scholarly journals Parallel Iteration Method for Frequency Estimation Using Trigonometric Decomposition

10.5772/66778 ◽  
2017 ◽  
Author(s):  
He Wen ◽  
Junhao Zhang ◽  
Radek Martinek ◽  
Petr Bilik ◽  
Jan Zidek
Keyword(s):  
Iteration Method ◽  
Frequency Estimation ◽  
Parallel Iteration

Prior Rough Estimation and Trigonometric Decomposition Method for Frequency Estimation of Sine Wave Distorted by Noise

2019 ◽  
Vol 18 (01) ◽  
pp. 1950008
Author(s):  
Junwei Zhang ◽  
Qiuyan Zhang ◽  
Bo Zhang ◽  
Chao Ding
Keyword(s):  
Power Systems ◽  
Frequency Estimation ◽  
Sine Wave ◽  
Descent Method ◽  
Spectral Lines ◽  
Gradient Descent Method ◽  
Estimation Errors ◽  
Noise Simulation ◽  
Parallel Iteration ◽  
The Cost

Frequency estimation of sine wave distorted by noise plays an important role in modern power systems. The widely used windowed interpolation fast Fourier transform (WIFFT) can only reduce, but not completely remove, the estimation errors at the cost of an increment in the computation burden of frequency estimation. This paper proposes a frequency estimator by using the prior rough frequency estimation and trigonometric decomposition under white Gaussian noises. Firstly, a prior rough frequency is estimated by the three spectral lines WIFFT based on the Hanning window. Then, a parallel iteration of trigonometric decomposition is applied for the accurate frequency estimation. The gradient-descent method is used in the parallel iteration procedure, which can effectively restrain the interferences from harmonics and noise. Simulation and experiments results show that the proposed method can achieve accurate frequency estimation within one cycle.

Off-Grid Frequency Estimation with Random Measurements

2017 ◽  
Vol E100.A (11) ◽  
pp. 2493-2497
Author(s):  
Xushan CHEN ◽  
Jibin YANG ◽  
Meng SUN ◽  
Jianfeng LI
Keyword(s):  
Frequency Estimation ◽  
Random Measurements
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