考虑平台运动的浮式海上风机频率响应控制

Under the influence of both hydrodynamic disturbances and aerodynamic negative damping, the frequency support capability of floating offshore wind turbines varies with the motion of the floating platform. Additionally, the floating platform may experience significant pitch motion during the system frequency response, which can severely impact the safe operation of floating wind turbines. In response to these two issues, a frequency response control strategy that takes platform motions into account is proposed. This strategy is rooted in an adaptive droop control, where the droop parameter adapts to the motion of the floating platform, thus compensating for the impact of platform pitch and surge motion on the aerodynamic performance of the rotor. Specifically, considering the above rated wind conditions, an individual pitch control strategy is designed for frequency response. This approach effectively mitigates the significant pitch motion of the floating platform during the frequency response process at a reduced control cost. Simulation results conducted on NREL 5 MW and IEA 15 MW semi-submersible floating wind turbines indicate that, the proposed strategy not only maximizes the utilization of the frequency support capability of floating wind turbines, but also reduces the pitch motion of the floating platform by over 20% during the frequency response process.