Journal ArticleDOI
Frequency Estimation of Three-Phase Power System Using Weighted-Least-Square Algorithm and Adaptive FIR Filtering
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TLDR
A new technique for estimation of the instantaneous frequency based on simultaneous sampling of three-phase voltage signals is presented, which provides better performance, compared with the technique based on a single-phase signal in relation to waveforms with noise.Abstract:
A new technique for estimation of the instantaneous frequency based on simultaneous sampling of three-phase voltage signals is presented. The structure consists of two decoupled modules: the first is for adaptive filtering of input signals, and the second is for frequency estimation. A suitable and robust algorithm for frequency estimation is obtained. This technique provides better performance, compared with the technique based on a single-phase signal in relation to waveforms with noise. The technique is particularly important when asymmetric sags generate zero voltage in one of the three phases. In addition, it allows the measurement of the instantaneous frequency value of real signals for single- or three-phase systems. To demonstrate the performance of the developed algorithm, computer-simulated data records and calibrator-generated signals are processed. The proposed algorithm has been put to test with distorted three-phase voltage signals.read more
Citations
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Journal ArticleDOI
Design-Oriented Study of Advanced Synchronous Reference Frame Phase-Locked Loops
TL;DR: A comprehensive design-oriented study of the multiple reference frame-based and dual second-order generalized integrator-based PLLs, which simplifies the parameter design and the stability analysis and the experimental results are presented to support the theoretical analysis.
Journal ArticleDOI
Harmonics estimation in emerging power system: Key issues and challenges
TL;DR: In this article, several methods of power system harmonics estimation are critically reviewed and classified based on the type of analysis tool and applications and the key issues and challenges in harmonics estimations are highlighted.
Journal ArticleDOI
Adaptive Frequency Estimation in Smart Grid Applications: Exploiting Noncircularity and Widely Linear Adaptive Estimators
TL;DR: This article introduces a unified framework for the estimation of instantaneous frequency in both balanced and unbalanced conditions in a three-phase system, thus consolidating the existing approaches and providing next-generation solutions capable of joint adaptive frequency estimation and system fault identification.
Journal ArticleDOI
EMD-Based Filtering Using Similarity Measure Between Probability Density Functions of IMFs
TL;DR: A new signal-filtering, which combines the empirical mode decomposition (EMD) and a similarity measure, to make use of partial reconstruction, the relevant modes being selected on the basis of a striking similarity between the pdf of the input signal and that of each mode.
Journal ArticleDOI
Accurate Estimation of Single-Phase Grid Voltage Parameters Under Distorted Conditions
TL;DR: In this article, an accurate technique for the estimation of single-phase grid voltage fundamental amplitude and frequency is presented, consisting of a quadrature signal generator (QSG) and a discrete Fourier transform (DFT).
References
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Journal ArticleDOI
Decoupled Double Synchronous Reference Frame PLL for Power Converters Control
TL;DR: In this article, a decoupled double synchronous reference frame phase-locked loop (DDSRF-PLL) was proposed to detect the fundamental-frequency positive-sequence component of the utility voltage under unbalanced and distorted conditions.
Journal ArticleDOI
A phase tracking system for three phase utility interface inverters
TL;DR: In this article, the phase tracking system of the three phase utility interface inverters is investigated in both continuous and discrete-time domains, and the optimization method is considered for the second order PLL system.
Journal ArticleDOI
Operation of a phase locked loop system under distorted utility conditions
TL;DR: In this article, a phase-locked loop (PLL) system under distorted utility conditions is presented and a control model of the PLL system is developed and recommendations are made on tuning of this model specially for operation under common utility distortions such as line notching, voltage unbalance/loss, and frequency variations.
Journal ArticleDOI
A novel Kalman filter for frequency estimation of distorted signals in power systems
TL;DR: It has been found that the proposed algorithm is suitable for real-time applications especially when the frequency changes are abrupt and the signal is corrupted with noise and other disturbances due to harmonics.
Journal ArticleDOI
Analysis and Software Implementation of a Robust Synchronizing PLL Circuit Based on the pq Theory
TL;DR: The analysis and software implementation of a robust synchronizing circuit, i.e., phase-locked loop (PLL) circuit, designed for use in the controller of active power line conditioners, and it is shown that the PLL can fail in tracking the system voltage during startup under some adverse conditions.