Khomfoi, Surin

Preferred name

Khomfoi, Surin

Alternative Name

Khomfoi, S.

Main Affiliation

School of Engineering

surin.kh@kmitl.ac.th

Now showing 1 - 10 of 65

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Development of a Cascaded Half-bridge Converter with Contactless Transformer in DC Microgrid
(2016-01-01)
Pairindra, Worapong
;
Khomfoi, Surin
A high efficiency cascaded half-bridge converter for contactless transformer with 1 A, 5 V and 600 kHz for mobile phone charger application is implemented in this paper by using simple PI discrete algorithm controller. The proposed target is to achieve the arch free, controllable voltage and galvanic isolation outlet and plug power transforming converter in a dc low voltage household power distribution. For the optimized outcome, the parameters are calculated and verified by MATLAB/Simulink program for bench testing. Additionally, this paper will be presented in both of the simulation and implementation results.
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Fault Detection and Predictive Maintenance Paradigm for Solar PV Systems
(2024-01-01)
Limpaporn, Poompat
;
Khomfoi, Surin
This research paper introduces the Box Plot model for the fault detection and degradation analysis in solar photovoltaic (PV) systems. The suggested method contains a mathematics equation and systematic flowchart algorithm to detect and categorize various fault types, such as direct current (DC) ground fault, DC overvoltage fault, and partial shading. The technique evaluates and monitors the performance and degradation of PV panel by processing comprehensive input data such as voltage, current, irradiance, temperature, power, solar PV systems related data and PV panel parameter data. The Box Plot model efficiently monitors fault analysis and degradation detection, adapting to various operational conditions with accuracy, resulting in a powerful tool for assessing the reliability and performance of solar PV systems. The Box Plot model is tested by using the three sets of the solar PV power plant collected data from the PV panel strings in the same array that nearby each other and verifying the Box Plot model effectiveness by comparing the model analysis result with the solar PV power plant operation and maintenance report. This methodology makes a major contribution to predictive maintenance operations and ensuring more reliability for the PV systems.
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Hamiltonian-Differential Flatness Control Laws for Battery/Ultracapacitor for Hybrid Electric Vehicle Applications
(2023-01-01)
Mungporn, Pongsiri
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Khomfoi, Surin
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Inteeworn, Ridtee
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Gonmanee, Apinun
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Pierfederici, Serge
This paper introduces the Hamiltonian-differential flatness control laws specifically designed for battery and ultracapacitor (UC) hybrid vehicle systems. The main goal of these control laws is to effectively manage power flow and optimize energy utilization in hybrid systems combining batteries and UC. The proposed control laws use Hamiltonian control and differential flatness techniques to dynamically regulate the energy distribution between the battery and UC, particularly in the context of constant power load (CPL) challenges within DC Microgrid applications, including vehicle systems. To confirm the efficiency of the proposed control strategy, the experimental test bench has been set up with a Li-ion battery module (LFeLi-48100TB, 48 Vdc, 100 Ah) and a UC module with a capacitance of (188.88 F, 51.3 V.) Finally, the experimental results confirm the exceptional performance of the studied control law throughout the load-drive cycles.
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Active power control technique of a BESS and crate parameter consideration for AC microgrid applications
(2019-03-01)
Prompinit, Krisada
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Khomfoi, Surin
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Pairindra, Worapong
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Manee-In, Chaitouch
This paper presents the active power control of a BESS to reduce the PV power fluctuation problem by using the ramp rate control technique, including the C-rate parameter for the AC microgrid system applications, by simulating and designing the battery management system (BMS). The suitable power of BESS power rating can be estimated from the power ramp rate (PRR) of the PV power generation system. Based on the simulated results, it is found that high electrical discharge caused the temperature inside the battery to rise higher than that of low-voltage discharge, and with the simulation results from Real Battery Management System Program, the software can control the charging and discharging of BESS's active power and display real-time results via the display screen.
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Reactive power compensation for solving voltage problems in PV farm based upon IEC - 61850
(2017-11-03)
Uaroon, Suntichai
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Khemmook, Panya
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Khomfoi, Surin
Reactive power compensation for solving voltage problem in PV farm based upon IEC 61850 is presented in this paper in order to control voltage within acceptable range. The Volt/VAR control is used in solar inverter of PV farm to improve power quality and also reduce the disconnection of solar inverter caused by overvoltage. So, the owner of PV farm will get more opportunity to sell solar electricity back to the grid. For Volt/VAR control, solar inverter with PQ mode is used to control the active and reactive power of the system. Electricity data from substation are sent to PLC based upon IEC 61850, which is the standard communication of electrical substation system. In this paper, simulation result verifies that Volt/VAR can be improve a power quality in a PV farm.
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A quick charger station for EVs using a pulse frequency technique
(2013-12-31)
Praisuwanna, Chetnaphat
;
Khomfoi, Surin
The half bridge modular converter configuration is used to perform the charging pulses with both positive and negative pulse. The positive pulse charge permits the high peak current charge: this will lead to quick charging mode; whereas, the negative pulse and idle state can offer low battery temperature rise. The frequency used for pulse charge technique can be varied depending on the type and condition of a battery. PSIM 9.0.3 is utilized for simulation study and the 500 W prototype is developed to validate the proposed notion. The simulation and experimental results illustrate that the proposed pulse frequency charging technique requires shorter time to fully charge battery at SOC 80% comparing to conventional constant current and constant voltage technique about 3 times at same average charging current. The temperature rise of pulse frequency charging technique is less than a conventional one about 1 °C: these can lead to quicker charge and longer battery lifetime. The results suggest that the proposed technique can be applied for an electric vehicle quick charger station. © 2013 IEEE.
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Battery Monitoring System for DC Distribution in a Substation Using Travelling Wave Theory
(2018-07-02)
Nakjuy, Kiadtisak
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Khomfoi, Surin
Battery monitoring system for dc distribution applying in a substation is presented in this paper. Both MEA and PEA substation uses lead acid type batteries for a de distribution using as a backup source. Therefore, a battery monitoring is a key function in a charger to check battery condition; however, a traditional charger used in a substation does not have this function. A lead acid battery first order equivalent circuit is utilized to analyze the battery condition by probing an internal resistance of a battery. A first order equivalent circuit is used to determined battery parameters using transient response analysis. PSIM is also used to simulate the proposed equivalent circuit properties comparing to experimental result. The experimental results are conducted by using three lead acid batteries which are used in a PEA substation. The travelling wave theory is also applied to determine the health of under tested batteries. Both simulation and experimental results show that the proposed technique is promising technique to implement in a charger function for detecting a battery condition as a proactive maintenance.
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Smart Home Energy Management using BEVSE for Vehicle-to-Home (V2H) Systems
(2025-01-01)
Ketjaem, Supakorn
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Khomfoi, Surin
This paper presents a method for managing household energy consumption and production in homes utilizing electric vehicles (EVs). The approach integrates a Home Energy Management System (HEMS) with Bidirectional Electric Vehicle Supply Equipment (BEVSE), which enables both charging and discharging of EVs using Vehicle-to-Home (V2H) and Vehicle-to-Grid (V2G) technologies. These technologies allow EVs to supply power to household appliances and feed energy back into the grid while ensuring that energy consumption and distribution remain within the meter's capacity limits. Simulation results from MATLAB Simulink demonstrate that this approach helps prevent potential damage to the power system, mitigates energy shortages, and enhances grid stability.
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Analysis of dv/dt filter installation for PWM AC drive applications
(2011-12-01)
Mart-Ro, Pravit
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Sae-Kok, Warachart
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Khomfoi, Surin
The aim of this paper is to analyze and propose the installation of a cascaded dv/dt filter for PWM AC drive system with long feeding cable. The effects of installing single and cascaded second order dv/dt filters are investigated and compared. The investigated system is simulated by MATLAB/Simulink program and implemented to substantiate the effectiveness of a cascaded dv/dt filter. Both simulation and experimental results show that the system using the cascaded dv/dt filter can extend the cable length longer than the system using only a single dv/dt filter. © 2011 IEEE.
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A Review of Converters for Green Hydrogen Generation in Consideration of Renewable Energy
(2024-01-01)
Vivanthanarot, Saman
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Khomfoi, Surin
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Phophongviwat, Teeraphon
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Somboonpanya, Nattapon
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Phongsawat, Suwaphit
Hydrogen is set to revolutionize the future energy landscape with its wide-ranging applications across various sectors. With global decarbonization objectives, water electrolysis provides a sustainable way to produce hydrogen, especially when it is driven by renewable energy sources. This process predominantly utilizes grid electricity, but the growing implementation of renewable energy-powered microgrids presents an attractive alternative for hydrogen production. The produced hydrogen can be used not only for electrical generation within the microgrid but also for local heating and as a fuel for transportation. Power converters are crucial in ensuring stability and reliability in hydrogen production. The paper reviews the power electronics converters required to match the DC and AC voltage source with the needs of electrolyzers. Moreover, this paper explores the technologies of electrolyzers powered by renewable energy sources, with a particular focus on wind turbines and PV.

Khomfoi, Surin

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