scholarly journals Adaptive Filtering-Based Pseudo Open-Loop Three-Phase Grid-Synchronization Technique

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2927 ◽  
Author(s):  
Hafiz Ahmed ◽  
Samet Biricik ◽  
Elhoussin Elbouchikhi ◽  
Mohamed Benbouzid
Keyword(s):  
Adaptive Filtering ◽  
Adaptive Filters ◽  
Frequency Estimation ◽  
Open Loop ◽  
Phase System ◽  
Comparative Performance ◽  
Reduced Order ◽  
Grid Synchronization ◽  
Synchronization Problem ◽  
Three Phase

This paper studies the grid-synchronization problem of three-phase system. Second-order adaptive filters are a popular tool for grid-synchronization. In this context, reduced-order generalized integrator has attracted some attention in recent time. However, existing implementations cannot control directly the closed-loop poles (real and imaginary) of reduced-order generalized integrator. To overcome this limitation, this paper proposes a novel reduced-order generalized integrator structure. To make the proposed technique frequency adaptive, an open-loop frequency estimation technique is also used. Comparative performance analysis are provided over two other advanced and recently proposed techniques. Results demonstrate the suitability and effectiveness of the proposed technique.

An Improved Hybrid Prefiltered Open-Loop Algorithm for Three-Phase Grid Synchronization

2021 ◽  
Vol 68 (3) ◽  
pp. 2480-2490 ◽  
Author(s):  
Anant Kumar Verma ◽  
Raj Kumar Jarial ◽  
Pedro Roncero-Sanchez ◽  
Mohan Rao Ungarala ◽  
Josep M. Guerrero
Keyword(s):  
Open Loop ◽  
Grid Synchronization ◽  
Three Phase

scholarly journals Accurate Parameter Estimation for Unbalanced Three-Phase System

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Yuan Chen ◽  
Hing Cheung So
Keyword(s):  
Parameter Estimation ◽  
Frequency Estimation ◽  
Nonlinear Least Squares ◽  
Phase System ◽  
Mean Square ◽  
Least Mean Square ◽  
Error Performance ◽  
Control Console ◽  
Three Phase ◽  
And Control

Smart grid is an intelligent power generation and control console in modern electricity networks, where the unbalanced three-phase power system is the commonly used model. Here, parameter estimation for this system is addressed. After converting the three-phase waveforms into a pair of orthogonal signals via theαβ-transformation, the nonlinear least squares (NLS) estimator is developed for accurately finding the frequency, phase, and voltage parameters. The estimator is realized by the Newton-Raphson scheme, whose global convergence is studied in this paper. Computer simulations show that the mean square error performance of NLS method can attain the Cramér-Rao lower bound. Moreover, our proposal provides more accurate frequency estimation when compared with the complex least mean square (CLMS) and augmented CLMS.

Realization of Enhanced LMS Filter Using Carry Skip Adder And Quantum Dot Cellular Automation In VLSI For Removing Impulse Noises In Medical Image

2019 ◽  
Vol 14 ◽  
Author(s):  
K.R. Shankarkumar ◽  
Gokul Kumar
Keyword(s):  
Adaptive Filtering ◽  
Adaptive Filters ◽  
Pass Band ◽  
Least Mean Square ◽  
Low Pass ◽  
Parallel Prefix ◽  
Loop Feedback ◽  
Band Pass ◽  
The Difference ◽  
Prefix Adder

: Filtering is an important step in the field of image processing to suppress the required parts or to remove any artifacts present in it. There are different types of filters like low pass, high pass, Band pass, IIR, FIR and adaptive filtering etc.., in these filters adaptive filters is an important filter because it is used to remove the noisy signal and images. Least Mean Square filter is a type of an adaptive filtering which is used to remove the noises present in the medical images. The working of LMS is based on the minimization of the difference between the error images using a closed loop feedback. Therefore presented technique called as Q-CSKA. Here the CSKA performs its operation in stages which is based on the nucleus stage. In the traditional CSKA the nucleus stage is depend on the parallel prefix adder in this work it is replaced by the QCA adder. The QCA adder utilizes the less area compared to PPA and it can be realized in Nanometer range also. For multiplexers, And OR Invert, OR and Invert logic is used to reduce the area and delay. Due to these advantages of the QCA, AOI-OAI logic the proposed method outperformed the LMS implementation in area, power, and accuracy and delay, this based five type image noise of medical pictures related to the best technique is out comes. It helps to medicinal practitioner to resolve the symptoms of patient with ease.

Robust Adaptive Frequency Estimation of Three-Phase Power Systems

2010 ◽  
Vol 59 (7) ◽  
pp. 1793-1802 ◽  
Author(s):  
Mohsen Mojiri ◽  
Davood Yazdani ◽  
Alireza Bakhshai
Keyword(s):  
Power Systems ◽  
Frequency Estimation ◽  
Three Phase ◽  
Robust Adaptive
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