Investigation and Mitigation of Temporary Overvoltage Caused by De-Energization on an Offshore Wind Farm

Ajibola Akinrinde, Andrew Swanson and Innocent Davidson
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Ajibola Akinrinde: Department of Electrical, Power Engineering, Durban University of Technology, Durban 4001, South Africa
Andrew Swanson: Department of Electrical, Electronics and Computer Engineering, University of KwaZulu-Natal, Durban 4001, South Africa
Innocent Davidson: Department of Electrical, Power Engineering, Durban University of Technology, Durban 4001, South Africa

Energies, 2020, vol. 13, issue 17, 1-18

Abstract: 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.

Keywords: de-energization; Poincaré map; phase plane diagram; wind farm; ferroresonance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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