多功能直流集电器概念及其全直流海上风电系统  

Multi-function DC-collector Concept and Its All-DC Offshore Wind Power System

作　　者：赵彪[1] 安峰 屈鲁 余占清[1] 宋强[1] 曾嵘[1] ZHAO Biao;AN Feng;QU Lu;YU Zhanqing;SONG Qiang;ZENG Rong(State Key Laboratory of Control and Simulation of Power System and Generation Equipment(Department of Electrical Engineering,Tsinghua University),Haidian District,Beijing 100084,China)

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京市海淀区100084

出　　处：《中国电机工程学报》2021年第18期6169-6180,共12页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51877116);清华大学自主科研计划项目(2019Z08QCX17)。

摘　　要：直流汇集与输送是未来大规模海上风电系统的主要发展方向之一。为了实现低成本、高效率和高可靠性的海上风电全直流组网与输送,该文提出一种多功能直流集电器概念及其海上风电直流组网方案。通过引入直流集电器对风机单元进行能量汇集和级联升压,所构成的全直流组网系统不仅减小了机侧换流器规模和海上换流站平台,同时消除了风机的功率波动对于风场内网电压的影响,使得各个风机均可实现最大功率追踪并维持原有的控制和保护架构。此外,直流集电器概念的提出使得海上风电系统的运行更加灵活,同时兼顾故障隔离、动态切入切出、直流耗能运行等多种模式,为远距离大容量的海上风电建设提供了一种切实可行的解决方案。最后,通过搭建基于直流集电器的全直流海上风电系统的仿真模型,验证了所提方案的正确性与有效性。DC collection and transmission is one of the main developing directions of large-scale offshore wind power system.In order to achieve low-cost,high efficiency and high reliability all-DC offshore wind power collection and transmission,this paper proposed an all-DC offshore wind power networking scheme based on multi-functional DC collector.By introducing the DC collector concept to realize energy collection and cascade boost,the proposed networking system not only greatly reduced the wind turbine converters scale and offshore converter platform,but also eliminated the influence of power fluctuation captured by wind turbine on the series voltage of internal grid in the wind farm,so that each wind turbine achieved the maximum power point tracking operation and maintained the original control and protection architecture.In addition,the introduction of DC collector made the operation of offshore wind power system more flexible,and various operating modes were considered such as fault isolation,dynamic cut-in/out,and DC energy consumption operation etc.,which provided a practical solution for the construction of long-distance and large-capacity offshore wind farms.Finally,the effectiveness of proposed scheme was verified by simulation model of 400MW all-DC offshore wind power system.

关 键 词：海上风电 多功能直流集电器 直流汇集与输送 级联升压 在线投切 直流耗能 

分 类 号：TM46[电气工程—电器]