基于零序电压正反馈控制的多分布式电源孤岛检测方法  

Multi-distributed Generation Island Detection Method Based on Zero-sequence Voltage Positive Feedback Control

作　　者：张军 张新慧[1] 彭克[1] 程梦竹 李文龙 王锐 ZHANG Jun;ZHANG Xinhui;PENG Ke;CHENG Mengzhu;LI Wenlong;WANG Rui(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China;Linyi Power Supply Company,State Grid Shandong Electric Power Company,Linyi 276000,China)

机构地区：[1]山东理工大学电气与电子工程学院,淄博255000 [2]国网山东省电力公司临沂供电公司,临沂276000

出　　处：《高电压技术》2023年第7期3040-3050,共11页High Voltage Engineering

基　　金：国家自然科学基金(51807112)。

摘　　要：为了解决因稀释效应导致多分布式电源(distributed generation,DG)孤岛检测失败的问题,提出了一种基于零序电压正反馈控制的多DG孤岛检测新方法。该方法根据DG并网点三相电压和零序电压的相位关系,利用正弦脉宽调制技术控制逆变器输出侧电压的相位,使其对DG并网点零序电压的幅值进行正反馈扰动;利用各DG并网点零序电压与相电压相位关系的一致性,控制其向并网点注入扰动方向一致的扰动量,从而消除因各DG扰动方向相反产生的稀释效应。MATLAB/Simulink建模仿真和RTBOX物理实验结果表明:该方法能够消除稀释效应,实现多DG孤岛检测。所提方法能够降低DG引起“反送电”现象发生的概率,保障检修人员的人身安全。In order to solve the problem of multi-distributed generation(DG)islanding detection failure caused by dilution effect,a new multi-DG islanding detection method based on zero-sequence voltage positive feedback control is proposed.According to the phase relationship between the three-phase voltage and the zero-sequence voltage at the point of common coupling of the DG,in the method,the sinusoidal pulse width modulation technology is adopted to control the phase of the voltage at the output side of the inverter to realize the positive feedback disturbance of the zero-sequence voltage amplitude.The voltages of the grid-connected points are the same,therefore,the phase relationship between the zero-sequence voltage and the phase voltage can be used to control the amount of disturbance injected by each DG into the grid-connected point with the same disturbance direction,thereby eliminating the dilution effect caused by the opposite direction of disturbance of each DG.MATLAB/Simulink for simulating and RTBOX for physical experiment results show that the dilution effect can be eliminated and multiple DG islands can be detected by this method.The proposed method can be adopted to reduce the occurrence probability of“reverse power transmission”caused by DG access,and to ensure the personal safety of maintenance personnel.

关 键 词：配电网 多分布式电源 孤岛检测 零序电压正反馈 稀释效应 主/被动结合 

分 类 号：TD61[矿业工程—矿山机电]