The current-limiting performance of the dc resistive-type superconducting fault current limiter (dc R-SFCL) is vital to the reliability in the high voltage dc current (HVDC) transmission system. It is expensive and difficult to utilize the discharging process of the precharged dc capacitor to evaluate the current-limiting performance. In this paper, a R-Q curve based evaluation method for current-limiting performance of dc R-SFCLs in dc system is proposed, which replaces the dc impulse experiment with ac impulse experiment. A ±160kV dc SFCL prototype is designed by Guangdong Power Grid Co., Ltd., and tested to acquire the experimental heat accumulation Q and the experimental R-Q curve. Accordingly, the mathematical model consistent with the prototype is built in PSCAD. Finally, a fault condition is simulated in dc system to verify the feasibility of the R-Q curve based evaluation method. It is shown that the proposed method has superior properties in simplifying the testing platform, reducing the test requirements and costs, and providing reference for precise modeling of SFCLs.

中文翻译：

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基于RQ曲线的高压直流系统直流R-SFCL限流性能评价方法

直流电阻型超导故障限流器 (dc R-SFCL) 的限流性能对于高压直流 (HVDC) 输电系统的可靠性至关重要。利用预充电直流电容器的放电过程来评估限流性能既昂贵又困难。本文提出了一种基于RQ曲线的直流系统直流R-SFCLs限流性能评价方法，用交流脉冲实验代替直流脉冲实验。广东电网有限公司设计了一个±160kV dc SFCL样机，并通过测试获得了实验累积热量Q和实验RQ曲线。相应地，与原型一致的数学模型建立在 PSCAD 中。最后，在直流系统中模拟故障条件，以验证基于 RQ 曲线的评估方法的可行性。结果表明，所提出的方法在简化测试平台、降低测试要求和成本方面具有优越的性能，为SFCLs的精确建模提供了参考。