Kari Lappalainen

Latest publications

• Identification of photovoltaic module ageing from symmetrically and asymmetrically cut current–voltage curves

  Kalliojärvi, H. & Lappalainen, K., Mar 2026, In: Solar Energy Materials and Solar Cells. 296, 15 p., 114081 .

  Research output: Contribution to journal › Article › Scientific › peer-review

• Comparison of ramp-rate-based energy storage system control methods for power smoothing of PV systems

  Talvi, M. & Lappalainen, K., 2025, Automaatiopäivät 2025 - Automation Days 2025 Extended Abstracts. Hästbacka, D. & Sierla, S. (eds.). Suomen Automaatioseura, p. 90-93 (Julkaisusarja (Suomen automaatioseura ry)).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Professional

• Dependence of Photovoltaic Module Performance Indicators on Operating Temperature and Irradiance

  Kalliojärvi, H. & Lappalainen, K., 2025, 42nd European Photovoltaic Solar Energy Conference and Exhibition. EU PVSEC, 7 p. (Proceedings (EU PVSEC)).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

• Effects of the Operating Point of Photovoltaic Strings on Sizing of DC- and AC-Connected Energy Storage Systems for Power Smoothing

  Lappalainen, K., 2025, In: Advanced Energy and Sustainability Research. 6, 10, 12 p., 2400199.

  Research output: Contribution to journal › Article › Scientific › peer-review

• Energiamurroksen vaikutukset sähkönkulutukseen ja -tuotantoon suomalaisissa jakeluverkoissa

  Aaltonen, L. & Lappalainen, K., 2025, Automaatiopäivät 2025 - Automation Days 2025 Extended Abstracts. Hästbacka, D. & Sierla, S. (eds.). Suomen Automaatioseura, p. 3-6 (Julkaisusarja (Suomen automaatioseura ry)).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Professional

• Estimating Photovoltaic Power Ramp Rates Using Single Point Irradiance Measurement

  Talvi, M., Kleissl, J. & Lappalainen, K., 2025, 42nd European Photovoltaic Solar Energy Conference and Exhibition. EU PVSEC, 7 p. (Proceedings (EU PVSEC)).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

• Influence of the temperature on the intrinsic parameters of thin-film photovoltaic modules

  Piliougine, M., Garcia-Marrero, L. E., Lappalainen, K. & Spagnuolo, G., 15 Feb 2025, In: Renewable Energy. 240, 20 p., 122068 .

  Research output: Contribution to journal › Article › Scientific › peer-review

• Methods for online identification of photovoltaic module ageing by series resistance from measured current–voltage curves

  Kalliojärvi, H. & Lappalainen, K., Jun 2025, In: Energy Reports. 13, p. 1558-1570

  Research output: Contribution to journal › Article › Scientific › peer-review

• Photovoltaic Hosting Capacity in Nordic Distribution Grids

  Aaltonen, L. & Lappalainen, K., 2025, 42nd European Photovoltaic Solar Energy Conference and Exhibition. EU PVSEC, 5 p. (Proceedings (EU PVSEC)).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

• Photovoltaic Modules Single-Diode Model Parametric Identification by Means of Implicit and Explicit Approaches

  Lappalainen, K., Piliougine, M. & Spagnuolo, G., 2025, ELECTRIMACS 2024 - Selected Papers. Belenguer, E. & Beltran, H. (eds.). Springer, p. 601-614 14 p. (Lecture Notes in Electrical Engineering; vol. 1275).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review