Results 21 to 30 of about 19,040 (262)

Coupled Harmonic Admittance Identification Based on Least Square Estimation

Energies, 2018
Norton equivalent circuit is a commonly used model in estimating harmonic current emissions of harmonic sources. It however cannot reflect the mutual coupling relationships among voltage and current in different harmonic orders. This paper proposes a new
Yaqiong Li, Zhanfeng Deng, Tongxun Wang, Guoliang Zhao, Shengjun Zhou   +4 more
doaj   +1 more source

Interactive lighting editing system for single indoor low-light scene images with corresponding depth maps

Visual Informatics, 2022
We propose a novel interactive lighting editing system for lighting a single indoor RGB image based on spherical harmonic lighting. It allows users to intuitively edit illumination and relight the complicated low-light indoor scene.
Zhongyun Bao, Gang Fu, Lian Duan, Chunxia Xiao   +3 more
doaj   +1 more source

Fast Real-Time RDFT- and GDFT-Based Direct Fault Diagnosis of Induction Motor Drive

Energies, 2022
This paper presents the theoretical analysis and experimental verification of a direct fault harmonic identification approach in a converter-fed electric drive for automated diagnosis purposes.
Piotr Kołodziejek, Daniel Wachowiak
doaj   +1 more source

Harmonic Current Estimation of Unmonitored Harmonic Sources With a Novel Oversampling Technique for Limited Datasets

IEEE Access, 2022
In modern power systems, harmonics are amongst the significant issues attributed to renewable energy sources and nonlinear loads. Direct harmonic monitoring of the entire power system may be too costly or impractical, and measured data could be limited ...
Ahmadreza Eslami, Michael Negnevitsky, Evan Franklin, Sarah Lyden   +3 more
doaj   +1 more source

Determination of harmonic current contributions based on robust state estimation

TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES, 2018
In this paper, a state estimation based method is proposed to determine harmonic current contributions of plants supplied from a point of common coupling (PCC). This work mainly aims to reduce gross error of capacitive voltage transformer (CVT) measurements at harmonic frequencies using robust weighted least absolute value (WLAV) state estimation ...
Erhan Sezgin, Murat Göl, Özgül Salor
openaire   +3 more sources

Research on Emergency Frequency Control in AC/DC Hybrid Power Systems

IEEE Access
Harmonic state estimation is an important tool for power quality management. Current methods mostly rely on idealized real-time and synchronized harmonic data, without considering practical challenges such as non-real-time and asynchronous data, which ...
Wei Xu, Yu Sui, Yabin Chen, Huazhen Cao
doaj   +1 more source

Research on Permanent Magnet Synchronous Motor Sensorless Control System Based on Integral Backstepping Controller and Enhanced Linear Extended State Observer

Applied Sciences, 2023
The traditional sensorless control system of permanent magnet synchronous motor (PMSM) has the problems of low estimation accuracy and poor anti-interference ability. Moreover, the position estimation performance is subjected to position harmonic ripples
Lihuan Shao, Changfeng Zheng, Yan Zhang, Guanling Xie, Xiyu Hao, Xiaolong Zheng   +5 more
doaj   +1 more source

Harmonic voltage phasor reconstruction and harmonic state estimation based on the measurement data of a capacitive voltage transformer

IET Electric Power Applications
Harmonic state estimation, which highly depends on accurate synchronised phasors, is a crucial basis for the location, traceability, and governance of harmonics in power systems.
Xiaoxian Zhu, Qingjun Peng, Dexu Zou, Shan Wang, Haozhou Wang, Fangrong Zhou, Desheng Chu   +6 more
doaj   +1 more source

Optimal Harmonic Measuring Device Placement in Distribution Networks in Consideration of Topology Changes

IEEE Access, 2020
As effective measures of energy savings and emission reduction, non-linear loads, such as variable-frequency drives, are widely used. However, the problem of harmonic pollution in power systems is becoming increasingly severe.
Zhihua Zhang, Zeqi Qu, Jie Yang
doaj   +1 more source

Solid Pseudopapillary Neoplasm of the Pancreas in Children and Adolescents: Expert Recommendations

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Solid pseudopapillary neoplasm of the pancreas (SPN) is a rare low‐grade malignant exocrine pancreatic tumor, mostly discovered during the second decade of life in females, with a very good prognosis, provided microscopically complete surgical excision is achieved.
Sabine Irtan, Michael Abele, Calogero Virgone, Michaela Kuhlen, Ricardo Lopez‐Almarez, Tal Ben‐Ami, Ewa Bien, Maja Cesen, Malgorzata A. Krawczyk, Andrea Ferrari, Gianni Bisogno, Yves Reguerre, Dominik T. Schneider, Louise Galmiche, Jorg Fuchs, Sarah Braungart, Bilgehan Yalcin, Ines B. Brecht, Daniel Orbach   +18 more
wiley   +1 more source