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Nguyen, Tuyen D.,Lee, Hong-Hee,Nguyen, Hoang M. The Korean Institute of Electrical Engineers 2010 Journal of Electrical Engineering & Technology Vol.5 No.2
This paper proposes an adaptive carrier-based pulse width modulation (PWM) method for a four-switch three-phase (4S3P) inverter under dc-link voltage ripple conditions. The proposed method guarantees balanced output currents despite of the existence of the voltage oscillations across two dc-link capacitors. And also, this new approach achieves a linear over-modulation with calculation time reduction. Simulation and experimental results are given to validate the feasibility of the proposed method.
Carrier-based PWM Method for Four-Leg Very Sparse Matrix Converter
Tuyen D. Nguyen,Hong-Hee Lee 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
The matrix converters are a good alternative to back-to-back converter in variable speed AC generation to supply energy to a stand-alone load or grid. In case of the unbalanced load, the four-leg matrix converter is required because this topology can effectively provide a path of neutral current. In this paper, a carrier-based PWM modulation is proposed to control the four-leg very sparse matrix converter. The proposed method has less computation complexity for digital signal processor. The algorithm uses only one carrier signal to generate PWMs for both rectifier stage and inverter stage control. The simulation and experimental results are provided to validate the feasibility of the proposed method.
A New SVM Method for an Indirect Matrix Converter With Common-Mode Voltage Reduction
Nguyen, Tuyen D.,Hong-Hee Lee IEEE 2014 IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS - Vol.10 No.1
<P>A new space vector modulation (SVM) process for use in an indirect matrix converter (IMC) has been proposed in this paper to reduce the common-mode voltage (CMV) in a high voltage transfer ratio. The principles of selecting suitable active vectors and then properly arranging the switching sequence in the inverter stage of the IMC are described. The IMC with the new SVM method significantly reduces the peak-to-peak voltage of the CMV without any extra hardware. The new SVM method has some other advantages such as a lower total harmonic distortion of line-to-line output voltage and a reduced switching loss at the inverter stage through a minimum number of switching commutations as compared to the conventional reduced CMV-SVM method. The proposed modulation can be easily implemented in software without any additional hardware modifications. Both simulation and experimental results are shown to demonstrate that the new SVM method can generate good performance of the input/output waveforms and provide CMV reduction.</P>
Dual Three-Phase Indirect Matrix Converter With Carrier-Based PWM Method
Nguyen, Tuyen D.,Hong-Hee Lee IEEE 2014 IEEE transactions on power electronics Vol.29 No.2
<P>This paper proposes an indirect matrix converter (IMC) topology with dual three-phase outputs and its effective carrier-based pulse width modulation (PWM) method. The proposed IMC topology can independently supply ac power for two three-phase loads from a single three-phase ac power source. This converter consists of a rectifier stage used in traditional three-phase IMC and a five-leg inverter. Besides a proposed IMC topology, the carrier-based PWM method suitable for this converter is also introduced. The proposed PWM method is easily implemented by using only one symmetrical triangular carrier signal to generate the PWM signals for a rectifier and five-leg inverter. Proposed IMC topology features the advantages of conventional three-phase IMC, such as sinusoidal input/output current waveforms, controllable input power factor, and simple commutation at the rectifier stage. Analysis, simulation, and experimental results are provided to demonstrate the advantages of the proposed IMC topology with dual three-phase outputs and to validate the effectiveness of the applied modulation strategy.</P>
Carrier Phase-Shift PWM to Reduce Common-Mode Voltage for Three-Level T-Type NPC Inverters
Nguyen, Tuyen D.,Phan, Dzung Quoc,Dao, Dat Ngoc,Lee, Hong-Hee The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6
Common-mode voltage (CMV) causes overvoltage stress to winding insulation and damages AC motors. CMV with high dv/dt causes leakage currents, which create noise problems for equipment installed near the converter. This study proposes a new pulse-width modulation (PWM) strategy for three-level T-type NPC inverters. This strategy substantially eliminates CMV. The principle for selecting suitable triangle carrier signals for the three-level T-type NPC is described. The proposed method can mitigate the peak value of CMV by 50% compared with the phase disposition pulse-width modulation method. Furthermore, the proposed method exhibits better harmonic spectrum and lower root mean square value for the CMV than those of the reduced-CMV method on the basis of the phase opposition disposition PWM scheme with modulation index higher than 0.5. The proposed modulation can easily be implemented using software without any additional hardware modifications. Both simulation and experimental results demonstrate that the proposed carrier phase-shift PWM method has good output waveform performance and reduces CMV.
Tuyen D. Nguyen,Hong-Hee Lee,Hoang M. Nguyen 대한전기학회 2010 Journal of Electrical Engineering & Technology Vol.5 No.2
This paper proposes an adaptive carrier-based pulse width modulation (PWM) method for a four-switch three-phase (4S3P) inverter under dc-link voltage ripple conditions. The proposed method guarantees balanced output currents despite of the existence of the voltage oscillations across two dc-link capacitors. And also, this new approach achieves a linear over-modulation with calculation time reduction. Simulation and experimental results are given to validate the feasibility of the proposed method.
Field Oriented Control for Induction Motor Using Four Switch Three Phases Inverter
Nguyen D. Tuyen,Nguyen M. Hoang,Hong-Hee Lee,Tae-Won Chun 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
This paper presents a space vector pulse width modulation (SVPWM) technique for four-switch three-phase (4S3P) inverter topology. The method aims to apply Field Oriented Control (FOC) of Induction motor using 4S3P. The simulations are carried out and the experimental results are given to verify the feasibility of this method.
Carrier Phase-Shift PWM to Reduce Common-Mode Voltage for Three-Level T-Type NPC Inverters
Tuyen D. Nguyen,Dzung Quoc Phan,Dat Ngoc Dao,Hong-Hee Lee 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.6
Common-mode voltage (CMV) causes overvoltage stress to winding insulation and damages AC motors. CMV with high dv/dt causes leakage currents, which create noise problems for equipment installed near the converter. This study proposes a new pulse-width modulation (PWM) strategy for three-level T-type NPC inverters. This strategy substantially eliminates CMV. The principle for selecting suitable triangle carrier signals for the three-level T-type NPC is described. The proposed method can mitigate the peak value of CMV by 50% compared with the phase disposition pulse-width modulation method. Furthermore, the proposed method exhibits better harmonic spectrum and lower root mean square value for the CMV than those of the reduced-CMV method on the basis of the phase opposition disposition PWM scheme with modulation index higher than 0.5. The proposed modulation can easily be implemented using software without any additional hardware modifications. Both simulation and experimental results demonstrate that the proposed carrier phase-shift PWM method has good output waveform performance and reduces CMV.
Simplified Model Predictive Control for AC/DC Matrix Converters with Fixed Switching Frequency
Thanh-Luan Nguyen,Huu-Nhan Nguyen,Tuyen D. Nguyen,Hong-Hee Lee 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Model predictive control (MPC) is emerging as an attractive method to control AC/DC matrix converter (MC). However, the high computational burden and variable switching frequency in the conventional MPC (CMPC) is an obstacle for its real application. In order to overcome these problems, this paper presents a simplified model predictive control (S-MPC) with fixed switching frequency. The S-MPC eliminates all source current predictions in the C-MPC by using the required input current vector (RICV). Then, to achieve the fixed switching frequency, a combination of three input current vectors is selected to synthesis the RICV. By considering the location of RICV, the S-MPC can select the best combination without the cost function evaluations for all of the six candidate combinations. Therefore, the computational burden is significantly reduced in the S-MPC without degrading of the control performance. Simulation results are given to validate the effectiveness of the S-MPC.
A Simple SVM Technique to Eliminate Common-mode Voltage for Matrix Converters
Huu-Nhan Nguyen,Tuyen D. Nguyen,Thanh-Luan Nguyen,Hong-Hee Lee 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In a matrix-converter (MC) system, commonmode voltage (CMV) causes damage to the motor bearings and other equipment. When the MC is controlled by means of space vector modulation (SVM), zero-CMV can be achieved by using only rotating-vector states to drive the MC. However, as the computation becomes quite complicated, it is not easy to apply the rotating-vector states in practice. This paper presents a simple SVM technique using rotating-vector states to eliminate the CMV for MCs. Based on the conventional SVM method, the proposed SVM technique achieves the zero CMV for MCs within a few simple steps by considering the relationship between active-vector and rotating-vector states. The performance and effectiveness of the proposed technique are verified by simulation results.