基于DSP的嵌入式介损测量装置的实现

Embedded Dielectric Loss Angle Measurement Device Based on DSP

电力系统频率偏离50Hz时,常规的傅立叶变换用于频谱分析时易产生频谱泄露和栅栏效应,使介损角计算产生误差。加Hanning插值的谐波分析法通过加窗和插值能有效减轻频率偏离50Hz时的频谱泄露和栅栏效应,但在数字信号处理器上不易实现。本文提出了一种改进的基于加汉宁窗的谐波分析法应用于基于DSP的介损角在线监测装置。实验结果表明,该方法在减小计算量的同时具有较好的测量精度。

If power frequency deviates from 50Hz,ordinary Fourier transform is easy to generate spectral leakage and fence effect when it is used for spectral analysis,and it will cause the error of dielectric loss angle measurement.The Hanning windowed interpolated algorithm uses windowing and interpolation to alleviate spectral leakage and fence effect effectively when the signal frequency deviates from50Hz.However,the algorithm is hard to realization based on DSP. An improvement harmonic analysis method based on hanning windowing is proposed to loss angle measurement device based on DSP. The result proves that this method can not only reduce computational complexity but also increase the accuracy of calculating.