带频率正反馈的无功电流扰动孤岛检测方法  

Reactive Current Disturbance Islanding Detection Method with Frequency Positive Feedback

作　　者：张凯航[1,2] 袁越[1,2] 傅质馨[1,2] 

机构地区：[1]河海大学能源与电气学院,南京211100 [2]河海大学可再生能源发电技术教育部工程研究中心,南京210098

出　　处：《电力系统及其自动化学报》2013年第1期96-101,共6页Proceedings of the CSU-EPSA

基　　金：国家电网公司科技项目"规模化光伏发电运行控制关键技术研究与示范"

摘　　要：理想的孤岛检测方法要求在快速检测出孤岛状态的同时尽量减少对电网的不良影响。在传统无功电流扰动孤岛检测方法的基础上,提出了一种基于频率正反馈的无功电流扰动孤岛检测法。该方法通过施加周期性无功扰动电流,并将电压频率前馈,当频率发生改变时进一步施加无功扰动电流,使频率越限,从而实现无盲区孤岛检测。该方法具有不影响电网频率,不向电网注入谐波,对逆变器输出功率因数的影响极小等优势。仿真结果证明了该方法的有效性。A desired islanding detection method is required to detect islanding situation within an acceptable duration and to reduce the impact on power quality. In this paper, the principal of traditional reactive current disturbance method is discussed. Then, a novel method based on reactive current disturbance is proposed. The proposed method applies a periodic reactive disturbing current and feeds forward the frequency. When the frequency changes, it further applies a positive feedback reactive disturbing current to bring the frequency out of limit. This method can detect is- landing quickly without Non-Detection Zone （NDZ）. It doesn＇t affect the frequency of grid or inject harmonic to grid and has minor impact of power factor. Simulation results verify the validity of the proposed method.

关 键 词：孤岛检测 无功电流扰动 三相光伏并网系统 分布式发电系统 正反馈 

分 类 号：TM615[电气工程—电力系统及自动化]