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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.
Nguyen, T.H.,Than, V.T.,Thanh, H.D.,Nguyen, V.Q.,Nguyen, K.H.,Nguyen, D.T.,Park, J.H.,Chung, I.S.,Jeong, D.G.,Chang, K.T.,Oh, T.K.,Kim, W. Pergamon Press 2015 Comparative immunology, microbiology and infectiou Vol.42 No.-
In Vietnam, highly pathogenic avian influenza (HPAI), such as that caused by H5N1 viruses, is the most highly contagious infectious disease that has been affecting domestic poultry in recent years. Vietnam might be an evolutionary hotspot and a potential source of globally pandemic strains. However, few studies have reported viruses circulating in the south-central region of Vietnam. In the present study, 47 H5N1-positive samples were collected from both vaccinated and unvaccinated poultry farms in the South Central Coast region of Vietnam during 2013-2014, and their genetic diversity was analyzed. A common sequence motif for HPAI virus was identified at HA-cleavage sites in all samples: either RERRRKR/G (clades 2.3.2.1c and 2.3.2.1a) or REGRRKKR/G (clade 1.1.2). Phylogenetic analysis of HA genes identified three clades of HPAI H5N1: 1.1.2 (n=1), 2.3.2.1a (n=1), and 2.3.2.1c (n=45). The phylogenetic analysis indicated that these Vietnamese clades may have evolved from Chinese and Cambodian virus clades isolated in 2012-2013 but are less closely related to the clades detected from the Tyva Republic, Bulgaria, Mongolia, Japan, and Korea in 2009-2011. Detection of the coexistence of virus clades 2.3.2.1 and the very virulent 1.1.2 in the south-central regions suggests their local importance and highlights concerns regarding their spread, both northwards and southwards, as well as the potential for reassortment. The obtained data highlight the importance of regular identification of viral evolution and the development and use of region-specific vaccines.
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.
Adaptive Wavelet CMAC Tracking Control for Induction Servomotor Drive System
Thanh-Quyen Ngo,Mien-Ka Duong,D. C. Pham,Duc-Nam Nguyen 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.1
This research proposes an enhanced control system for induction servomotor to obtain the high-precision position tracking based on wavelet cerebellar model articulation controller. The proposed controller combines the wavelet cerebellar articulation model (WCMAC) with compensator controller to have high performance for the system. The superior properties of the WCMAC are its fast learning of the CMAC and wavelet decomposition capability. Therefore, it is used to mimic a model-based controller with exactly unknown parameters. The compensator controller with an estimated boundary error attenuates the effects of disturbances due to time-varying parameters and load acting on the shaft of motor. The online learning rules of WCMAC derived from gradient-descent method and Lyapunov function is used to estimate bound error to ensure the stability of the system. The experimental results for induction servomotor are provided to conclude the effectiveness of the proposed control system even the dynamic model of the induction servomotor is completely unknown.
Nguyen, T.H.,Than, V.T.,Thanh, H.D.,Kim, W. Pergamon Press 2016 Comparative immunology, microbiology and infectiou Vol.46 No.-
<P>A rare human/feline-like rotavirus G3P[9] strain, CAU14-1-262, from a 2-year-old girl with severe gastroenteritis was isolated and sequenced. The 11 gene segments of the CAU14-1-262 strain possessed a novel genotype constellation, G3-P[9]-I3-R3-C3-M3-A3-N3-T1-E3-H6, which was identified for the first time. Phylogenetic analysis of this strain identified the following genome origins: VP7, VP4, VP6, VP1-VP3, NSP1, NSP2, and NSP4 genes possessed an AU-1-like genotype 3 constellation with high sequence identity to those of the feline and human/feline-like rotaviruses; NSP5 possessed a H6 lineage, with highest sequence identity to the human/feline-like E2541 strain; and the NSP3 gene possessed a Wa-like genotype 1 constellation with high sequence identity to those of the of human rotaviruses. These results provided evidence of multiple reassortment events in G3P[9] rotavirus CAU14-1-262 and possibility of feline-to-human interspecies transmission. (C) 2016 Elsevier Ltd. All rights reserved.</P>