李娟,姜云龙,朱睿,杨雄
LI Juan,JIANG Yunlong,ZHU Rui,YANG Xiong

• 1:国网江苏省电力有限公司电力科学研究院

摘要(Abstract)：

由于IIDG（逆变型分布式电源）的出力具有一定的波动性，配电网的故障特性也发生了变化，这给继电保护定值整定带来了困难。以典型的含IIDG小电阻接地系统为例，首先，分析了IIDG接入后在单相接地故障时的零序电流特性，阐明了IIDG对传统零序电流速断保护的影响。然后，在此基础上给出了IIDG故障电流求解算法，并提出了一种零序电流自适应保护方案，以提高保护的选择性和可靠性，适应高渗透率新能源的接入。最后，对所提方法进行仿真验证，证明了该方法的有效性和实用性。
Due to the inherent output fluctuations of inverter-interfaced distributed generators(IIDGs), the fault characteristics of distribution networks have changed, posing challenges for relay protection setting. Taking a typical low-resistance grounding system with IIDG as an example, this paper first analyzes the zero-sequence current characteristics during single phase-to-ground faults after IIDG integration and clarifies its impact on traditional instantaneous zero-sequence current protection. Based on this analysis, a fault current calculation algorithm for IIDGs is proposed, along with an adaptive zero-sequence current protection scheme to enhance protection selectivity and reliability, thereby accommodating high-penetration renewable energy integration. Finally, simulation results validate the effectiveness and practicality of the proposed method.

关键词(KeyWords)： IIDG;故障电流;自适应零序电流保护;单相接地故障
IIDG;fault current;adaptive zero-sequence current protection;single phase-to-ground fault

Abstract:

Keywords:

基金项目(Foundation): 国家电网有限公司科技项目(J2023102)

作者(Author): 李娟,姜云龙,朱睿,杨雄
LI Juan,JIANG Yunlong,ZHU Rui,YANG Xiong

DOI: 10.19585/j.zjdl.202507011

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