Chompoo_Inwai, Chow

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Chompoo_Inwai, Chow
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Chompoo-Inwai, Chow
Chompoo-inwai, Chow
Chompooinwai, Chow
Chompoo-inwai, C.
Chompoo-Inwai, Chai Chow
Chompoo-Inwai, Chow Chai
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chow.ch@kmitl.ac.th

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    Research of Magnetic and Electric Fields to Design and Develop the Prototype of Magnetic Resonance Imaging Device
    (2025-01-01)
    Chompoo-Inwai, Chai
    ;
    Chompoo-Inwai, Chow
    ;
    Suksathit, Witchayaphorn
    ;
    Kaewpromrat, Weerapat
    ;
    Maneerat, Saranyu
    This research presents a study and preliminary design of a main magnetic field generation system for an MRI machine using simulation software. The objective is to investigate the factors affecting magnetic field strength. Six coil models were preliminarily designed and simulated to analyze the magnetic field behavior. Simulation results were compared with experimental magnetic field measurements, showing that the software accurately reproduces the magnetic field. It was found that distributed winding improves field uniformity, and that both the number of coil turns and conductor size directly affect the strength of the main magnetic field in the air core.Based on the simulation outcomes, a prototype magnetic field generation system was designed. The proposed prototype consists of an aluminum core with a diameter of 110 mm and a height of 335 mm, suitable for arm imaging. The system uses a superconducting NbTi wire wound 6,516 turns in eight segments, with a current of 120 A. Cooling is achieved using a cryocooler model RDE-418D4 4K, which can reach temperatures as low as 4.2 K. This study provides essential guidance for the development of main magnetic field systems in future MRI devices.
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    Novel Techniques for Critical Load Buses Identification and Load Bus's Available Capacity Calculation to Improve Power System Stability
    (2020-07-01)
    Wannoi, Narumon
    ;
    Jirsuwankul, Nirudh
    ;
    Chompoo-Inwai, Chow
    ;
    Chompoo-Inwai, Chai
    ;
    Wannoi, Chaisit
    this paper presents two novel techniques for critical load buses identification and load bus's available capacity (LBAC) calculation to improve power system stability. The critical load bus identification is applied by contingency analysis considering system violation limits under load shedding impact. The violation limits consist of two limits including voltage and percent loading limits of power transfer equipment. As the LBAC calculation, the available transfer capability (ATC) of all multi-lines connected on each load bus are investigated with the total transfer capability (TTC). To validate the effectiveness of the proposed approach, the modified Thailand power system during summer peak load in areal (load center) is used for a system base case. As the results, it is found that the proposed techniques can effectively obtain and rank critical load buses as well as to calculate the LABC. The strong relation between these two indexes can be applied to improve power system stability.
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    Design optimization of wind power planning for a country with low-medium-wind-speed profile
    (2008-10-13)
    Chompoo-Inwai, Chai
    ;
    Chompoo-Inwai, Chow
    ;
    Leelajindakrairerk, Monthon
    ;
    Banjongjit, Sulee
    ;
    Fuangfoo, Pradit
    The emerging energy crisis resulting from a high price of crude oil has drawn attention about renewable energy all over the world. Thailand is a developing country located at the heart of Southeast Asia, with about 66 million of population as of 2006. The electricity supply industry structure under the government of Thailand has been managed by the Electricity Generating Authority of Thailand, the Metropolitan Electricity Authority, and the Provincial Electricity Authority for almost 50 years. According to the 2004 Power Development Plan, the country would have generation reserve at a marginal of 15%. Due to the rapid economic growth and difficulty in building new centralized generating facilities, this has the potential to create a security issue of electricity energy shortage and may develop a severe system blackout. Renewable energy issues have been widely discussed and debated over the country. Although solar energy is the most prominent renewable energy source due to the appropriate geographic of Thailand, it is still considered as a low-density energy source which requires a large area of installation. Therefore, for the long-term investment, wind power seems to be a good candidate because it is quick to install, needs no fuel cost, and is environment friendly. Therefore, this paper investigates the impact of the penetration level of wind power generation to be integrated into the Thailand system. System stability has been observed in various system configuration changes due to different control strategies of wind farms. The economic analysis of wind-farm investment has been also considered. © 2008 IEEE.
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    Analysis of winding temperature and design of distribution transformer for improving short circuit withstand capability under renewable generations mixed environment
    (2018-01-01)
    Suechoey, Boonlert
    ;
    Boonseng, Chongrak
    ;
    Chompooinwai, Chow
    ;
    Chompoo-Inwai, Chai
    Under renewable generations mixed in today's modern grid system, many of renewable generation resources tend to increase the fault level to an existing power system. Rules and regulation for power equipment and devices need to be revised and updated, of course, no exception for the distribution transformers. This article, therefore, presents the evaluation and analysis of the winding temperature on both loading and short circuit conditions of an oil-immersed distribution transformer and propose the novel transformer design method for improving short circuit withstand capability. In the study, the methodologies of measuring and estimating the winding temperature of the transformer during short circuited are presented and implemented. In the study, various winding parameters are analysed including: the winding temperature, the hottest temperature of the winding after a short circuit, the short circuit current, short circuit force and short circuit duration. The tested and analysed result are benefit for the newly proposed distribution transformer design of a 400 kVA 3 phases 50 Hz 22 kV-400/230 V, Dyn11. The new design approaches will enable designers to find a weak spot and proper selection of raw materials, such as winding size, insulation thickness and properties of the silicon steel for a better quality of distribution transformer. Moreover, the new design can offer lower winding temperature rise of transformer while loading or experiencing with short circuit conditions meaning that it can prolong transformer insulation and extend transformer lifetime.