高电压技术2025，Vol.51Issue(2)：581-592,中插7-中插11,17.DOI:10.13336/j.1003-6520.hve.20240921
新能源柔直送出系统变压器保护性能分析及改进方法
Performance Analysis and Improvement Methods for Transformer Protection in New Energy Flexible HVDC Transmission Systems
摘要
Abstract
In the context of large-scale new energy flexible HVDC transmission systems,the high harmonic characteris-tics of differential currents during transformer faults at the sending end,as well as the inrush current characteristics during single-phase ground faults on the valve side of the receiving end transformer,present new challenges for transformer pro-tection.To address the failure of traditional protection methods under certain fault conditions in this scenario,a transformer time-domain equivalent inductance protection method based on cumulative fitting error weighting is proposed.This method,incorporating parameter identification,calculates the equivalent inductance to directly reflect the transform-er's state and uses the cumulative weighting of fitting errors to compensate for the high volatility typically seen in traditional time-domain calculations.The results demonstrate that this method effectively avoids the problem of incorrect blocking in second harmonic restraint criteria and exhibits superior performance in simulation tests,unaffected by power source characteristics and control strategies.This method has significant potentials for engineering applications.关键词
新能源柔直送出系统/故障电流谐波/故障性涌流/变压器保护/等效电感/误差权重拟合Key words
flexible HVDC transmission system for new energy/fault current harmonics/fault-induced inrush current/transformer protection/equivalent inductance/weight fitting引用本文复制引用
闫旭,何佳伟,温涛,李斌,李岩,周博昊..新能源柔直送出系统变压器保护性能分析及改进方法[J].高电压技术,2025,51(2):581-592,中插7-中插11,17.基金项目
国家自然科学基金联合基金(U23B20112) （U23B20112）
南方电网公司科技项目(036000KK52222025).Project supported by Joint Funds of National Natural Science Foundation of China(U23B20112),Science and Technology Project of China Southern Power Grid Corporation(036000KK52222025). （036000KK52222025）
