The Assessment of Overvoltage Protection Within Energization of Offshore Wind Farms

Soloot, Amir Hayati; Høidalen, Hans Kristian; Gustavsen, Bjørn

doi:10.1016/j.egypro.2012.06.096

Cited by 10 publications

(1 citation statement)

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“…Therefore, the motivation of this paper is investigating these overvoltages, which are harmful for both transformer and power converters. The resonant overvoltages can occur both due to energization transients and close‐up short circuits, when the frequency of a sustained voltage oscillation at the transformer MV terminals matches with a resonant frequency in the WTT voltage transfer function. The frequency of such oscillations is closely linked to the topology and lengths of the cables.…”

Section: Introductionmentioning

confidence: 99%

Resonant overvoltage assessment in offshore wind farms via a parametric black-box wind turbine transformer model

2014

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The protection of offshore wind farms (OWFs) against overvoltages, especially resonant overvoltage, is of paramount importance because of poor accessibility and high repair costs. In this paper, we study how switching overvoltages at the wind turbine transformer (WTT) medium voltage (MV) side can lead to high overvoltages on the low voltage (LV) side. The effect of overvoltage protective devices is analyzed. A detailed model of an OWF row is developed in electromagnetic transients program–alternative transients program (EMTP‐ATP), including interconnecting cables, WTT, surge arresters and resistive–capacitive filters. A parameterized black‐box WTT model is obtained from measurements and is used for investigating the transfer of resonant overvoltages from the MV to the LV side. The model is capable of shifting systematically the frequencies and adjusting the transformer input impedance. Simulation results show that wind turbine energization in an OWF can lead to overvoltages on the LV terminals. The rate of rise of overvoltages (du/dt) is in the range of 300–500 pu/µs. It is found that resistive–capacitive filters should be installed on both MV and LV terminals of WTTs to decrease both resonant overvoltages and du/dt, which is unachievable by surge arrester alone. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%