Power Frequency Measuring Method Based on Linear Interpolatio
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摘要: 针对常用的硬件测频法和软件测频法分别存在硬件设计复杂、软件测量误差较大的问题，提出了一种基于线性插值的电网频率测量方法。该方法首先找出半波内与第一个过零点最近的2个采样点，利用线性插值算出该过零点与后一个采样点之间的时间T1；其次找出半波内与下一个过零点最近的2个采样点，利用线性插值算出该过零点与前一个采样点之间的时间T3；再次计算半波内第一个和最后一个采样点之间的时间T2；最后将T1、T2、T3相加，即可算出电网频率f。测试结果表明，该方法测量误差为±0.05 Hz，且计算过程简单。Abstract: In view of problems of complex design in hardware and big measuring error in software respectively existed in frequency measuring methods with hardware and software, the paper proposed a power frequency measuring method based on linear interpolation. Firstly, the method finds two nearest sampling points to the first zero-crossing point in half-wave and uses linear interpolation to calculate T1 between the zero-crossing point and the later sampling point. Then it finds two nearest sampling points to the next zero-crossing point in half-wave and uses linear interpolation to calculate T3 between the zero-crossing point and the former sampling point. And then it calculates T2 between the first sampling point and the latest one. At last, it calculates power frequency f by adding T1, T2 and T3. The test result showed that measuring error of the method is ±0.05 Hz with simple calculation process.
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