基于模糊PI控制的海上风电柔性直流输电整流器研究

Research on Rectifier of Offshore Wind Energy Flexible Direct Current Transmission Based on Fuzzy PI Control

为提高海上风电柔性直流输电电压等级,抑制直流侧电压跌落和闪变,将三相电压源变流器用于送端整流器。采用多个功率单元级联的拓扑结构,电流内环采用PI解耦控制、电压外环模糊PI调节双闭环控制方式。分析了变流器数学模型,建立了MATLAB/Simulink仿真模型,实现了电压级联输出,在线PI参数整定。仿真结果验证了该系统在海上风电柔性直流输电应用中的有效性。

A novel cascaded voltage source converters （VSC） topological structure utilized as an interface between the offshore wind energy inverter and the grid has been proposed in this paper, which raises the DC voltage level of offshore wind energy, inhibits the voltage drop and flicker on I）C side by inner current loop with PI control and voltage loop fuzzy with PI control scheme. Mathematical model has been analyzed, and MATLAB/Simulink model is built to implement the cascaded voltage output and PI parameters setting on line, simulation results show the validity of the system in offshore wind energy flexible direct current transmission.