|
| 摘要: |
| 基于可关断电力电子器件和PWM技术,结合海上风电场长距离直流输电的特点,对海上风电柔性直流输电变流器进行了分析和研究.根据变流器主电路拓扑结构建立了系统在三相静止abc坐标系和两相旋转d-q坐标系下的数学模型;变流器控制系统采用双闭环控制,选取前馈解耦控制策略对电流内环的有功、无功电流进行解耦;同时引入电流状态反馈和网侧电压前馈补偿,提高了系统的动态性能和抗干扰能力;系统采用五段式空间矢量PWM调制方法,有效地降低了开关频率,减少开关损耗.仿真结果证明,该变流器适用于海上风电场柔性直流输电系统. |
| 关键词: 柔性直流输电 变流器 双闭环控制 电流状态反馈 电压前馈补偿 空间矢量 PWM |
| DOI： |
| 分类号:TM46 |
| 基金项目:上海市白玉兰科技人才基金，教育部留学回国科研基金，上海市教育发展基金，中国博士后科学基金? |
|
| Flexible direct current transmission converter for offshore wind farm |
|
LI Xiang WANG Zhixin LIU Wenjin
|
| Abstract: |
| The flexible converter for the long-distance DC transmission system of offshore wind farm is stu- died based on controllable power electronic components and PWM(Pulse Width Modulation)technology. Based on its main circuit topology,mathematical models are established in both three-phase static abc coor- dinate system and two-phase rotating d-q coordinate system.The feed-forward decoupling strategy is used in its dual close-loop control system to separate active and reactive currents.The current state feedbac... |
| Key words: flexible direct current transmission converter dual close-loop control current state feedback voltage feed-forward compensation SVPWM |
