Feng Wang

Hunan University

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Fang Zhuo

University of Ottawa

114

Jiachen Tian

Xi'an Jiaotong University

Hao Yi

Zhejiang University

Tianhua Zhu

University of California, Merced

Kefan Yu

Xi'an Jiaotong University

Shuhuai Shi

Xi'an Jiaotong University

She Chen

Hunan University

Haotian Deng

State Key Laboratory of Electrical Insulation and Power Equipment

Yating Gou

Xi'an Jiaotong University

Qiuqin Sun

Hunan University

Cooperative Institutions

Xi'an Jiaotong University

181

Chinese Academy of Sciences

Hunan University

North China Electric Power University

State Key Laboratory of Electrical Insulation and Power Equipment

Tsinghua University

University of Chinese Academy of Sciences

Shanghai Jiao Tong University

Huazhong University of Science and Technology

China Southern Power Grid (China)

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Node Sensitivity Analysis Method for Power Quality Control of High Proportion Distributed Photovoltaic Access Distribution Network

2022 IEEE International Conference on Advances in Electrical Engineering and Computer Applications (AEECA) (2021)

Lei Zhou Feng Wang Xutao Li Min Liu Hanhua Zhang

Composite energy storage device is an effective method to solve series power quality problems caused by the excessive proportion of decentralized photovoltaic power generation incorporated into the distribution network, such as instantaneous power, voltage and harmonic pollution. A node sensitivity analysis method for power quality control of high-proportion distributed photovoltaic access distribution network is proposed, and the location and size of composite energy storage devices are quickly solved. Firstly, an optimization planning model for location and capacity of composite energy storage devices is established, which includes multi-objective optimization functions such as node voltage deviation, current total harmonic distortion rate and installation cost. Secondly, the sensitivity analysis method is used to preprocess all nodes to reduce the number of candidate nodes, and the feasible installation node alternative set of the composite energy accumulation device optimization planning model is obtained. In the process of using the improved multiobjective particle swarm optimization algorithm to solve the model, the amount of calculation is greatly reduced and the optimization efficiency is improved. Finally, taking IEEE 33 - bus distribution system as an example, the simulation results show the superiority of the node sensitivity analysis method.

10.1109/aeeca52519.2021.9574229

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Citations (1)

A Novel Real-time Voltage and Frequency Compensation Strategy for Photovoltaic-based Microgrid

IEEE Transactions on Industrial Electronics (2014)

Hongtao Shi Fang Zhuo Hao Yi Feng Wang Dong Zhang

Weather-dependent photovoltaic (PV) system power variation may become frequent and rapid, which could be regarded as perturbation for the microgrid (MG). This perturbation would lead to voltage and frequency fluctuations and dramatically degrade the MG performances. Conventional secondary control strategy could restore the voltage and frequency after a certain time delay, but it cannot satisfy the speed demands when frequent and rapid perturbations appear. To overcome the limitation, this paper proposes a novel real-time voltage and frequency compensation strategy to suppress the fluctuations. The proposed strategy realizes voltage regulation by an adaptive virtual impedance loop and realizes frequency regulation by a virtual frequency-impedance loop. The novel real-time strategy is simple to be implemented and needless of communication; therefore, it is much more suitable for the PV-based MG. Finally, a PV-based MG is established as laboratory prototype, and experimental results validate the effectiveness of the proposed method.

Microgrid

10.1109/tie.2014.2371434

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Citations (67)

A Topology Improvement Method of Cascaded DC Transformer for Improving its Fast Recovery Capability

Nan Zhang Feng Wang Runchu Ding Shuhuai Shi Fang Zhuo

This paper first analyzes the fault characteristics of a dual active bridge topology with switched capacitors (SCDAB) when a port short-circuit fault occurs on the input side. At the same time, an improved topology (FBDAB) is proposed, which can use its unique freewheeling charging stage to recharge the capacitor voltage to supplement the power loss to a certain extent, which is beneficial to the rapid recovery of the DC transformer after failure and speeds up the restart process. Finally, in the simulation software MATLAB / Simulink, the feasibility and effectiveness of the proposed topology are verified.

10.1109/ipemc-ecceasia48364.2020.9368030

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Efficiency Promotion Strategy for Three-Level ANPC-DAB-Based DC-DC Converter with Wide-Range Multi-Objective Optimization Method

Jiachen Tian Fang Zhuo Jiayu Tang Haotian Deng Pengyu Gao

Because of the increasing demands of higher-voltage withstanding ability, higher modulation flexibility, lower cost for prototype establishment, wider zero-voltage-switching (ZVS) range adjustment ability and bidirectional power transmission ability, three-level active neutral-point-clamped dual active bridge (ANPC-DAB) converter is required to achieve goals which are mentioned. To establish efficient power transmission inside ANPC-DAB converter, double-side variable duty modulation (DVDM) strategy is also proposed. First, switching states and soft-switching conditions of ANPC half-bridge circuit are discussed minutely. The methods to realize ZVS turn-on of clamping switches and non-clamping switches are discussed similarly. At the same time, typical mode illustrations, power characteristics and current characteristics under different DVDM operation modes are demonstrated completely. Second, to achieve efficient power transfer inside ANPC-DAB converter, based on genetic algorithm, under certain transmission power, can achieve lowest peak current. Concurrently, based on complete differential algorithm, a integrated optimization method is created to reduce RMS current and extend ZVS region concurrently. Proposed DVDM strategy can achieve better efficiency performance by the comprehensive comparisons among existing modulation methods. At last, an ANPC-DAB prototype is designed, and proving effectiveness and correctness of proposed method.

10.1109/ic2ecs60824.2023.10493212

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A New Grating Thermography for Nondestructive Detection of Cracks in Coatings: Fundamental Principle

Coatings (2019)

Zhi Qu Weixu Zhang Zhichao Lv Feng Wang

It is important to detect the surface and/or subsurface cracks in coatings because the cracks usually indicate the failure of the system. Conventional detection techniques face two main challenges. One is the locating of the shallow cracks or defects in thin coatings. The other is the detection of the vertical cracks. Conventional infrared thermography can efficiently detect the horizontal cracks or defects. However, when locating the shallow cracks, it requires a high sampling frequency which is unrealistic for most of the infrared cameras. In terms of the vertical cracks, it is invalid since the propagation of its detecting signal is parallel to the cracks and does not interact with them. We introduce a new grating thermography method to overcome the two difficulties. In this paper we mainly illustrate its fundamental principle, which is validated by numerical simulations and a simple experiment. Overall, the principle analysis shows that grating thermography is highly effective in detecting cracks in coatings.

Thermography

SIGNAL (programming language)

10.3390/coatings9070411

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Citations (4)

Design and Evaluation of a High Performance Silicon Carbide MOSFET Driver

2022 IEEE 13th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) (2019)

Zuoyu Wei Kefan Yu Yuguo Li Hao Yi Fang Zhuo

In recent years, the technology of wide bandgap devices has developed rapidly and its commercialization also getting higher and higher. Silicon Carbide (SiC) Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFETs) are gradually replacing traditional silicon-based devices such as IGBTs in high-voltage, high-frequency, high-temperature applications due to their higher breakdown filed strength, lower switching losses, better thermal stability and thermal conductivity [1]. Of course, this also puts higher requirements and challenges on the drive design of SiC MOSFETs. The gate drivers for conventional silicon-based devices cannot be directly applied to SiC MOSFETs [2]. And the mature silicon carbide driver products on the market are few and expensive. Therefore, a general drive design for discrete SiC MOSFETs is proposed here, with high switching frequency, reliable fault isolation, fast fault detection and very small size. It also clarifies the key points and important parameter calculation criteria of the proposed drive circuit, then builds a double pulse test (DPT) platform to evaluate the performance of the gate driver board.

Gate driver

10.1109/pedg.2019.8807482

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Citations (2)

O-Band Fiber-to-Chip Edge Coupler for High NA Fiber Based on a CMOS Compatible SOI Platform

Optical Fiber Communication Conference (OFC) 2022 (2022)

Min Teng Hao Wu Chenlei Li Feng Wang Yinchao Du

A SiN edge coupler is experimentally demonstrated with a < 1.9 dB/facet loss over the whole O band for a 4μm MFD fiber. The power is further transformed into Si waveguide using a SiN-to-Si transition.

Waveguide

10.1364/ofc.2022.th2a.5

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Citations (2)

A quick surface heat flux estimation method for typical structures of high-speed aircrafts

Journal of Physics Conference Series (2022)

Long Wu Feng Wang Qi Wang Yiyu Han Zhengzhou Li

Abstract Surface heat flux estimation of high-speed aircrafts is an inverse problem and high system ill-posedness usually leading to instability and low accuracy. In this study, an efficient method is proposed to solve it stably. The heat flux identification equation is established based on the superposition principle. Tikhonov regularization method with the parameter determined by generalized cross validation is applied to reduce the sensitivity to measurement error. A calibration method is presented to correct the pulse sensitivity coefficient matrix so that the estimation method can be used for complex three-dimensional structures. Numerical studies demonstrate the efficiency and accuracy.

Regularization

Matrix (chemical analysis)

10.1088/1742-6596/2313/1/012004

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Design and analysis of a practical three-phase grid-connected photovoltaic inverter

International Conference on Electrical Machines and Systems (2011)

Wang Jian-guo Feng Wang Zhenke Pan Zhipeng Li Feng Xue

This paper has provided a practical design architecture of three-phase grid-connected photovoltaic power generation inverter, converting direct current from photovoltaic array to alternating current whose phase and amplitude are the same as the grid. Furthermore, the schemes are described separately from the hardware design, software design and protect-function design. Additionally, based on traditional arithmetic of maximum power point tracking (MPPT) and island detection, the developed solutions are introduced. In sum, the feasibility of this plan has been demonstrated, through trial and certification of related certification authority.

Three-phase

10.1109/icems.2011.6073761

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A Novel 26–43 GHz 4-bit Low Phase Error Variable Gain Amplifier in 65-nm SOI Technology

2021 IEEE Asia-Pacific Microwave Conference (APMC) (2024)

Yang Kuai Fei Yang Jiankang Li Jiawen Wang Feng Wang

Variable-gain amplifier

Bit (key)

10.1109/apmc60911.2024.10867302

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