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    An approach for voltage drop improvement in 22 kV PEA distribution system based on high voltage capacitor placement
    (2023-10-01)
    Thongsuk, Surakit
    ;
    Ngaopitakkul, Atthapol
    ;
    Kotesakha, Wikorn
    ;
    Leelajindakrairerk, Monthon
    ;
    Pothisarn, Chaichan
    The distribution system has been constantly expanded with rising load demand due to population and economic growth. The result is a distribution line facing a voltage drop issue voltage drop, which results from increasing interconnected load and the distance from the substation. To mitigate this issue, this paper proposed an approach to improve the voltage level on the distribution line using a high-voltage capacitor bank. The system under study is modeled after the Provincial Electricity Authority (PEA) 22-kV distribution line. The placement of the high voltage capacitor bank will be based on the 2/3 rule technique. The PSCAD/EMTDC has been used to simulate the characteristics of the case study distribution system and evaluate the performance of the proposed technique in comparison with the PEA voltage regulation standard. The result has demonstrated the ability to use the proposed high voltage capacitor bank placement technique to improve voltage levels in the distribution system.
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    Impact on Protective Device Sequence of Operation in Case Distributed Generation Integrated to Distribution System
    (2023-07-01)
    Ngamroo, Issarachai
    ;
    Kotesakha, Wikorn
    ;
    Yoomak, Suntiti
    ;
    Kunakorn, Anantawat
    This study aims to evaluate the impact of the distributed generator (DG) connection to the grid. The simulated results present the parameters of the system required to install DG on the end of the main distribution feeder. Various parameters, such as voltage, current, and protective relay coordination are modelled after the actual provincial electricity authority (PEA) distribution system. Various case studies compared the coordination without and with DG connections to the grid by finding the difference of protective devices. The results indicate that the malfunction can be fixed in order of priority protective devices, which operate according to the parameter setting. Additionally, the coordinate functions between the recloser and fuse devices in both phase and ground configurations in the operating zone prevented the drop-out fuse melting or burning out. Based on the result, this problem is fixed by providing a directional recloser device and increasing the fuse-link rated with 40k installation for replacing the conventional sizing, which can improve the performance in case of fault occurrence to investigate the reliability and stability of the distribution system.
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    Characteristic Evaluation of Wind Power Distributed Generation Sizing in Distribution System
    (2023-03-01)
    Ngamroo, Issarachai
    ;
    Kotesakha, Wikorn
    ;
    Yoomak, Suntiti
    ;
    Ngaopitakkul, Atthapol
    Energy consumption and environmental issues have become major drivers of increasing renewable energy penetration levels. The electricity generated from renewable energy sources is decentralized throughout distributed generation (DG), which is located at the distribution level. However, the presence of DG can change distribution system characteristics and affect protection systems. Thus, this study aims to investigate the impact of DG in term of its sizing and placement on distribution systems under both normal and fault conditions. In addition, the effects on voltage improvement under normal conditions and current under fault conditions are also considered. The case study system in this study was modelled after an actual section of a 22 kV distribution line from the Provincial Electricity Authority of Thailand using PSCAD software. For DG, wind turbine generation was selected as a renewable energy source. The simulation results demonstrated that the presence of DG has a significant impact on both voltage and current characteristics under both normal and fault conditions. These impacts on the distribution system caused by DG can affect the operation of conventional distribution systems, which require further analysis and preventive measures in order to ensure good system reliability.
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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.