Kittiratsatcha, Supat

Preferred name

Alternative Name

Kittiratsatcha, S.

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School of Engineering

supat.ki@kmitl.ac.th

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Analysis and experimental setup of a switched reluctance generator for maximum output power
(2014-01-01)
Thongprasri, P.
;
Kittiratsatcha, S.
Output power of a switched reluctance generator (SRG) in single pulse mode operation depends on control variables which consist of dc bus voltage, shaft speed, and excitation angles (turn-on and turn-off angles). This paper presents a model using equations to express maximum output power in terms of the control variables. The proposed analytical model is applied from a nonlinear magnetization curve that is used to mathematically demonstrate relationship of the control variables and to find the optimal control variables of the SRG for maximum output power. The validity of the analytical model has been confirmed by experimental results. © 2014 Praise Worthy Prize S.r.l. - All rights reserved.
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A novel output power control for variable-speed switched reluctance generators using artificial neural network
(2014-01-01)
Kerdtuad, P.
;
Kittiratsatcha, S.
This paper presents a novel output power control method for variable-speed switched reluctance generators (SRG). In the single pulse mode, the conduction angles dictate the waveform of phase current which directly influences the output power. With the proposed method, the conduction angles can be estimated from the output power profiles at several speeds using an artificial neural network (ANN). The output power profiles are simulated from a dynamic model of an 8/6 SRG and used as the training data of the network. The inputs of the network are the output power and rotor speed, and its outputs are the turn-on and turn-off angles. The proposed control scheme was developed by incorporating the trained network into the dynamic model before the simulation in MATLAB/Simulink. The experiments with the 8/6 SRG were carried out using TMS320F2812 DSP to control the SRG drive system. In addition, the optimal trained weights and biases of the network are utilized in the DSP program. The comparisons of the simulation and experimental results are made to verify the proposed method.
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Analysis of control variables to maximize output power for switched reluctance generators in single pulse mode operation
(2016-10-01)
Thongprasri, Pairote
;
Kittiratsatcha, Supat
This paper presents an analytical modeling method of optimal control variables to maximize the output power for switched reluctance generators (SRGs) in single pulse mode operation. A method to obtain the phase current equation used to determine the optimal control variables is proposed. The phase current equation is derived from the phase voltage equation in combination with the inductance model. The inductance model proposed in this paper is applied from the flux linkage function. The characteristics of the phase current and the energy conversion relations are analyzed to determine the optimal phase current shape. The analytical results indicate that the optimal shape can be generated when the SRG is controlled with the optimal control variables. The optimal shape is used for analysis based on the phase current equation to determine the optimal control variables. An 8/6 SRG experimental setup is used to validate the proposed method. The optimal control variables obtained from the proposed method are used to control the SRG. Based on the experimental results, the SRG can produce the maximum output power.
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Analysis of a switched-reluctance generator for maximum energy conversion
(2017-01-01)
Wongguokoon, Supakit
;
Kittiratsatcha, Supat
An effective analytical expression for maximum energy conversion in terms of DC-bus voltage, shaft speed, and turn-on and turn-off angles of a switched-reluctance generator (SRG) based on self-excitation mode and single-pulse operation is successfully presented. The proposed analytical model, which can describe the nonlinearity of the magnetic characteristics of an SRG with sufficient accuracy, is the key to derive the relation between maximum energy conversion and the aforementioned control variables. The optimal ratio of DC-bus voltage to shaft speed and excitation angle are proposed. Simulation and experimental results are provided to validate the analysis.
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Optimal excitation angles of a switched reluctance generator for maximum output power
(2014-01-01)
Thongprasri, Pairote
;
Kittiratsatcha, Supat
This paper investigates the optimal values of turn-on and turn-off angles, and ratio of flux linkage at turn-off angle and peak phase current positions of optimal control for accomplishing maximum output power in an 8/6 Switched Reluctance Generator (8/6 SRG). Phase current waveform is analyzed to determine optimal excitation angles (optimal turn-on and turn-off angles) of the SRG for maximum output power which is applied from a nonlinear magnetization curve in terms of control variables (dc bus voltage, shaft speed, and excitation angles). The optimal excitation angles in single pulse mode of operation are proposed via the analytical model. Simulated and experimental results have verified the accuracy of the analytical model.
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Computation program for breakdown voltages of a gas insulation under different pressures and slightly nonuniform electric fields
(2018-07-02)
Chamnong, C.
;
Chuayin, C.
;
Nganpitak, T.
;
Sontayananon, N.
;
Kittiratsatcha, S.
This paper proposes a program for computing the breakdown voltage of a gas insulation under slightly nonuniform electric field. The development of the program is based on the knowledge of gas ionization and streamer breakdown theories, so it can compute the breakdown voltage of an ideally-simulated gas-insulated system, under a certain gas pressure level that the streamer constant is known. To verify this program, several simulations of sphere-sphere electrode systems were made using COMSOL Multiphysics with differences in sphere dimensions and gap spacings referred from IEC-60052 standard. Then the AC breakdown voltage of each simulation was computed using the breakdown voltage computation function under the pressure of 101.3 kPa according to the standard. Next, the computed AC breakdown voltages were compared with the AC breakdown data from the standard. The differences between the computed and the standard AC breakdown voltages were less than 3% in all simulated cases. Then the program was developed further by creating a new function that could estimate the streamer constant of a practical gas-insulated system under various gas pressure levels and slightly nonuniform electric field. Since the streamer constant of a practical gas-insulated system with any gas pressure level could be estimated using the streamer constant estimation function, the breakdown voltage of any practical gas-insulated system should be able to be computed pragmatically. To verify the ability to compute the breakdown voltage of a practical gas-insulated system, several practical gas-insulated systems with slightly nonuniform electric field were set up under certain gas pressure levels. Then several simulations were made to represent the practical gas-insulated system those were set up. Next, the streamer constant of each simulation was estimated using the developed streamer constant estimation function. After that, the gap spacings of both practical and simulated systems were changed. Then AC breakdown test was conducted on each practical system, while AC breakdown voltage of each simulated system was computed using the breakdown voltage computation function. Finally, the computed breakdown voltages were compared with the breakdown voltages those were practically tested. The comparison was satisfactory with less than 3% differences between the computed and the tested AC breakdown voltages in all cases.
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Low voltage series arc fault detection using rogowski coil
(2018-08-13)
Sritrai, Eakburin
;
Kittiratsatcha, Supat
;
Polmai, Sompob
This paper presents series arc fault detection in low voltage ac circuit using Rogowski coil d/dt sensor. Series arc faults are simulated with various types of loads and current levels to understand the characteristic of arcing signal pattern and level. The Rogowski coil is designed to be able to detect high frequency di/dt component of the arc signal. The experimental results clearly show that by detecting the high frequency component of the di/dt, series arc fault condition can be reliably detected.
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Modeling of a switched reluctance generator using cubic spline coefficients on the phase flux linkage, inductance and torque equations
(2015-01-01)
Kerdtuad, Paiwan
;
Kittiratsatcha, Supat
This paper presents a dynamic modeling method for a switched reluctance generator (SRG) by which cubic spline coefficients are applied to the phase flux linkage, phase inductance and electromagnetic torque equations. To obtain the cubic spline coefficients, the flux linkage data of the SRG are first determined by a finite element analysis (FEA) prior to fitting into a third order polynomial equation to derive the curve fitting flux linkage data. In addition, the accuracy of the curve fitting data is verified by comparing with the FEA flux linkage data. Then, the cubic spline coefficients are applied to the proposed dynamic model of the SRG to simulate the machine behaviors. The simulations were carried out in a single pulse mode with fixed conduction angles at a rotation speed lower than, equal to and higher than a based speed of 6000 rpm. This research also presents the experimental results of an 8/6 SRG based on a TMS320F2812 DSP drive system, including the phase voltage, dc-link voltage, phase current, dcload current waveforms, as well as the output power-speed characteristics. The simulation and experimental results are compared to verify the accuracy of the proposed model.
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Comparison of vector control of two-phase induction motor using continuous and discontinuous SVPWM in terms of switching losses investigations
(2017-10-19)
Chaiyot, Rungwicha
;
Kinnares, Vijit
;
Kittiratsatcha, Supat
Vector control of unsymmetrical two-phase induction motor (TPIM) drives is attractive to researchers. Several methods have been proposed for improved TPIM drives such as V/Hz control, scalar control, direct torque control and vector control. However, a switching loss problem is serious in high switching frequency applications. The system efficiency can be improved by reducing switching losses. This paper proposes two types of modulation methods namely time-based continuous space vector PWM and time-based discontinuous space vector PWM for comparing switching losses in vector controlled twophase induction motor drives. The dynamic performance and total harmonic current distortion are discussed. Simulation results illustrate the satisfied performance of the proposed motor drive system. The control system is implemented on Matlab- Simulink. The simulation results show that the discontinuous time-based space vector PWM gives lower total loss , lower switching loss and lower total harmonic current distortion than the time-based continuous space vector PWM.
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Study of maximum power conversion of a switched-reluctance generator
(2011-08-12)
Kerdtuad, P.
;
Kittiratsatcha, S.
This paper presents the study of maximum power conversion of a Switched Reluctance Generator (SRG). The SRG is operated in single pulse mode where the rotor speed is above base speed. The turn-on and turn-off angle are varied to study the shape of the phase current which is directly related to the power conversion. A 4 Phase, 2kW, 8/6 SRG is used to collect the experimental results. The converter is the conventional 2-switched per phase and a TMS320F2812 Digital Signal Processing (DSP) is a main controller. © 2011 IEEE.

Kittiratsatcha, Supat

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