scholarly journals PSO/GA Combined with Charge Simulation Method for the Electric Field Under Transmission Lines in 3D Calculation Model

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1140 ◽  
Author(s):  
Ru Wang ◽  
Jin Tian ◽  
Fei Wu ◽  
Zhenhua Zhang ◽  
Haishan Liu
Keyword(s):  
Electric Field ◽  
Relative Error ◽  
Field Intensity ◽  
Transmission Lines ◽  
Optimization Algorithm ◽  
Electric Field Intensity ◽  
Simulation Method ◽  
Calculation Model ◽  
Charge Simulation Method ◽  
High Voltage Engineering

The accurate calculation of electric field intensity under transmission lines is more and more important with the expansion of high voltage engineering, which largely determines the site selection and design of transmission projects. In order to get more accurate results, a methodology of a charge simulation method (CSM) combined with an intelligent optimization algorithm for a 3D calculation model is proposed in this paper. Three key points are emphasized for special mention in this optimized charge simulation method (OCSM). First, the number of sub-segments on the finite length conductor, the position and number of the simulating charge set on a sub-segment are taken as the optimization parameters for unified calculation. Secondly, the fitness function of optimization algorithm is constructed by two values, voltage relative error and electric field intensity relative error. Thirdly, a finite element method (FEM) was used to obtain the electric field intensities, which are compared with the results of the proposed algorithm. A simulation case is carried out on a 3D calculation model of 220 kV transmission lines, which verify the effectiveness of the optimization algorithm. The proposed OCSM solves the parameter optimization problem of CSM in the 3D computational model, which considers physical shape of wire span, and has the advantages of strong global search ability and higher calculation accuracy.

Calculation of Capacitance Variation in Corona Cage

2015 ◽  
Vol 740 ◽  
pp. 405-410
Author(s):  
Xiao Ming Li ◽  
Yong Zhong Pan ◽  
Hong Jun Li ◽  
Jie Shuai Ren ◽  
Po Hu ◽  
...  
Keyword(s):  
Electric Field ◽  
Transmission Lines ◽  
Simulation Method ◽  
Calculation Model ◽  
Meteorological Conditions ◽  
Charge Simulation Method ◽  
Tight Coupling ◽  
Space Charges ◽  
Supplementary Method ◽  
Capacitance Variation

Corona cage is an important supplementary method for studying corona phenomenon, which is an indispensable for designing transmission lines. In this paper, the bundle conductors are chosen as research objects and the charge simulation method (CSM) is applied to build calculation model, using line electric charges to simulate bundle conductors, walls of corona cage and space charges. The method of tight coupling of electric field and potential is first introduced in corona processing, in which the Kaptzov hypothesis is directly applied to establish equations of charge - electric field and charge - electric potential. In addition, in order to analyze the capacitance value variation of corona cage when corona onset occurs, the emission, migration and composite process of space charges is simulated. Finally, 4, 8, 12 conductors in corona cage under different meteorological conditions are modeled, and the research results are analyzed. This research can also be applied to model corona cage and high voltage transmission lines at different voltage levels and different bundles under different meteorological conditions.

Study on Distribution Model of Electric Field for 220 kV Transmission Lines and Implement

2013 ◽  
Vol 860-863 ◽  
pp. 2315-2319
Author(s):  
Guang Zhou Zhang ◽  
Mu Li ◽  
Gong Da Zhang ◽  
Hu Zhang ◽  
Shu Bo Fang
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Transmission Line ◽  
Electric Field Strength ◽  
Transmission Lines ◽  
Simulation Method ◽  
Distribution Model ◽  
Charge Simulation Method ◽  
Power Frequency ◽  
Made In

For studying the environment of power frequency electric field near the transmission line, the electric field model of 220kV transmission line was made in charge simulation method. Using the model, the electric field strength nearby the ground that under the lines was calculated and the distribute curves were drew in MATLAB language. The results showed that increasing the height of the conductors to ground, the electric field strength at the same point becomes lower.

The Electromagnetic Environmental Impact of High-Voltage Transmission Line and its Prevention Methods

2013 ◽  
Vol 726-731 ◽  
pp. 4013-4016
Author(s):  
Jian Zhao Qi ◽  
Jun Guo
Keyword(s):  
Electric Field ◽  
Transmission Line ◽  
Field Intensity ◽  
Transmission Lines ◽  
Electric Field Intensity ◽  
Parameters Optimization ◽  
Electromagnetic Environment ◽  
Minimal Impact ◽  
Phase Sequence ◽  
Frequency Electric Field

This paper calculates frequency electric field intensity by the equivalent charge method, and analyzes the main factors affecting the electromagnetic environment of the 500kV Double Circuit Transmission Lines. In the same electromagnetic transmission line calculation parameters, optimization of phase sequence can effectively reduce the frequency electric field intensity; with the increase of the distance, the line frequency electric field intensity significantly reduces away from the center line within 25m. Finally, the paper obtains the phase sequence arrangement with minimal impact on the electromagnetic environment and the minimum ground clearance meeting the environmental requirements.

Electric Field Computation with Improved Charge Simulation Method Considering Volume and Surface Resistivities

2011 ◽  
Vol 131 (8) ◽  
pp. 717-718 ◽  
Author(s):  
Hiroyuki Iwabuchi ◽  
Taiki Donen ◽  
Akiko Kumada ◽  
Kunihiko Hidaka
Keyword(s):  
Electric Field ◽  
Simulation Method ◽  
Charge Simulation Method ◽  
Field Computation

High-speed isotachophoresis. Analytical aspects of the steady-state longitudinal temperature profiles

1979 ◽  
Vol 44 (3) ◽  
pp. 841-853 ◽  
Author(s):  
Zbyněk Ryšlavý ◽  
Petr Boček ◽  
Miroslav Deml ◽  
Jaroslav Janák
Keyword(s):  
Steady State ◽  
Temperature Distribution ◽  
Electric Field ◽  
Field Intensity ◽  
Electric Field Intensity ◽  
Minor Component ◽  
Physical Models ◽  
Temperature Profiles ◽  
Longitudinal Temperature ◽  
Continuous Character

The problem of the longitudinal temperature distribution was solved and the bearing of the temperature profiles on the qualitative characteristics of the zones and on the interpretation of the record of the separation obtained from a universal detector was considered. Two approximative physical models were applied to the solution: in the first model, the temperature dependences of the mobilities are taken into account, the continuous character of the electric field intensity at the boundary being neglected; in the other model, the continuous character of the electric field intensity is allowed for. From a comparison of the two models it follows that in practice, the variations of the mobilities with the temperature are the principal factor affecting the shape of the temperature profiles, the assumption of a discontinuous jump of the electric field intensity at the boundary being a good approximation to the reality. It was deduced theoretically and verified experimentally that the longitudinal profiles can appreciably affect the longitudinal variation of the effective mobilities in the zone, with an infavourable influence upon the qualitative interpretation of the record. Pronounced effects can appear during the analyses of the minor components, where in the corresponding short zone a temperature distribution occurs due to the influence of the temperatures of the neighbouring zones such that the temperature in the zone of interest in fact does not attain a constant value in axial direction. The minor component does not possess the steady-state mobility throughout the zone, which makes the identification of the zone rather difficult.

POLARON IN A QUANTUM DOT UNDER AN ELECTRIC FIELD

2007 ◽  
Vol 21 (24) ◽  
pp. 1635-1642
Author(s):  
MIAN LIU ◽  
WENDONG MA ◽  
ZIJUN LI
Keyword(s):  
Quantum Dot ◽  
Electric Field ◽  
Field Intensity ◽  
Ground State Energy ◽  
Ground State ◽  
Electric Field Intensity ◽  
State Energy ◽  
Theoretical Study ◽  
The Moment ◽  
Transformation Methods

We conducted a theoretical study on the properties of a polaron with electron-LO phonon strong-coupling in a cylindrical quantum dot under an electric field using linear combination operator and unitary transformation methods. The changing relations between the ground state energy of the polaron in the quantum dot and the electric field intensity, restricted intensity, and cylindrical height were derived. The numerical results show that the polar of the quantum dot is enlarged with increasing restricted intensity and decreasing cylindrical height, and with cylindrical height at 0 ~ 5 nm , the polar of the quantum dot is strongest. The ground state energy decreases with increasing electric field intensity, and at the moment of just adding electric field, quantum polarization is strongest.

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