南方电网技术2026，Vol.20Issue(7)：22-34,13.DOI:10.13648/j.cnki.issn1674-0629.2026.07.003
适应逆变电源并网的工频变化量距离保护动作优化策略
Optimization Strategy for Power Frequency Variation Distance Protection Adapted to Grid-Connected IIDG
摘要
Abstract
Inverter interfaced distributed generation(IIDG),influenced by grid connection requirements and control strategies,can be equivalently represented as a controlled current source externally,leading to unstable internal impedance after faults and resulting in poor adaptability of power-frequency variation distance protection in IIDG grid-connected environments.To address this issue,the reasons for the poor adaptability of power-frequency variation distance protection on the IIDG grid side are thoroughly analyzed.Based on the concept of coordinated control and protection,a positive-sequence fault component current suppression strategy is proposed.This strategy temporarily restores the fault component network under IIDG grid-connected conditions to a passive network similar to that under the influence of synchronous generators.PSCAD/EMTDC simulation results demonstrate that the proposed Strategy enables power-frequency variation distance protection to reliably distinguish between internal and external faults while improving its tolerance to fault resistance.This significantly enhances the operational reliability of power-frequency variation distance protection in IIDG grid-connected scenarios.Moreover,the control objective can be achieved within a very short time window.Once the protection meets the tripping conditions,the conventional IIDG fault ride-through control can be restored,ensuring no impact on its grid-connected capability during faults.关键词
控保协同/工频变化量距离保护/正序故障分量电流抑制/逆变电源/综合序分量Key words
collaboration between control and protection/power-frequency variation distance protection/positive sequence fault component current suppression/IIDG/comprehensive sequence component分类
信息技术与安全科学引用本文复制引用
翁汉琍,蒋秋雨,高靖怡,李振兴..适应逆变电源并网的工频变化量距离保护动作优化策略[J].南方电网技术,2026,20(7):22-34,13.基金项目
国家自然科学基金资助项目(52077120). Supported by the National Natural Science Foundation of China(52077120). （52077120）
