Hybrid Threshold Virtual Impedance for Fault Current Limiting in Grid-Forming Converters
Hybrid Threshold Virtual Impedance for Fault Current Limiting in Grid-Forming Converters
复制标题
用于限制并网转换器中的故障电流的混合阈值虚拟阻抗
DOI：
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Dominic Gross
中科院分区：
文献类型：
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作者：
Zexian Zeng;Prajwal Bhagwat;M. Saeedifard;Dominic Gross
本文提出了一种混合阈值虚拟阻抗方法，用于电网变换器在平衡相跃和短路故障下有效地限制电流。为此，提出了一种基于电压信息（VIv）的虚拟阻抗方法，以提高标准阈值虚拟阻抗方法对相跃（例如由于故障清除或开路故障）的限流能力。为了充分利用阈值虚拟阻抗和VIv方法的优点，提出了一种集成的混合阈值虚拟阻抗方法，该方法对相跃和短路故障都具有可靠的限流能力。电磁瞬变（EMT）仿真结果表明，与阈值虚拟阻抗或VIv方法相比，混合阈值虚拟阻抗方法提高了故障穿越（FRT）性能。
This paper presents a hybrid threshold virtual impedance method for grid-forming (GFM) converters to effectively limit current under balanced phase jumps and short-circuit faults. To this end, a virtual impedance method based on voltage information (VIv) is proposed to improve the current limiting capability of the standard threshold virtual impedance method for phase jumps (e.g., due to fault clearing or open circuit faults). To leverage the strengths of both threshold virtual impedance and VIv methods, an integrated hybrid threshold virtual impedance method is proposed, which enables reliable current limiting capabilities for both phase jumps and short-circuit faults. Electromagnetic transient (EMT) simulations demonstrate the improved fault ride-through (FRT) performance of the hybrid threshold virtual impedance method compared to threshold virtual impedance or VIv methods.