基于电压不平衡度正反馈的孤岛检测新方法  

Islanding detection based on positive feedback of voltage unbalance factor

作　　者：孙博[1] 郑建勇[1] 梅军[1] 

机构地区：[1]东南大学电气工程学院,江苏南京210096

出　　处：《电力自动化设备》2015年第2期121-125,共5页Electric Power Automation Equipment

基　　金：江苏省科技支撑计划项目(BE2012036);江苏省前瞻性联合研究项目(BY2014127-13)~~

摘　　要：为了实现孤岛无盲区与非破坏性检测,提出一种基于电压不平衡度正反馈的孤岛检测方法。当孤岛发生后,正反馈回路将导致公共连接点(PCC)的电压不平衡度呈放大趋势,通过检测PCC的电压不平衡度即可判断孤岛的发生。为了避免伪孤岛情况下的误操作,设定了伪孤岛的判定条件,引入判定时长,当电压不平衡度超过预设阈值ε*的时间超过该判定时长时,则可确定孤岛发生。仿真结果验证了所提方法能够在IEEE Std.1547标准所定义的最恶劣情况下快速、有效地检测出孤岛的发生,同时能够避免伪孤岛情况下的误操作。A method of islanding detection based on the positive feedback of voltage unbalance factor is proposed to realize the nondestructive detection without dead-zone. During islanding,the positive feedback circuit will enlarge the voltage unbalance factor of PCC（Point of Common Coupling）,which can be calculated to detect the islanding. The duration of the voltage unbalance factor greater than a preset threshold ε＊is introduced as a criterion and a true islanding is detected only when it is larger than the preset time,which is used to avoid the incorrect operation under the false islanding situation. The simulative results indicate that,the proposed method detects the islanding rapidly and accurately under the most severe conditions defined in IEEE Std.1547 and the incorrect operations under false islanding condition are avoided.

关 键 词：孤岛检测 正反馈 有功电流 电压不平衡度 伪孤岛 

分 类 号：TM71[电气工程—电力系统及自动化]