摘要
以DFT为基础的电力谐波分析方法在谐波分析仪中得到了广泛的应用,由于电网的复杂性和实际采样频率的误差而产生的频谱泄露问题严重的影响了谐波分析的准确性。提出了基于序列域频率采样速率变换的方法以适应实际中信号参数的变化,有效的解决了此问题。该方法通过过零触发启动给定点数的采样,在序列域通过测量实际输入周期来确定采样速率变化因子并进行速率变换,实现了采样的同步,有效的克服频谱泄露问题。最后,通过仿真和实际数据处理验证了该法的有效性。
The power harmonic analysis method based on DFT has been widely used in the harmonic analyzer,but the accuracy of the analysis accuracy is seriously affected by the spectrum leakage due to the complexity of the grid and the error of sampling frequency. The paper presents a new method which used the sampling rate conversion in samples domain to adapt the changes of parameters of grid signals in practical to overcome the problems effectively. The sampling of given number was started by the zero-crossing trigger,the period of grid signals and the sampling rate change factor were measured by samples（ the measuring results also reflected the relative errors）; the spectrum leakage problems were overcome after the sampling synchronization by rate conversion. At last,the effectiveness of the method is verified through simulation and actual data processing.
出处
《电测与仪表》
北大核心
2015年第3期26-30,共5页
Electrical Measurement & Instrumentation
基金
陕西省教育厅(11JK1015)
咸阳市科技局(2012k03-08)
陕西科技大学(BJ11-06)
关键词
电力谐波
频谱泄露
采样速率变换
DFT
power harmonic
spectrum leakage
sampling rate conversion
DFT
