scholarly journals Transmission line short circuit analysis by impedance matrix method

2020 ◽  
Vol 10 (2) ◽  
pp. 1712
Author(s):  
Boniface Onyemaechi Anyaka ◽  
Innocent Onyebuchi Ozioko
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Matrix Method ◽  
Electrical Power ◽  
Fault Analysis ◽  
Single Line ◽  
Impedance Matrix ◽  
Electrical Power System ◽  
Ground Fault ◽  
Fault Currents

Fault analysis is the process of determining the magnitude of fault voltage and current during the occurrence of different types of fault in electrical power system. Transmission line fault analysis is usually done for both symmetrical and unsymmetrical faults. Symmetrical faults are called three-phase balance fault while unsymmetrical faults include: single line-to-ground, line-to-line, and double line-to-ground faults. In this research, bus impedance matrix method for fault analysis is presented. Bus impedance matrix approach has several advantages over Thevenin’s equivalent method and other conventional approaches. This is because the off-diagonal elements represent the transfer impedance of the power system network and helps in calculating the branch fault currents during a fault. Analytical and simulation approaches on a single line-to-ground fault on 3-bus power system network under bolted fault condition were used for the study. Both methods were compared and result showed negligible deviation of 0.02% on the average. The fault currents under bolted condition for the single line-to-ground fault were found to be 4. 7244p.u while the bus voltage is 0. 4095p.u for buses 1 and 2 respectively and 0. 00p.u for bus 3 since the fault occurred at this bus. Therefore, there is no need of burdensomely connecting the entire three sequence network during fault analysis in electrical power system.

scholarly journals Three-Phase Fault Analysis on Transmission Line in Matlab Simulink

2021 ◽  
Vol 9 (VI) ◽  
pp. 5386-5391
Author(s):  
Harshal Vilas Patil
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Short Circuit ◽  
Electrical Equipment ◽  
Fault Analysis ◽  
Single Line ◽  
Double Line ◽  
Ground Fault ◽  
Proposed Model ◽  
Three Phase

Now-a-days the demand of electricity or power areincreases day by day this results to transmits more power byIncreasing the transmission line capacity from one place to theother place. But during the transmission some faults areoccurred in the system, such as L-L fault (line to line), 1L-Gfault (single line to ground) and 2L-G fault (double line toground). These faults affect the power system equipmentswhich are connected to it. The main aim of this paper is tostudy or analysis of faults and also identifies the effect of thefault in transmission line along with bus system which isconnected to transmission line. Mainly the major faults in longtransmission lines is (L-G) single line to ground fault which areharmful to the electrical equipment. A proposed model intransmission line is simulated in MATLAB software to analysisand identified the faults. Fault block was taken from the sim-power system block library. The whole modeling andsimulation of different operating and different conditions offault on transmission line, their faults are L-G fault, 2L-Gfault, 3L-G fault and three line short circuit of the proposedwork is presented in this paper.

scholarly journals Optimal Placement of FACTS Devices Based on Whale Optimization Algorithm for Power System Security Enhancement

2020 ◽  
Vol 9 (3) ◽  
pp. 908-916
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Optimization Algorithm ◽  
Power Flow ◽  
Electrical Power ◽  
Optimal Location ◽  
Electrical Power System ◽  
Facts Devices ◽  
Whale Optimization ◽  
Line Overload

The present-day power system is vulnerable to instability and security threats due to the continuously changing load pattern. To enhance the security of the power system and to avoid the electrical power system from collapsing, the condition of the system security has to be inspected by security analysis tools and it can be enhanced by the proper integration of FACTS devices into the network. This paper presents a methodology in which the security of the system can be analyzed with the help of an index called Line Overload Severity Index (LOSI). Unified Power Flow Controller (UPFC) is preferred to improve the security of the power system. Owing to the cost involved in placing UPFCs it is obligatory to use minimum number of devices, by optimally placing them in the network. It is obligatory to recognize an ideal location to install UPFC. Considering the Line overload Sensitivity Index, the optimal location identification for UPFC is done. The paper also presents the formulation of a new severity function using transmission line loadings. The severity function combines the objectives of reducing transmission line loadings and improvement of voltage profile during multi line contingencies. In the event of multi-line contingencies, the objective function for reducing the fuel cost and the severity function are analyzed. Optimal power flow method is followed to analyze the security of the electrical power system during contingency situations. This optimal location identification procedure and the OPF are solved using a metaheuristic technique, Whale Optimization Algorithm (WOA). The whole methodology that is proposed is experimented on a standard IEEE-30 bus test system.

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