摘要
由于分布式电源(DG)提供的故障电流水平很低,传统的过流保护方案不再适用于微网故障检测。基于测量阻抗变化的保护方案因其较高的灵敏性和适应性,可作为交流微网的保护方案。但是,现有的此类方案未考虑逆变类DG(IIDG)的故障穿越要求,且动作性能易受过渡电阻的影响。为此,提出了一种新的交流微网反时限距离(ITD)保护。新方案利用反时限动作特性方程设定保护动作时间,可同时满足IIDG故障穿越和馈线保护选择性的要求。针对过渡电阻和分支馈入的影响,提出了利用相邻保护装置交互信息以提高ITD保护性能的方法。利用Matlab/Simulink进行时域仿真,仿真结果验证了所提方案的有效性。
The conventional overcurrent protection is ineffective in isolating faults in microgrids due to the low fault current level contributed by distributed generations(DGs).Because of its high agility and adaptability,the measured impedance-based protection schemes are considered as common alternatives to detect faults.However,the fault ride-through(FRT)requirements are not considered in the exiting schemes,and action performance is susceptible to transition resistance.To solve the problem,a new inverse-time distance(ITD)protection scheme for AC microgrids was proposed.The proposed scheme used the inverse-time characteristics to set the operating time,which can meet the FRT requirements of inverter interfaced DGs(IIDGs)as well as the selectivity of feeder protection system.In response to the influence of transition resistance and branch feed-in,a method was developed to improve the performance of ITD protection,which was based on transmitting signals between adjacent relays.Time domain simulations were conducted in Matlab/Simulink and the effectiveness of the proposed protection scheme was verified by the results.
作者
王德明
李英量
贾俊辉
解晨
王语园
WANG Deming;LI Yingliang;JIA Junhui;XIE Chen;WANG Yuyuan(College of Rail Power,Shaanxi Railway Institute,Weinan 714000,Shaanxi,China;School of Electronic Engineering,Xi’an Shiyou University,Xi’an 710065,Shaanxi,China;Jinchuan Group Co.,Ltd.,Jinchang 737100,Gansu,China)
出处
《电气传动》
2022年第24期58-66,共9页
Electric Drive
基金
渭南市2019年重点研发科技计划项目(2019-ZDYF-JCYJ-127)
陕西铁路工程职业技术学院科研基金项目(KY2021-56)
陕西铁路工程职业技术学院教育教学研究项目(2021JG-22)
陕西铁路工程职业技术学院电能质量科技创新团队项目(KJTD202104)。
关键词
微网
反时限距离保护
馈线保护
故障穿越
microgrid
inverse-time distance(ITD)protection
feeder protection scheme
fault ride-through(FRT)
