Grid Integration of offshore wind farms using a Hybrid HVDC composed by an MMC with an LCC-based transmission system
Grid Integration of offshore wind farms using a Hybrid HVDC composed by an MMC with an LCC-based transmission system
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DOI：
10.1016/j.egypro.2017.10.363
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发表时间：
2017-10
期刊：
影响因子：
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通讯作者：
R. Torres-Olguin;A. Garcés
中科院分区：
文献类型：
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作者：
R. Torres-Olguin;A. Garcés
本文提出了一种由全桥模块化多电平换流器（FB-MMC）和线性换流器（LCC）组成的混合高压直流输电系统，从海上风电场的并网。分析了三端混合直流输电系统的运行特性。两个LCC站和一个MMC站，使用PSCAD/EMTDC进行了研究。本文主要研究LCC逆变器在交流故障下系统的性能。这种情况对于整个系统来说是至关重要的，因为LCC容易发生换相故障，这可能会转化为混合动力系统上的直流故障。数值结果表明，FB-MMC可以帮助减轻交流故障条件下的LCC，系统能够重新启动后清除的故障。
This paper presents a hybrid HVDC-transmission system composed by a Full-Bridge Modular Multilevel Converter (FB-MMC) and a Line-commutated Converter (LCC) from the grid integration of offshore wind farms. The operational characteristics of a three-terminal hybrid-HVDC system, e.i. two LCC stations plus one MMC station, are investigated using PSCAD/EMTDC. This paper mainly focuses on the performance of the system under ac faults at the LCC inverter. This condition is critical for the entire system because LCC is prone to commutation failure, which can be translated into dc faults on the hybrid system. Numerical results show that FB-MMC can help to alleviate ac faults conditions in the LCC, and the system is able to restart after clearance of the fault.