Grid integration and a power quality assessment of a wave-energy park
Artikel i vetenskaplig tidskrift, 2019

This study presents a step toward the grid connection of a wave-energy park through an electric power conversion system (EPCS) developed and installed for the wave-energy harvesting in Lysekil, Sweden. The EPCS comprises a rectifier, a DC bus, and an inverter followed by a harmonic filter (HF). The higher- and lower-order harmonics injected by the inverter in a power quality context are investigated. The lower-order voltage harmonics partially distort the voltage-source inverter output grid current. A phase-locked loop-based (PLL) grid-phase tracking is used to attenuate the lower-order harmonics by reflecting the grid harmonics in the inverter output. An expression for the grid-current harmonics as a function of the grid-voltage harmonics has been derived and implemented. A mathematical model is derived to obtain a transfer function for the PLL, and finally, proportional–integral gains are tuned for stable system operation. An HF for mitigating the higher-order harmonics has been implemented. The total harmonic distortion is evaluated experimentally, and the results fulfil the grid-code requirements at various frequencies and harmonic orders.


Wave energy

Aircraft launching devices


Arvind Parwal

Uppsala universitet

Martin Fregelius

Uppsala universitet

Jennifer Leijon

Uppsala universitet

Maria Chatzigiannakou

Uppsala universitet

Olle Svensson

Uppsala universitet

Erland Strömstedt

Uppsala universitet

Irina Temiz

Uppsala universitet

Janaina G. De Oliveira

Universidade Federal de Juiz de Fora

Uppsala universitet

Cecilia Boström

Division of Electricity

Mats Leijon

Uppsala universitet

Chalmers, Elektroteknik, Elkraftteknik

IET Smart Grid

25152947 (eISSN)

Vol. 2 4 625-634


Övrig annan teknik

Annan elektroteknik och elektronik



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