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Publications (10 of 10) 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
Busatto, T., Larsson, A., Rönnberg, S. & Bollen, M. (2019). Including Uncertainties from Customer Connections in Calculating Low-Voltage Harmonic Impedance. IEEE Transactions on Power Delivery, 34(2), 606-615
Open this publication in new window or tab >>Including Uncertainties from Customer Connections in Calculating Low-Voltage Harmonic Impedance
2019 (English)In: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 34, no 2, p. 606-615Article in journal (Refereed) Published
Abstract [en]

A method is proposed in this paper to determine the harmonic impedances in low-voltage networks in a stochastic way. The consequences of resonances for harmonic propagation and stability of power converters are summarized. By using Monte Carlo simulation, the method includes the uncertainties in customer impedances, specifically due to electronic loads and local generation. The uncertainty in customer impedance is included by considering probability distribution for the resistive, inductive and capacitive parts of the impedance. The concept of transfer impedance is used for phase-to-neutral connections. A method is developed and applied to two existing low-voltage networks in Sweden. Results show that, for these two networks, the resonant frequencies decrease around 28 % once PV panels are installed. The paper includes a discussion of some of the practical aspects of applying the proposed method.

Place, publisher, year, edition, pages
IEEE, 2019
Keywords
Power Quality, power system harmonics, resonance, stochastic processes, Monte Carlo methods
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-72659 (URN)10.1109/TPWRD.2018.2881222 (DOI)000462414900022 ()
Funder
Swedish Energy Agency
Note

Validerad;2019;Nivå 2;2019-04-11 (oliekm)

Available from: 2019-01-23 Created: 2019-01-23 Last updated: 2019-04-24Bibliographically 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
Schwanz, D., Busatto, T., Bollen, M. & Larsson, A. (2018). A stochastic study of harmonic voltage distortion considering single-phase photovoltaic inverters. 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 >>A stochastic study of harmonic voltage distortion considering single-phase photovoltaic inverters
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]

In this paper, the hosting capacity considering harmonic distortion is estimated for single-phase-connected photovoltaic inverters (PVIs) in low-voltage distribution networks. A stochastic approach is used to calculate the harmonic voltage distortion with each customer in the network. The method has been applied to a 6-customer network for the connection of 2.5-kW single-phase PVIs with and without harmonic voltage background. From the results, it was observed that the contribution from 2.5 kW single-phase photovoltaic inverters to the individual harmonic distortion will not cause the established limits to be exceeded. Also, that the harmonic voltage background is often dominating and should be continuously observed.

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
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-69529 (URN)10.1109/ICHQP.2018.8378889 (DOI)000444771900078 ()2-s2.0-85049249086 (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: 2018-06-14 Created: 2018-06-14 Last updated: 2018-10-10Bibliographically approved
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
Busatto, T., Larsson, A., Rönnberg, S. & Bollen, M. (2017). Supraharmonics Emission Assessment of Multi-level Converters Applied for Photovoltaic Grid-Connected Inverters. Paper presented at International Conference on Renewable Energies and Power Quality (ICREPQ’17), Malaga, Spain, 4-6 April 2017. The Renewable Energies and Power Quality Journal (RE&PQJ), 1(15), 143-148, Article ID 252.
Open this publication in new window or tab >>Supraharmonics Emission Assessment of Multi-level Converters Applied for Photovoltaic Grid-Connected Inverters
2017 (English)In: The Renewable Energies and Power Quality Journal (RE&PQJ), ISSN 2172-038X, E-ISSN 2172-038X, Vol. 1, no 15, p. 143-148, article id 252Article in journal, Meeting abstract (Refereed) Published
Place, publisher, year, edition, pages
Spain: EA4EPQ-European Association for the Development of Renewable Energy, Environment and Power Quality, 2017
Keywords
Supraharmonics, power electronics, power quality, photovoltaic inverter, multi-level converters.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-66728 (URN)10.24084/repqj15.252 (DOI)
Conference
International Conference on Renewable Energies and Power Quality (ICREPQ’17), Malaga, Spain, 4-6 April 2017
Funder
Swedish Energy Agency, LTU-24541
Available from: 2017-11-23 Created: 2017-11-23 Last updated: 2018-12-14Bibliographically approved
Busatto, T., Abid, F., Larsson, A., Bollen, M. & Singh, G. (2016). Interaction between Grid-Connected PV systems and LED Lamps: Directions for Further Research on Harmonics and Supraharmonics. In: 2016 17th International Conference on Harmonics and Quality of Power: . Paper presented at 17th International Conference on Harmonics and Quality of Power (ICHQP), Belo Horizonte, Brasil, 16-19 October 2016 (pp. 193-197). Piscataway, NJ, Article ID 7783479.
Open this publication in new window or tab >>Interaction between Grid-Connected PV systems and LED Lamps: Directions for Further Research on Harmonics and Supraharmonics
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2016 (English)In: 2016 17th International Conference on Harmonics and Quality of Power, Piscataway, NJ, 2016, p. 193-197, article id 7783479Conference paper, Published paper (Refereed)
Abstract [en]

This paper discusses different approaches to investigate the interaction through harmonics, interharmonics, supraharmonics, and light flicker, between photovoltaic (PV) inverters and LED lamps in low-voltage installations. Single grid-connected power generators and electronic loads like LED lamps can be easily characterized in terms of harmonics in a given range of frequency. This subject is relatively well understood, and specific standards for measuring and restricting emissions are already established to ensure a low probability of interference. However, when connected together, source and load exhibit behavior that requires further study and understanding. This work presents a discussion serving as a guide for future work on analysis of losses and other impacts of the disturbances regarding this specific load and source interaction. The following are taken into account: the nonlinearity of LED loads and PV converters; the technologies and methods used in control; and the changes in power flow caused by load and power production variations

Place, publisher, year, edition, pages
Piscataway, NJ: , 2016
Series
International Conference on Harmonics and Quality of Power, ISSN 1540-6008
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-60517 (URN)10.1109/ICHQP.2016.7783479 (DOI)000391424200034 ()2-s2.0-85009461568 (Scopus ID)9781509037926 (ISBN)
Conference
17th International Conference on Harmonics and Quality of Power (ICHQP), Belo Horizonte, Brasil, 16-19 October 2016
Available from: 2016-11-17 Created: 2016-11-17 Last updated: 2018-06-14Bibliographically approved
Abid, F., Busatto, T., Rönnberg, S. & Bollen, M. (2016). Intermodulation due to interaction of photovoltaic inverter and electric vehicle at supraharmonic range. In: 2016 17th International Conference on Harmonics and Quality of Power: . Paper presented at 17th International Conference on Harmonics and Quality of Power (ICHQP), Belo Horizonte, Brasil, 16-19 October 2016 (pp. 685-690). Piscataway. NJ, Article ID 7783471.
Open this publication in new window or tab >>Intermodulation due to interaction of photovoltaic inverter and electric vehicle at supraharmonic range
2016 (English)In: 2016 17th International Conference on Harmonics and Quality of Power, Piscataway. NJ, 2016, p. 685-690, article id 7783471Conference paper, Published paper (Refereed)
Abstract [en]

Advent of power electronic switching is introducing more and more non-linear loads in the low voltage grid. Besides harmonic current generation in the frequency range below 2 kHz, these non-linear loads are also responsible for current emission in the range of 2 kHz to 150 kHz, commonly known as supraharmonic emission. Supraharmonic currents mainly flow between nearby appliances and heavily influence the overall emission of neighboring devices. This paper presents an analysis of supraharmonic interaction between a photovoltaic inverter and an electric vehicle. It has been noticed that intermodulation distortion arises as a result of interaction between different switching frequencies used by the devices. Later, additional household equipment were added to photovoltaic and electric vehicle to observe their effect on intermodulation distortion. All the measurements were conducted in a controlled laboratory environment imitating a domestic customer.

Place, publisher, year, edition, pages
Piscataway. NJ: , 2016
Series
International Conference on Harmonics and Quality of Power, ISSN 1540-6008
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-60515 (URN)10.1109/ICHQP.2016.7783471 (DOI)000391424200119 ()2-s2.0-85009446573 (Scopus ID)9781509037926 (ISBN)
Conference
17th International Conference on Harmonics and Quality of Power (ICHQP), Belo Horizonte, Brasil, 16-19 October 2016
Available from: 2016-11-17 Created: 2016-11-17 Last updated: 2018-06-12Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-4079-4776

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