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Fundamental study of NOx removal from diesel exhaust gas by dielectric barrier discharge reactor
Tran Quang Vinh,Shuya Watanabe,Tomohiko Furuhata,Masataka Arai 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.6
Due to increasingly stringent emission legislation, it is essential to find a solution of eliminating nitrogen oxides (NOx) from diesel exhaust gas. Non-thermal plasma (NTP) approach has been studied for years and has shown advantages. In this study, NOx removal from simulated diesel exhaust gas by a dielectric barrier discharge needle-to-cylinder reactor under room temperature condition is presented. The dielectric barrier consists of a diesel particulate filter (DPF) putting in the discharge field. A simulation gas of N2, NO and O2 combined with particulate matters (PM) was used as the test gas. PM was loaded from a diffusion flame PM generator. The effect of PM and oxygen fraction in exhaust gas on NOx removal characteristics was investigated experimentally. The results showed that PM promoted NOx removal reactions in the barrier discharge field but its effect was dropped following elapsed time. In addition, for PM composition,soluble organic fractions and sulphate were decreased with NOx removal. Besides, the chemical reaction mechanism inside reactor was discussed.
Quang-Vinh Tran,Won-Ho Kim,Jin-Ho Shin,Woon-Bo Baek 한국지능시스템학회 2010 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.10 No.2
This paper proposed an ECAM (Electronic cam) control system which has simple and general structure. The proposed cam controller adopted the linear and polynomial curve-fitting method to generates a smooth cam profile curve function. Smooth motion trajectory of master actuator guarantees the good performance of slave motion and has an important effect on the interpolation quality of ECAM. The auto-tuning PID velocity controller was applied to overcome the uncertainties in ECAM, and the gains of the controller are updated continuously to ensure the consistency of system performance under varying working conditions. The robustness of system against the varying load torque disturbances and noises is guaranteed by using the load torque disturbance observer to suppress the disturbance on master actuator. The velocity compensator was applied to compensate the degradation of performance of slave motion caused from the varying driving speed of master motion. The stability and validity of the proposed ECAM control system was verified by simulation results.
Quang-Vinh Tran,Tae-Won Chun,Heung-Gun Kim,Eui-Cheol Nho 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.3
The Z-source inverter (ZSI) provides unique features such as the ability to boost dc voltage with a single stage simple structure. Although the dc capacitor voltage can be boosted by a shoot-through state, the voltage stress across the switching devices is rapidly increased, so high switching device power is required at the ZSI. In this paper, algorithms for minimizing the voltage stress are suggested. The possible operating region for obtaining a desired ac output voltage according to both the shoot-through time and active state time is investigated. The reference capacitor voltages are derived for minimizing the voltage stress at any desired ac output voltage by considering the dc input voltage. The proposed methods are carried out through the simulation studies and experiments with 32-bit DSP.
Tran, Quang-Vinh,Kim, Won-Ho,Shin, Jin-Ho,Baek, Woon-Bo Korean Institute of Intelligent Systems 2010 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.10 No.2
This paper proposed an ECAM (Electronic cam) control system which has simple and general structure. The proposed cam controller adopted the linear and polynomial curve-fitting method to generates a smooth cam profile curve function. Smooth motion trajectory of master actuator guarantees the good performance of slave motion and has an important effect on the interpolation quality of ECAM. The auto-tuning PID velocity controller was applied to overcome the uncertainties in ECAM, and the gains of the controller are updated continuously to ensure the consistency of system performance under varying working conditions. The robustness of system against the varying load torque disturbances and noises is guaranteed by using the load torque disturbance observer to suppress the disturbance on master actuator. The velocity compensator was applied to compensate the degradation of performance of slave motion caused from the varying driving speed of master motion. The stability and validity of the proposed ECAM control system was verified by simulation results.
Analysis for dc Boost Control System Using Z-Source Inverter
Quang-Vinh Tran,Tae-Won Chun,Hong-Hee Lee,Jung-Ryol Ahn 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
The paper aims on an analysis for dc boost control using Z-source inverter. The modified space vector PWM method is used for controlling both the dc boost and ac output controls in the Z-source inverter. The capacitor voltage and the voltage stress of device with both the shoot-through time and modulation index are analyzed considering the zero state time of inverter. The theoretical analysis is verified with the simulation studies and experiments with 32-bit DSP.
The Algorithms for Controlling AC Output Voltage of Z-Source Inverter Using Modified SVPWM
Quang-Vinh Tran,Tae-Won Chun,Jang-Kyung Son,Lee-Hong Hee,Jung-Ryol Ahn 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
This paper deals with an algorithm for controlling ac output voltage of Z-source inverter using Modified SVPWM (abbreviated as MSVPWM). Unlike the conventional space vector pulse width modulation, MSVPWM has one extra shoot-through zero time Tsh. During shoot-through zero time, both switches in a leg are conducted simultaneously in order to boost inverter output voltage to any desirable value regardless the line voltage. The algorithm to control linearly the capacitor voltage is suggested to improve the performance of Z-source inverter system. The performance of Z-source inverter using above algorithms is demonstrated in simulation results using PSIM.”
Quang Vinh Tran,전태원(T.W. Chun),이홍희(H.H. Lee),김흥근(H.G. Kim),노의철(E.C. Loh) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.2
This paper proposes a simple starting method to arrange the rotor position of the blushless DC motor (BLDC) without additional sensors and any information of motor parameters. Both the stator current and time period for arranging the rotor position can be easily adjusted by modulating a pulse width of switching devices. Using the proposed method, it is demonstrated experimentally that the BLDC starts up very smoothly.
A Study of PLL System Operation under the Variation of Gain and Filter Loop
Quang-Vinh Tran,Tae-Won Chun,Hong-Hee Lee,Eui-Cheol Nho,Heung-Gun Kim 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
In this paper, the PLL system operation is investigated under the variation of the proportional gain and the cut-off frequency of low-pass filter in the filter loop component. Through this literature, the relation of the tracking time during transient-state as well as the voltage error at steady-state with both the gain and cut-off frequency has been examined clearly. Some simulation studies with PSIM and experiments by DSP 32-bit TMS320F2812 are carried out to validate the above mentions.
Algorithms for Controlling Both the DC Boost and AC Output Voltage of Z-Source Inverter
Quang-Vinh Tran,Tae-Won Chun,Jung-Ryol Ahn,Hong-Hee Lee Institute of Electrical and Electronics Engineers 2007 IEEE transactions on industrial electronics Vol.54 No.5
<P>This paper aims to achieve good performance for both the dc boost and the ac output voltage control of the Z-source inverter (ZSI). The algorithm to control linearly the capacitor voltage is suggested in order to improve the transient response for dc boost control of the ZSI. The peak value of the ac output voltage is used to control exactly the ac output voltage to its desired level. A modified space vector pulsewidth modulation scheme is applied to control the shoot-through time for boosting dc voltage. The proposed algorithms are verified with simulation and experiment with a 32-bit digital signal processor.</P>