Application of travelling-wave methods to the calculation of transient-fault currents and voltages in power-system networks

1980 ◽  
Vol 127 (3) ◽  
pp. 153 ◽  
Author(s):  
J.P. Bickford ◽  
M.H. Abdel-Rahman
Keyword(s):  
Power System ◽  
Travelling Wave ◽  
Transient Fault ◽  
Fault Currents ◽  
Wave Methods

Reliable Analysis on Fast Valving of Ultra-Supercritical Unit Under Transient Fault Conditions

2017 ◽  
Author(s):  
Yu Cai ◽  
Wei Li ◽  
Bao Zhang ◽  
Wenjian Wu ◽  
Deren Sheng ◽  
...  
Keyword(s):  
Power System ◽  
Steam Turbine ◽  
Dynamic Model ◽  
Transient Stability ◽  
Power Grid ◽  
Load Shedding ◽  
Control Mode ◽  
Normal Operation ◽  
Transient Fault ◽  
The Stability

Fast valving of ultra-supercritical unit has great effects on over-speed prevention, load-shedding control, transient stability analysis of electrical system and other security problems. The purpose of fast valving is to maintain the stability of power system once fault or load shedding of unit occurs in the electric power system. Therefore, it is of great significance to study the reliability of fast valving for ultra-supercritical unit. In this paper, the KU ( short shedding) logic condition of SIEMENS T3000 system is analyzed as the research object of fast valving. The unit can be avoided over speed by monitoring the unit load and fast valving under faulty grid conditions based on the KU control. A series of measures will be taken after KU is triggered, for instance the governing valving will be closed quickly and the DEH (digital electro-hydraulic) control of the steam turbine will be switched to speeding control mode. On the other hand, the unit will return to normal operation if the transient fault of power grid disappears. The key contributions of this thesis include three parts: Firstly, based on the analysis of control characteristics of ultra-supercritical unit and protective logic and triggered conditions of KU function, a novel dynamic model by coupling the fast valving of steam turbine and the transient stability of generator is established by applying the PSCAD software. Then, the dynamic response process of ultra-supercritical unit is simulated and calculated by adopting the coupling dynamic model when KU function is triggered. Also the influence factors and reliability of fast valving are analyzed under transient fault conditions. Finally, two optimized measures by increasing the time delay and the speed of quantitative judgment are put forward to reduce risks and avoid the misoperation of signal distortion which may be caused by the power transmitter under transient fault conditions. The results of this study can not only help to evaluate the reliability of fast valving function scientifically in power grid transient fault, but also guide the technicians to analyze the stability of the power grid.

A low-power system design for Lamb wave methods

2010 ◽  
Author(s):  
Shaver Deyerle ◽  
Dong Sam Ha ◽  
Daniel J. Inman
Keyword(s):  
Power System ◽  
Low Power ◽  
System Design ◽  
Lamb Wave ◽  
Low Power System ◽  
Wave Methods

Simulation of the impact of wind power on the transient fault behavior of the Nordic power system

2007 ◽  
Vol 77 (2) ◽  
pp. 135-144 ◽  
Author(s):  
Clemens Jauch ◽  
Poul Sørensen ◽  
Ian Norheim ◽  
Carsten Rasmussen
Keyword(s):  
Power System ◽  
Wind Power ◽  
Transient Fault ◽  
Fault Behavior ◽  
The Impact

scholarly journals HVDC TRANSMISSION LINE PROTECTION BASED ON TRANSIENT ENERGY AND TRANSIENT POWER: A SURVEY

2020 ◽  
Vol 5 (3) ◽  
pp. 21-32
Author(s):  
Henok Teklu ◽  
Amit Panchal
Keyword(s):  
Power System ◽  
Review Paper ◽  
Power Transmission ◽  
Travelling Wave ◽  
Transmission System ◽  
Long Distance ◽  
Severe Problem ◽  
Hvdc Transmission ◽  
Transient Energy ◽  
Power And Energy

As the number of consumers of electricity increases the electric power generated required to serve the consumers increases. Due to the long distance transmission of the generated power the power system becomes complex. That is why HVDC transmission system used for long distance carriage of power. During transmission of HVDC system protection and security of the system is compulsory in order to minimize the overall losses. This review paper discusses the protection of HVDC line based on transient energy and transient power. The fault which is occurred on the system reflected on three main parts of the system. Using modified traveling wave algorithm the transient parameters are determined and the type and location of fault can be detected. The simulation is done using PSCAD/EMTDC, MATLAB/Simulink. Motivation/Background: Due to the complication of a power system, HVDC power transmission system was chosen. But the system needs protection to secure the transportation of the needed amount of power. Method: In this review paper a modified travelling wave algorithm is used to detect the faults. Results: The result from the output of the algorithm shows the transient power and energy came to stability within short time. Conclusions: By detecting the transient power and energy, it can easily be protect the system from severe problem.

scholarly journals FDTD analysis of transient fault induced travelling-wave propagation for multi-branch distribution networks

2020 ◽  
Vol 33 ◽  
pp. 124-129
Author(s):  
Baiyang Liu ◽  
Minqiang Li ◽  
Chen Wang ◽  
Kun Yu ◽  
Yongze Wu ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Distribution Networks ◽  
Travelling Wave ◽  
Transient Fault ◽  
Branch Distribution

New Methodology of Fault Identifier for the Double Circuit Line on the same Tower

2014 ◽  
Vol 521 ◽  
pp. 330-333
Author(s):  
Yu Sheng Quan ◽  
En Ze Zhou ◽  
Hua Gui Chen ◽  
Xin Zhao
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Transmission Lines ◽  
Social Economy ◽  
Criterion Function ◽  
Transient Fault ◽  
Permanent Fault ◽  
Overhead Transmission Line ◽  
Practical Engineering ◽  
The Stability

High voltage overhead transmission line is an important part of the power system to ensure the safe operation of the entire power system, which is of great significance. Power line fault not only has adverse effects to the social economy, and it may also affect the stability of the power system. Transmission line faults including permanent fault and transient fault are identified quickly and accurately, which has important practical engineering significance. This paper presents a method which can be used to identify the permanent fault and transient fault of double-circuit transmission line on the same tower, fault transient voltages and currents extracted from both ends of transmission lines are as a signal source which is decomposed into a series of harmonics in order to establish a criterion function, and then the transient and permanent fault can be identified based on the changes of criterion function value.

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