Yoomak, Suntiti
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Item type:Publication, Classification of Capacitor Bank Switching Using Fuzzy Interference Systems in 230 kV Substation(2024-01-01); ; ; Lertwanitrot, PraikanokFlexible AC transmission systems are used for enhancing the stability, transmission efficiency, and reliability of AC grids. Additionally, the most cost-effective devices for compensating reactive power are Mechanically Switched Capacitors (MSCs). This study proposes a novel algorithm for detection and capacitor bank switching transient signals in MSC, to prevent the protective relay maloperation by these transients. The Discrete wavelet transform (DWT) is used for effective time-frequency analysis and detection of measured three-phase current signals. DWT extracts the detailed wavelet coefficients of current signals at levels 1 to 30. In addition, the fuzzy inference system (FIS) has been used to determine the type of switching transient. The proposed combination of FIS and DWT has been tested on 230 kV substation and the result demonstrated precision for the identification and classification of both transient signals in MSC with 88% accuracy rate. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Impact of Wind Power Generation Sizing on the Characteristic of Distribution System Under Fault Condition(2022-01-01); ; ; Songsukthawan, PanapongIn the recent decade, there has been a rising concern in energy consumption and environmental issues. This trend has shifted the electric authority to focus from fossil fuel to renewable energy. The distributed generation (DG) using a renewable energy source has been raising. The presence of DG can cause using renewable energy sources to cause a technical issue on system protection and operation. This paper aims to study the impact of different DG size installations on the distribution system in terms of the system characteristics. The study is done in both normal conditions and in cases of fault occurrence. The system using in this research is a 22-kV distribution system consists of Wind Power Generation as the DG connected into the distribution line that modeled after part of the Provincial Electricity Authority (PEA) in the northern part of Thailand. The simulation was done using PSCAD software. The result from simulation reveals the impact of DG on the distribution system characteristics in terms of significant change in the measured current and voltage signal. Thus, the analysis of the impact of DG on the system must be done to ensure the reliability of the power system. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Study on Installation of Neutral Ground Resistance in Very Small Power Plant Transformer(2022-01-01); ; Faults in the distribution system of the Thai electrical system occur frequently. Such faults directly affect the protective equipment of the distribution system. The protective device disconnects the circuit unnecessarily on many occasions because it detects a higher current than expected. In this study, a 22-kV distribution system and a very small power plant (VSPP) were connected. The system consists of two feeders. Feeder 1 supplies electricity directly to the load; a fault was enforced in this feeder. Feeder 2 supplies electricity directly to the load; the VSPP was connected to this feeder. The fault in Feeder 1 was simulated, and the behavior of the defense system was studied. Unnecessary disconnection of the VSPP circuit took place because the high fault current caused the overcurrent protection relay to operate instantaneously. Therefore, a neutral ground resistance was installed at the VSPP transformer to reduce the fault current, extend the relay operating time to the delay range, and reduce unnecessary disconnections of the overcurrent protection relay of the VSPP. In addition, when a fault occurs in the distribution system, the faulted phase voltage decreases, whereas the non-faulted phase voltage increases. Surge arresters and voltage transformers must be able to withstand an increase in voltage. This is also explained and discussed in this paper. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Combining Fuzzy Logic and Discrete Wavelet Transform for Accurate Fault and Inrush Current Classification in High Voltage Capacitor Banks(2024-01-01); ; The high voltage capacitor bank is a critical component in substations, essential for maintaining power quality and system stability. However, these banks are susceptible to faults and inrush currents, posing significant operational challenges. This paper presents a method for accurately classifying fault and inrush currents in high voltage capacitor banks using Fuzzy Logic and Discrete Wavelet Transform (DWT). The DWT decomposes current waveforms into frequency components, enabling the extraction of features that characterize faults and inrush currents. These features are processed by a Fuzzy Inference System (FIS), which classifies the events based on predefined rules and membership functions. The integration of DWT and FIS provides a robust framework for distinguishing between different types of faults and inrush currents with high accuracy. Simulation results demonstrate the proposed method's efficacy, showing improved performance in classification accuracy and noise robustness compared to traditional techniques. This research enhances monitoring and protection systems in power networks, ensuring more reliable operation of high voltage capacitor banks. Implementing this method allows for better fault management and minimized downtime, leading to improved overall system efficiency and stability. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Voltage Drop Improvement for Distribution Systems Using High Voltage Capacitor Based-on 1/2kvar Technique(2022-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, An Approach for Voltage Drop Improvement in Distribution Line Using High-Voltage Capacitor Bank(2025-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The study of harmonic reduction in Light Emitting Diode (LED) roadway lighting system(2016-07-25); Since electrical energy is essential in human life, it is necessary to find out a way to reduce its consumption. In the past, in Thailand, they had to provide much energy to roadway lighting system because main lighting equipment has consumed high energy to generate lighting in the roadway. But today, we are increasingly aware of energy consumption. As a result, Light Emitting Diode (LED) luminaires are considered to be used in roadway lighting system, to replace conventional inefficient lighting lamps; this is due to their greater energy efficiency, high color rendering index (CRI) (70-90), and long life. However, LED luminaires have some disadvantages concerning harmonic generation issued from LED's driver. Hence, in this paper, LED luminaire will be studied in terms of power quality improvement by using AC-side Inductor Harmonic Filter. An experimental setup will be designed to measure the electrical parameters. The experimental results show that, without the filter, LED luminaire contains much harmonic current distortion (THDi), but when inserting the filter, the harmonic current distortion is decreased. However, to ensure the overall functioning of the system, the final results of harmonic current distortion should be complied with the limit value of IEC 61000-3-2 standard. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Evaluation of the Climate Influence on the Thermal Characteristics of Residential Buildings in Thailand(2026-01-01); ; An increasing population causes more energy demand, resulting in an increased rate of electricity production. Thus, increasing the electricity production rate wastes more fuel resources. These limited resources are depleted if not used properly. Therefore, energy conservation is an essential point that we should be aware of. In addition, weather and geography are significant factors that directly affect the energy consumption rate. Fundamentally, cold regions use more energy for heating, while tropical areas use more energy for air conditioning. Therefore, if the energy used for these fundamental needs can be saved, it will effectively reduce the overall rate of energy use. Consequently, environmental factors that affect energy consumption, such as wind flow direction, building orientation, and pressure, were observed. The observation was done by simulating in a Computational Fluid Dynamics (CFD) program. At the same time, an energy-saving method is also proposed in this paper. The results showed that the proposed method can reduce the energy consumption rate, which is beneficial for the development of energy management systems in the future. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Estimation of Power Consumption in Screw Gas Compressor Installed on Natural Gas Power Plant(2025-01-01); ; The knowledge of the precise power consumption of screw gas compressors, which is the highest power requirement when compared with other equipment used in natural gas power plants, can be an indicator of energy efficiency in natural gas power plants and impact the construction cost of the project. This paper proposed a calculation method for the estimated power requirement of the screw gas compressor and verified the calculation model with data from two different natural gas power plants. The verification methodology has been done by comparing the result with the obtained power from the unit during 11 operation scenarios. The result has indicated that the proposed calculation model can achieve an error less than 5% on all of operation scenarios. Thus, the proposed estimation model can be used to simplify the calculation process for the power requirement of a screw gas compressor. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Energy Harvesting from Railway-Induced Vibrations Using Piezoelectric Nanogrid Systems(2025-01-01); ;