电力系统自动化2017，Vol.41Issue(5)：114-120,7.DOI:10.7500/AEPS20160413007
低频电源注入式主动孤岛检测方案
Active Islanding Detection Scheme Based on Low-frequency Power Supply Injection
摘要
Abstract
The probability of islanding of grid-connected distributed generators is relatively large on the user side.Taking the user safety and power quality into account,the islanding mode should be detected quickly and accurately.An active islanding detection scheme based on 20 Hz low-frequency power supply injection is proposed.The 20 Hz component which is equivalent to zero sequence component is injected into the 380 V system and islanding is identified by the change characteristics of the 20 Hz component.The composition and detection principle of the proposed scheme,parameters selection and its influence on power quality are described and analyzed in detail.MATLAB is applied in the modeling and simulation,and correctness of the analysis is verified by simulation results.The identification criterion for the island mode based on comparison of the absolute value is proposed and realized in a grid-connected interface device.Finally,the scheme is experimentally verified in a small rooftop distributed photovoltaic generation project.关键词
孤岛检测/低频电源/20 Hz电压和电流/绝对值幅值比较/并网接口装置Key words
islanding detection/low-frequency power supply/20 Hz voltage and current/comparison of absolute amplitudes/grid-connected interface device引用本文复制引用
李瑞生,郭宝甫,曾正..低频电源注入式主动孤岛检测方案[J].电力系统自动化,2017,41(5):114-120,7.基金项目
国家高技术研究发展计划(863计划)资助项目(2015AA050104) （863计划）
国家电网公司科技项目(SGHADK00PJJS1500060).This work is supported by National High Technology Research and Development Program of China (863 Program)(No.2015AA050104) and State Grid Corporation of China (No.SGHADK00PJJS1500060). （SGHADK00PJJS1500060）
