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Publications (6 of 6) Show all publications
Ravindran, V., Busatto, T., Rönnberg, S., Bollen, M. & Meyer, J. (2019). Charactizations of interactions between PV and Energy efficient lighting (LED) in a mixed installation.. In: : . Paper presented at CIRED 2019, 25th International Conference on Electricity Distribution Madrid, 3-6 June 2019 (pp. 1-5). , -, Article ID 237.
Open this publication in new window or tab >>Charactizations of interactions between PV and Energy efficient lighting (LED) in a mixed installation.
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2019 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The possible interactions between grid-tied powerelectronicbased PV systems and energy efficient LEDlighting systems in terms of current and voltage, fordifferent combinations of the inverter and LED lamp typesunder different grid conditions, are studied in a laboratoryenvironment. In this paper, the interactions arecharacterized in terms of the power quality disturbanceslike harmonics, interharmonics, supraharmonics,overvoltage, undervoltage, and rapid voltage changes.

Keywords
LED PV interactions harmonics supraharmonics interharmonics
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Energy Engineering Signal Processing
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-73887 (URN)
Conference
CIRED 2019, 25th International Conference on Electricity Distribution Madrid, 3-6 June 2019
Available from: 2019-05-09 Created: 2019-05-09 Last updated: 2019-05-20
Ravindran, V., Busatto, T., Rönnberg, S. & Bollen, M. (2019). Comparison of a non-parametric and parametric method for interharmonic estimation in PV systems. In: : . Paper presented at 13th IEEE PowerTech 2019.
Open this publication in new window or tab >>Comparison of a non-parametric and parametric method for interharmonic estimation in PV systems
2019 (English)Conference paper, Published paper (Refereed)
Abstract [en]

A comparative analysis of ‘Desynchronized processing technique’ (non-parametric) and ‘Sliding window ESPRIT method’ (parametric) for interharmonic estimation in PV systems is carried out. Both methods were applied to field measurements and semi-measured signals to test their feasibility under different conditions. In Desynchronized processing technique, in the second stage of estimation, a Short-term Fourier transform was used to address the time-varying nature of interharmonics. In Sliding window ESPRIT method, the signal subspace dimension was fixed in all analysed cases. An adaptive algorithm was used to find the best rank of the Hankel matrix and apt order of the filter to ensure stability. A set of critical parameters affecting the performance of these methods in interharmonic estimation are identified. This paper emphasizes the significance of using appropriate methods for accurate interharmonic estimation and also demonstrates through the illustrated results that different inferences can be drawn for the same measurements analysed using different methods.

Keywords
Interharmonics, power system measurements, time-frequency analysis, Photovoltaic systems, Power quality.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-73360 (URN)
Conference
13th IEEE PowerTech 2019
Funder
Swedish Energy Agency
Available from: 2019-03-29 Created: 2019-03-29 Last updated: 2019-05-20
Ravindran, V., Rönnberg, S. & Bollen, M. (2019). Interharmonics in PV systems: A Review of analysis and estimation methods; considerations for selection of an apt method. IET Renewable Power Generation, 13(12), 2023-2032
Open this publication in new window or tab >>Interharmonics in PV systems: A Review of analysis and estimation methods; considerations for selection of an apt method
2019 (English)In: IET Renewable Power Generation, ISSN 1752-1416, E-ISSN 1752-1424, Vol. 13, no 12, p. 2023-2032Article, review/survey (Refereed) Published
Abstract [en]

A comprehensive reviewing of existing interharmonic analysis and estimation methodologies irrespective of application is carried out. The paper is enlisting the characteristics of an appropriate method to analyse and estimate interharmonics in PV systems, and linking these characteristics with the features of the reviewed methodologies. The distinctive characteristics of interharmonic emissions related to PV systems are therefore presented. The various methodologies are classified, summarized, and a checklist is prepared to emphasize the areas to be paid attention to while establishing an apt method for interharmonic analysis in PV systems. The priorities for selection of a method by a practicing engineer vary case by case. This paper will serve as a guideline for selection and further development of a suitable method for interharmonic analysis in a PV included power system.

Place, publisher, year, edition, pages
Stevenage, UK: Institution of Engineering and Technology, 2019
Keywords
Interharmonics, Photovoltaic systems, methods
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-74442 (URN)10.1049/iet-rpg.2018.5697 (DOI)000482441200001 ()
Funder
Swedish Energy Agency
Note

Validerad;2019;Nivå 2;2019-09-13 (johcin)

Available from: 2019-06-12 Created: 2019-06-12 Last updated: 2019-09-13Bibliographically approved
Ravindran, V., Busatto, T., Rönnberg, S., Meyer, J. & Bollen, M. (2019). Time-varying interharmonics in different types of grid-tied PV inverter systems. IEEE Transactions on Power Delivery
Open this publication in new window or tab >>Time-varying interharmonics in different types of grid-tied PV inverter systems
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2019 (English)In: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208Article in journal (Refereed) Epub ahead of print
Abstract [en]

Widely existing circuit topologies and inverter control strategies for PV systems allow customer flexibility but also introduce different kinds of interharmonics into the grid. A complete understanding of interharmonics from PV systems, with reasons behind their origin, remains needed. In addition, the timevarying nature of interharmonics and the potential impacts on other equipment are yet to be understood. In this paper, laboratory and field measurements are presented of seven different inverter types at multiple locations. A comprehensive analysis is performed to understand the existence, persistence, and propagation of interharmonics in PV systems on the DC side as well as grid side for different power levels. The origins of the interharmonics are established with experimental evidence and through a comparative analysis. A rural low voltage 6 customer network, with two different impedance profiles caused by the installation of PV, is considered to show the potential impact on customer voltage. To address the time-varying nature of interharmonics, a sliding window ESPRIT method is preferred over FFT based methods

Place, publisher, year, edition, pages
IEEE, 2019
Keywords
— Interharmonics, Islanding, Maximum power point tracking, Power quality, Photovoltaic systems, Reactive power control
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-73359 (URN)10.1109/TPWRD.2019.2906995 (DOI)
Funder
Swedish Energy Agency
Available from: 2019-03-29 Created: 2019-03-29 Last updated: 2019-05-15
Busatto, T., Ravindran, V., Larsson, A. & Bollen, M. (2018). Estimation of the Consumer Electronics Capacitance for Harmonic Resonance Studies by a Non-Invasive Measurement Method. In: Proceedings of International Conference on Harmonics and Quality of Power, ICHQP: . Paper presented at 18th International Conference on Harmonics and Quality of Power (ICHQP 2018), Ljubljana, Slovenia, May 13–16 2018. Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Estimation of the Consumer Electronics Capacitance for Harmonic Resonance Studies by a Non-Invasive Measurement Method
2018 (English)In: Proceedings of International Conference on Harmonics and Quality of Power, ICHQP, Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2018, , p. 6Conference paper, Published paper (Refereed)
Abstract [en]

Harmonic resonances in distribution systems are mainly between network inductances and shunt capacitances from capacitor banks and consumer loads. In this paper, particular attention is devoted to the evaluation of capacitances from domestic equipment, serving as a reference for resonance frequency studies. The assessment is performed by simulation and measurements of common low power electronic loads. From the analysis of EMI filters topologies used in AC/DC converters, a non-invasive capacitance measurement estimation method is presented. The method is verified after correlating capacitances with the resonance frequencies obtained from a frequency sweep method. From experimental measurements, the results show that the equivalent shunt capacitances for a set of 24 LED lamps are between 10 and 135 nF.

Place, publisher, year, edition, pages
Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2018. p. 6
Series
International Conference on Harmonics and Quality of Power, E-ISSN 1540-6008
Keywords
Impedance measurement, power system harmonics, device modeling, AC-DC power converters, low-voltage networks, power quality.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-66734 (URN)10.1109/ICHQP.2018.8378869 (DOI)000444771900058 ()2-s2.0-85049239631 (Scopus ID)978-1-5386-0517-2 (ISBN)
Conference
18th International Conference on Harmonics and Quality of Power (ICHQP 2018), Ljubljana, Slovenia, May 13–16 2018
Funder
Swedish Energy Agency, LTU-24541
Available from: 2017-11-23 Created: 2017-11-23 Last updated: 2019-05-15Bibliographically approved
Ravindran, V., Rönnberg, S., Busatto, T. & Bollen, M. (2018). Inspection of Interharmonic emissions from a Grid-tied PV Inverter in North Sweden. In: Proceedings of International Conference on Harmonics and Quality of Power, ICHQP: . Paper presented at 18th International Conference on Harmonics and Quality of Power (ICHQP 2018), Ljubljana, Slovenia, May 13–16 2018. Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Inspection of Interharmonic emissions from a Grid-tied PV Inverter in North Sweden
2018 (English)In: Proceedings of International Conference on Harmonics and Quality of Power, ICHQP, Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2018Conference paper, Published paper (Refereed)
Abstract [en]

The main objective of the paper is to investigate theexistence of interharmonic emissions from an MPPT drivengrid-connected PV inverter, identify their severity andpersistence. The presence of interharmonics in the measuredcurrent from a PV installation is linked to direct and diffusedsolar irradiation as well as a high ramping rate of theirradiation causing variations in both active and reactive power.The paper sets forth a set of observations and inferences, whichis an appendage to the ongoing research on the power qualityaspects of solar power. Three different case studies areevaluated in detail using signal processing tools like STFT andFFT.

Place, publisher, year, edition, pages
Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2018
Series
International Conference on Harmonics and Quality of Power, E-ISSN 1540-6008
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-68630 (URN)10.1109/ICHQP.2018.8378887 (DOI)000444771900076 ()2-s2.0-85049251669 (Scopus ID)978-1-5386-0517-2 (ISBN)
Conference
18th International Conference on Harmonics and Quality of Power (ICHQP 2018), Ljubljana, Slovenia, May 13–16 2018
Available from: 2018-05-04 Created: 2018-05-04 Last updated: 2019-05-15Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-3587-7879

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