远海风电柔直送出系统无通信主动频率支撑控制策略OA

To address the problem of insufficient frequency perception accuracy caused by active power coupling inter-ference on frequency information mapped by DC voltage in communication-free active frequency regulation of offshore wind power systems transmitted via flexible DC transmission,this paper proposes a communication-free active frequency support control strategy.Firstly,a dynamic analytical model is constructed to quantitatively reveal the inherent coupling mechanism between active power input fluctuations and DC voltage deviations,and a voltage-power coupling analysis framework is established.Secondly,a communication-free active frequency support strategy based on real-time power-voltage observation and feedforward compensation is proposed.Finally,a simulation model of the communication-free active frequency regulation system for offshore wind power via flexible DC transmission is built in Matlab/Simulink for simulation verification.The simulation results show that the proposed strategy can effectively suppress the interference of power transmission variations on frequency signals and markedly improve the accuracy of offshore-side perception for onshore grid frequency.The proposed strategy enhances the system's active frequency support capability while ensuring stable dynamic response,which provides a feasible solution for communication-free frequency regulation of offshore wind power.