光伏微网系统孤岛检测中的阻抗测量仿真  

Simulation for Impedance Measurement of Islanding Detection in Photovoltaic Micro-grid System

作　　者：肖龙[1] 杨国华[1] 周鑫[1] 姚琪[2] 朱向芬[1] 智腾飞[1] 王金梅[1] 

机构地区：[1]宁夏大学电气工程与自动化系,银川750021 [2]宁夏电力公司,银川750001

出　　处：《电力系统及其自动化学报》2013年第5期40-44,共5页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金项目(71263043);国家自然科学基金项目(51167015);宁夏回族自治区高等教育"质量工程"改革项目(2011JG-22);宁夏自治区自然基金项目(NZ12140)

摘　　要：针对目前有源孤岛检测法检测信道间相互干扰及注入扰动量对电能质量产生影响等不足之处,提出了一种基于阻抗测量原理的孤岛检测方法。介绍了阻抗测量法的检测原理及孤岛判定依据,分析了信号发生器的触发位置、触发角等因素对多分布式电源干扰的影响及抑制,探讨了短路脉冲电流信号对分布式电源出线端电压偏差的影响机理。利用Matlab/Simulink对系统孤岛、并网运行状态进行建模仿真,仿真结果表明利用阻抗测量法进行多信道检测可以显著抑制干扰,降低对电能质量的影响,有效实现孤岛检测。Aiming at the disadvantages of mutual interference between different detection channels of active detection and the influence on power quality due to the disturbance variable, a novel method based on impedance measurement is proposed for islanding detection. The detecting principle of the impedance measurement and the criterion for island- ing detection were illustrated, and the impacts and inhibition of different trigger local and trigger angle of signal gener- ator on multiple distributed powers were analyzed, and the dynamic mechanism of short impulse current for voltage de- viation of distributed generation terminal was studied. Matlab/Simulink was utilized to set up different detection sys- tems, and the simulation was processed afterward. The numerical illustration indicates that the proposed method is re- markably reliable on detecting islanding conditions, moreover, it can solve the interference problem in the multi-chan- nel detection, and reduce the impact on power quality.

关 键 词：孤岛检测 阻抗测量 多源微网 分布式电源 短路电流 

分 类 号：TM615[电气工程—电力系统及自动化]