飞轮储能参与风场调频控制研究

Research on participation of flywheel energy storage in wind farm frequency regulation control

针对大规模风电并网导致系统惯性减小、频率波动加剧和电能质量变差等一系列问题,设计了具有高功率密度的飞轮作为风电场储能设备,并将其连接于箱变低压侧,实现电网峰谷调节,增强系统惯性,达到调频的目的。飞轮储能机侧变流器采用电流矢量控制,使系统输出功率具备灵活调节能力,网侧变流器采用电压定向矢量控制策略,保证直流母线电压稳定。为验证系统运行的可靠性,采用MATLAB/Simulink搭建仿真模型进行了测试,结果表明:所设计的储能系统具有控制简单高效、便于安装施工等特点;基于飞轮储能的运行机理设置了转速控制模块,使储能系统能够在安全域内高效运行;从机侧和网侧两方面设计了电流、电压矢量控制方案,使其功率输出平滑且电压趋于稳定。

In view of a whole series of problems such as the reduction of system inertia,the increase of frequency fluctuation,and the deterioration of power quality caused by large-scale wind power integration,a flywheel with high power density is designed for energy storage in wind farm and connected to the low voltage side of the box type transformer for the purpose of peak and valley regulation,system inertia enhancement and frequency regulation.The converter on the side of the flywheel energy storage system adopts current vector control,so that the output power of the system can be flexibly adjusted.The grid-side converter adopts a voltage directional vector control strategy to ensure the stability of the DC bus voltage.In order to verify the operation reliability of the system,Mat lab/Simulink is used to build a simulation model for testing.The results show that the energy storage system is simple to operate,efficient and convenient for installation and construction;a rotation speed modular is designed based on the operation mechanism of flywheel energy storage so that the system can operate within safety domain efficiently;control schemes of current and voltage vector on the system side and grid side are formulated respectively so that the output power can be smooth and the voltage stable.