نتایج جستجو برای: pq disturbances classification

تعداد نتایج: 540949  

Journal: :International Journal of Power and Energy Conversion 2021

In this paper, a novel method for classification of power quality events is illustrated. 15 types consisting single and multi-stage disturbances are considered study. A database the synthetic PQ generated in MATLAB using mathematical models. The signals passed through Modified Stockwell transform second order gaussian window which provides ST matrix. From matrix various statistical features suc...

Journal: :Journal of Advances in Science and Engineering 2021

Devolution of the power grid into smart was necessitated by proliferation sensitive load profiles system, as well incessant environmental challenges. These two factors culminated aggravated disturbances that cause serious havoc along entire system structure. The traditional proportional-plus-integral-plus-derivative (PID) solution offered distribution synchronous compensator (DSTATCOM) could no...

2015
Swapnil B. Mohod Vilas N. Ghate

the proliferation of power electronic devices in a modern industrial control pronounced more power quality disturbances. There is an urgent need of technique which automatically classifies and detects power quality disturbances. In this paper authors developed an online radial-basis-function NN-based detection technique. In proposed scheme simple statistical parameters described which are used ...

2013
Vladimir Dimcev Zivko Kokolanski Dimitar Taskovski

Abstrac t In the paper a virtual instrument for power quality measurement and research is proposed. The instrument is divided in several modules which provide generation, measurement and recording of the typical power quality (PQ) disturbances such as: harmonics, voltage dips, interruptions, flicker, unbalance etc. The virtual instrument allows setting different measurement parameters which exp...

2012
Chia-Hung Lin

⎯This paper proposes fractal patterns for power quality (PQ) detection using color relational analysis (CRA) based classifier. Iterated function system (IFS) uses the non-linear interpolation in the map and uses similarity maps to construct various fractal patterns of power quality disturbances, including harmonics, voltage sag, voltage swell, voltage sag involving harmonics, voltage swell invo...

Journal: :EURASIP J. Adv. Sig. Proc. 2015
Luisa Alfieri

Power quality (PQ) disturbances are becoming an important issue in smart grids (SGs) due to the significant economic consequences that they can generate on sensible loads. However, SGs include several distributed energy resources (DERs) that can be interconnected to the grid with static converters, which lead to a reduction of the PQ levels. Among DERs, wind turbines and photovoltaic systems ar...

2012
Sanjay A Deokar Laxman M Waghmare

AbstractThe dynamic voltage restorer (DVR) is a series connected device for mitigating voltage sag/This paper presents with feed forward pre-sag/swell voltage control method to regulate the output voltage of pulse width modulated (PWM) voltage source converter (VSC). The proposed controller maintains a constant load voltage under the multiple balanced/unbalanced dynamic PQ disturbances. The pro...

Journal: :EURASIP J. Adv. Sig. Proc. 2007
Kyeon Hur Surya Santoso Irene Y. H. Gu

This paper describes an efficient yet accurate methodology for estimating system damping. The proposed technique is based on linear dynamic system theory and the Hilbert damping analysis. The proposed technique requires capacitor switching waveforms only. The detected envelope of the intrinsic transient portion of the voltage waveform after capacitor bank energizing and its decay rate along wit...

Journal: :Energies 2021

Power quality (PQ) has become an important topic in today’s power system scenario. PQ issues are raised not only normal three-phase systems but also with the incorporation of different distributed generations (DGs), including renewable energy sources, storage systems, and other like diesel generators, fuel cells, etc. The prevalence these comes from non-linear features rapid changing electronic...

Journal: :Schizophrenia bulletin 2012
Helga K Ising Wim Veling Rachel L Loewy Marleen W Rietveld Judith Rietdijk Sara Dragt Rianne M C Klaassen Dorien H Nieman Lex Wunderink Don H Linszen Mark van der Gaag

In order to bring about implementation of routine screening for psychosis risk, a brief version of the Prodromal Questionnaire (PQ; Loewy et al., 2005) was developed and tested in a general help-seeking population. We assessed a consecutive patient sample of 3533 young adults who were help-seeking for nonpsychotic disorders at the secondary mental health services in The Hague with the PQ. We pe...

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