一种改进的主动频率偏移孤岛检测算法  

An Improved Active Frequency Drift Method of Islanding Detection

作　　者：陈佳斌[1] 陈阿莲[1] CHENJiabin CHEN Alian(School of Control Science and Engineering, Shandong University, Ji’nan 250061, China)

机构地区：[1]山东大学控制科学与工程学院,济南250061

出　　处：《电源学报》2017年第3期140-147,共8页Journal of Power Supply

基　　金：国家自然科学基金资助项目(51377101);教育部新世纪优秀人才支持计划资助项目(NCET-13-0339)~~

摘　　要：孤岛检测是光伏并网系统必须具备的功能之一,要求其能快速准确地检测出孤岛的发生,并且要尽量减少对电网质量的影响。本文分析了现有孤岛检测算法在谐波畸变率与检测速度、检测盲区上存在的固有矛盾,并提出了一种改进的主动频率偏移孤岛检测算法。在低频率差时采用固定反馈系数,保证了良好的电能质量;在较高频率差时采用基于三次幂函数变化的反馈系数,保证了孤岛检测的准确性和快速性。该方法能有效降低主动式孤岛检测对电能质量的不良影响,快速检测出孤岛的发生,并且不会增大检测盲区。仿真与实验结果证明了该方法的有效性。The islanding detection is one of the necessary functions of the photovoltaic （PY） grid-connected system, which should rapidly and accurately detect the occurrence of islanding, and minimize the impact on the quality of power grid. To the highly existing algorithm of distortion rate and slow speed of detection, this paper proposes a new island low distortion rate of fast detection algorithm, which is using fixed coefficient in low different frequency and using the three times of power function in high different frequency. This method can effectively reduce the bad influence of active island detection of power quality, and reach the requirement of rapid detection of island under the same non-detection zone （NDZ）. Simulation and experimental results demonstrate the effectiveness of the proposed method.

关 键 词：孤岛检测 检测盲区 谐波畸变率 变截断系数 

分 类 号：TM615[电气工程—电力系统及自动化]