电力系统及其自动化学报2025，Vol.37Issue(5)：78-90,13.DOI:10.19635/j.cnki.csu-epsa.001509
适用于光伏场站送出线路的改进距离保护方案
Improved Distance Protection Scheme for Feeder Lines of PV Field Station
摘要
Abstract
To solve the problem that the adaptability of traditional distance protection will decline due to the large-scale photovoltaic(PV)grid-integration,the traditional distance protection scheme is improved in this paper by utilizing the Fast Sequential Action Principle.Aimed at the protection on the large grid side and based on the negative-and zero-se-quence networks under fault conditions,the sequence current conditions constructed by the negative-sequence current suppression strategy on the side of a PV field station and the corresponding feature(i.e.,the zero-sequence current branch coefficient is not affected by the control strategy for the PV inverter)are used to formulate a short-circuit imped-ance algorithm independent of the size of transition resistor to solve the fault distance.After the protection on the system side determines that a fault occurs in the zone and thus trips the circuit breaker,the PV-side protection can accurately calculate the short-circuit impedance without the influence of the feed flow by solving the short-circuit impedance trian-gle composed of impedance relays.Simulation results based on PSCAD/EMTDC show that the proposed scheme elimi-nates the impact of transition resistor and achieves a high ranging accuracy,which can protect the entire length of the line while providing a fault ranging capability.关键词
负序电流抑制/虚拟同步机/距离保护/过渡电阻/改进距离保护/故障测距Key words
negative-sequence current suppression/virtual synchronous generator/distance protection/transition re-sistor/improved distance protection/fault ranging分类
动力与电气工程引用本文复制引用
许浩千,张今,王英英,陈祥文,黎钊,林湘宁..适用于光伏场站送出线路的改进距离保护方案[J].电力系统及其自动化学报,2025,37(5):78-90,13.基金项目
国家电网公司科学技术项目(521400230004). （521400230004）
