分布式电源中三次谐波扰动孤岛检测方法的研究  

Research on third harmonic disturbance islanding detection method for distributed generation

作　　者：赵耀[1] 赵庚申[1] 陈曦[1] 程如岐[1] 郭天勇[1] 刘国良[1] 

机构地区：[1]南开大学光电子薄膜器件与技术研究所,光电子薄膜器件与技术天津市重点实验室,天津300071

出　　处：《电力系统保护与控制》2013年第8期54-60,共7页Power System Protection and Control

基　　金：天津市基础重点基金(11JCZDJC22900)

摘　　要：针对现有孤岛检测方法注入谐波复杂、响应速度慢等问题,提出了一种分布式电源三次谐波扰动孤岛检测方法。该方法以分布式电源接入电网处电压的三次谐波作为检测对象,通过设计的正反馈控制器使孤岛运行时三次谐波迅速累积,超出阈值时则认为发生孤岛。同时针对该方法在电网电压波形畸变时输出谐波电流较大的缺点设计了前馈控制器,在进行孤岛检测的同时降低了并网谐波电流含量。通过matlab/simulink进行了孤岛保护仿真测试,结果表明该方法响应速度快,注入谐波简单可控,前馈模式可以有效降低并网电流谐波含量。通过样机实验证明了该方法的实用性。As the existing islanding detection methods have problems such as complex injected harmonics and slow response, a third harmonic disturbance islanding detection method for distributed generation is proposed. Taking the voltage third harmonic at the point that distributed generation connected to the power grid as checking object, a positive feedback controller is designed to increase the third harmonic rapidly under the islanding condition, and the islanding is determined once the third harmonic exceeds the threshold value. Because this method has the disadvantage that the output harmonic current is large while the grid voltage waveform distorted, a feedforward controller is designed to detect the islanding as well as to reduce the current harmonic content. The result of islanding protection simulation test by the matlab/simulink shows this method has fast response while harmonic injection is simple and controllable, and the harmonic content of output current can be effectively reduced by the feedforward controller. This method is proved to be practical by prototype experiment.

关 键 词：分布式电源 并网 孤岛检测 三次谐波 正反馈 谐波补偿 

分 类 号：TM935[电气工程—电力电子与电力传动]