Results 41 to 50 of about 215 (160)

A Stability Enhancement Method for Grid‐Forming Inverters With Inductor Current Feedforward and Coupling‐Enhancing Control

IET Power Electronics, Volume 19, Issue 1, January/December 2026.
A sequence impedance model of grid‐forming inverters is developed; a grid‐forming inverter's stabilisation strategy combining inductor current feedforward and coupling‐enhancing techniques is presented for strong‐grid applications. ABSTRACT Although the stable operation of grid‐forming inverters (GFMIs) in weak grids is well‐documented, undesirable ...
Xu Wu, Huafeng Xiao, Mingming Shi, Cunwen Tang, Wei Wang, Ming Cheng   +5 more
wiley   +1 more source

A Synchrophasor Estimation Method for Distribution Networks Using Sliding Fourier Transform and Parameter Residual Minimization

International Journal of Energy Research, Volume 2026, Issue 1, 2026.
Synchrophasor estimation in distribution networks faces significant challenges under complex signal conditions, such as frequency deviation, harmonic distortion, and nonstationary disturbances. To address these issues, an adaptive state estimation algorithm combining the sliding Fourier transform (SFT) and a spectrum‐driven estimation via minimization ...
Zengji Liu, Junjun Xu, Tengfei Zhang, Yeyi Ji, Qi Wang, Cheng Du   +5 more
wiley   +1 more source

PolarDoG–SlimVGG: A Novel Complex Power Quality Disturbance Classification Framework Based on Polar Coordinate Edge Detection and Attention‐Enhanced Convolutional Neural Network

Journal of Electrical and Computer Engineering, Volume 2026, Issue 1, 2026.
This study introduces PolarDoG–SlimVGG, a novel framework for the automated classification of complex quadruple power quality disturbances (PQDs). The proposed method combines PolarDoG, a feature extraction technique based on polar coordinate transformation and difference of Gaussians (DoG) edge detection, with a lightweight convolutional neural ...
Supakan Janthong, Pornchai Phukpattaranont, Prince Jain   +2 more
wiley   +1 more source

Modeling and Nonlinear Dynamic of Dual‐Rotor System With Misalignment During Aircraft Climbing Flight

Shock and Vibration, Volume 2026, Issue 1, 2026.
Misalignment of the dual‐rotor system in aeroengines may lead to abnormal vibration and rubbing faults between the rotor and the stator. The dynamic model of the dual‐rotor system with misalignment during aircraft climbing flight is presented in this paper. The dynamic equation of the dual‐rotor system is obtained from the Lagrange equation.
Guofang Nan, Jinrui Hu, Jingya Yao, Chen Zhang, Bodong Zhang, Antonio Giuffrida   +5 more
wiley   +1 more source

CURRENTS OF SINGLE-PHASE INDUCTION MOTORS SUPPLIED WITH VOLTAGE CONTAINING INTERHARMONICS

Scientific Journal of Gdynia Maritime University
In real power systems the voltage waveform is not a perfect sine, but contains various additional frequency components, like harmonics, and in some power systems also subharmonics and interharmonics, that are components of frequency less than the ...
Marcin Pepliński, Piotr Gnaciński
doaj   +1 more source

The Influence of Power Network Disturbances on Short Delayed Estimation of Fundamental Frequency Based on IpDFT Method with GMSD Windows

Energies, 2021
This paper presents an application of the IpDFT spectrum interpolation method to estimate the fundamental frequency of a power waveform. Zero-crossing method (ZC) with signal prefiltering was used as a reference method.
Józef Borkowski, Mirosław Szmajda, Janusz Mroczka   +2 more
doaj   +1 more source

Optimal control of single‐phase microgrid with photovoltaic and energy storage for improving operation performance and seamless state transition

Energy Conversion and Economics, Volume 6, Issue 5, Page 324-340, October 2025.
Abstract Under voltage sags, swells, stochastic load profiles and harmonic voltage distortion, conventional synchronisation mechanisms often fail to track the grid voltage immediately and accurately, leading to degraded control performance and potential power quality violations.
Shiv Shambhu Choudhary, Tripurari Nath Gupta   +1 more
wiley   +1 more source

Grid Integration of Single‐Phase Inverters Using a Robust PLL‐Less Control Strategy for Renewable Energy Applications

Energy Science &Engineering, Volume 13, Issue 9, Page 4539-4552, September 2025.
ABSTRACT In this paper, a PLL‐less control technique for single‐phase grid‐connected voltage source converter (VSC) system is proposed that overcomes shortcomings in traditional PLL‐based and existing PLL‐less techniques. The proposed method avoids the use of a PLL and thus significantly decreases the computational complexity of the system as well as ...
Adnan Tan
wiley   +1 more source

Kullback–Leibler Divergence‐Based Fault Detection Scheme for 100% Inverter Interfaced Autonomous Microgrids

Energy Science &Engineering, Volume 13, Issue 6, Page 2891-2900, June 2025.
ABSTRACT The development of a dependable and secure protection system is critical for further integration of renewable energy sources into electrical energy systems. To address the bidirectional power flow and limited fault current contribution of 100% inverter‐based microgrids, this article presents a differential fault detection scheme (DFDI) based ...
Ali Mallahi, Iman Sadeghkhani
wiley   +1 more source

Phasor Estimation of Transient Electrical Signals Using Modified Covariance Enhanced Cleaned Characteristic Harmonic Filtering in Protection Relay

Energies
Modern protection relays require accurate and fast phasor estimation under harsh transient conditions, including a decaying DC component, harmonics, interharmonics, noise, and frequency instability.
Natheer Alwan, Veljko Papic
doaj   +1 more source