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首页> 外文期刊>Superconductor Science & Technology >A feasibility study of full-bridge type superconducting fault current controller on electric machine power stability
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A feasibility study of full-bridge type superconducting fault current controller on electric machine power stability

机译：全桥式超导故障电流控制器对电机功率稳定性的可行性研究

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Recently, because of the advent of Smart Grid and integration of distributed generations, electrical power grids are facing uncountable challenges. Increase of fault current is one of such serious challenges and there are some. fault current limiters (FCLs). that can limit the fault current. Existing grid protection FCLs, however, simply limit. the fault current passively and can allow the existing protection coordination schemes to. fail. This phenomenon leads to catastrophic failure in the complex system and may cause unpredictable power grid operation. Unlike a FCL, a superconducting fault current controller (SFCC) employs a full-bridge thyristor rectifier, a high temperature superconducting (HTS) DC reactor, and an embedded control unit to maintain the fault current level at a proper value by adjusting the phase angle of thyristors. This paper contains experimental and numerical analysis to design and fabricate a SFCC system for protection and stability improvement in power grids. At first, fundamental characteristics of a SFCC system were introduced. System circuit diagram and operational principles were proposed. Secondly, the developed small-scale SFCC system was introduced and verified. A 40 Vrms/30 Arms class prototype SFCC employing HTS DC reactor was fabricated and short circuit tests that simulate various fault conditions were implemented to verify the control performance of the fault current. Finally, the practical feasibility of application of the SFCC system to the power system was studied. The problems caused by three-phase faults from the power grid were surveyed and transient stability analysis of the power system was conducted by simulations. From the experimental and simulation results, we can verify the feasibility of the SFCC in power system.
机译：最近，由于智能电网的出现和分布式发电的集成，电网面临着无数的挑战。故障电流的增加是这样严重的挑战之一，并且存在一些挑战。故障电流限制器（FCL）。可以限制故障电流。但是，现有的电网保护FCL仅受限制。故障电流是被动的，并且可以允许现有的保护协调方案。失败。这种现象会导致复杂系统发生灾难性故障，并可能导致不可预测的电网运行。与FCL不同，超导故障电流控制器（SFCC）采用全桥可控硅整流器，高温超导（HTS）直流电抗器和嵌入式控制单元，可通过调节相角将故障电流保持在适当的值晶闸管。本文包含实验和数值分析，以设计和制造用于保护和提高电网稳定性的SFCC系统。首先，介绍了SFCC系统的基本特征。提出了系统电路图和工作原理。其次，介绍并验证了已开发的小型SFCC系统。制造了采用HTS直流电抗器的40 Vrms / 30 Arms级原型SFCC，并进行了模拟各种故障条件的短路测试，以验证故障电流的控制性能。最后，研究了SFCC系统在电力系统中的实际应用可行性。对电网三相故障引起的问题进行了调查，并通过仿真对电力系统进行了暂态稳定性分析。从实验和仿真结果，我们可以验证SFCC在电力系统中的可行性。

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