适用于IIDG接入的配网电流保护改进方案研究

刘钧溢; 柳梅元; 宁志恒; 戴志辉

doi:10.19912/j.0254-0096.tynxb.2024-1860

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太阳能学报 ›› 2025, Vol. 46 ›› Issue (6) : 367-375. DOI: 10.19912/j.0254-0096.tynxb.2024-1860

适用于IIDG接入的配网电流保护改进方案研究

戴志辉, 刘钧溢, 柳梅元, 宁志恒

作者信息 +

RESEARCH ON IMPROVED SCHEME OF DISTRIBUTION NETWORK CURRENT PROTECTION APPLICABLE TO INVERTER-INTERFACED DISTRIBUTED GENERATOR ACCESS

Dai Zhihui, Liu Junyi, Liu Meiyuan, Ning Zhiheng

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文章历史 +

摘要

分布式电源的接入改变了配电网结构、运行特性和故障特征,传统的配网电流保护方案由于未计及分布式电源的助增效应和新能源的出力波动特性,导致保护的灵敏度下降并且可能使保护失去选择性。为解决此类问题,提出计及逆变型分布式电源（IIDG）出力波动的配网电流保护改进方案。该方案结合短路电流的迭代计算结果,在线调整上级线路Ⅱ、Ⅲ段以及下级线路I段定值,并提出修正后定值适用的IIDG出力波动范围求解方法,保证下游线路在IIDG出力波动时正确动作。最后在PSCAD/EMTDC平台搭建仿真模型并结合Matlab编程,验证该方案能有效提高上游保护Ⅱ、Ⅲ段灵敏度以及保证下游保护I段选择性,提升传统三段式电流保护的性能。

Abstract

The distribution network structure, operation characteristics and fault characteristics have been changed by the access of distributed generation. Because the traditional current protection scheme of distribution network does not take into account the synergistic response and output fluctuation characteristics of distributed generator, this leads to a decrease in the sensitivity of the protection and may cause the protection to lose selectivity. To address this problem, an improved current protection scheme for distribution networks with inverter-interfaced distributed generators （IIDGs） is proposed, based on the IIDG output fluctuation. The scheme can iteratively calculate the short circuit current under normal operation, adjust the setting values of phases Ⅱ and Ⅲ of upstream line current protection and phase I of the downstream line current protection in real time, and solve the IIDG output range applicable to the setting, to ensure that the downstream line operates correctly when the new energy output fluctuates. Finally, it has been confirmed that the proposed scheme significantly enhances the sensitivity of phases Ⅱ and Ⅲ of upstream protection of the IIDG access points by Matlab programming and PSCAD/EMTDC simulations. Additionally, it ensures the selectivity of phase I of downstream protection, thereby improving the effectiveness of stepped current protection.

导出引用

戴志辉, 刘钧溢, 柳梅元, 宁志恒. 适用于IIDG接入的配网电流保护改进方案研究[J]. 太阳能学报. 2025, 46(6): 367-375 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1860

Dai Zhihui, Liu Junyi, Liu Meiyuan, Ning Zhiheng. RESEARCH ON IMPROVED SCHEME OF DISTRIBUTION NETWORK CURRENT PROTECTION APPLICABLE TO INVERTER-INTERFACED DISTRIBUTED GENERATOR ACCESS[J]. Acta Energiae Solaris Sinica. 2025, 46(6): 367-375 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1860

中图分类号： TM72

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