交流电失真度测量方法研究与实现

Research and Implementation of AC Distortion Factor Measurement

曲线拟合法从原理上能够实现正弦信号失真度计算,但正弦曲线拟合是一个四参数优化问题,传统算法在求取全局最优解时对初值敏感并容易陷入局部极值,这限制了曲线拟合法在失真度测量中的应用。针对正弦曲线拟合困难的问题,提出了一种三参数曲线拟合算法,设计并实现了一款基于ARM的交流电失真度测量仪,并对其硬件和软件设计中的关键技术进行了说明。测试表明,该方法能够完成交流电失真度的测量,设备运行稳定,满足应用要求。

The sine wave distortion factor can be calculated by the curve- fitting method theoretically,but the sine wave curve- fitting is a four- parameter optimization problem,which makes the traditional algorithm easily fall into local extremum in calculating the globally optimal solution since it is sensitive to the initial value. Thus this will limit the application of curve- fitting in distortion factor calculation. Aiming at such a problem,a three- parameter curve- fitfting method has been introduced. Then an ARM based AC distortion factor measurement has been developed and the key technology in hardware and software design has been illustrated. Experimental results show that the method can complete the AC distortion factor measurement and meet the application requirements.