现代电力2025，Vol.42Issue(1)：64-75,12.DOI:10.19725/j.cnki.1007-2322.2022.0476
单机柔直接入的双馈风力发电系统低电压穿越控制方法
Low-voltage Ride-through Control Method of Doubly-fed Wind Power Generation System Independently Linked to Flexible DC Grid
摘要
Abstract
In the application background of single large-capa-city doubly-fed wind generators(DFIG)connected to the medi-um voltage DC grid through a voltage source converter in all-DC wind farm,a DC low voltage ride-through control method was proposed based on voltage-frequency coordinated control at both ends of the machine and grid,to ensure the continuous controllable grid-connected operation of the DFIG after the voltage drop of the DC grid.Firstly,through theoretical analys-is,it was explained that the rigid and non adjustable frequency after voltage drop during AC grid connection is the main reas-on for the transient DC component of the stator flux and the overcurrent generated by the stator and rotor windings,Further-more,fully utilizing the flexible and adjustable characteristics of AC voltage and frequency within the DFIG system inde-pendently linked to flexible DC grid,the generation of transi-ent DC components of stator flux was avoided through coordin-ated control of stator voltage and frequency between the ma-chine and the grid,thereby eliminating the difficult to solve transient overcurrent phenomenon of stator and rotor during AC grid connection,and ensuring the continuous and controllable operation of the DFIG system.Simultaneously,the problem of DC overvoltage of rotor side converter was solved by adding DC unloading circuit.Finally,the effectiveness of the DC low voltage ride-through method based on voltage-frequency co-ordinated control was verified by the comparison of simulation of an AC grid-connected and flexible DC grid-connected single 5MW DFIG system.关键词
风电直流汇集/单机柔性直流接入/双馈风力发电系统/直流低电压穿越/压频协调控制Key words
DC collection of wind power/independently linked to flexible DC grid/doubly-fed wind power generation system/low voltage ride-through of DC grid/voltage-fre-quency coordinated control分类
动力与电气工程引用本文复制引用
崔学深,刘勇鑫,刘其辉,申旭辉,汤海雁..单机柔直接入的双馈风力发电系统低电压穿越控制方法[J].现代电力,2025,42(1):64-75,12.基金项目
华能集团总部科技项目(海上风电与智慧能源系统科技专项(一期)(HNKJ20-H88). Project Supported by Huaneng Group Headquarters Technology Project(Offshore Wind Power and Smart Energy System Technology Special Project(Phase I)(HNKJ20-H88)). （海上风电与智慧能源系统科技专项(一期）
