王兴国,周泽昕,程琪
WANG Xingguo,ZHOU Zexin,CHEN Qi

• 1:中国电力科学研究院有限公司

摘要(Abstract)：

受新能源电源控制策略影响，新能源送出线路故障后故障相电流的幅值减小，线路两侧故障相电流之间的相位差增大，传统分相电流差动保护的灵敏性下降，严重情况下会导致区内故障时保护拒动。因此提出一种新能源送出线路的序电流差动保护新方法，利用故障后线路两侧序电流差异显著的特征，分别构造正、负、零序电流差动保护判据；选相元件利用故障支路电流不受新能源控制影响的特点，根据故障后正、负、零序差动电流相位和幅值特征构造高灵敏选相判据；二者相互配合，实现新能源送出线路故障的快速准确识别。该方法不受新能源电源控制响应影响，灵敏性优于传统分相电流差动保护。利用RTDS（实时数字仿真系统）建立仿真模型，仿真结果验证了所提保护方法的有效性。
The control strategies of renewable energy sources significantly impact fault characteristics in gridconnected transmission lines. During faults, the amplitude of fault phase current decreases while the phase difference between currents at both line ends increases, resulting in reduced sensitivity of conventional phase-segregated current differential protection. In severe cases, this may lead to protection failure during internal faults. To address these challenges, this paper proposes a novel sequence-current differential protection method specifically designed for renewable energy transmission lines. The method leverages the distinctive characteristics of sequence current discrepancies at both line ends during faults, establishing independent differential protection criteria for positive-, negative-, and zero-sequence components. The phase selection element utilizes the unique feature that fault branch currents remain unaffected by renewable energy controls, creating highly sensitive phase selection criteria based on the phase and amplitude characteristics of sequence differential currents. The coordinated operation of these components enables rapid and accurate fault identification in renewable energy transmission lines. Notably, the proposed method demonstrates immunity to control responses of renewable energy sources and exhibits superior sensitivity compared to traditional phase-segregated current differential protection. The effectiveness of the protection scheme is rigorously validated through real-time digital simulator(RTDS).

关键词(KeyWords)： 新能源送出线路;控制响应;序电流差动保护;选相元件
grid-connected renewable energy transmission lines;control response;sequence-current differential protection;phase selection element

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(U2166205)

作者(Author): 王兴国,周泽昕,程琪
WANG Xingguo,ZHOU Zexin,CHEN Qi

DOI: 10.19585/j.zjdl.202510003

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