Coordinated control of an HVDC link and doubly fed induction generators in a large offshore wind farm
Coordinated control of an HVDC link and doubly fed induction generators in a large offshore wind farm
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DOI：
10.1109/tpwrd.2005.858785
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发表时间：
2006
影响因子：
4.4
通讯作者：
Dawei Xiang;Li Ran;J. Bumby;P. Tavner;S. Yang
中科院分区：
文献类型：
--
作者：
Dawei Xiang;Li Ran;J. Bumby;P. Tavner;S. Yang
双馈感应发电机（DFIG）是大型风力涡轮机的经济变速解决方案，而高压直流（HVdc）传输正在考虑用于一些海上风电场的电网连接。本文分析了需要协调控制的DFIG和高压直流链路，使两种拓扑结构可以一起工作，给系统设计师和运营商的选择，可能是有用的，在某些应用。期望以与当它们直接连接到交流电网时所使用的方式类似的方式来控制各个发电机以进行功率跟踪，尽管在这种情况下用于DFIG控制的电网电压参考不再可用作独立源。研究表明，机器控制应明确保持通量水平，然后允许HVDC链路调节本地系统频率和间接电压幅度。DFIG和高压直流链路之间的相互作用进行了研究和仿真，以验证所提出的控制策略。
Doubly fed induction generators (DFIGs) are an economic variable-speed solution for large wind turbines while high-voltage dc (HVdc) transmission is being considered for the grid connection of some offshore wind farms. This paper analyzes the need for coordinating the control of the DFIGs and the HVdc link so that the two topologies can work together, giving system designers and operators a choice that may be useful in some applications. It is desired that individual generators be controlled for power tracking in a way similar to that used when they are connected directly to an ac grid, although a grid voltage reference for the DFIG control is no longer available as an independent source in this case. The study shows that machine control should explicitly maintain the flux level, which then allows the HVdc link to regulate the local system frequency and, indirectly, voltage amplitude. Interactions between DFIGs and the HVdc link are investigated and simulations performed to verify the proposed control strategy.