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 46

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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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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
;
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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An open circuit fault diagnostic technique in IGBTS for ac to dc converters applied in microgrid applications
(2011-01-01)
Khomfoi, Surin
;
Sae-Kok, Warachart
;
Ngamroo, Issarachai
An open circuit fault diagnostic method in IGBTs for the ac to dc converters used in microgrid applications is developed in this paper. An ac to dc converter is a key technology for microgrids in order to interface both distributed generation (DG) and renewable energy resources (RES). Also, highly reliable ac to dc converters are necessary to keep converters in continuous operation as long as possible during power switch fault conditions. Therefore, the proposed fault diagnostic method is developed to reduce the fault detection time and to avoid any other fault alarms because continuous operation is desired. The proposed diagnostic method is a combination of the absolute normalized dc current technique and the false alarm suppression algorithm to overcome the long fault detection time and fault alarm problems. The simulation and experimental results show that the developed fault diagnostic method can perform fault detection within about one cycle. The results illustrate that the reliability of an ac to dc converter interfaced with a microgrid can be improved by using the proposed fault diagnostic method.
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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
;
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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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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The plug and outlet for home appliances in DC low voltage micro-grid system
(2017-11-03)
Pairindra, Worapong
;
Khomfoi, Surin
This proposed paper introduces the more effectiveness of power transferring in dc micro-grid power distribution in order to comprehend the usage of home appliances. A 300V 5-level diode clamped multilevel is operated as power source for contactless power transfer with a selective harmonic elimination(SHE) technique, and the output is set at 48 V 300W with the efficiency at 92.6%. The converter generates 200 kHz switching frequency to send a highly magnetic coupling through primary coil over ferromagnetic material in tight coupling condition. The paper aims are to eliminate the electric shock, galvanic isolation and arch free in dc to dc power conversion. Additionally, the lower %THD can reduce designed parameters which mean the power density will be increased. The output will be illustrated in both simulation and implementation results.
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An EV quick charging station using a pulse frequency current control technique
(2015-08-17)
Jampeethong, Phoompat
;
Khomfoi, Surin
An electric vehicle (EV) quick charging station using pulse frequency current control technique is developed in this paper. The current source modular converter configuration is used to perform the charging pulses with both positive and negative pulse to achieve time required for an EV which is less than 30 minutes. The positive pulse charge permits the high peak current charge: this will lead to quick charging mode; whereas, the idle state can control battery temperature rise. The frequency used for pulse charge technique can be varied depending on the type and condition of a battery. The use of current source converter can offer the inherit fault tolerance capability and bidirectional power flow. PSIM 9.0.3 is utilized for simulation study and the 50 kW prototype is developed to validate the proposed notion. The simulation and experimental results illustrate that the proposed pulse frequency charging technique requires about 16 minutes to fully charge battery from 20% of SOC at 80% of SOC. The temperature rise of pulse frequency charging technique is less than 4 °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.
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Power electronics roles in Thailand smart grid
(2014-10-15)
Khomfoi, Surin
Power electronics roles in Thailand smart grid applications are discussed in this paper. Smartgrid is one of revolution technologies in electrical power system. There are three important roles concerning power electronics: renewable energy resource interface system, energy efficiency and reliability and stability. Power electronics in high power application is a key technology to develop a next generation of electrical energy system for supporting the trends of renewable energy interface, energy efficiency and electrical system stability and reliability. Promising smart grid technologies and researches, particularly in Thailand, influenced by power electronics are presented.

Khomfoi, Surin

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