To an insufficiently damped electrical resonance in the sub-synchronous frewas triggered power into jecting reactiveby the event.the grid thereby restoring the voltage back to nominal. Howquency variety, which was triggered by the event. ever, From16:52:33:490few 16:52:33:728, the sub-synchronous 1-Oleoyl-2-palmitoyl-sn-glycero-3-PC Biological Activity oscillation with the technique lasted inside the 16:52:33:490 to power method From following to hundred milliseconds, as the wind farm’s active from the decreased about 238 ms and passed 16:52:33:728, the sub-synchronous inside the of a single oscillation by way of about two VU0152099 Autophagy energy balance oscillation farm changed, cycles. The duration wind to cope with the voltage dip and also the reactive two cycles. The duration of a single oscillasted about 238 ms and passed by means of about cycle was about 119 ms the majority of the windand the oscillation frequency was about 8.four Hz. Hz. lation cycle was about 119turbines thethe wind farm have been disconnected by automatic proms and in oscillation frequency was about 8.4 tection systems. The de-load was caused by an unexpected wind farm handle method re2.three. Causes with the Accident sponse, because of an insufficiently damped electrical resonance inside the sub-synchronous freFor the sub-synchronous oscillation event caused by lightning strike, Hornsea wind quency range, which was triggered by the occasion. farm operator Orsted pointed out that the reason is insufficient damping in the subFrom 16:52:33:490 to 16:52:33:728, the sub-synchronous oscillation from the program synchronous oscillation frequency variety. Just after becoming struck by lightning, the equivalent lasted about 238 ms and passed by way of about two cycles. The duration of a single oscilgrid strength in the grid-connected point is weak, which causes the oscillation on the lation cycle was about 119 ms plus the oscillation frequency was about 8.4 Hz.16:52:34:Energies 2021, 14,five ofreactive energy handle method. As a result, the wind energy gathering station voltage drops sharply, resulting in all wind turbine generators on Hornsea 1B and Hornsea 1C minimizing to 0 MW as a result of overcurrent protection inside the generators [2,8]. The accident was fundamentally triggered by two reasons. Around the 1 hand, the Hornsea offshore wind farm is connected towards the UK major energy grid by means of a long distance submarine cable of 120 km. Using the boost of your length of high-voltage AC submarine cable, the equivalent grid strength from the grid-connected point from the offshore wind farm weakens, so the assistance impact on the AC grid on the voltage in the grid-connected point from the Hornsea wind farm decreases. On the other hand, Hornsea wind farm is often a long-distance offshore wind power program. So that you can compensate the capacitive present on the cable and limit the energy frequency overvoltage, Hornsea wind farm makes use of reactive compensation devices, including static var compensator (SVC), to enhance the transmission capacity of lines and enhance the transient stability from the program. Having said that, due to its unreasonable manage mode, the response of SVC has hysteresis, the peaks and valleys of the reactive energy output curve are nearly coincident using the over-surge and drop points of your bus voltage, as well as the regulation of reactive energy is within the similar path because the voltage adjust. Beneath the combined action of these two things, sub-synchronous oscillation occurred in Hornsea wind power method. three. Options When the Hornsea wind energy system suffered from asymmetric faults, which brought on sub-synchronous oscillation, there had been many as.
