STUDY OF ELECTRO-DYNAMIC FORCES IN SHORT CIRCUIT REGIME USING MATLAB - SIMULINK SOFTWARE

2014 ◽  
Author(s):  
Titu Niculescu
Keyword(s):  
Short Circuit ◽  
Matlab Simulink ◽  
Dynamic Forces

scholarly journals Designing and Simulating Transformer Experiments under Dynamic Experiments

2021 ◽  
pp. 22-31
Author(s):  
Ramesh Kumar Patel ◽  
Madhu Upadhyay
Keyword(s):  
Short Circuit ◽  
Open Circuit ◽  
The Other ◽  
Power Transformers ◽  
Matlab Simulink ◽  
Parameter Calculation ◽  
Other Hand ◽  
Dynamic Experiments ◽  
Energy Provider

Enormous power transformers are the main gear for the power lattice. Their dependability not just influences the accessibility of power in the inventory region, yet in addition influences the monetary working of an energy provider. The primary goal of this work of the improvement of the transformer testing simulating model on the MATLAB/SIMULINK climate.The testing which depends on generator and grid of the transformer, as well as the related outcomes in SIMULINK, will be part of the conceptual stage. In addition, the technique will look into the effects of transformer validation in the method relying on grid on devices which are connected to the grids. According to the findings, neither source has an impact on the parameter calculation of Open Circuit and Short Circuit assessments. Realistic situations, on the other hand, would necessitate testing which relies on grid, which would enable a broader variety of transformers of different ratings to be evaluated with increased current capacity. The effect of a mistake on the grid can be quickly assessed by looking at the destination of the mistake, the period of the mistake, and any dips that may have took place.

scholarly journals Non-Human-Machine Interaction for Power Transmission Lines Protection Design and Enhancement of Under Voltage Relay

2022 ◽  
Vol 05 (02) ◽  
pp. 26-40
Author(s):  
Abadal-Salam T. Hussain
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Fault Location ◽  
Short Circuit ◽  
Fault Classification ◽  
Design System ◽  
Human Machine Interaction ◽  
Matlab Simulink ◽  
Operation Conditions ◽  
Voltage Drops

The continuous monitoring of transmission line protection relay is desirable to ensure the system disturbance such as fault inception is detected in transmission line. Therefore, fault on transmission line needs to be detected, classified, and located accurately to maintain the stability of system. This project presents design enhancement and development under voltage relay in power system protection using MATLAB/Simulink. The under-voltage relay is a relay that has contacts that operate when voltage drops below a set voltage which is used for protection against voltage drops to detect short circuit and others. This study is carried out for all types of faults which only related with one of the parallel lines. For the overall of operation conditions, the sample data were generated for the system by varying the different fault types and fault location. This design system proposes the use of MATLAB/ Simulink based method for fast and reliable fault classification and location for a various type of fault.

Research on the Fault-Tolerant Control Algorithm of SVPWM for NPC Three-Level Inverters

2012 ◽  
Vol 433-440 ◽  
pp. 4220-4228
Author(s):  
Wen Zhong Ma ◽  
Jin Yan Sun ◽  
Hong Mei Zhang ◽  
De Bao Tian ◽  
Hong Fei Pang
Keyword(s):  
Simulation Model ◽  
Control Algorithm ◽  
Fault Tolerant ◽  
Short Circuit ◽  
Fault Tolerant Control ◽  
Space Vector ◽  
Matlab Simulink ◽  
And Control ◽  
Short Circuit Fault ◽  
Inverter Topology

This paper mainly introduces fault-tolerant technology of three-level NPC inverters. For the three-level inverter topology and control characteristics, we use space vector (SVPWM) algorithm for modulation. when a short circuit fault in the inverter device,we use redundant space voltage vectors, and get control algorithm of redundant. Using MATLAB/Simulink software, a simulation model is analyzed, and the results demonstrate the feasibility of the method.

Microgrid Protection Based on Specific Current Injection

2013 ◽  
Vol 805-806 ◽  
pp. 1082-1086
Author(s):  
Jun Li ◽  
Zhi Fei Chen ◽  
Jun Xia Qian ◽  
Hui Gang Zhang
Keyword(s):  
Power Flow ◽  
Short Circuit ◽  
Distribution Network ◽  
Short Circuit Current ◽  
Current Injection ◽  
Harmonic Current ◽  
Matlab Simulink ◽  
Injection Method ◽  
Protection Scheme ◽  
Fault Type

Considering that microgrid (MG) can be controlled flexibly, its short circuit-current is limited and power flow is bidirectional. The paper presents a new relay protection scheme of microgrid based specific harmonic injection method. The injective harmonic flows all over microgrid and the amplitude of specific harmonic current will enhance in fault occasion. So the above characteristic can solve the problem of fault position and the symmetric characteristic can complete the identification of fault type. The discussion about the compatibility of microgrid protection and conventional distribution network line protection. At last, the combined microgrid model is built in Matlab/Simulink environment. The simulation result demonstrated that the above method can complete the identification of fault position and type and it also can coordinate with the traditional line protection well.

scholarly journals Estimation of Short Circuit Duration for the Assessment of Dynamic Effects in Distribution Substations with Flexible Conductors

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 970
Author(s):  
Piotr Piechocki ◽  
Ryszard Frackowiak ◽  
Grzegorz Dombek ◽  
Irena Chmielewska
Keyword(s):  
Simulation Model ◽  
Short Circuit ◽  
Probabilistic Method ◽  
Short Circuit Current ◽  
Dynamic Effects ◽  
The Monte Carlo Method ◽  
Dynamic Forces ◽  
Risk Criterion ◽  
Annual Frequency ◽  
Extra High Voltage

The paper focuses on finding short circuit duration for computing the dynamic effects in Extra High Voltage (EHV) distribution substations with flexible conductors with the use of probabilistic method. To find fault duration for selected substation points, a risk criterion was involved, namely the expected annual frequency of exceeding the calculated values of dynamic forces. A dedicated simulation model based on the Monte Carlo method was used to analyze the dynamic effects of short circuit current flow in the substation during faults within it and in its vicinity. The short circuit duration model is the key part of the simulation model. Due to the discussion of how the selected factors affect the estimated short circuit duration, indications helpful to find the values of the latter were formulated and some examples for the 220 kV distribution substation were given.

scholarly journals A Study of the Occurrence of Resonance under the Influence of Dynamic Forces on the Structural Elements of Electrical Installations

2021 ◽  
Vol 64 (3) ◽  
pp. 228-238
Author(s):  
Ya. V. Potachits
Keyword(s):  
Short Circuit ◽  
Dynamic Loads ◽  
Forced Oscillations ◽  
Structural Elements ◽  
Destructive Effect ◽  
Reliable Determination ◽  
Dynamic Task ◽  
Electrical Devices ◽  
Dynamic Forces ◽  
The Republic

The increase in the levels of short-circuit currents in the power system of the Republic of Belarus requires the study of the parameters of the electrodynamic stability of the main structural elements of electrical installations with flexible conductors. In case of a short circuit in the network, currents tenfold exceeding the rated one hundreds of times can flow through the current-carrying part of the device. When the magnetic fields formed by these currents interact, significant electromagnetic forces arise, which have a destructive effect both on the current-carrying parts themselves and on the structural elements of electrical installations, viz. support insulators, switching devices, measuring equipment. The movement of the wires in a short-circuit mode leads to the appearance of significant dynamic loads in them, which, in turn, are transmitted to the portals, support insulators and electrical devices. A topical problem is the occurrence of unacceptable mechanical forces in the main structural elements that can cause their destruction. Thus, the analysis of the physical and mechanical parameters and geometric dimensions of the flexible busbar of switchgear shows that a violation of the condition of electrodynamic resistance to tension is unlikely due to the high mechanical strength of the large-section steel-aluminum wires used. At the same time, span-limiting portals, support insulators and other electrical devices have significantly lower permissible bending loads. When exposed to dynamic forces, the conductors bend and transfer the load to the structural elements which have certain elasticity. Thus, a reliable determination of dynamic loads, taking into account the current-carrying parts acting on the supporting structures, is possible only if a dynamic task is set. The article describes the methods of mathematical modeling and computational experiment for analyzing the parameters of the electro-dynamic stability of the main structural elements which are determined using coefficients that depend on the natural frequencies of oscillations and the nature of changes in dynamic forces over time. To solve these problems, mathematical models are compiled and boundary value problems are formulated for calculating the electrodynamic stability of structural elements, taking into account the possible coincidence of the frequencies of natural and forced oscillations of structural elements taking into account the probable coincidence of the frequencies of forced and natural vibrations of structural elements.

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