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Tran, Quoc-Hoan,Lee, Hong-Hee The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.3
In this paper, an effective carrier-based modulation (CBM) strategy to reduce the switching losses for indirect matrix converters (IMCs) is presented. The discontinuous pulse width modulation method is applied to decrease the switching numbers in one carrier cycle, and an optimum offset voltage is selected to avoid commutations of the high output phase currents. By decreasing the switching numbers along with avoiding commutation of the high currents, the proposed CBM strategy significantly reduces the switching losses in IMCs. In addition, the proposed CBM strategy is independent of load conditions, such as load power and power factor, and it has good performance in terms of the input/output waveforms. Simulation and experimental results are provided to verify the effectiveness of the proposed CBM strategy.
Hoan Minh Tran,Tam Huu Nguyen,Viet Quoc Nguyen,Phuc Huynh Tran,Linh Duy Thai,Thuy Thu Truong,Le-Thu T. Nguyen,Ha Tran Nguyen 한국고분자학회 2019 Macromolecular Research Vol.27 No.1
The photoswitching poly(pyrene-1-ylmethyl-methacrylate-random-methyl methacrylate-random-methacrylate spirooxazine) was synthesized via atom transfer radical polymerization and characterized by proton nuclear magnetic resonance (1H NMR), gel permeation chromatography (GPC), Fourier transform infrared (FTIR) spectroscopy, UV-visible spectroscopy, and differential scanning calorimetry (DSC). The obtained copolymer exhibited the capability of erasable and rewritable photoimaging, making it a potential candidate for optical data storage materials. Moreover, the copolymer also showed the sensing ability for cyanide anions effect in aqueous solutions.
Quoc-Hoan Tran,Hong-Hee Lee 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.3
In this paper, an effective carrier-based modulation (CBM) strategy to reduce the switching losses for indirect matrix converters (IMCs) is presented. The discontinuous pulse width modulation method is applied to decrease the switching numbers in one carrier cycle, and an optimum offset voltage is selected to avoid commutations of the high output phase currents. By decreasing the switching numbers along with avoiding commutation of the high currents, the proposed CBM strategy significantly reduces the switching losses in IMCs. In addition, the proposed CBM strategy is independent of load conditions, such as load power and power factor, and it has good performance in terms of the input/output waveforms. Simulation and experimental results are provided to verify the effectiveness of the proposed CBM strategy.
Quoc-Hoan Tran,이홍희 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.3
This paper proposes a cost-effective topology to drive a three-phase open-end load based on a five-leg indirect matrix converter (IMC) and a space vector modulation (SVM) method. By sharing an inverter leg with two load terminals, the proposed topology can reduce the number of power switches when compared to topologies based on a direct matrix converter or a six-leg IMC. The new SVM method uses only the active vectors that do not produce common-mode voltage (CMV), which results in zero CMV across the load phase and significantly reduces the peak value of the CMV at the load terminal. Furthermore, the proposed drive system can increase the voltage transfer ratio up to 1.5 and provide a superior performance in terms of an output line-to-line voltage with a three-level pulse-width modulation waveform. Simulation and experimental results are given to verify the effectiveness of the proposed topology and the new SVM method.
Tran, Quoc-Hoan,Lee, Hong-Hee Institute of Electrical and Electronics Engineers 2017 IEEE transactions on power electronics Vol. No.
<P>This paper proposes a three-vector modulation (TVM) strategy for a five-leg indirect matrix converter (IMC) fed three-phase open-end load (OEL) drive to reduce common-mode voltage (CMV) with improved output performance. By utilizing three nearest active voltage vectors to generate desired output voltage, the proposed TVM strategy can eliminate the CMV across the load phase and reduce the peak value of CMV at the load terminal to 42%. Compared to other modulation strategies for the IMC fed OEL drives, the problems associated with simultaneous switching of two legs and zero-sequence current do not occur with the TVM strategy. Also, a constant average dc-link voltage is achieved by using three active current vectors to synthesize reference input current, so that the output performance of the five-leg IMC is improved regarding output current and output voltage harmonic distortions. Simulation and experimental results are provided to verify the performance of the TVM strategy.</P>
Tran, Quoc-Hoan,Lee, Hong-Hee The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.3
This paper proposes a cost-effective topology to drive a three-phase open-end load based on a five-leg indirect matrix converter (IMC) and a space vector modulation (SVM) method. By sharing an inverter leg with two load terminals, the proposed topology can reduce the number of power switches when compared to topologies based on a direct matrix converter or a six-leg IMC. The new SVM method uses only the active vectors that do not produce common-mode voltage (CMV), which results in zero CMV across the load phase and significantly reduces the peak value of the CMV at the load terminal. Furthermore, the proposed drive system can increase the voltage transfer ratio up to 1.5 and provide a superior performance in terms of an output line-to-line voltage with a three-level pulse-width modulation waveform. Simulation and experimental results are given to verify the effectiveness of the proposed topology and the new SVM method.
A SVM Method for Five-leg Indirect Matrix Converters with Open-End Winding Load
Quoc-Hoan Tran,Tuyen D. Nguyen,Hong-Hee Lee 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper presents a new space vector modulation (SVM) method for a three-phase five-leg indirect matrix converter (IMC) to drive a three-phase open-end winding load. The inverter stage of the new IMC topology is composed of five legs instead of the conventional six legs for the three-phase open-end winding load applications. The SVM method to drive the five-leg IMC is developed to operate the inverter stage as two independent three-phase inverters with five legs. The proposed configuration has the advantages such as sinusoidal input/output current waveforms, ability to boost voltage transfer ratio up to 1.5, and zero common-mode voltage across the open-end phase windings; its performance is not deteriorated compared to that of the six-leg inverter in spite of the reduced leg. Simulated results are presented to verify the effectiveness of the proposed topology and its SVM method.
Tran, Quoc-Hoan,Lee, Hong-Hee IEEE 2018 IEEE transactions on industrial electronics Vol.65 No.7
<P>This paper presents an advanced space vector modulation (SVM) strategy for a three-to-five-phase indirect matrix converter (IMC) to reduce common-mode voltage (CMV) with enhanced output performance. By replacing zero and medium voltage vectors with large voltage vectors to synthesize desired output voltage, the five-phase inverter stage modulation can reduce the CMV peak value by 47%, compared with the conventional SVM. In order to compensate the degraded output performance due to the absence of the zero voltage vectors, the rectifier stage modulation is modified by utilizing the two-vector and three-vector modulation techniques. Consequently, by combining the modulations of the rectifier and inverter stages, the proposed modulation strategy can suppress the CMV, as well as improve the output performance of the three-to-five-phase IMC. Simulation and experimental results are provided to verify the effectiveness of the proposed modulation strategy.</P>