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Phương Pháp Điều Chỉnh Mất Mát Giai Đoạn Độc Lập Với Điều Chế Mạch Xung Rời Đã Sửa Đổi Cho Bộ Biến Đổi Nguồn Điện Dịch bởi AI
IEEE Access - Tập 11 - Trang 115529-115555 - 2023
Minh-Hoang Nguyen, Sangshin Kwak, Seungdeog Choi
Bài báo này trình bày một kỹ thuật giảm thiểu tổn thất chuyển mạch độc lập hiệu quả cho bộ biến đổi nguồn điện 3 pha 2 mức. Một thuật toán điều chế độ rộng xung dựa trên sóng điều chế đã được sửa đổi, mang tên điều chế độ rộng xung không liên tục theo từng pha, được sử dụng để tạo ra các khoảng thời gian không chuyển mạch khác nhau cho pha có trạng thái lão hóa tồi tệ nhất bằng cách tiêm một điện ...... hiện toàn bộ
#Tuổi thọ #bộ biến đổi nguồn điện #điều chế độ rộng xung không liên tục #giảm tổn thất #độ tin cậy
On the Gaussian Cramér-Rao Bound for Blind Single-Input Multiple-Output System Identification: Fast and Asymptotic Computations
IEEE Access - Tập 8 - Trang 166503-166512 - 2020
Mohamed Nait-Meziane, Karim Abed-Meraim, Zhipeng Zhao, Nguyen Linh Trung
The Cramér-Rao Bound (CRB) is a powerful tool to assess the performance limits of a parameter estimation problem for a given statistical model. In particular, the Gaussian CRB (i.e., the CRB obtained assuming the data are Gaussian) corresponds to the worst case; giving the largest CRB among a large class of data distributions. This makes it very useful in practice since optimizing under the Gaussi...... hiện toàn bộ
#Blind system identification #Cramér-Rao Bound (CRB) #Single-Input Multiple-Output (SIMO) systems #fast and asymptotic computations
Model Predictive Based Direct Power Control Method Using Switching State Preference for Independent Phase Loss Decrease of Three-Phase Pulsewidth Modulation (PWM) Rectifiers
IEEE Access - Tập 12 - Trang 5864-5881 - 2024
Minh Hoang Nguyen, Sangshin Kwak, Seungdeog Choi
Nowadays, active rectifiers are increasingly used, particularly in grid-connected applications. The high efficiency and reliability of active rectifiers become crucial for increasing the system performance. Due to the lack of model predictive control methods considering the different aging levels among phase legs of rectifiers, this paper thus introduces a direct power control-based model predicti...... hiện toàn bộ
#Active rectifier #predictive control #direct power control #per-phase #lifetime
A Compact Dual Circularly Polarized Antenna With Wideband Operation and High Isolation
IEEE Access - Tập 8 - Trang 182959-182965 - 2020
Huy Hung Tran, Nghia Nguyen-Trong, Hyun Chang Park
This paper presents a dual-sense circularly polarized (CP) antenna with compact size, high isolation, and wideband characteristics. The antenna consists of a microstrip patch, an array of parasitic metal plates positioned around the patch, and a 90° branch line coupler as feeding structure. Unlike the conventional design method, we demonstrate that the wide isolation bandwidth can be achieved with...... hiện toàn bộ
#Circular polarization #dual polarization #patch antenna #wideband #high isolation
A Compact Wideband Circular Polarized Fabry-Perot Antenna Using Resonance Structure of Thin Dielectric Slabs
IEEE Access - Tập 6 - Trang 56333-56339 - 2018
Nghia Nguyen-Trong, Huy Hung Tran, Truong Khang Nguyen, Amin M. Abbosh
A wideband small-footprint circularly polarized Fabry-Perot resonator antenna is presented in this paper. The design employs a partial reflecting surface (PRS) consisting of thin homogeneous dielectric slabs separated by a small air gap. The PRS is analyzed using transmission line theory, which gives more insightful into the theoretical concept and provides a simple tool for design and optimizatio...... hiện toàn bộ
#Circularly polarized (CP) #dielectric slabs #Fabry-Perot resonator (FPR) #high gain #low profile #wideband
A Flexible and Bandwidth Reconfigurable Antenna for Cognitive Communication
IEEE Access - Tập 11 - Trang 89561-89567 - 2023
Huy-Hung Tran, Phuong Kim-Thi, Tung The-Lam Nguyen, Hoang Thi Phuong Thao
This paper introduces a compact antenna with bandwidth reconfigurable and flexible characteristics for cognitive radio applications. The antenna consists of a monopole as a primary radiator and is excited by a coplanar waveguide to have a single-layer design. To adjust the operating bandwidth (BW) by fixing the lower frequency and varying the upper one, an additional stub is connected to the feedi...... hiện toàn bộ
#Bandwidth reconfigurable #flexible #monopole
A Design of MIMO Antenna With High Isolation and Compact Size Characteristics
IEEE Access - Tập 11 - Trang 93948-93955 - 2023
Hung Nguyen-Manh, Duy-Phong Pham, Giang Nguyen-Hoai, Huy-Hung Tran, Nguyen Quoc Dinh
A method to significantly improve the isolation of multiple-input-multiple-output (MIMO) antenna is presented in this paper. The proposed design consists of multiple patches arranged in the H-plane configuration. Satisfactory isolation is obtained by using microstrip lines that are positioned along the radiating edges of the patches. The function of the decoupled lines is to excite an orthogonal p...... hiện toàn bộ
#High isolation #microstrip line #MIMO #patch antenna
Coupling Reduction of Extremely Closely Spaced Circularly Polarized MIMO Patch Antenna by Phase Shift Method
IEEE Access - - 2023
Huy-Hung Tran, Tung The-Lam Nguyen, Hoai-Nam Ta, Duy-Phong Pham
This paper shows a method to reduce the mutual coupling between extremely closely spaced circularly polarized (CP) multiple-input-multiple-output (MIMO) antenna. The strong coupling between dual-sense CP MIMO elements is thoroughly investigated and a method to effectively suppress the mutual coupling by controlling the phase of the coupled signal is proposed. High isolation can be achieved by usin...... hiện toàn bộ
#Circularly polarized #high isolation #grounded stub #microstrip patch #MIMO
A Simple Design of Polarization Reconfigurable Fabry-Perot Resonator Antenna
IEEE Access - Tập 8 - Trang 91837-91842 - 2020
Huy Hung Tran, Hyun Chang Park
This paper presents a simple design of high gain Fabry-Perot (FP) antenna with polarization diversity. The proposed antenna is composed of a reconfigurable microstrip patch, a partially reflective surface, and a planar metallic reflector. By electrically controlling the ON/OFF states of two p-i-n diodes, the polarization of the antenna can be switched among dual-sense circular polarization and sin...... hiện toàn bộ
#Fabry-Perot #high gain #polarization reconfigurable #PRS
Model Predictive Control Method With NP Voltage Balance by Offset Voltage Injection for Three-Phase Three-Level NPC Inverter
IEEE Access - Tập 8 - Trang 172175-172195 - 2020
Eun-Su Jun, Minh Hoang Nguyen, Sang-Shin Kwak
This paper proposes a predictive control method with offset voltage injection for achieving a neutral point (NP) voltage balance of three-phase three-level neutral point clamped (NPC) inverter, without employing a weighting factor. In order to ensure the proper and reliable operation of the NPC inverter, the NP voltage balance should be regulated in addition to the sinusoidal output current. The c...... hiện toàn bộ
#Neutral point clamped (NPC) inverter #predictive control method #neutral point (NP) voltage balance #offset voltage injection
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