基于特征谐波距离系数的有源配电网纵联保护

戴志辉; 柳梅元; 韦舒清; 王文卓

doi:10.19912/j.0254-0096.tynxb.2024-0688

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太阳能学报 ›› 2025, Vol. 46 ›› Issue (8) : 686-696. DOI: 10.19912/j.0254-0096.tynxb.2024-0688

基于特征谐波距离系数的有源配电网纵联保护

戴志辉, 柳梅元, 韦舒清, 王文卓

作者信息 +

PILOT PROTECTION SCHEME FOR ACTIVE DISTRIBUTION NETWORK BASED ON CHARACTERISTIC HARMONIC DISTANCE COEFFICIENT

Dai Zhihui, Liu Meiyuan, Wei Shuqing, Wang Wenzhuo

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文章历史 +

摘要

为解决逆变型分布式电源（IIDG）大规模以T接方式接入配电网后传统纵联差动保护难以保证可靠动作的问题,提出一种基于特征谐波主动注入的有源配电网纵联保护方案。首先,提出基于谐波电压控制环节的特征谐波电流注入方法,并对其控制参数的选取进行阐述。然后,分析含T接IIDG和T接负荷的配电网在故障后所呈现的高频特征谐波电压、电流的故障特征。在此基础上,推导得出区内外故障时线路两侧的特征谐波推算电压和实际测量值的关系。最后,利用特征谐波电压和测量值之间的波形距离系数构造故障识别判据。仿真结果表明,所提方案在不同故障情况下均能可靠动作,无需实时获取T接IIDG的运行信息,通信压力较小,且适用于T接IIDG数量较多的场景。

Abstract

In order to solve the problem that the traditional longitudinal differential protection is difficult to ensure reliable operation after IIDG being massively connected to the distribution network by T connection mode, a longitudinal protection scheme of active distribution network based on active injection of characteristic harmonics is proposed. Firstly, a characteristic harmonic current injection method based on harmonic voltage control link is proposed, and the selection of its control parameters is described. Then, the fault characteristics of high-frequency characteristic harmonic voltage and current of distribution networks are analysed. On this basis, the relationship between the calculated voltage of the characteristic harmonic and the actual measured value is derived. Finally, the fault identification criterion is constructed by using the waveform distance coefficient between the characteristic harmonic voltage and the measured value. The simulation results show that the proposed scheme can operate reliably under different fault conditions, without need to obtain the operation information of T-connected IIDG in real time. The communication pressure is small, and it is still applicable in the case of a large number of T-connected IIDGs.

导出引用

戴志辉, 柳梅元, 韦舒清, 王文卓. 基于特征谐波距离系数的有源配电网纵联保护[J]. 太阳能学报. 2025, 46(8): 686-696 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0688

Dai Zhihui, Liu Meiyuan, Wei Shuqing, Wang Wenzhuo. PILOT PROTECTION SCHEME FOR ACTIVE DISTRIBUTION NETWORK BASED ON CHARACTERISTIC HARMONIC DISTANCE COEFFICIENT[J]. Acta Energiae Solaris Sinica. 2025, 46(8): 686-696 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0688

中图分类号： TM771

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