Protection Coordination and Anti Islanding Protection Solution for Biomass Power Plant Connected on Distribution Network

2016 ◽  
Vol 6 (6) ◽  
pp. 2526
Author(s):  
Srete N Nikolovski ◽  
Marko Vukobratović ◽  
Ljubomir Majdandzic
Keyword(s):  
Power Plant ◽  
Time Domain ◽  
Distribution Network ◽  
Software Tool ◽  
Two Phase ◽  
Three Phase ◽  
Short Circuits ◽  
Distribution Generation ◽  
The Time Domain ◽  
Biomass Power Plant

<p>Protection coordination as well as anti-island protection play significant role in the process of biomass power plant connection on the distribution network. Distribution generation island operation in Croatia is unacceptable according to the existing National grid code Paper presents a protection coordination of all passive protections used in the real biomass power plant and connected distriubution network feeder. Short-circuits three phase, two phase and single line to ground faults and generator islanding simulations have been performed and simulated in the time domain at the different network  locations using DIgSILENT Power Factory software. The time-current plots coordination of protective devices are made using Smart PDC module in Easy Power Protector software tool.</p>

scholarly journals Protection Coordination and Anti Islanding Protection Solution for Biomass Power Plant Connected on Distribution Network

2016 ◽  
Vol 6 (6) ◽  
pp. 2526
Author(s):  
Srete N Nikolovski ◽  
Marko Vukobratović ◽  
Ljubomir Majdandzic
Keyword(s):  
Power Plant ◽  
Time Domain ◽  
Distribution Network ◽  
Software Tool ◽  
Two Phase ◽  
Three Phase ◽  
Short Circuits ◽  
Distribution Generation ◽  
The Time Domain ◽  
Biomass Power Plant

<p>Protection coordination as well as anti-island protection play significant role in the process of biomass power plant connection on the distribution network. Distribution generation island operation in Croatia is unacceptable according to the existing National grid code Paper presents a protection coordination of all passive protections used in the real biomass power plant and connected distriubution network feeder. Short-circuits three phase, two phase and single line to ground faults and generator islanding simulations have been performed and simulated in the time domain at the different network  locations using DIgSILENT Power Factory software. The time-current plots coordination of protective devices are made using Smart PDC module in Easy Power Protector software tool.</p>

Three Phase Induction Motor Inverter Defects Diagnosis Using Voltage Spectrum of an Auxiliary Winding

2014 ◽  
Vol 672-674 ◽  
pp. 1244-1252
Author(s):  
Lamiaâ El Menzhi ◽  
Abdallah Saad
Keyword(s):  
Fourier Transform ◽  
Induction Motor ◽  
Time Domain ◽  
Phase Voltage ◽  
Voltage Inverter ◽  
Three Phase ◽  
Voltage Signal ◽  
Simulation Results ◽  
A New Technique ◽  
The Time Domain

In this paper, a new technique for diagnosing faults in three phase voltage inverter feeding induction motor is presented. It is based on the so-called the voltage spectrum of an auxiliary winding. For this purpose, expression of the inserted winding voltage is presented. After that, discrete Fourier transform analyzer is required for converting the voltage signal from the time domain to the frequency domain. Simulation results curried out for non defected and defected inverter show the effectiveness of the proposed method.

scholarly journals Minimizing the Computational Effort to Optimize Solar Concentrators with the Open-Source Tools SunPATH and Tonatiuh++

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4412
Author(s):  
Manuel J. Blanco ◽  
Victor Grigoriev ◽  
Kypros Milidonis ◽  
George Tsouloupas ◽  
Miguel Larrañeta ◽  
...  
Keyword(s):  
Open Source ◽  
Time Domain ◽  
High Performance ◽  
Software Tool ◽  
Spatial Domain ◽  
Computational Effort ◽  
Test Case ◽  
Optical Efficiency ◽  
The Time Domain

Integrals that are of interest in the analysis, design, and optimization of concentrating solar thermal systems (CST), such as the annual optical efficiency of the light collection and concentration (LCC) subsystem, can be accurately computed or estimated in two distinct ways: on the time domain and on the spatial domain. This article explores these two ways, using a case study that is highly representative of the commercial CST systems being deployed worldwide. In the time domain, the computation of these integrals are explored using 1-min, 10-min, and 1-h solar DNI input data and using The Cyprus Institute (CyI)’s High-Performance Computing (HPC) system and an open-source ray tracer, Tonatiuh++, being actively developed at CyI. In the spatial domain, the computation of these integrals is explored using SunPATH, another open-source software tool being actively developed at CyI, in tandem with Tonatiuh++. The comparison between the time and spatial domain approach clearly indicate that the spatial domain approach using SunPATH is dramatically more computationally efficient than the time domain approach. According to the results obtained, at least for the case study analyzed in this article, to compute the annual energy delivered by the LCC subsystem with a relative error less than 0.1%, it is enough to provide SunPATH with 1-h DNI data as input, request from SunPATH the sun position and weights of just 30 points in the celestial sphere, and run Tonatiuh++ to simulate these 30 points using 15 million rays per run. As the test case is highly representative, it is expected that this approach will yield similar results for most CST systems of interest.

scholarly journals Method for the Analysis of Three-Phase Networks Containing Nonlinear Circuit Elements in View of an Efficient Power Flow Computation

Electronics ◽  
2021 ◽  
Vol 10 (21) ◽  
pp. 2710
Author(s):  
Claudiu Tufan ◽  
Iosif Vasile Nemoianu
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Power Flow ◽  
Power Balance ◽  
Nonlinear Circuit ◽  
Flow Computation ◽  
Three Phase ◽  
The Time Domain ◽  
Efficient Power ◽  
Corrected Function

The present paper is devoted to applying the Hănțilă method for solving nonlinear three-phase circuits characterized by different reactance values on the three sequences (positive, negative and zero). Nonlinear elements, which are components of the circuit, are substituted by real voltage or current sources, whose values are an iteratively corrected function of the voltage across or the current through them, respectively. The analysis is carried out in the frequency domain and facilitates an easy evaluation of the power transfer on each harmonic. The paper presents numerical implementations of the method for two case studies. For validation, the results are compared against those obtained using the software LTspice in the time domain. Finally, the power flow on the harmonics and the overall power balance are analyzed.

scholarly journals ELAN Analysis Companion (EAC): A Software Tool for Time-course Analysis of ELAN-annotated Data

2016 ◽  
Vol 9 (3) ◽  
Author(s):  
Richard Andersson ◽  
Olof Sandgren
Keyword(s):  
Time Domain ◽  
Time Course ◽  
Data Extraction ◽  
Software Tool ◽  
Analysis Data ◽  
Visual World ◽  
Visual World Paradigm ◽  
Free Data ◽  
The Time Domain ◽  
Over Time

LAN is a widely used and free (in both senses) annotation software for behavioral or other events that unfold over time. We report on and release a stand-alone program that expands on ELAN's capabilities in two ways: 1) it allows the researcher to plot and export time-course analysis data directly from ELAN's native annotation files, allowing for hassle-free data extraction in the time domain, e.g. for visual-world paradigm studies; and 2) it allows the researcher to weight ELAN's built-in annotator reliability rating based on the duration of the coded events. This software is released under an open license.

scholarly journals DETERMINING A TYPE OF A DAMAGE IN THE CURRENT PROTECTION OF POWER LINES OF 6–35 KV

2017 ◽  
Vol 60 (6) ◽  
pp. 497-504 ◽  
Author(s):  
F. A. Romaniuk ◽  
E. V. Buloichik ◽  
O. A. Huryanchyk ◽  
M. A. Shevaldin
Keyword(s):  
Dynamic Properties ◽  
Short Circuit ◽  
Distribution Networks ◽  
Two Phase ◽  
Worst Case ◽  
Reliable Determination ◽  
Three Phase ◽  
Short Circuits ◽  
Current Unbalance

The methods to identify types of phase-to-phase short circuits that can be used to improve technical excellence by speed-current line protection of distribution networks of 6–35 kV are considered. As a result of the assessment of the appropriateness of their application in current protection, the choice was made in favor of the method based on the control of the relative current unbalance. The influence of contact resistances and load currents of various levels on the magnitude and character of the change of relative unbalance taking into account the errors of measuring transformers of current has been studied with the aid of the method of numerical experiment. It is demonstrated that in a lot of cases of arch short circuits in the loaded power line and in idle mode, the control only asymmetry is insufficient for reliable determination of the type of damage. A better algorithm has been proposed for determining phase-to-phase short circuit based on the control and the analysis of the two relative unbalance currents determined by the current values of the differences of the phase currents of the line. Its serviceability was evaluated. It was found out that in all the modes being considered, the proposed method – when boundary conditions are properly chosen – makes it possible to fix three-phase and two-phase short circuit on the protected line, and in the area of remote redundancy. The dynamic properties of the proposed method are investigated for different modes of the line. It is established that in the worst case, the determining of the damage is provided during the time not exceeding 25 ms.

Some aspects of the calculation of short circuits in mine distribution networks. The calculation of the effective values of the short-circuit currents is carried out in order to determine the minimum

2020 ◽  
Vol 14 (1) ◽  
pp. 66-69
Author(s):  
V. KALINICHENKO ◽  
◽  
I. PRIDATKO ◽  
Keyword(s):  
Short Circuit ◽  
Distribution Networks ◽  
Two Phase ◽  
Cable Network ◽  
Transformer Substation ◽  
Three Phase ◽  
Short Circuits ◽  
Artificial Introduction ◽  
Short Circuit Currents ◽  
Circuit Power

The calculation of the effective values of the short-circuit currents is carried out in order to determine the minimum value of the current of the two- phase short-circuit required to select the settings of the means of protection, as well as the maximum value of the current of the three-phase short-circuit required to test the switching equipment for the ability to switch off. In most studies, the calculation of short-circuit currents is carried out only taking into account the total resistance of the transformer substation and the cable network. They also take into account the maximum short-circuit power (100MVA) due to the use of high-voltage explosion-proof switchgear type KRUV-6 without taking into account the influence of the external network. An external network, in turn, may limit the short-circuit power below 100MVA. The calculation of the short-circuit power of the external system with regard to the network parameters was considered. The actual magnitude of this capacity differs from that accepted in the known calculations and is below these values due to the natural or artificial introduction of reactor reactance and causes an error of 10-40%. Remote short-circuits of the distribution network reduce the short-circuit power of the input terminals of the step-down transformers, and therefore the influence of the external network on the short-circuit currents in the district networks increases. This approach will allow the determination of short-circuit currents in the mine distribution networks with higher accuracy. This will reduce the risk of accidents in an explosive mining environment.

scholarly journals Comparative Study of Integer and Non-Integer Order Models of Synchronous Generator

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4416
Author(s):  
Szymon Racewicz ◽  
Filip Kutt ◽  
Michał Michna ◽  
Łukasz Sienkiewicz
Keyword(s):  
Time Domain ◽  
Direct Method ◽  
Short Circuit ◽  
Synchronous Generator ◽  
Equation System ◽  
Integer Order ◽  
Salient Pole ◽  
Three Phase ◽  
The Time Domain ◽  
Voltage Recovery

This article presents a comparison between integer and non-integer order modelling of a synchronous generator, in the frequency domain as well as in the time domain. The classical integer order model was compared to one containing half-order systems. The half-order systems are represented in a Park d-q axis equivalent circuit as impedances modelled by half-order transmittances. Using a direct method based on the approximation of the half-order derivatives by the Grünwald–Letnikov definition, a state-space equation system was solved. For both models, a computational program written in Matlab® software was used. For the purpose of time domain simulation, the machine models were connected to an electric load composed of an RL circuit. To validate and compare both models, simulation results of a three-phase short-circuit and a no-load voltage recovery were compared with corresponding measurements performed on a solid salient-pole synchronous generator of 125 kVA.

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