C代码接口在频率变化时交流采样中的应用

The use of CIN in AC sampling when frequency is unsteady

电力系统交流参数计算中常采用的算法是均方根法,但在信号频率变化时会产生较大误差。分析了引起误差的原因,并在基于LabVIEW的交流采样系统中,提出了改进算法,并利用LabVIEW下C语言代码接口技术较好的解决了这个问题。

Mean square root method is often used in AC sampling computing of power system. However, considerable errors will occur when system frequency is changing. The paper analyses the factors which cause the errors, proposes an improved computing method based on LabVIEW in AC sampling computing of power system , and solved the problem preferably by calling C in LabVIEW.