一种改进的FBD指令电流检测方法研究  

Research on the improved directive current detecting method based on FBD

作　　者：黄知超[1] 苏晓鹏[1] 李俊[2] 刘超攀 

机构地区：[1]桂林电子科技大学 [2]广西电网公司桂林供电局

出　　处：《电测与仪表》2015年第6期33-38,共6页Electrical Measurement & Instrumentation

基　　金：广西制造系统与先进制造技术重点实验室(13-051-09-001Z);南方电网公司科技项目(K-GX2013-128);广西研究生教育创新计划(XJYC2012008);广西科学与技术开发项目(桂科攻:14122007-1)

摘　　要：在有源滤波器设计中,指令电流的检测是控制与补偿的关键技术环节。在三相电压不对称情况下,由于a相电压与其正序电压之间存在相位差,使传统FBD检测法在提取指令电流时存在误差,针对此不足提出一种改进的FBD检测法,该方法通过瞬时对称分量法检测电网电压基波正序分量的相位,减小了因三相电压不对称而导致的检测误差,同时引入电流平均值理论提取等效电导的直流分量,提高了指令电流检测的动态响应能力。仿真结果表明,基于改进FBD法的有源滤波器能够快速准确地检测和补偿三相不对称系统中的谐波和无功电流。The detection of the directive current is the critical technology of control and compensation in the design of active power filters （APF）.Because of the phase difference between the a-phase voltage and its positive sequence voltage in the three-phase asymmetry system,the directive current cannot be detected accurately by the traditional FBD method.In view of this,an improved FBD detecting method was proposed.This method detected the phase of the fundamental positive-sequence voltage by instantaneous symmetrical components,which reduced the detection error caused by the three-phase voltage asymmetry,and introduced the current mean value theory to extract the DC component of equivalent conductance,so as to improve the dynamic response capability of the directive current detection.The simulation results verified that the APF based on the improved FBD could effectively and accurately detect and compensate for the harmonic and reactive current in the three-phase asymmetrical system.

关 键 词：三相不对称系统 FBD法 瞬时对称分量 平均值理论 

分 类 号：TM714[电气工程—电力系统及自动化]