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Nguyen Minh Khai,Duck-Shick Shin,Young-Gook Jung,Young-Cheol Lim 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
This paper describes a new method using random modulated strategies for switched reluctance machines. The proposed method is combined random tum-on, tum-off angle technique and random pulse width modulation technique. The purpose of this proposed method is to decrease harmonic spectrum, and thus reduce the emitted acoustical noise. A random generator is generated by linear congruential generator (LCG) using random pulse position (RPP) scheme. Simulation results show that the harmonic intensity of proposed method is better than that of conventional method.
Switched-Inductor Quasi-Z-Source Inverter
Minh-Khai Nguyen,Young-Cheol Lim,Geum-Bae Cho IEEE 2011 IEEE TRANSACTIONS ON POWER ELECTRONICS - Vol.26 No.11
<P>This paper deals with a new family of high boost voltage inverters called switched-inductor quasi-Z-source inverters (SL-qZSIs). The proposed SL-qZSI is based on the well-known qZSI topology and adds only one inductor and three diodes. In comparison to the SL-ZSI, for the same input and output voltages, the proposed SL-qZSI provides continuous input current, a common ground with the dc source, reduced the passive component count, reduced voltage stress on capacitors, lower shoot-through current, and lower current stress on inductors and diodes. In addition, the proposed SL-qZSI can suppress inrush current at startup, which might destroy the devices. This paper presents the operating principles, analysis, and simulation results, and compares them with those of the SL-ZSI. To verify the performance of the proposed converter, a laboratory prototype was constructed with 48 V<SUB>dc</SUB> input and an ac output line-to-line voltage of 120 V<SUB>rms</SUB>. The simulation and experimental results verified that the converter has high step-up inversion ability.</P>
Minh-Khai Nguyen,Young-Cheol Lim,Yi-Gon Kim IEEE 2013 IEEE transactions on industrial electronics Vol.60 No.12
<P>A new family of single-stage high-step-up boost voltage inverters based on transformers is proposed, called TZ-source inverters. By replacing two inductors in the classical Z-source inverter with two transformers, the proposed inverter produces a very high boost voltage gain when the turn ratio of the transformers is larger than 1. Compared to the trans-Z-source inverters, the proposed TZ-source inverter uses a lower transformer turn ratio, which reduces the transformer's size and weight while producing the same output voltage gain. The extension of the proposed inverter topology to dc-link-type and embedded-type topologies is presented. The operating principles, analysis, and simulation results are shown. To verify the performance of the proposed TZ-source inverter, a laboratory prototype was constructed and operated with 60-V dc input. The simulation and experimental results verified that the converter has high-step-up inversion ability.</P>
Class of high boost inverters based on switched-inductor structure
Minh-Khai Nguyen,Tuan-Vu Le,Sung-Jun Park,Young-Cheol Lim,Ji-Yoon Yoo IET 2015 IET power electronics Vol.8 No.5
<P>This study deals with a class of the switched-inductor boost inverters (SLBIs) including the DC-linked type, continuous, discontinuous and ripple input current topologies. Compared with the conventional switched boost inverters, the SLBIs add only three diodes and one inductor to obtain a strong boost factor. In comparison with the conventional switched-inductor Z-source inverters (ZSIs) for the same voltage gain at the same modulation indexes, the proposed SLBIs use one more active switch and less passive components which results in reducing the size and cost. Moreover, the efficiency of the proposed inverters is improved in comparison with the conventional switched-inductor ZSIs. Analysis and operating principles are presented. A laboratory prototype was built with 24, 36, 48 V DC input and 127 Vrms output voltage to test high boost ability of the proposed inverters.</P>
Nguyen Minh Khai,Duck-Shick Shin,Young-Gook Jung,Young-Cheol Lim 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
It is known that if harmonic spectra are reduced, then acoustic noise also reduced. Hence, this paper proposes a new random switching strategy using DSP TMS320F2812 in order to reduce the harmonic spectra of a single phase 6/6 switched reluctance machine. The proposed method combines random turn-on, turn-off angle technique and random pulse width modulation technique. A Harmonic Spread Factor (HSF) is used to evaluate the random modulation technique. The proposed method is then being simulated in Matlab/ Simulink environment. Furthermore, this algorithm has also been inspected on various switching frequency. The experimental results show that the proposed strategy provides better harmonic spectra performance than conventional strategies, i.e. And a good agreement between experimental and simulation results is obtained.
Single-Stage High Boost Quasi-Z-Source Inverter with Transformer
( Minh Khai Nguyen ) 조선대학교 공학기술연구원 2012 공학기술논문지 Vol.5 No.3
This paper proposes a new family of single-stage high boost voltage inverters based on transformer. By replacing one of the two inductors in the classical Z-source inverter with 2: 1 transformer, the proposed inverter produces a very high boost voltage gain. In comparison to the conventional trans-quasi-Z-source inverter the proposed inverter has a higher boost voltage gain with smaller shoot-through duty cycle. This paper presents the operating principles analysis and simulation results. To verify the performance of the proposed inverter, a 3 kW inverter is considered in the simulation. The simulation results agree with the theoretical analysis.
Cascaded Z-Source Inverters with Switched-Inductor and Transformer Cells
( Minh Khai Nguyen ) 조선대학교 공학기술연구원 2013 공학기술논문지 Vol.6 No.2
This paper presents an alternate-cascaded technique for Z-source inverter with combined switched-inductor and transformer cells. By changing the transformer turn ratio, the number of switched-inductor cells and shoot-through duty cycle, the proposed cascaded inverter produces high voltage gain with distributing the stresses on the passive components. This paper presents the operating principles and analysis. To verify the performance of the proposed inverter, simulation and experimental results are shown with two-cascading network.
Harmonics Reduction of 6/4 Switched Reluctance Motor by Randomized Turn-on Angle Control
Nguyen Minh Khai,Duck-Shick Shin,Young-Gook Jung,Young-Cheol Lim 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
In this paper a new method using random modulated strategy is described to decrease harmonic spectrum, and thus reduce the emitted acoustical noise of a 6/4 switched reluctance machine. The proposed method is random trigger turn-on angle while turn-off angle is fixed. A Harmonic Spread Factor (HSF) is used to evaluate the random modulation technique. Simulation results show that the high harmonics are reduced significantly. The harmonic intensity of proposed method is better than that of conventional method. The HSF of proposed method can reach at low value.
Z-Source Converter with Maximum Boost Voltage Gain
Nguyen Minh-Khai,Young-Gook Jung(정영국),Young-Cheol Lim(임영철) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
This paper proposes a new two-stage Z-source converter (TSZC). The purpose of the proposed system is to obtain the ac voltage with a maximum boost voltage for fuel cell applications as a renewable energy source. In order to provide a continuous current path, a switching strategy for the dc-ac ZSI and ac-ac ZSC of the proposed system was used. The operation principle, analysis and simulation results of 1.2 ㎾ fuel cell stack were also presented.
Single-Phase Z-Source AC-AC Converter (SZAC) with Buck/Boost In-Phase and Out-Of-Phase Operation
Nguyen Minh Khai,Young-Gook Jung,Young- Cheol Lim 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
A new family of single-phase Z-source ac-ac converter(SZAC) based on single-phase matrix converter (SPMC) is proposed in this paper. Compared to conventional Z-source ac-ac converter, the proposed SZAC has unique feature: providing a wide range of output ac voltage with buck/boost in-phase (maintaining phase angle) and buck/boost out-of-phase (reversing phase angle) operation. A new commutation strategy is used to eliminate voltage spikes on switches. The operating principle of the proposed SZAC is presented. Analysis and experimental results are also presented.