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Title: Investigation and mitigation of temporary overvoltage caused by de-energization on an offshore wind farm
Authors: Akinrinde, Ajibola O. 
Swanson, Andrew 
Davidson, Innocent
Keywords: De-energization;Poincaré map;Phase plane diagram;Wind farm;Ferroresonance
Issue Date: Aug-2020
Publisher: MDPI AG
Source: Akinrinde, A., Swanson, A. and Davidson, I. 2020. Investigation and mitigation of temporary overvoltage caused by de-energization on an offshore wind farm. Energies, 13(17): 4439-4439. Available: doi:10.3390/en13174439
Journal: Energies; Vol. 13, Issue 17 
The Ferranti effect could cause a rise in voltage along the cables on a wind farm if the circuit breakers at the receiving ends are switched off. Ferroresonance could also occur due to stuck pole(s) of the circuit breaker during de-energization. This paper reports on the temporary overvoltage (TOV) arising from the de-energization of the circuit breaker connecting the wind turbine to the feeder, the feeder breaker connecting an array of wind turbines to the point of common coupling (PCC), and the opening of the circuit breaker connecting the onshore to the offshore substation. Ferroresonance was characterized using a phase plane diagram and Poincaré map and was identified to be chaotic. The effect of the nonlinear characteristic of the wind transformer core on the ferroresonant overvoltage was examined and increased with the steepness of slope of the transformer curve. A damping resistor, shunt reactor and surge arrester were used to mitigate the overvoltage experienced during the ferroresonant event. The damping resistor was able to reduce the overvoltage to 1.24 P.U. and damped the ferroresonance from chaotic to fundamental mode.
ISSN: 1996-1073 (Online)
DOI: 10.3390/en13174439
Appears in Collections:Research Publications (Engineering and Built Environment)

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