Taylor, N. (2023). A Study of Frequency Domain Reflectometry Technique for High-Voltage Rotating Machine Winding Condition Assessment. Machines, 11(883)
Open this publication in new window or tab >>A Study of Frequency Domain Reflectometry Technique for High-Voltage Rotating Machine Winding Condition Assessment
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2023 (English)In: Machines, E-ISSN 2075-1702, Vol. 11, no 883Article in journal (Refereed) [Artistic work] Published
Abstract [en]

Detecting and locating local degradations at an incipient stage is very important for mission-critical high-voltage rotating machines. One particular challenge in the existing testing techniques is that the characteristic of a local incipient defect is not prominent due to various factors such as averaging with the healthy remainder, attenuation in signal propagation, interference, and varied operating conditions. This paper proposes and investigates the frequency domain reflectometry (FDR) technique based on the scattering parameter measurement. The FDR result presents the object length, wave impedance, and reflections due to impedance discontinuity along the measured windings. Experiments were performed on two commercial coils with artificially created defects. These defects include turn-to-turn short, surface creepage, loose coils, insufficient end-winding spacing, and local overheating, which are commonly seen in practice. Two practical water pumps in the field were also selected for investigation. The study outcome shows that FDR can identify and locate structural and insulation degradation in both shielded and unshielded objects with good sensitivity. This makes FDR a complementary technique for machine fault diagnosis and aging assessment.

Place, publisher, year, edition, pages
MDPI AG, 2023
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-335395 (URN)10.3390/machines11090883 (DOI)001079209100001 ()2-s2.0-85172472288 (Scopus ID)
Note

QC 20231102

Available from: 2023-09-06 Created: 2023-09-06 Last updated: 2023-11-02Bibliographically approved
Habib, M. Z., Duvnjak Zarkovic, S., Taylor, N., Hilber, P. & Shayesteh, E. (2023). Distributed fault-passage indicators versus central fault location: Comparison for reliability centred planning of resonant-earthed distribution systems. Energy Reports, 9, 1731-1742
Open this publication in new window or tab >>Distributed fault-passage indicators versus central fault location: Comparison for reliability centred planning of resonant-earthed distribution systems
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2023 (English)In: Energy Reports, E-ISSN 2352-4847, Vol. 9, p. 1731-1742Article in journal (Refereed) Published
Abstract [en]

Fault location methods are crucial for reducing fault restoration time, and thus improving a network's system average interruption duration index (SAIDI) and customer outage cost. Resonant-earthed systems pose problems for traditional fault location methods, leading to poor accuracy and a need for additional complexity. In this context, methods that detect fault direction (fault-passage indicators, FPI) at multiple points in the network may show advantages over a central distance-estimation method using fault locators (FL) of poor accuracy. This paper includes a comparative study of these two major fault location methods, comparing the reliability benefit from a varied number of FPIs or a central method. The optimal placement of the fault locating devices is found by formulating a mixed-integer linear programming (MILP) optimization approach that minimizes both outage and investment costs and assesses SAIDI. This approach has been tested on an example distribution system. However, to justify the universality of the algorithm, the RBTS reliability test system has also been analysed. The comparison of location methods and placement method of FPIs are useful for reliability centred planning of resonant-earthed distribution systems where fault location is to be used. Results show that a small number of FPIs that give accurate identification of direction may give more cost effective increase in reliability than a distance estimate by FL with typical levels of inaccuracy.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Fault location methods, Distribution system planning, Resonant-earthed system, SAIDI, Mixed-integer programming
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-324053 (URN)10.1016/j.egyr.2022.12.077 (DOI)000919166400001 ()2-s2.0-85145980006 (Scopus ID)
Note

QC 20230222

Available from: 2023-02-22 Created: 2023-02-22 Last updated: 2023-02-22Bibliographically approved
Kane, M., Taylor, N. & Månsson, D. (2023). Experimental Investigations into Common Mode Impedance of PV Panels. In: Proceedings IET Renewable Power Generation and Future Power Systems Conference 2023: . Paper presented at IET Renewable Power Generation and Future Power Systems Conference 2023, 15 - 16 November 2023, Glasgow, UK. Glasgow, UK: Institution of Engineering and Technology (IET)
Open this publication in new window or tab >>Experimental Investigations into Common Mode Impedance of PV Panels
2023 (English)In: Proceedings IET Renewable Power Generation and Future Power Systems Conference 2023, Glasgow, UK: Institution of Engineering and Technology (IET) , 2023Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The nature of common mode (CM) parasitic impedance (ZPV) of photovoltaic (PV) panels is investigated by experimentation. Measurements are done by two methods: (a) time domain signal recording using a signal generator and an oscilloscope (b) frequency sweep using an LCR meter. It is shown that ZPV is not purely capacitive for the frequency range from 50 Hz to 1 MHz.  It is also shown that the total common mode impedance in a PV installation is affected by the nature of ZPV.  The frequency spectrum of CM current would be different if ZPV is not purely capacitive. This would affect the design of CM filters on the DC and AC side and also equipment like PV emulators, DC line impedance stabilization network, etc.

Place, publisher, year, edition, pages
Glasgow, UK: Institution of Engineering and Technology (IET), 2023
Keywords
PV, Solar Energy, EMC, Common mode current
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-340192 (URN)10.1049/icp.2023.3243 (DOI)2-s2.0-85188306248 (Scopus ID)
Conference
IET Renewable Power Generation and Future Power Systems Conference 2023, 15 - 16 November 2023, Glasgow, UK
Projects
PV-related disturbance and safety issues: analysis of risks and mitigation measures" (51005-1)
Funder
Swedish Energy Agency, 51005-1
Note

Part of ISBN 978-1-83953-997-8

QC 20240115

Available from: 2023-11-30 Created: 2023-11-30 Last updated: 2024-07-08Bibliographically approved
Habib, M. Z. & Taylor, N. (2023). Incremental Phase-Current Based Fault Passage Indication for Earth Faults in Resonant Earthed Networks. Electricity, 4(2), 96-113
Open this publication in new window or tab >>Incremental Phase-Current Based Fault Passage Indication for Earth Faults in Resonant Earthed Networks
2023 (English)In: Electricity, E-ISSN 2673-4826, Vol. 4, no 2, p. 96-113Article in journal (Refereed) Published
Abstract [en]

We propose a method for the fault passage indication of earth faults in resonant-earthed networks, based on phase current measurements alone. This is particularly relevant for electricity distribution systems at medium-voltage levels. The method is based on the relative magnitudes of the phasor changes in the phase currents due to the fault. It is tested for various network types and operation configurations by simulating the network in pscad and using the simulated currents as the input for an implementation of the method in matlab. In over-compensated networks, the method shows reliable detection of the fault passage, with good selectivity and sensitivity for both homogeneous and mixed (cable and overhead line) feeders. However, for the less common under-compensated systems, it has limitations that are described further in this study. The method has good potential for being cost effective since it requires only current measurements, from a single location, at a moderate sampling rate.

Place, publisher, year, edition, pages
MDPI AG, 2023
Keywords
arc suppression coil, compensated neutral, earth fault, fault location, fault passage indication (FPI), ground fault, medium voltage, Petersen coil, resonant earthed, resonant grounded
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-336704 (URN)10.3390/electricity4020007 (DOI)001187482100001 ()2-s2.0-85168688474 (Scopus ID)
Note

Not duplicate with DiVA 1712785

QC 20230918

Available from: 2023-09-18 Created: 2023-09-18 Last updated: 2024-04-05Bibliographically approved
Amizhtan, S. K., Sarathi, R., Vinu, R., Edin, H. E. & Taylor, N. (2023). Investigation on Carbon particle formation with Electro-Thermal ageing of Transformer oil. In: ICDL 2023 - 22nd IEEE International Conference on Dielectric Liquids: . Paper presented at 22nd IEEE International Conference on Dielectric Liquids, ICDL 2023, Worcester, United States of America, Jun 25 2023 - Jun 28 2023. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Investigation on Carbon particle formation with Electro-Thermal ageing of Transformer oil
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2023 (English)In: ICDL 2023 - 22nd IEEE International Conference on Dielectric Liquids, Institute of Electrical and Electronics Engineers (IEEE) , 2023Conference paper, Published paper (Refereed)
Abstract [en]

Present work deals with accelerated electrical and thermal stress on transformer oil and its characteristic variation on Fuller's earth (FE) reclamation. The influence of carbon particles in the fluid, its role on thermal ageing characteristics can be understood by electrical characterization. Reclamation of insulation fluid extends the lifetime and reliability of the transformer over the year of operation. The average particle size of carbon particles on electrical breakdown are in the range of 644 nm. Dielectric response spectroscopy (DRS) which identifies the conductivity and relative permittivity variation with the effect multi-stress ageing. Conduction mechanism with higher electric field is simulated by current-voltage (IV) characteristics using non-uniform field configuration to derive the ionic mobility of the liquid. Dissolved decayed products and turbidity showed drastic enhancement with multi-stress ageing than the thermally aged specimen. Reclamation with fuller earth treatment removes the carbon traces and ageing by-products in the fluid regaining its relative dielectric performances. Rheological aspects with viscosity indicates the ageing by-products build and also its characteristic variation on the reclamation process.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2023
Keywords
ageing, carbon, fuller earth, impulse, reclamation
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-336742 (URN)10.1109/ICDL59152.2023.10209319 (DOI)2-s2.0-85169294290 (Scopus ID)
Conference
22nd IEEE International Conference on Dielectric Liquids, ICDL 2023, Worcester, United States of America, Jun 25 2023 - Jun 28 2023
Note

Part of ISBN 9798350302172

QC 20230919

Available from: 2023-09-19 Created: 2023-09-19 Last updated: 2024-01-12Bibliographically approved
Amizhtan, S. K., Sarathi, R., Edin, H. E. & Taylor, N. (2023). Study on Conduction Mechanism in Corrosive Transformer Oil and its Reclamation Properties. IEEE transactions on dielectrics and electrical insulation, 30(5), 2232-2239
Open this publication in new window or tab >>Study on Conduction Mechanism in Corrosive Transformer Oil and its Reclamation Properties
2023 (English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 30, no 5, p. 2232-2239Article in journal (Refereed) Published
Abstract [en]

This work deals with the effect of oil reclamation on the conduction mechanism and dielectric aspects of accelerated thermally aged transformer mineral oil. The reclamation is a treatment with Fuller's earth (FE) adsorbent to remove corrosive sulfur compounds and other contaminants formed during thermal aging. The properties of the oil are compared between different stages of the treatment. Corona (partial discharge) inception is identified by the optical fluorescent fiber technique. The results show an increased corona inception voltage after treatment. Dielectric response spectroscopy (DRS) showed a lower loss factor and electrical conductivity after treatment. The conduction mechanism is measured under uniform and nonuniform electric fields with variations in applied voltage magnitude. The conduction mechanism at a uniform electric field (low E) is studied using the polarity reversal technique to estimate the respective ionic motilities in the fluid. The apparent mobility of ions, conductivity, ionic radius, and concentration from the oil are found to reduce on reclamation. In addition, the conduction mechanism for a higher electric field is simulated by the current-voltage characteristic in nonuniform conditions and the slope determines the ionic mobility of the fluid.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2023
Keywords
Dielectric response spectroscopy (DRS), Fuller's earth (FE), ionic mobility, oil reclamation, power transformer
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-339822 (URN)10.1109/TDEI.2023.3304602 (DOI)001081093700038 ()2-s2.0-85167825591 (Scopus ID)
Note

QC 20231121

Available from: 2023-11-21 Created: 2023-11-21 Last updated: 2024-01-12Bibliographically approved
Hoq, M. T., Wang, J. & Taylor, N. (2022). An Incremental Quantity Based Protection with Capacitor Voltage Estimation for Mid-Line Series Compensation. In: : . Paper presented at 16th International Conference on Developments in Power System Protection (DPSP), Newcastle, United Kingdom, January 2022.. Newcastle, United Kingdom
Open this publication in new window or tab >>An Incremental Quantity Based Protection with Capacitor Voltage Estimation for Mid-Line Series Compensation
2022 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Series capacitors are installed in transmission lines to increase power transfer capacity. However, their addition creates challenges for the line protection. Security and speed of phasor based protection schemes that work with local measurements (communication independent) are severely affected in the presence of series capacitors. Therefore, time-domain based protection methods may be considered as a potential solution for communication independent protection of series compensated lines. In this paper, an incremental quantity based protection scheme is presented for series compensated lines with the capacitor in the middle of the line. The method involves estimating the voltage across the capacitor bank, based on the current in the capacitor bank and metal oxide varistor during faults. Then this capacitor voltage estimation is used to implement the incremental quantity protection. The incremental quantity method consists of fault detection, phase selection, directional discrimination and distance estimation. A PSCAD model of a 500 kV, 200 km transmission line is used to simulate fault cases for evaluating the method. The proposed method is tested with different compensation levels, fault types, fault positions, inception angles, fault resistances and source impedance ratios. The results show that the proposed method can meet the dependability and security demands for the protection of series compensated lines.

Place, publisher, year, edition, pages
Newcastle, United Kingdom: , 2022
Keywords
SERIES COMPENSATION, TIME DOMAIN PROTECTION, INCREMENTAL QUANTITY
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-311746 (URN)
Conference
16th International Conference on Developments in Power System Protection (DPSP), Newcastle, United Kingdom, January 2022.
Funder
SweGRIDS - Swedish Centre for Smart Grids and Energy Storage, FPS12
Note

QC 20220509

Available from: 2022-05-03 Created: 2022-05-03 Last updated: 2023-12-27Bibliographically approved
Hoq, M. T., Wang, J. & Taylor, N. (2022). An Incremental Quantity Based Protection With Capacitor Voltage Estimation For Mid-Line Series Compensation. In: : . Paper presented at 16th International Conference on Developments in Power System Protection, DPSP 2022, Newcastle, Virtual, United Kingdom of Great Britain and Northern Ireland, Mar 7 2022 - Mar 10 2022 (pp. 291-296). Institution of Engineering and Technology (IET)
Open this publication in new window or tab >>An Incremental Quantity Based Protection With Capacitor Voltage Estimation For Mid-Line Series Compensation
2022 (English)Conference paper, Published paper (Other academic)
Abstract [en]

Series capacitors are installed in transmission lines to increase power transfer capacity. However, their addition creates challenges for the line protection. Security and speed of phasor based protection schemes that work with local measurements (communication independent) are severely affected in the presence of series capacitors. Therefore, time-domain based protection methods may be considered as a potential solution for communication independent protection of series compensated lines. In this paper, an incremental quantity based protection scheme is presented for series compensated lines with the capacitor in the middle of the line. The method involves estimating the voltage across the capacitor bank, based on the current in the capacitor bank and metal oxide varistor during faults. Then this capacitor voltage estimation is used to implement the incremental quantity protection. The incremental quantity method consists of fault detection, phase selection, directional discrimination and distance estimation. A PSCAD model of a 500 kV, 200 km transmission line is used to simulate fault cases for evaluating the method. The proposed method is tested with different compensation levels, fault types, fault positions, inception angles, fault resistances and source impedance ratios. The results show that the proposed method can meet the dependability and security demands for the protection of series compensated lines.

Place, publisher, year, edition, pages
Institution of Engineering and Technology (IET), 2022
Keywords
INCREMENTAL QUANTITY, SERIES COMPENSATION, TIME DOMAIN PROTECTION
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-350099 (URN)10.1049/icp.2022.0955 (DOI)2-s2.0-85161076957 (Scopus ID)
Conference
16th International Conference on Developments in Power System Protection, DPSP 2022, Newcastle, Virtual, United Kingdom of Great Britain and Northern Ireland, Mar 7 2022 - Mar 10 2022
Note

Part of ISBN [9781839537196]

QC 20240706

Available from: 2024-07-06 Created: 2024-07-06 Last updated: 2024-07-06Bibliographically approved
Kane, M., Taylor, N. & Månsson, D. (2022). Characterization of Parasitic Impedances of PV Panels from Common Mode Perspective. In: 2022 International Symposium on Electromagnetic Compatibility – EMC Europe, 2022: . Paper presented at 2022 International Symposium on Electromagnetic Compatibility – EMC Europe, September 5-8, 2022. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Characterization of Parasitic Impedances of PV Panels from Common Mode Perspective
2022 (English)In: 2022 International Symposium on Electromagnetic Compatibility – EMC Europe, 2022, Institute of Electrical and Electronics Engineers (IEEE), 2022Conference paper, Published paper (Refereed)
Abstract [en]

Parasitic impedances of PV panels play an important role in the common mode circuit. This work has investigated parasitic impedance model including capacitances and inductances, against the one with only capacitances considered in the literature. Further, the effects of geometrical and environmental factors on the parasitic capacitances are analysed using Finite Element Method (FEM) and Design of Experiments (DoE). The analysis has revealed that the water layer above panels is significant for cell-to-frame capacitance and not for cell-to-ground capacitance. Frequency domain analysis of total parasitic impedances is presented which shows that the total impedance exhibits resonances and inductive behaviour in the MHz range. These features are not captured if only capacitive model is considered.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2022
Keywords
Frequency-domain analysis, Design methodology, Europe, Capacitance, Electromagnetic compatibility, Environmental factors, Finite element analysis
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-320514 (URN)10.1109/EMCEurope51680.2022.9901119 (DOI)000885912100102 ()2-s2.0-85140257363 (Scopus ID)
Conference
2022 International Symposium on Electromagnetic Compatibility – EMC Europe, September 5-8, 2022
Funder
Swedish Energy Agency, 51005-1
Note

Part of proceedings: ISBN 978-1-6654-0788-5

QCR 20221025

Available from: 2022-10-24 Created: 2022-10-24 Last updated: 2022-12-02Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0759-4406

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