Novel Three-Point Interpolation DFT Method for Frequency Measurement of Sine-Wave

Inter‐harmonic parameters estimation in power grid based on accelerated PSO and T 5 R 11 window

“…3. For example, by using the methods in [5,6], the REs of estimators are all <10 −11 , whereas they deteriorate to a degree from 10 −1 to 10 −5 , due to MLI. Therefore, an extra PSO is necessary to optimise the accuracy further.…”

“…Harmonics detection and parameters estimation are both important tasks in power quality research [1][2][3]. Many types of researches [4][5][6][7][8][9] dealing with harmonic problems mainly focus on methods based on windowed and interpolated DFT (WIpDFT-based or IpDFTbased method). Commonly, they contain a similar structure.…”

“…When a phase jump happens, the voltage can be adjusted to the new level in about 20 ms. By using a digital signal processor (DSP) with a TMS320C6713 processor, the parameters can be estimated in real time in practical applications. In the literature [6], a specific MSD window with a three-point interpolation method was adopted, and the variance of frequency reaches to about 10 −4 in a 20 dB environment. The algorithm in [6] mainly aimed at the frequency measurement.…”

“…In the literature [6], a specific MSD window with a three-point interpolation method was adopted, and the variance of frequency reaches to about 10 −4 in a 20 dB environment. The algorithm in [6] mainly aimed at the frequency measurement. It is noteworthy that many powerful IpDFT-based algorithms in other papers [7][8][9] are analysed and compared in [6], hence a comprehensive view of the IpDFT-based routine can be obtained according to the analysis and conclusion.…”

Fast and accurate frequency estimation in distorted grids using a three‐sample based algorithm

“…To reduce the harmful results of lower order harmonics, a complex LS can be merged with the DFT [18]. Three‐point interpolated DFT can be useful under noisy conditions [19, 20]. An approach based on the Clarke transformation and the DFT for frequency estimation of single‐phase grids is reported in [21].…”