有源配电网被动式防孤岛保护配置研究  

Research on the configuration of passive anti-islanding protection in active distribution network

作　　者：姜淼 严伟[1] 徐光福[1] 华秀娟[1] 黄涛[1] JIANG Miao;YAN Wei;XU Guangfu;HUA Xiujuan;HUANG Tao(NR Electric Co.,Ltd,Nanjing 211102)

机构地区：[1]南京南瑞继保电气有限公司,南京211102

出　　处：《电气技术》2023年第9期34-39,48,共7页Electrical Engineering

基　　金：国网经研院科技项目(5400-202256273A-2-0-XG)。

摘　　要：大量分布式电源接入配电网需要配置防孤岛保护,防孤岛保护的死区、与其他二次功能的配合整定等问题亟待分析与研究。本文根据孤岛后的频率和电压偏移评估公式得出,防孤岛保护的频率死区与无功缺额、负荷品质因数强相关,电压死区与有功缺额强相关,需要在缺额最小和负荷品质因数最大的情况下评估死区。故障引发的孤岛运行,在相间短路、断线等严重故障情况下可能导致防孤岛保护误动作,防孤岛保护时间需要躲过故障持续时间。此外,防孤岛保护时间应小于上级变压器间隙保护、逆功率保护、非不检方式重合闸和备自投、就地型馈线自动化的定值时间,大于故障穿越定值时间。根据本文得出的配置方案,在防孤岛保护时间按照2.0s配置的情况下进行定值整定分析,结果表明若光伏渗透率高会导致上级变压器间隙保护误动作,建议此种情况下上级线路末端增加保护和断路器。With a large number of distributed generations injecting into the distribution network,anti-islanding protection should be installed,whose dead zone and coordination with other secondary functions needs to be further analyzed and studied.According to the evaluation formula of frequency and voltage deviation after islanding,the frequency dead zone of anti-islanding protection is strongly related to reactive power shortage and load quality factor,and the voltage dead zone is strongly related to active power shortage.It is necessary to evaluate the dead zone under the condition of minimum shortage and maximum load quality factor.The islanding operation caused by fault may lead to malfunction of anti-islanding protection in case of serious faults such as interphase short circuit and breakage.The anti-islanding protection time needs to avoid the fault duration.In addition,the anti-islanding protection time shall be less than the setting time of the upper transformer gap protection,reverse power protection,non-inspection mode reclose and standby automatic switching,local feeder automation,and greater than the fault crossing setting time.According to the configuration scheme given by this article,the setting analysis of the anti-islanding protection time is carried out according to the 2.0s configuration.If there exists photovoltaic with high permeability,it will lead to the malfunction of the upper transformer gap protection,and it is recommended to add protection and circuit breaker at the end of the upper line in this case.

关 键 词：有源配电网 分布式电源 光伏 防孤岛保护 故障穿越 

分 类 号：TM77[电气工程—电力系统及自动化]