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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.
( Thanh-luan Nguyen ),( Dinh-thuan Do ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.5
Considering a dual-hop energy-harvesting (EH) relaying system, this paper advocates novel relaying protocols based on adaptive time power switching-based relaying (AR) architecture for amplify-and-forward (AF) mode. We introduce novel system model relaying network with impacts of co-channel interference (CCI) and derive analytical expressions for the average harvested energy, outage probability, and the optimal throughput of the information transmission link, taking into account the effect of CCI from neighbor cellular users. In particular, we consider such neighbor users procedure CCI both on the relay and destination nodes. Theoretical results show that, in comparison with the conventional solutions, the proposed model can achieve optimal throughput efficiency for sufficiently small threshold SNR with condition of reasonable controlling time switching fractions and power splitting fractions in concerned AR protocol. We also explore impacts of transmission distances in each hop, transmission rate, the other key parameters of AR to throughput performance for different channel models. Simulation results are presented to corroborate the proposed methodology.
Nguyen, Thanh-Luan,Lee, Hong-Hee The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.6
The power ripple in the input filter is normally ignored in the conventional model predictive control scheme (MPC) of an AC/DC matrix converter under imbalanced grid voltage conditions. Unfortunately, this power ripple causes output power and current ripples. Some methods compensate this power ripple to obtain a ripple-free output current. However, these methods are generally complicated due to the increased computational and control burden or the use of a digital filter to estimate the power ripple. Moreover, the compensation of power ripple results in current distortion on the grid side, which has yet to be fully addressed. This paper presents an improved MPC scheme to simultaneously compensate input filter power ripple and reduce grid current distortion under imbalanced grid voltage conditions. The power ripple is calculated based on the grid voltage and its 90 electrical degrees delay signal, which makes the implementation simple without grid voltage components extraction or digital filter design. Furthermore, a closed-loop current controller is proposed to reduce the harmonic distortion of the grid current. The feasibility of the proposed MPC scheme is confirmed by both simulation and experimental results.
Nguyen, Thanh Luan,Yoo, Jae Gyu,Sharma, Neelesh,Kim, Sung Woo,Kang, Yong Jun,Thi, Hai Ha Pham,Jeong, Dong Kee De Gruyter Open 2016 Annals of animal science Vol.16 No.1
<P><B>Abstract</B></P><P>Human, murine and monkey spermatogonial stem cells (SSCs) have the capability to undergo self-renewal and differentiation into different body cell types in vitro, which are expected to serve as a powerful tool and resource for the developmental biology and regenerative medicine. We have successfully isolated and characterized the chicken SSCs from 3-day-old chicken testicular cells. The pluripotency was using Periodic Acid-Schiff (PAS ) staining or alkaline phosphatase staining, and antibodies to stage-specific embryonic antigens. In suspension culture conditions SSCs formed embryoid bodies (EBs) like embryonic stem (ES) cells. Subsequently EB differentiated into osteoblasts, adipocytes and most importantly into cardiomyocytes under induced differentiation conditions. The differentiation potential of EBs into cardiomyocyte-like cells was confirmed by using antibodies against sarcomeric α-actinin, cardiac troponin T and connexin 43. Cardiomyocytes-like cells were also confirmed by RT-PCR analysis for several cardiac cell genes like GATA-4, Nkx2-5, α-MHC, and ANF. We have successfully established an in vitro differentiation system for chicken SSCs into different body cells such as osteoblasts, adipocytes and cardiomyocytes. The most significant finding of this study is the differentiation potential of chicken SSCs into cardiomyocytes. Our findings may have implication in developmental biology and regenerative medicine by using chicken as the most potential animal model.</P>