海上风场与海岛微网交互调频机制及控制策略研究

Research on frequency regulation mechanism and control strategy of interaction between offshore wind farm and island microgrids

为缓解大规模海上风电接入末端薄弱电网对系统频率造成的冲击,文章提出了海上风场与海岛微网交互调频机制及控制策略。首先,构建海上风场与海岛微网互联下的电力系统负荷频率控制模型,基于虚拟惯量控制方法,利用海岛微网可调分布式电源支撑海上风场参与调频;其次,为避免风机在提供虚拟惯量过程中发生转速恢复状态跳变,造成系统频率二次扰动,进一步设计了自适应动态量化因子,根据风机不同运行工况实时调控海岛微网支撑能力;最后,基于仿真模型验证了该交互机制及控制策略的有效性。

In order to alleviate the impact of large-scale offshore wind power on the system frequency caused by the connection to the terminal weak grid,this paper innovatively proposes the interactive frequency regulation mechanism and control strategy between offshore wind farm and island microgrids.Firstly,the load frequency control model of Zhuhai power grid including the interconnection of offshore wind farm and island microgrids is built.Based on the virtual inertia control method,the adjustable distributed power sources of island microgrids are designed to support the offshore wind farm to participate in frequency regulation.Secondly,in order to avoid the rotation speed recovery state during providing virtual inertia of the wind generator,which will result in secondary disturbance of system frequency,this paper further designs an adaptive dynamic quantization factor to adjust and control the supporting capacity of the island microgrids in real time according to different operating conditions of the wind generator.Finally,the effectiveness of the interaction mechanism and control strategy is verified based on the simulation model.