Kinnares, Vijit

Preferred name

Kinnares, Vijit

Alternative Name

Kinnares, V.

Main Affiliation

School of Engineering

vijit.ki@kmitl.ac.th

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Harmonics, power factor correction and transient overvoltage analysis in a stainless steel cold rolling mill plant system caused by voltage sags
(1999-01-01)
Boonseng, C.
;
Kinnares, V.
;
Koykul, W.
;
Payakkaruang, S.
;
Chikinee, M.
This paper presents guidelines for analyzing harmonics, power factor correction and transient overvoltage in a stainless steel cold rolling plant using sendzimir cold rolling mill process. This rolling loads operate at a wide range variation of power factors and reactive power that results in penalty to charges and bus voltages variation. In addition, the nonlinear characteristics of the rolling mill drives cause significant harmonic currents flowing through the plant and utility power system. These harmonic currents result in system voltage distortion and power loss in the system. The measurement of voltage and current auto reclosing supply voltage during power line disturbances has been performed. Voltage sag and short interruption occurrence often exist in such case study. The extended analysis of results may lead to identify problems and possible correction measures.
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Evaluation of PWM strategies based on practical findings and experimental facts for VSI-fed induction motors
(1998-12-01)
Kinnares, V.
;
Jangwanitlert, A.
;
Potivejkul, S.
This paper is concerned with the evaluation of PWM strategies based on practical findings and experimental facts for VSI fed induction motors. The measured harmonic loss factor curve for given conditions is used for the loss prediction. The comparison of harmonic losses for various PWM schemes has been made. As a result, the better understanding of PWM characteristics influencing harmonic machine losses is achieved. This will be useful for choosing the PWM schemes and parameters suitable for applications.
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Effect of motor parameter changes on harmonic power loss in PWM fed induction machines
(1999-01-01)
Kinnares, V.
;
Jaruwanchai, P.
;
Suksawat, D.
;
Pothivejkul, S.
This paper considers of the effect of motor parameter changes on harmonic loss based on experimental loss characteristic curves and the modified harmonic equivalent circuit. The investigation into harmonic loss of different induction machine features under various operating conditions has been made. These results can be used for interpreting harmonic loss mechanisms. As a consequence, possible changes to parameters to improve machine performance with regard to harmonic loss are identified.
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New technique for high voltage measurement using high voltage electric field motor
(1998-12-01)
Potivejkul, S.
;
Kinnares, V.
;
Kerdonfag, P.
In this paper, a new technique for high voltage measurement for DC and AC systems using High Voltage Electric Field Motor (HVEFM) is proposed. The rotor speed of HVEFM is linearly proportional to the applied voltage. Therefore, the input voltage can be measured by detecting the rotor speed. The range of the measured voltage level is dependent of the pressure and types of gases in HVEFM. The structure is a significant factor affecting the accuracy of measurement, and a range of measured voltage level. The Finite element (FEM) program is used for computing the voltage level and electric field distribution at any points of HVEFM. The calculated results offer a design of the appropriate structure, so that the relationship between the motor speed and measured voltage level is linear and measurement can be applicable to higher voltage level. The advantages of this technique are light, compact, easy to install, and low cost when comparing to a conventional divider technique.
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Investigation into core losses due to harmonic voltages in PWM fed induction motors
(1999-01-01)
Khomfoi, S.
;
Kinnares, V.
;
Viriya, P.
The paper focuses on mechanisms of harmonic core losses due to PWM characteristics. The relationship between modulation depth particularly at higher value of PWM strategies and loss characteristics are discussed. The PWM voltage spectra at higher modulation depth are examined for interpreting core losses associated with the interaction between individual harmonic voltages and machine features. The investigation into harmonic core loss based on no-load tests with minimized rotor copper loss and rotational loss has been made. The experimental results have shown that the increment of core losses due to PWM harmonic voltages is significant compared to a sinusoidal supply and the modulation depth has significant effect on machine core losses.
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Modified harmonic loss model in PWM fed induction machines
(1998-12-01)
Kinnares, V.
;
Potivejkul, S.
;
Sawetsakulanond, B.
In this paper, a modified harmonic loss model in PWM fed induction machines is proposed for improving the loss prediction. This model is based on the measured harmonic loss characteristics. The method for determining model parameters is given. The core and stray load losses are taken into considerations for a proposed model. The discussion of harmonic loss mechanisms particularly due to the effect of harmonic leakage flux is given.
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Design of ozone generator using solar energy
(1998-12-01)
Potivejkul, S.
;
Kinnares, V.
;
Rattanavichien, P.
This paper presents design of an ozone generator by using solar cells as energy source. 12 V dc from solar panels is transferred and converted to dc voltage -8kV with ripple frequency of 15 kHz. It was tested and compared with normally negative dc in terms of the capability of ozone production. Air is passed through electrode sets to split and recombine to form ozone by corona discharge. For electrode design, concept is based on gas ionization in highly non-uniform field [3]. Point-to-plane electrodes are selected, are tested to find out the appropriate one. The prototype system can generate ozone gas from air approximately 20 mgO<inf>3</inf>/hr.
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Kinnares, Vijit

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