软件设计中减小交流采样测量功率因数误差的一些方法

Some Methods for Software Design to Improve Precision of Power Factor Measurement

在利用交流采样得来的数据进行功率因数角的计算过程中,软件设计对计算结果有很大的影响。本文从减小同步误差、减小频差序数和减小舍入误差等三个方面入手,减小功率因数角的计算误差。经仿真和实际运行,应用这些方法可以在十六位字长定点计算的处理器上,有效的降低噪声和谐波的干扰,提高功率因数角测量的精度。

Software design can affect the precision in calculation of power factor, which is made from AC sampling. This article discussed the method to reduce the error of the calculation from three aspects： error by not in-phase, difference in sample frequency and ideal sample frequency, and finite register length effects. The results of emulation and running on chip showed that the software can improve the precision in calculation of power factor effectively.