摘要
针对有源电力滤波器(APF)谐波抑制效果在很大程度上取决于对电网中无功、谐波和负序电流快速而准确监测的问题,提出一种用于无功、谐波和负序电流检测的改进的同步参考坐标法。将采样得到的三相电网电压变换到α-β坐标系,由相关分量合成所得矢量就是电网正序基波分量和负序基波分量的叠加,进而得到理想的基波电压,可计算出cosθ、sinθ。所提出的方法通过对电网正序基波电压矢量的同步旋转跟踪,可以省去锁相环及三角函数的计算。采用Matlab软件仿真及实验模拟三相不平衡负载的检测,结果均证明了采用所提方法的APF具有良好的补偿性能。
The harmonic suppression effect of APF（Active Power Filter） depends mainly on the fast and precise detection of reactive power, harmonics and negative- sequence current of power grid. An improved synchronous-reference-frame method is presented for it. The sampled three-phase voltages are transformed onto αβ coordinates system and the compounded vector of relevant components is thus the synthesis of positive- sequence and negative- sequence fundamental components,from which the desired fundamental voltage is obtained and the cos θ and sin θ are then calculated. By synchronous tracing of the positive sequence fundamental voltage vector,the phase locked loop and sinusoidal function calculations are omitted. Simulation with Matlab and experiment for the detection of three- phase unbalanced load verify the perfect filtering performance of APF.
出处
《电力自动化设备》
EI
CSCD
北大核心
2009年第11期41-44,共4页
Electric Power Automation Equipment
基金
湖南省计划科研项目(2007sk3014)
湖南省教育厅重点科研项目(06A066)~~
关键词
有源电力滤波器
电流检测
同步参考坐标变换
正序基波提取器
电压变换
active power filter
current detection
synchronous- reference- frame method
fundamental positive-sequence voltage detector
voltage converter
