Zero crossing determination by linear interpolation of sampled sinusoidal signals
Zero crossing determination by linear interpolation of sampled sinusoidal signals
复制标题
通过采样正弦信号的线性插值确定过零
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
E. Ribeiro
中科院分区：
文献类型：
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作者：
G.E. Mog;E. Ribeiro
测量和监测交流电力系统的质量参数需要进行多次计算，如实际频率和三相之间的相对相角。这些计算必须产生符合功能要求的精确值；对于同步功能，频率误差必须小于0.01赫兹，相角误差必须小于1度。要执行这些计算，必须确定每个被监测信号的过零时刻。传统方法使用硬件电路来执行这些确定，从而导致高成本的系统，因为每个被监视的信号必须具有其自己的电路。平均并不是一个好的选择，因为需要很长的时间，而且相角精度没有改善。本文的目的是介绍一种低成本的单周期方法，利用监测信号的样本，在DSP中通过软件执行这些计算。
Measuring and monitoring quality parameters of AC power systems requires several calculations, such the actual frequency and relative phase angles between each one of the three phases. These calculations must result in accurate values to comply with the function requirements; for synchronism function, frequency inaccuracy must be less than 0.01 Hz, and phase angle inaccuracy must be less than one degree. To perform these calculations, the zero crossing instants must be determined for each monitored signal. Conventional methods use a hardware circuit to perform these determinations resulting a high-cost system, because each monitored signal must have its own circuit. Averaging is not a good alternative due to the long time required besides there is no improvement in phase angle accuracy. The purpose of this article is to introduce a low-cost one cycle method to perform these calculations by software in a DSP using samples of the monitored signals.