中国电机工程学报2024，Vol.44Issue(22)：8834-8845,中插12,13.DOI:10.13334/j.0258-8013.pcsee.230881
基于信号同步注入的多源配网阻抗测量防孤岛保护方法
Anti-islanding Protection Method for Multi-source Distribution Network Impedance Measurement Based on Signal Synchronization Injection
摘要
Abstract
Grid-connected distributed generators(DG)need to be equipped with anti-islanding protection to avoid unplanned islanding due to power grid blackouts.The impedance measurement method has the advantages of low non-detection zone and less prone to maloperation compared with passive anti-islanding protection such as over/under voltage and over/under frequency.However,in multi-DG systems,the existing signal injection strategy and islanding identification criteria cannot cope with the protection failure caused by signal interference between DGs.To this end,an impedance measurement method is proposed,which utilizes external synchronous signals to synchronize the injection of detection signals by each DG.Based on the analysis of the impedance measurement characteristics of the DGs before and after islanding,an impedance angle-based islanding identification scheme is determined and the identification criteria are proposed based on the analysis of line parameters,harmonics,and detection signal frequencies.Finally,the signal injection and the corresponding islanding identification method are presented in conjunction with the DG control strategy.Simulation verification based on RTDS shows that the method can effectively identify the grid disturbance and islanding state,and avoid the refusal and false action problems of over/under voltage and over/under frequency anti-islanding protection.关键词
配电网/防孤岛保护/同步信号注入/阻抗角判据/卫星授时Key words
distribution network/anti-island protection/synchronous signal injection/impedance angle criterion/satellite timing分类
信息技术与安全科学引用本文复制引用
徐化博,陈羽,徐丙垠,王全,孙伶雁,孙中玉,王鹏玮..基于信号同步注入的多源配网阻抗测量防孤岛保护方法[J].中国电机工程学报,2024,44(22):8834-8845,中插12,13.基金项目
国家自然科学基金项目(52077221). Project Supported by National Natural Science Foundation of China(52077221). （52077221）
