scholarly journals Phasor Estimation of Transient Electrical Signals Composed of Harmonics and Interharmonics

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5166
Author(s):  
Jon Vazquez ◽  
Jose Felix Miñambres ◽  
Miguel Angel Zorrozua ◽  
Jorge Lázaro
Keyword(s):  
Power Systems ◽  
Digital Filter ◽  
Digital Filters ◽  
Fault Location ◽  
Electrical Power ◽  
Poor Response ◽  
Electrical Network ◽  
Effective Response ◽  
Transient Signals ◽  
Phasor Estimation

Numerical relays have become essential tools for carrying out the protection and surveillance tasks of electrical power systems. These relays implement their functions from the phasors of the electrical network signals, estimated by digital processing using digital filters. Digital filters must meet certain requirements, such as providing a fast and effective response to increasingly complex transient signals made up of components that make the estimation process difficult. In addition to the decreasing exponential (decaying dc offset), harmonics, and signal noise, it must be added that the interharmonic components that in recent years have acquired great relevance, mainly because of the increase in non-linear loads and the extensive use of power electronic systems. The presence of these interharmonic components causes a poor response in most of the filters implemented today. This article presents the design of a new digital filter, C-CharmDF (Cleaned Characteristic Harmonic Digital Filter) for phasor estimation on noisy transient signals with decreasing exponential components, harmonics, and interharmonics. A detailed study was carried out for severe transient situations and stationary signals. It was found that the method can be suitable for relays that implement both fault location functions and system protection functions.

Direct Fault Location in Electrical Power Systems

1982 ◽  
Vol PAS-101 (10) ◽  
pp. 4049-4054 ◽  
Author(s):  
L. Roytman ◽  
B. Thomas ◽  
F. Trutt ◽  
M. S. Swamy
Keyword(s):  
Power Systems ◽  
Fault Location ◽  
Electrical Power ◽  
Electrical Power Systems

Direct Fault Location in Electrical Power Systems

1982 ◽  
Vol PER-2 (10) ◽  
pp. 56-57
Author(s):  
L. M. Roytman ◽  
B. J. Thomas ◽  
F. C. Trutt ◽  
M. N. S. Swamy
Keyword(s):  
Power Systems ◽  
Fault Location ◽  
Electrical Power ◽  
Electrical Power Systems

Fault location in electrical power systems using intelligent systems techniques

2001 ◽  
Vol 16 (1) ◽  
pp. 59-67 ◽  
Author(s):  
J.C.S. Souza ◽  
M.A.P. Rodrigues ◽  
M.T. Schilling ◽  
M.B. Do Coutto Filho
Keyword(s):  
Power Systems ◽  
Intelligent Systems ◽  
Fault Location ◽  
Electrical Power ◽  
Electrical Power Systems

A Gabor Filter Based Approach for Locating Faults in Distribution

2011 ◽  
Vol 403-408 ◽  
pp. 5007-5014
Author(s):  
Pratul Arvind ◽  
Rudra Prakash Maheshwari
Keyword(s):  
Power Systems ◽  
Power Distribution ◽  
Distribution System ◽  
Fault Location ◽  
Gabor Filter ◽  
Electrical Power ◽  
Electrical Power System ◽  
Power Distribution System ◽  
Electric Power Distribution ◽  
Node Distribution

Electric Power Distribution System is a complex network of electrical power system. Also, large number of lines on a distribution system experiences regular faults which lead to high value of current. Speedy and precise fault location plays a pivotal role in accelerating system restoration which is a need of modern day. Unlike transmission system which involves a simple connection, distribution system has a very complicated structure thereby making it a herculean task to design the network for computational analysis. In this paper, the authors have simulated IEEE 13- node distribution system using PSCAD which is an unbalanced system and current samples are generated at the substation end. Considering the application of signal processing tools to power systems a talk of modern day research, Gabor decomposition of the current samples are also presented which is utilised for locating all ten types of faults. It is kept in mind that Gabor transform has not been applied to current samples of distribution system as per the literature available till date.

scholarly journals Calculation of RMS Values for Variable Frequency Sinusoidal Signals, Using Phasors and Digital SAL and CAL Filters

2021 ◽  
Author(s):  
Yonatan Aguirre ◽  
Flabio Gutierrez ◽  
Richard Abramonte ◽  
Nilthon Arce ◽  
Antenor Aliaga
Keyword(s):  
Power Systems ◽  
Power Distribution ◽  
Distribution Systems ◽  
Digital Filters ◽  
Electrical Power ◽  
General Purpose ◽  
Variable Frequency ◽  
Power Distribution Systems ◽  
Computational Requirement ◽  
Sinusoidal Signals

The accurate measurement of RMS values of voltage and current is crucial for the monitoring and protection of power systems and in general for electrical power distribution systems. The authors in this paper have developed an algorithm to calculate the RMS value of sinusoidal signals of varying frequency, by applying phasors obtained from digital filters SAL and CAL. In conditions in which the frequency of the grid varies, a phase shift is presented in the phasor of the grid voltage which is used for the design of a regulator that allows to obtain accurate RMS voltage values. The choice of the SAL and CAL digital filters is due to their low computational requirement, so they can be implemented in general-purpose microcontrollers.

scholarly journals Analysis of the influence of non-sinusoidal and unbalanced network modes on induction motors

2021 ◽  
Vol 289 ◽  
pp. 01002
Author(s):  
Ngo Van Cuong ◽  
Lidiia I. Kovernikova
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Induction Motors ◽  
Electrical Power ◽  
Electrical Energy ◽  
Operating Conditions ◽  
Premature Aging ◽  
Electrical Network ◽  
Electrical Networks ◽  
Electrical Power Systems

The parameters of electrical network modes do not correspond the requirements GOST 32144-2013 of Russian and the National technical regulation of Vietnam. In real operating conditions in electrical networks in non-sinusoidal and unbalanced modes there are harmonic components of voltages and currents as well as voltages and currents of negative sequence. They cause additional losses of active power, which leads to additional heating and causes premature aging of the insulation, and as the result, the reduction in the service life of induction motors. Currently, we see that the process of formation of intelligent electrical power systems is underway. Systems for continuous monitoring of power quality indices and parameters of electrical systems modes are being developed. These systems can be supplemented with programs for calculating characteristics that issue the warning when the unfavorable influence of the parameters of non-sinusoidal and unbalanced modes is detected on various electrical equipment of both electrical power systems and consumers of electrical energy. The paper provides an overview of the characteristics used to analyze, assess and predict the influence of poor power quality associated with non-sinusoidal and unbalanced of currents and voltages on induction motors. A computer program was developed to calculate these characteristics. The program was used to study the influence of non-sinusoidal and unbalanced modes on the induction motors of the coal sorting plant of the Vietnamese company “Cua Ong-Vinacomin”.

Analysis Of Digital Filters Response By Fasorial Estimation For Protection Of Electrical Power Systems

2019 ◽  
Author(s):  
Artur Henrique Rodrigues ◽  
Eduardo Machado dos Santos ◽  
Jacqueline Chuma Batistella ◽  
Arian Rodrigues Fagundes ◽  
Paulo Ricardo Fiuza Marques ◽  
...  
Keyword(s):  
Power Systems ◽  
Digital Filters ◽  
Electrical Power ◽  
Electrical Power Systems
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