Search

Your search keyword '"Zhang, Hualiang"' showing total 142 results
Start Over Author "Zhang, Hualiang" Publisher ieee
142 results on '"Zhang, Hualiang"'

17. A method for Rapid Deployment of Brushless DC Motor Servo System Model Based on FPGA

Author

Xie Feng, Zhang Hualiang, Liu Zihong, Zhang Tao, Wang Bolun, and Shi Zhengjin

Subjects
business.industry, Computer science, Control engineering, Servomechanism, DC motor, law.invention, Software, law, VHDL, Verilog, Synchronous motor, business, Field-programmable gate array, computer, Servo, computer.programming_language
Abstract

Recently, with the development of technology and the lucubrate of automation technology, the dependence of modern industry on synchronous motors has gone deep into the bone. In fact, the current complex control algorithms consume the computing power of the data processing chips and put forward a higher request to the ability of developers. Therefore, the emphasis of this study lies in a rapid deployment method of a brushless DC motor servo control system based on the model methods. After using Simulink software to simulate and verify the three-closed-loop servo model of the DC brushless motor, Verilog or VHDL language code will be generated, which can automatically configure the project according to the requirements. Moreover, a drive and control hardware platform based on Xilinx Zynq-7000 chips was built to verify the feasibility, the experimental results indicate that the proposed method can effectively simplify the deployment of complex algorithm codes, reduce the development cycle of brushless DC motor servo system with strong engineering practicability.

Published
2021

18. Ultrawideband Schiffman Phase Shifter Designed With Deep Neural Networks.

Author

An, Sensong, Zheng, Bowen, Tang, Hong, Li, Hang, Zhou, Li, Dong, Yunxi, Haerinia, Mohammad, and Zhang, Hualiang

Subjects
ARTIFICIAL neural networks, PHASE shifters, FREQUENCY selective surfaces, POWER dividers, ANTENNAS (Electronics)
Abstract

This article presents a novel method for the forward modeling and inverse design of a class of Schiffman phase shifters using deep neural networks (DNNs). Since DNNs are capable of mapping the highly nonlinear correlations between inputs and outputs, we constructed a fully connected DNN to predict the electromagnetic (EM) responses of Schiffman phase shifters given their physical dimensions. Based on this fast and accurate modeling tool, a cascaded inverse design DNN was then built and trained to achieve instant on-demand phase shifter designs. This approach is versatile and can be easily modified to accomplish different design goals. To demonstrate its efficacy, we trained two DNNs to realize Schiffman phase shifter designs with different bandwidths (40% and 60%) and arbitrary phase shift targets (0°–180°). Simulation results and experimental verifications substantiate that their performances are comparable with the state-of-the-art designs. Moreover, we discussed the proposed methods’ potential in dealing with design tasks that are nonintuitive and beyond the scope of the existing approaches. We envision that this DNN approach can be extended to the design of various EM components including but not limited to antennas, filters, power dividers, and frequency selective surfaces (FSS). [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

19. Adaptive Integrated Coordinated Control Strategy Based on Sliding Mode Control for MMC-MTDC

Author

Zhang Hualiang, Zhang Tao, Wang Anna, and Wang Chen

Subjects
Control theory, Computer science, business.industry, Voltage droop, Transmission system, Transient (oscillation), Modular design, Power margin, business, Sliding mode control, Power (physics)
Abstract

Traditional double closed-loop PI control and DC voltage-active power droop control are suitable for the modular multilevel converter based Multi terminal flexible DC transmission system (MMC-MTDC). However, due to the strong nonlinearity of the system and the fixed droop coefficient, the system has poor stability under transient conditions, which is prone to full load. In order to improve the response speed and stability of the system, an adaptive integrated coordinated control strategy based on sliding mode theory is proposed. The strategy adopts a double closed loop cascade control structure, the outer-loop controller performs adaptive droop control based on the comparison of the MMC real-time power margin with the power reference command, and the inner-loop controller is designed based on a sliding film variable structure with current error as the sliding film plane. The simulation model of MMCMTDC direct current transmission system was built in PSCAD/EMTDC. The simulation results of the proposed control strategy show that the control strategy can effectively avoid the full load margin of the system when the MMC is small, and the strategy also can improve the adaptability and dynamic performance of the system compared with the traditional control strategy.

Published
2021

20. A Capacitor Voltage Balancing Control Method for Modular Multilevel Converter Based on Variable Threshold Interval Sub-modules Grouping

Author

Zhang Hualiang, Wang Anna, Zhang Tao, and Wang Chen

Subjects
Computer science, business.industry, Modular design, Converters, law.invention, Capacitor, Control theory, law, Control system, Inverter, Power semiconductor device, Transient (oscillation), business, Voltage
Abstract

The sub-module capacitor voltage equalization of modular multilevel converters is the key to their stable operation. Aiming at the computation complexity and high switching frequency existing in conventional voltage balancing method of high-level modular multilevel converter, an optimal equalization control strategy based on sub-modules(SMs) priority with variable threshold interval is proposed. The number of current input modules is calculated by the nearest level modulation, then the reference value is adjusted according to the number of input modules, and based on this reference value, sets the SMs capacitance voltage threshold range to constrain the voltage distribution of SMs. The grouping order of each SM in current control cycle were determined by comparing the voltage values of SMs switched IN or OUT in last control cycle with the upper and lower limits of threshold interval. According to the direction of the bridge arm current, the sequencing order of the groups is determined, and the information of the input module is finally determined. A simulation model of three-phase inverter based on MMC is set up in MATLAB/Simulink to verify the proposed strategy can reduce the switching frequency of power devices significantly when maintaining high capacitor voltage consistency, whether in steady or transient process.

Published
2021

32. A High Performance Terahertz Metalens

Author

Li, Hang, primary, An, Sensong, additional, Zheng, Bowen, additional, Tang, Hong, additional, Fowler, Clayton, additional, Guo, Wei, additional, Zhang, Hualiang, additional, Xie, Rensheng, additional, and Ding, Jun, additional

Published
2019
Full Text
View/download PDF

36. A Hybrid Transmission-Line/SAW-Resonator Analog Signal-Interference Dual-Band Bandpass Filter.

Author

Cai, Ting, Chen, Chang, Zhang, Xiang, Lin, Fujiang, and Zhang, Hualiang

Abstract

An analog signal-interference dual-narrowband bandpass filter (BPF) by combining transmission lines and surface-acoustic-wave (SAW) resonators is proposed. The filter is based on three-path transversal filtering sections (TFSs) with two embedded one-port SAW resonators. By cascading the TFSs in-series through transmission lines, passbands with enhanced fractional bandwidths (FBWs) (i.e., larger than the electromechanical coupling coefficient $k_{t}^{2}$ of the employed acoustic-wave resonator) can be realized. For the purpose of validation, a two-stage microstrip dual-narrowband BPF with two passbands located at 868.95 and 916.5 MHz has been designed, fabricated, and characterized. It demonstrated an insertion loss (IL) of 0.89 dB at 868.95 MHz, 1.57 dB at 916.5 MHz and a bandwidth (BW) of 3.2 MHz (FBW $=3.21\,\,k_{t}^{2}$) at 868.95 MHz, and 2.3 MHz (FBW $=1.92\,\,k_{t}^{2}$) at 916.5 MHz. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

37. Mutual Coupling Reduction of Closely E/H-Plane Coupled Antennas Through Metasurfaces.

Author

Luan, Haoze, Chen, Chang, Chen, Weidong, Zhou, Lingyun, Zhang, Hualiang, and Zhang, Zhongxiang

Abstract

In this letter, a simple metasurface superstrate structure is proposed to reduce mutual coupling of both E-plane and H-plane coupled patch antennas. The proposed metasurface consists of periodic ring slots arranged on one side of the substrate. The metasurface can suppress the surface wave and partly change the coupling mode, which can achieve isolation enhancement of more than 40 dB at resonant frequency in both E/H-plane coupled patch antennas. The edge-to-edge spacing between antenna elements is 2 mm (0.023 λ0). The prototypes of E-plane and H-plane arrays with metasurfaces are fabricated, and the experimental measurements and the simulation results are in good agreement. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results