This paper presents an application of the Radial Basis Function – Based Finite Difference Time Domain Method (RBF-FDTD) such as MQ (Multiquadrics), IMQ (Inverse Multiquadrics) and GA (Gaussian) is developed in [1] for modeling the lightning-induced voltages on overhead power lines in both cases of ideal ground and lossy ground. In addition, the influence of corona on the lightning-induced voltages has been considered as well. In order to increasing the accuracy of proposed method, the optimal algorithm of finding the shape parameter has been used. The accuracy, effectiveness and applicability of The MQ, IMQ and GA RBF-FDTD are evaluated through computing the lightning-induced voltages on 110kV overhead distribution lines. The solutions obtained by the RBF-FDTD are compared with those of the traditional FDTD based on the basic solution of the LIOV. The obtained results demonstrate that the RBF-FDTD is always more accurate than the traditional FDTD, in particular with the optimal shape parameter.
This paper presents the application of the Finite Element methods to calculating and modeling the lightning transient responses on grounding grid. The uniform and optimized grids are used in this work. The tested results obtained on many different models of the conductor and grids have seen the effectiveness of the proposed method and the influence of conductor compression to the transient values when the lightning current into the grid at the different positions.
The HVDC transmission lines have been building in many modern countries in all over the world, and it will be an important problem of Viet Nam power transmission. The important phenomena of operation of HVDC transmission lines is corona discharge around HVDC transmission lines that is a cause to increase significantly the electric field strength over ground surface and around lines. This paper presents the investigation and calculation of the electric field strength of many models of HVDC transmission lines such as monopolar, bipolar, single- and double-circuit using the finite element method based on COMSOL MULTIPHYSICS software. The calculation results have shown the strength and shape of the electric field strength at many positions over ground level. These results are also good datum to calculate and design HVDC transmission lines of Viet Nam power transmission in the near future.
Fault location identification of highvoltage transmission line, especially threeterminal lines, is an important issue in power system operation. In this paper, we investigate the application of wavelet transform to locate the fault position of teed circuits high-voltage transmission line. The components of the transient wave at terminals of the faulted line are simulated by MATLAB Simulink. These components will be decomposed into wavelet coefficients by using discrete wavelet transformation. The proposed approach has the advantages that gives the exact time of transient wave for traveling from fault position to the terminals of the lines. To evaluate the applicability and effectiveness of this new approach, we have applied the proposed method to a threeterminal transmission line in reference [9] and the actual transmission line 110kV O Mon – Sa Dec – Binh Minh.
This paper presents an application of the Radial Basis Function – Based Finite Difference Method (RBF-FD) to solving the electrical transient problems defined by the time-dependent ordinary differential equations. In this method, the finite difference approximations of first- and second-order derivatives in time domain are formalated the same as those in space domain based on the MQ (Multiquadrics) function presented in [1]. The MQ RBF-FD method are for the sake of evaluating the accuracy, effectiveness and applicability used to compute the transient voltages on the benchmark circuit and 220 kV three-phase transmission line of Viet Nam. Our numerical results are compared with those obtained by the analytical method, the traditional FD method and ATP/EMTP software. The compared results have been shown that the MQ RBF-FD method has accuracy that is higher than ones of the traditional numerical methods, especially with the optimal shape parameter.
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