摘要
为解决谐波电流检测算法问题,依据三相负载电流在αβ坐标系下的表现形式,提出了一种基于二阶广义积分器的谐波电流检测方法,适用于三相三线制对称和不对称系统。该方法通过Clark变换将三相电流信号转化为静止坐标系下的两相电流,再分别利用二阶广义积分器的特性提取基波电流分量,最后通过反Clark变换将基波电流分量变换成三相电流,与电网电流相减后得到谐波电流,便于工程中有源滤波器只对谐波电流进行补偿。仿真结果表明,该方法简单可靠、易于数字实现、检测效果好。
In order to solve the problems of detecting harmonic current,according to the pattern of three-phase load currents in αβ coordinate system,a method of detecting harmonic current based on second-order generalized integrator（SOGI） is presented,which fits for three-phase symmetrical system and asymmetrical system.The three-phase current signal is converted to two αβ componet through Clark transform.And the αβ fundamental components are extracted by SOGI.Then,the αβ fundamental components are transformed into three-phase fundamental components through inverse Clark transform.Finally,harmonic current is obtained by three-phase load currents subtract the three-phase fundamental components,which facilitates the active power filter to only compensate the harmonic current in projects.Simulation results show that this method offers simplicity of design,easier implementation by digital and high detection accuracy.
出处
《水电能源科学》
北大核心
2012年第5期142-144,214,共4页
Water Resources and Power
基金
上海市优秀青年教师科研专项基金资助项目(shu09019)
国家自然科学基金资助项目(51107079)
关键词
二阶广义积分器
有源电力滤波器
谐波检测
坐标变换
second-order generalized integrator
active power filter
harmonic detection
coordinate transformation
