Pothisarn, Chaichan

Preferred name

Pothisarn, Chaichan

Alternative Name

Pothisarn, C.

Main Affiliation

School of Engineering

chaichan.po@kmitl.ac.th

Now showing 1 - 10 of 49

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Electrical line losses indistribution system with the inclusion of very small power producer
(2012-06-12)
Chiradeja, Pathomthat
;
Pothisarn, Chaichan
Distributed generation is becoming increasingly attractive to the power industry. Several distributed generation technologies such as wind energy systems, solar energy systems, biomass, and biogas are becoming economically viable. Thai government by the Department of Alternative Energy Development and Efficiency has issued the Renewable Energy Development Plan (REDP) in order to promote the usage of renewable energy. In addition, a policy that aims to increase the electric power generation from renewable energy is to expand the amount of electrical power to connect to the distribution system. After the implementing of this policy, both of the numbers and generation capacity of distributed generation who are willing to sell the electric power are significantly increasing. Under this policy, very small power producer (VSPP) has to pay the fee of 2% of its electrical energy sold to electricity utility. The main purpose of this fee is to cover the electrical line losses due to the employment of distributed generation (DG) or VSPP. However, the suitable and fairness for both VSPP and utility is still questionable. The goal of this paper is to analyze the effect of electrical line losses with the installing DG or VSPP into the distribution system. The results of this paper can be used and created the suitable and fairness of the fee for both VSPP and utility.
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Coefficient comparison technique of discrete wavelet transform for discriminating between external short circuit and internal winding fault in power transformer
(2012-01-01)
Pothisarn, C.
;
Jettanasen, C.
;
Klomjit, J.
;
Ngaopitakkul, A.
This paper proposes a technique for detecting and identifying internal winding fault of three-phase two-winding transformer which variations of coefficients of high frequency component obtained from DWT of differential current are analyzed. The maximum coefficient details of DWT are performed as comparison indicator in order to discriminate between internal fault and external short circuit. Various cases based on Thailand electricity transmission and distribution systems are studied to verify the validity of the proposed algorithm. Results show that the proposed technique has good accuracy to detect fault and to identify its position in the considered system.
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Performance and electromagnetic compatibility of a photovoltaic power converter
(2017-07-02)
Jettanasen, C.
;
Pothisarn, C.
This study aims to evaluate the performance of DC-DC converter in photovoltaic system. Electromagnetic compatibility (EMC) characteristics, issues and its effect on photovoltaic power converter are performed and taken into consideration. ĆUK converter has been built in this research. The proposed filter circuit is also created and integrated in ĆUK converter in photovoltaic system, and tested in field testing. The EN 55011 standard has been applied as a reference in order to verify the performance of the proposed filter circuit in terms of Electromagnetic Interference (EMI) reduction in actual application.
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Relation among velocity of lightning travelling wave, lightning stroke current, and tower footing resistance to study back-flashover on the insulators in transmission tower
(2013-01-01)
Pothisarn, C.
;
Thongsuk, S.
This paper studies the impact of back-flashover on the insulators with various velocities of lightning travelling wave, the lightning stroke current, and the tower footing resistance. The impedance of transmission tower section such as top tower, upper phase, middle phase, and lower phase that is calculated with lightning velocity dependent parameters is also considered. The velocity of lightning travelling wave at 300 m/μs and 200 m/μs is compared to consider back-flashover including maximum voltage at the cross arm and voltage across insulators. The results is shown that the velocity of lightning travelling wave plays an important role for the back-flashover voltage across insulator as well as the tower footing resistance and the lightning stroke current. © 2013 Praise Worthy Prize S.r.l. - All rights reserved.
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Impact of lightning impulse voltage waveshape front time between 1.2/50 μs and 4/50 μs on back-flashover voltage across insulator of 230 KV transmission tower
(2014-02-04)
Ngaopitakkul, Atthapol
;
Pothisarn, Chaichan
This paper is a study of the behavior of back-ashover on the insulators with various lightning voltage waveshapes. The simulated lightning strikes on high voltage 230 kV transmission towers using Alternative Transients Program/Electromagnetic Transients Program (ATP/EMTP) to consider back-ashover voltage across insulators. The standard of lightning voltage waveshape (1.2/50 μs) will be compared with the other lightning voltage waveshape front time (4/50 μs) in this paper. The results are shown that the lightning voltage waveshape plays an important role for the back-ashover voltage across insulators as well as the tower footing resistance and the lightning stroke current. © 2014 ICIC International.
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Performance and electromagnetic interference mitigation of DC-DC converter connected to photovoltaic panel
(2019-11-01)
Jettanasen, C.
;
Pothisarn, C.
Renewable energy has been rapidly increased in terms of installed capacity. However, the electronic components inside such a system can cause a serious threat such as Electromagnetic Interference (EMI) to nearby sensitive devices/equipment. This paper aims to study on performance of DC-DC boost converter connected to photovoltaic panel and how to reduce EMI emissions issued in the system. A passive EMI low-pass filtering is one of various mitigation techniques. The designed converter connected to photovoltaic panel and EMI filter are tested in both simulation software and field testing by using EN55022 standard as a reference.
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Inrush current analysis for switching large shunt capacitor bank in a 230 kV substation system
(2013-12-01)
Patcharoen, T.
;
Ngaopitakkul, A.
;
Pothisarn, C.
This paper presents the simulation and investigation of switching large shunt capacitor bank in a 230kV Thailand substation system. Simulation is performed using PSCAD/EMTDC. The inrush current is generated by energizing of the 4×72 Mvar, 230 kV shunt capacitor banks. The purpose is to observe the inrush current to ensure safe and successful operations of the shunt capacitor banks. In addition, the effects of parameters such as sizing of current limiting reactor (CLR), pre-insert resistor (PIR) and 6% detuning reactor are investigated. The results of simulations are shown that the 6% detuning reactor can reduce inrush current more than other methods. © 2013 IEEE.
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Discrete wavelet transform and back-propagation neural networks algorithm for fault classification in underground cable
(2011-07-26)
Kaitwanidvilai, S.
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Pothisarn, C.
;
Jettanasen, C.
;
Chiradeja, P.
;
Ngaopitakkul, A.
This paper proposes a new technique using discrete wavelet transform (DWT) and back-propagation neural network (BPNN) for fault classifications on underground cable. Simulations and the training process for the back-propagation neural network are performed using ATP/EMTP and MATLAB. The mother wavelet daubechies4 (db4) is employed to decompose high frequency component from these signals. Positive sequence current signals are used in fault detection decision algorithm. The variations of first scale high frequency component that detect fault are used as an input for the training pattern. Various cases studies based on Thailand electricity distribution underground systems have been investigated so that the algorithm can be implemented. The results are shown that an average accuracy values obtained from BPNN can indicate the fault classification with satisfactory accuracy, and will be very useful in the development of a power system protection scheme.
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Identification of fault location for simultaneous fault in distribution system using discrete wavelet transform
(2011-04-01)
Pothisarn, C.
;
Jettanasen, C.
;
Ngaopitakkul, A.
;
Apisit, C.
Currently, the most effective technique for identifying fault location, based on a travelling wave, has been proposed in several research papers. However, the effects of simultaneous faults have been neglected. In order to overcome this problem, a new algorithm will be developed in order to predict fault location precisely. This paper presents a technique to detect fault locations, during simultaneous fault, in an underground distribution system using discrete wavelet transform (DWT). The DWT is used to detect the high frequency components. The time that the fault signal uses to reach the ends of the distribution line is considered, then, applied so that the distance of fault can be calculated. The result is found that the proposed algorithm gives satisfactory both in case of single fault and simultaneous fault. ICIC International © 2011.
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Impact of lightning travelling wave velocity between space and steel and impedance of 115 KV transmission tower on back-flashover overvoltage
(2014-02-04)
Suttisinthong, Nuchtita
;
Seewirote, Buncha
;
Ngaopitakkul, Atthapol
;
Pothisarn, Chaichan
This paper studies the behavior of back-ashover on the insulators with vari- ous velocities of lightning travelling wave. The simulated lightning strikes on high voltage 115 kV transmission towers by using Alternative Transients Program/Electromagnetic Transients Program (ATP/EMTP) to consider back-ashover including maximum volt- age at the cross arm and voltage across insulators. The velocity of lightning travelling wave in space (300 m/us) will be compared with travelling wave in steel of tower (200 m/us) in this paper. The results is shown that the velocity of lightning travelling wave plays an important role for the back-ashover voltage across insulator as well as the tow-fler footing resistance and the lightning stroke current. © 2014 ICIC International.

Pothisarn, Chaichan

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