Tampere University of Technology

TUTCRIS Research Portal

Kari Lappalainen

  1. 2019
  2. Published

    Fluctuation of PV array global maximum power point voltage during irradiance transitions caused by clouds

    Lappalainen, K. & Valkealahti, S., 18 Nov 2019, In : IET Renewable Power Generation. 13, 15, p. 2864-2870 7 p.

    Research output: Contribution to journalArticleScientificpeer-review

  3. Published

    Photovoltaic Module Parametric Identification

    Spagnuolo, G., Lappalainen, K., Valkealahti, S. & Manganiello, P., 4 Nov 2019, 2019 International Conference on Clean Electrical Power (ICCEP). IEEE, p. 302-305 4 p. (International Conference on Clean Electrical Power).

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  4. Published

    Identification and Diagnosis of a Photovoltaic Module Based on Outdoor Measurements

    Spagnuolo, G., Lappalainen, K., Valkealahti, S. & Manganiello, P., 2019, 2019 IEEE Milan PowerTech. IEEE, 6 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  5. 2018
  6. Published

    Cloud Enhancement Phenomenon and its Effect on PV Generators

    Järvelä, M., Lappalainen, K. & Valkealahti, S., 25 Sep 2018, 35th European Photovoltaic Solar Energy Conference and Exhibition (35th EU PVSEC), 24–28 September, 2018, Brussels, Belgium. p. 1964-1968

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  7. Published

    Size of a Basic Simulation Unit in PV System Partial Shading Studies

    Lappalainen, K. & Valkealahti, S., 2018, 35th European Photovoltaic Solar Energy Conference and Exhibition (35th EU PVSEC), 24–28 September, 2018, Brussels, Belgium. p. 1647-1651 5 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  8. Published

    Smoothing of Output Power Variation with Increasing PV Array Size

    Lappalainen, K. & Valkealahti, S., 2018, IEEE PES Innovative Smart Grid Technologies 2018 Asia Conference, Singapore. IEEE, p. 190-195 6 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  9. 2017
  10. Published

    Number of MPPs in PV Generators during Irradiance Transitions Caused by Moving Clouds

    Lappalainen, K. & Valkealahti, S., 7 Dec 2017, IEEE PES Innovative Smart Grid Technologies 2017 Asia Conference, Auckland, New Zealand. Auckland, New Zealand: IEEE, 7 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  11. Published

    Output Power Variation and Mismatch Losses of Photovoltaic Power Generators Caused by Moving Clouds

    Lappalainen, K., 17 Nov 2017, Tampere University of Technology. 116 p. (Tampere University of Technology. Publication; vol. 1506)

    Research output: Book/ReportDoctoral thesisMonograph

  12. Published

    Output power variation of different PV array configurations during irradiance transitions caused by moving clouds

    Lappalainen, K. & Valkealahti, S., 15 Mar 2017, In : Applied Energy. 190, p. 902-910 9 p.

    Research output: Contribution to journalArticleScientificpeer-review

  13. Published

    Effects of PV array layout, electrical configuration and geographic orientation on mismatch losses caused by moving clouds

    Lappalainen, K. & Valkealahti, S., 1 Mar 2017, In : Solar Energy. 144, p. 548-555 8 p.

    Research output: Contribution to journalArticleScientificpeer-review

  14. Published

    Effects of irradiance transition characteristics on the mismatch losses of different electrical PV array configurations

    Lappalainen, K. & Valkealahti, S., 2017, In : IET Renewable Power Generation. 11, 2, p. 248-254

    Research output: Contribution to journalArticleScientificpeer-review

  15. Published

    Photovoltaic mismatch losses caused by moving clouds

    Lappalainen, K. & Valkealahti, S., 2017, In : Solar Energy. 158, p. 455-461 7 p.

    Research output: Contribution to journalArticleScientificpeer-review

  16. Published

    Simulation Resolution of PV System Partial Shading Studies

    Lappalainen, K. & Valkealahti, S., 2017, 33rd European Photovoltaic Solar Energy Conference and Exhibition (33rd EU PVSEC), 25–29 September, 2017, Amsterdam, The Netherlands. p. 1973-1977 5 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  17. 2016
  18. Published

    Apparent velocity of shadow edges caused by moving clouds

    Lappalainen, K. & Valkealahti, S., 15 Nov 2016, In : Solar Energy. 138, p. 47-52 6 p.

    Research output: Contribution to journalArticleScientificpeer-review

  19. Published

    Effects of irradiance transitions on the output power fluctuations of different PV array configurations

    Lappalainen, K. & Valkealahti, S., Nov 2016, 2016 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia). IEEE, p. 705-711 7 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  20. Published

    Analysis of shading periods caused by moving clouds

    Lappalainen, K. & Valkealahti, S., 1 Oct 2016, In : Solar Energy. 135, p. 188-196 9 p.

    Research output: Contribution to journalArticleScientificpeer-review

  21. Published

    Mathematical Parametrisation of Irradiance Transitions Caused by Moving Clouds for PV System Analysis

    Lappalainen, K. & Valkealahti, S., 2016, 32nd European Photovoltaic Solar Energy Conference and Exhibition (32nd EU PVSEC), 20–24 June, 2016, Munich, Germany . p. 1485-1489 5 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  22. 2015
  23. Published

    Recognition of shading events caused by moving clouds and determination of shadow velocity from solar radiation measurements

    Lappalainen, K. & Valkealahti, S., 14 Sep 2015, 31st European Photovoltaic Solar Energy Conference and Exhibition (31st EU PVSEC), 14– 18 September, 2015, Hamburg, Germany . p. 1568-1573 6 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  24. Published

    Recognition and modelling of irradiance transitions caused by moving clouds

    Lappalainen, K. & Valkealahti, S., Feb 2015, In : Solar Energy. 112, p. 55-67 13 p.

    Research output: Contribution to journalArticleScientificpeer-review

  25. 2014
  26. Published

    Aurinkokennoista saadaan paras tuotto kirkkaalla, kylmällä säällä

    Lappalainen, K., 2014, In : Sähköala. 1-2, p. 40-42 3 p.

    Research output: Contribution to journalArticleProfessional

  27. Published

    Recognition of irradiance transitions caused by moving clouds harmful to the operation of PV systems

    Lappalainen, K. & Valkealahti, S., 2014, 29th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2014, Proceedings of the international Conference, September 22 - September 26, 2014, Amsterdam, The Netherlands. Bokhoven, T. P., Jäger-Waldau, A. & Helm, P. (eds.). Munich, Germany: WIP, p. 2650-2653 4 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  28. Published

    Sizing energy storage to be used in parallel with grid connected PV inverters to balance the output power fluctuations due to varying insolation

    Reaz Sunny, M., Lappalainen, K. & Valkealahti, S., 2014, Proceedings of the 29th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC, September 22 - September 26, 2014, Amsterdam, The Netherlands. Bokhoven, T. P., Jäger-Waldau, A. & Helm, P. (eds.). Munich, Germany: WIP, p. 2880-2883 4 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  29. 2013
  30. Published

    Effects of the Sharpness of Shadows on the Mismatch Losses of PV Generators under Partial Shading Conditions Caused by Moving Clouds

    Lappalainen, K., Mäki, A. & Valkealahti, S., 2013, 28th European Photovoltaic Solar Energy Conference and Exhibition, 30 September - 4 October 2013, Paris. p. 4081-4086 6 p. (European Photovoltaic Solar Energy Conference).

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  31. Published

    Effects of the Size of PV Arrays on Mismatch Losses under Partial Shading Conditions Caused by Moving Clouds

    Lappalainen, K., Mäki, A. & Valkealahti, S., 2013, 28th European Photovoltaic Solar Energy Conference and Exhibition, 30 September - 4 October 2013, Paris. p. 4071-4076 6 p. (European Photovoltaic Solar Energy Conference).

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

  32. Published

    Operation of TUT Solar PV Power Station Research Plant under Partial Shading Caused by Snow and Buildings

    Lobera, D. T., Mäki, A., Huusari, J., Lappalainen, K., Suntio, T. & Valkealahti, S., 2013, In : International Journal of Photoenergy. 2013, p. 1-13 13 p., 837310.

    Research output: Contribution to journalArticleScientificpeer-review

ID: 69906