Overvoltage transient is the major danger facing large offshore wind farms, as it may lead to
a complete failure of the system components. A 150 MW offshore wind farm was modeled using the ATPEMTP package to analyze the effect of the temporary overvoltage resulting from de-energization conditions,
and the ferro resonance phenomenon resulting from the asymmetric opening of circuit breaker pole(s). The
results showed that the best scenario to shut down such a system from the grid with minimum values of
temporary overvoltage is to disconnect it, feeder, by a feeder. The stuck of one or more poles during the
opening operation of the circuit breaker is a dangerous phenomenon, as it induces a high overvoltage value,
which lasts for a long time causing more electric stress on the sensitive components of the system. The use
of the Pre-Insertion Resistor PIR was recommended as a mitigation technique for the temporary overvoltage
in large offshore wind farms, as it proves a significant reduction in the overvoltage values reaches to 79.44 %
compared to surge arrester and shunt reactor which reduce the over voltage by 68.33%, 66.29% respectively.
The genetic algorithm was used to find the optimum value of the PIR and shunt reactor that leads to the
minimum TOV. The optimum value of PIR which was recorded is equal to 57.352 Ohm, which leads to
more reduction in the overvoltage value by 9.67%. Also, the optimum values of the resistor and inductor
of the shunt reactor were found to be 11.238 Ohms and 37.246 mH which leads to more reduction in the
overvoltage value by 21.97% compared to the reduction without optimization