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Author: search.filters.author.Seewirote, BunchaHas files: No

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    Comparative Study of Solar Cells Suitable for Powering Loads in Thailand
    (2023-01-01)
    Seewirote, Buncha
    ;
    Ngaopitakkul, Atthapol
    Solar cells are a very popular renewable energy source in Thailand today. In general, there are 2 types of solar cells that have different functions and prices. Monocrystalline and polycrystalline solar cells are compared to study suitability for use in Thailand. Both solar cells are tasked with supplying power to two different loads: a lamp and a motor. Voltage, current, and power are measured in order to ascertain the solar panel's power supply characteristics and take into account the usage patterns of each type of solar cell to accommodate Thailand's solar conditions. Each type of solar cell responds to different power distribution characteristics. However, the load power should therefore be taken into account when determining which solar cell type to utilize.
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    Voltage Drop Improvement for Distribution Systems Using High Voltage Capacitor Based-on 1/2kvar Technique
    (2022-01-01)
    Patcharoen, Theerasak
    ;
    Kotesakha, Wikorn
    ;
    Ngaopitakkul, Atthapol
    ;
    Thongsuk, Surakit
    ;
    Seewirote, Buncha
    In this paper proposed the voltage drop improvement on distribution system with high voltage (HV) capacitors simply technique using PSCAD/EMTDC software. Considering, the HV capacitor placement techniques to improve voltage drop on the distribution system such as front load and 1/2kVar techniques are compared with base case (without the capacitor installation). The sizing and position of using HV capacitors are investigated and analyzed with the Provincial Electricity Authority (PEA) voltage regulation standard. Furthermore, the switching voltage transient occurred during each step of HV capacitor switching to the distribution system is also analyzed. The results claim that the voltage drop depends on HV capacitors placement that could be improved the voltage profile on distribution system as 5% increasing. Additionally, the transient voltage of each technique is hard to summarize, as it is reliable upon the sizing of HV capacitor switching in each step.
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    Impact of lightning travelling wave velocity between space and steel and impedance of 115 KV transmission tower on back-flashover overvoltage
    (2014-02-04)
    Suttisinthong, Nuchtita
    ;
    Seewirote, Buncha
    ;
    Ngaopitakkul, Atthapol
    ;
    Pothisarn, Chaichan
    This paper studies the behavior of back-ashover on the insulators with vari- ous velocities of lightning travelling wave. The simulated lightning strikes on high voltage 115 kV transmission towers by using Alternative Transients Program/Electromagnetic Transients Program (ATP/EMTP) to consider back-ashover including maximum volt- age at the cross arm and voltage across insulators. The velocity of lightning travelling wave in space (300 m/us) will be compared with travelling wave in steel of tower (200 m/us) in this paper. The results is shown that the velocity of lightning travelling wave plays an important role for the back-ashover voltage across insulator as well as the tow-fler footing resistance and the lightning stroke current. © 2014 ICIC International.
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    Application of back-propagation neural network for transformer differential protection schemes part 1 discrimination between external short circuit and internal winding fault
    (2012-12-01)
    Ngaopitakkul, Atthapol
    ;
    Jettanasen, Chaiyan
    ;
    Klomjit, Jittiphong
    ;
    Pothisarn, Chaichan
    ;
    Seewirote, Buncha
    This paper proposes an algorithm based on a combination of discrete wavelet transform (DWT) and back-propagation neural network (BPNN) for discriminating between external fault and internal winding fault of three-phase two-winding transformer. The DWT is employed for extracting the high frequency component contained in the post-fault differential current waveforms, and the coefficients of the first scale from the DWT that can detect fault are investigated as an input for the training pattern. Various cases studies based on Thailand electricity transmission and distribution systems have been investigated so that the algorithm can be implemented. Results show that the proposed technique is highly satisfactory. © 2012 IEEE.