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Bac Xuan Nguyen,D. Mahinda Vilathgamuwa,Gilbert Foo,Peng Wang,Andrew Ong 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
LCL network is one of the best choices for compensating bidirectional inductive power transfer (BIPT) systems. However, H ? Bridge power converter of the conventional BIPT systems generates highly distorted AC current which results in reduced overall system efficiency particularly in high power BIPT systems. In order to overcome this drawback, a multilevel converter (MC) with selective harmonic distortion (SHE) modulation method is presented in this paper to eliminate high order harmonic components in converter voltages at both sides of BIPT systems. The proposed MC topology is constructed using a modified H ? Bridge converter with minimum number of power switches. The proposed topology is suitable for low to medium power applications. The simulation results demonstrate the feasibility of the proposed scheme.
Sketch Recognition Using LSTM with Attention Mechanism and Minimum Cost Flow Algorithm
Bac Nguyen-Xuan,이귀상 한국콘텐츠학회 2019 International Journal of Contents Vol.15 No.4
This paper presents a solution of the ‘Quick, Draw! Doodle Recognition Challenge’ hosted by Google. Doodles are drawings comprised of concrete representational meaning or abstract lines creatively expressed by individuals. In this challenge, a doodle is presented as a sequence of sketches. From the view of at the sketch level, to learn the pattern of strokes representing a doodle, we propose a sequential model stacked with multiple convolution layers and Long Short-Term Memory (LSTM) cells following the attention mechanism [15]. From the view at the image level, we use multiple models pre-trained on ImageNet to recognize the doodle. Finally, an ensemble and a post-processing method using the minimum cost flow algorithm are introduced to combine multiple models in achieving better results. In this challenge, our solutions garnered 11th place among 1,316 teams. Our performance was 0.95037 MAP@3, only 0.4% lower than the winner. It demonstrates that our method is very competitive. The source code for this competition is published at: https://github.com/ngxbac/Kaggle-QuickDraw.
Novel Carrier PWM Technique with Extension Range For 4-Switch Inverter
Nguyen Van Nho,To Huu Phuc,Nguyen Xuan Bac 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
Three-phase 4-switch voltage source inverters are advantageous for reduced number of power switches. For these topologies, space vector Pulse Width Modulation (SVM) methods have been commonly used for controlling the circuit. This paper presents a novel carrier based PWM method for 4-switch inverters, which is simple and flexible. Linear overmodulation will be also investigated. The proposed method will be mathematically analyzed and demonstrated by simulation and experimental results.
An Optimized Discontinuous PWM Method to Minimize Switching Loss for Multilevel Inverters
Nho-Van Nguyen,Bac-Xuan Nguyen,Hong-Hee Lee IEEE 2011 IEEE transactions on industrial electronics Vol.58 No.9
<P>This paper presents a novel approach to analyze carrier-based discontinuous pulse width modulation (DPWM) method for multilevel inverters. The separation of the offset into the main and additional components shows the use for analyzing PWM control characteristics of multilevel inverters. The results are then applied to propose a novel minimized loss DPWM method by varying the offset depending on peak values of three-phase load currents. As results of avoiding commutations at high currents, the switching loss can be reduced. The proposed method is theoretically analyzed and verified by experimental results.</P>
Real Time Control of an Induction Motor Using IMC Approach
Duong Hoai Nghia,Nguyen Van Nho,Nguyen Xuan Bac,Hong-Hee Lee 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.3
The paper presents a method for controlling induction motors using a nonlinear internal model control (IMC) approach. The process model and the inverse model are developed in the rotor flux coordinate. The main advantage of the proposed method is that it easily specifies the performance (steady state error, transient response, etc.) and the robustness of the controller by means of the IMC filters. Simulation results illustrate the effectiveness of the proposed method. Results on a real time system show that the control system has good performance and robustness against changes in motor parameters (rotor and stator resistances, rotor and stator inductances, rotor inertia).
Real Time Control of an Induction Motor Using IMC Approach
Nghia, Duong Hoai,Nho, Nguyen Van,Bac, Nguyen Xuan,Lee, Hong-Hee The Korean Institute of Power Electronics 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.3
The paper presents a method for controlling induction motors using a nonlinear internal model control (IMC) approach. The process model and the inverse model are developed in the rotor flux coordinate. The main advantage of the proposed method is that it easily specifies the performance (steady state error, transient response, etc.) and the robustness of the controller by means of the IMC filters. Simulation results illustrate the effectiveness of the proposed method. Results on a real time system show that the control system has good performance and robustness against changes in motor parameters (rotor and stator resistances, rotor and stator inductances, rotor inertia).