中国电机工程学报2025，Vol.45Issue(18)：7123-7135,中插9,14.DOI:10.13334/j.0258-8013.pcsee.240513
基于暂态极性比较的分布式光伏配电网快速方向判据新方法
A New Fast Direction Criterion Based on Transient Polarity Comparison for Distribution Networks With Distributed Photovoltaic Access
摘要
Abstract
With the increase in the capacity and proportion of distributed photovoltaics connected to the distribution network,the ability of downstream photovoltaics to supply fault current in the event of reverse direction faults is also enhanced,leading to a decrease in the sensitivity of line current protection and even maloperation.The introduction of directional criteria can effectively solve the reverse maloperation problem of distribution line current protection after high penetration integration of distributed photovoltaic.To this end,this article first evaluates the applicability of traditional power direction protection.Analysis has found that the impedance of photovoltaic power sources at power frequency is capacitive,while the impedance of lines is inductive,resulting in incorrect operation of power direction protection criteria based on measured impedance angle characteristics as the photovoltaic capacity of the distribution network increases.Furthermore,this article reveals the differences in transient voltage and current polarity characteristics between forward and reverse faults,taking into account the influence of photovoltaics.On this basis,a new direction criterion based on transient voltage and current polarity comparison is proposed for high penetration access of distributed new energy.It can quickly and reliably identify the fault direction based solely on single terminal information.Finally,a large number of simulation examples have verified the feasibility and performance advantages of the proposed method.关键词
高比例分布式光伏接入/功率方向元件适用性/暂态电压电流极性/故障方向辨识Key words
high penetration access of distributed photovoltaics/applicability of power directional components/transient voltage and current polarity/fault direction identification分类
信息技术与安全科学引用本文复制引用
李晔,贾娜,何佳伟,李斌,牟锐,赵汉卿..基于暂态极性比较的分布式光伏配电网快速方向判据新方法[J].中国电机工程学报,2025,45(18):7123-7135,中插9,14.基金项目
国家自然科学基金(青年科学基金项目)(52207088) （青年科学基金项目）
河北省自然科学基金项目(E2024202184).Supported by National Natural Science Foundation of China(Youth Science Fund Project)(52207088) （E2024202184）
Natural Science Foundation of Hebei Province Funding Project(E2024202184). （E2024202184）
