AC Hubs for Offshore Wind Power Plants Connected with HVDC Transmission Systems
AC Hubs for Offshore Wind Power Plants Connected with HVDC Transmission Systems
复制标题
与高压直流输电系统连接的海上风力发电厂的交流集线器
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
J. Weizenbeck
中科院分区：
文献类型：
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作者：
J. Weizenbeck
这项工作提出了一种新的控制方法，交流枢纽，海上风电场和不同的大陆电网通过高压直流输电线路互连。不同的协会提出了几项关于欧洲覆盖网格的建议。这就是AC Hub发挥作用的地方。为了在北海实现这样的电网，风电场和长距离HVDC输电线路需要互连。考虑互连的两个选项是多端HVDC配置或AC集线器。这项工作涉及到一种新的方法控制交流枢纽。
建立了基于常用控制策略的技术模型，并在MATLAB/Simulink中进行了仿真验证。主要目标是在缺乏快速可靠通信的情况下，确保AC Hub的完美运行。这是通过应用下垂控制方案来实现的，该下垂控制方案类似于通常应用于常规电网中的微电网或同步发电机的控制策略。
在介绍了控制策略后，选择了一种系统布局，该系统布局松散地基于海上风电场的现有数据和讨论北海HVDC电网未来场景的文献。并联电源转换器的功率共享，不同节点之间的功率传输以及故障期间的操作问题在这项工作中得到解决。
结果表明，通过应用所提出的下垂控制方案，交流枢纽的操作是可能的，没有快速和可靠的通信系统。
This work presents a novel control approach for AC Hubs, interconnecting offshore wind farms and different mainland grids via HVDC links. There are several proposals for a European overlay grid by different associations. This is where AC Hubs come into play. In order to implement such a grid in the North Sea, wind farms and long distance HVDC transmission lines need to be interconnected. The two options considered for interconnection are multiterminal HVDC configurations or AC Hubs. This work concerns itself with a novel approach for the control of AC Hubs.
A technical model based on common control strategies is established and verified by simulation in MATLAB/Simulink. The main objective is to guarantee flawless operation of the AC Hub in absence of fast and reliable communication. This is achieved by applying a droop control scheme, which is similar to control strategies that are typically applied to microgrids or synchronous generators in the conventional electrical grid.
After introducing the control strategy, a system layout is chosen, which is loosely based on existing data of offshore wind farms and literature discussing the future scenario of an HVDC grid in the North Sea. Issues with power sharing of parallel power converters, power transmission between different nodes as well as operation during faults are addressed within this work.
The results show that by applying the proposed droop-control scheme, the operation of the AC Hub is possible without fast and reliable communication systems.