改进的谐波和无功电流检测方法  

Improvement of harmonic and reactive current detection method

作　　者：康小燕[1] 董爱华[1] 王运毅 

机构地区：[1]河南理工大学电气与自动化学院,河南焦作454000 [2]国电荥阳煤电一体化有限公司,郑州450100

出　　处：《电测与仪表》2015年第23期29-33,42,共6页Electrical Measurement & Instrumentation

基　　金：国家自然基金青年基金项目(61104079)

摘　　要：三相电压不对称时,由于A相正序电压与A相电压存在相位差,使传统ip-iq法检测的无功电流有误差,同时低通滤波器的存在使得检测产生延时,因此,文中提出了一种改进的ip-iq无功电流检测法。该改进法利用延时法来快速获取A相电压的正序分量,然后利用正序基波提取器获得电流正序基波信号,省去了滤波器环节。文中利用了Matlab/Simulink仿真软件进行建模仿真,仿真结果表明,该改进法在三相电网电压不对称时能准确、实时地实现谐波和无功电流的检测。For three-phase system, in the case of asymmetrical three-phase voltage, because of the phase difference between A phase sequence voltage and A phase voltage, the phase-lock loop in the traditional ip-iq detecting method cannot be used to detect the phase of the positive sequence voltage. At the same time, the existence of low-pass filter makes the detection delayed. To solve this problem, an improved ip-iq reactive current detection method is put forward in this paper. In this method, the improved method obtains the positive sequence component A phase voltage by using time delay method. Meanwhile, the wave of positive sequence extractor instead of low-pass filter is used to attain the wave of positive sequence signal of current, so the filter link is eliminated. In this paper, the Matlab/Simulink simu- lation software is used for modeling and simulation. The simulation results show that the improved reactive current de- tection in the asymmetric three-phase grid voltage can implement harmonic and reactive current real-time detection ac- curately in the static reactive power generator.

关 键 词：相位差 低通滤波器 延时法 正序基波提取器 

分 类 号：TM714.5[电气工程—电力系统及自动化]