Superconducting wind turbine generators (SWTGs) are an effective option of 10 MW class WTG units integrated into offshore wind farms, owing to their potential advantage of reduced size and weight compared with conventional generators. Reliable grid-connection of SWTGs faces two main challenges including fault ride through (FRT) and wind power smoothing. Traditional solutions consist mainly of device-based and control-based schemes. However, the device-based scheme causes a high-cost burden due to the introduction of additional devices, while the control-based scheme is not suitable for FRT enhancement under serious grid faults. To solve these problems, this paper presents a cooperative strategy integrated with one cost-effective superconducting magnetic energy storage (SMES) device and two modified WTG controls. The utilization of SMES devices can achieve a favorable wind power smoothing effect during normal operations and overvoltage suppressing effect in dc-link of WTG during grid faults. Moreover, two modified WTG controls of power decreasing control method and reactive power control provide effective assistance for suppressing dc overvoltage, offering adequate reactive current support and reducing the capital cost of SMES devices simultaneously. Several test cases are conducted to demonstrate the feasibility of the proposed strategy.

中文翻译：

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SMES装置与改进控制的协同策略，实现10 MW级超导风力机经济高效的故障穿越增强和功率平滑

超导风力涡轮发电机 (SWTG) 是集成到海上风电场的 10 兆瓦级风力发电机组的有效选择，因为与传统发电机相比，它们具有减小尺寸和重量的潜在优势。SWTG 的可靠并网面临两个主要挑战，包括故障穿越 (FRT) 和风电平滑。传统的解决方案主要包括基于设备和基于控制的方案。然而，基于设备的方案由于引入了额外的设备而导致高成本负担，而基于控制的方案不适合严重电网故障下的FRT增强。为了解决这些问题，本文提出了一种集成了一个具有成本效益的超导磁能存储 (SMES) 设备和两个改进的 WTG 控制的合作策略。利用SMES装置可以在正常运行时实现良好的风电平滑效果，在电网故障时对风电机组直流环节起到过压抑制作用。此外，功率递减控制方法和无功功率控制这两种改进的风电机组控制为抑制直流过电压提供了有效的帮助，同时提供了足够的无功电流支持并降低了SMES设备的投资成本。进行了几个测试用例来证明所提出策略的可行性。提供足够的无功电流支持并同时降低 SMES 设备的资本成本。进行了几个测试用例来证明所提出策略的可行性。提供足够的无功电流支持并同时降低 SMES 设备的资本成本。进行了几个测试用例来证明所提出策略的可行性。