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International Conference on Automation and Computing (ICAC)

作者： Weichen Yang Shihong Miao Yaowang Li Binxin Yin Junyao Liu State key laboratory of advanced electromagnetic engineering and technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781538648919

A source-load coordination scheduling strategy is proposed in this paper to reduce the system operation cost and wind power curtailment. Firstly, the scheduling model of the power system with wind power is established. To solve the scheduling problem, the binary particle swarm optimization (BPSO) algorithm is used to determine the ON/OFF states of generations; the continuous particle swarm optimization (CPSO) algorithm is used to deal with the economic load dispatch problem; and the constraints are properly handled by adjustment methods. Secondly, in order to maximize the wind power accommodation rate, the power system adopts the time-of-use price program, an optimization model of electricity price is established based on price elasticity matrix. The CPSO algorithm and parallel computing are used to optimize the time-of-use price schedules. According to the results of the case study, the demand response program plays an important role in reducing the peak-valley difference, wind power curtailment, and system operating cost. The proposed scheduling strategy and algorithm are proven to have a good optimization performance, calculation speed and stability.

关键词： Wind power generation Spinning Optimal scheduling Power system stability Scheduling

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Comparative Analysis of High Torque Density PM Machines

Comparative Analysis of High Torque Density PM Machines

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International Conference on Electrical Machines

作者： Kangfu Xie Dawei Li Ronghai Qu Yuan Pan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

High torque density PM machines have attracted more and more attention recently, especially for the low-speed, high-torque application. In this paper, three high torque density PM machines are analyzed and compared, namely 12-slot/10-pole SPM, 16-pole transverse flux PM and 12-slot/22-pole flux modulation PM machines, with the specification of 30 kNm/m~3. To reveal the nature of high torque density of different topologies, saturation effect is neglected. Based on the Maxwell stress tensor (MST) method, the radial and tangential flux density and force distribution along the airgap are illustrated. The torque contribution from different field harmonics are also compared. It's shown that torque density of PM machines can be enlarged further by improving the tangential flux density, decreasing the phase difference between radial and tangential flux density, and integrating more working harmonics into one PM machine.

关键词： Flux density Maxwell stress tensor method PM machine Torque density

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Phase transition to synchronization in generalized Kuramoto model with low-pass filter

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Physical Review E 2019年第1期100卷 012209-012209页

作者： Wei Zou Meng Zhan Jürgen Kurths School of Mathematical Sciences South China Normal University Guangzhou 510631 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China Potsdam Institute for Climate Impact Research Telegraphenberg Potsdam D-14415 Germany Institute of Physics Humboldt University Berlin Berlin D-12489 Germany Saratov State University Saratov 4410012 Russia

A second-order continuous synchronization has been well documented for the classic Kuramoto model. Here we generalize the classic Kuramoto model by incorporating a low-pass filter (LPF) in the coupling, which serves as a simple form of indirect coupling through a common external dynamic environment. We uncover that a first-order explosive synchronization turns out to be a very generic phenomenon in this generalized Kuramoto model with LPF. We establish theoretical results by providing a rigorous analytical treatment, which is validated by conducting extensive numerical simulations. Our study provides a new root for the emergence of first-order explosive synchronization, which could substantially deepen the understanding of the underlying mechanism of a first-order phase transition towards synchronization in coupled dynamical networks.

关键词： Coupled oscillators Synchronization transition

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Influence of Electrohydraulic Discharge on Its Application in Oil Well Stimulation

Influence of Electrohydraulic Discharge on Its Application i...

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IEEE Symposium Power Modulator

作者： Siwei Liu Yi Liu Hua Li Qin Zhang Fuchang Lin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science & Technology Wuhan China

Due to the inefficiency, high price, and environmental unsafety of the conventional recovery methods, the production decrease of the oil well is an increasingly serious problem all over the world. Therefore, the need for enhanced oil recovery (EOR) techniques to recover a higher proportion of the oil has become imperative. The electrohydraulic shock waves with steep fronts and high intensity are utilized to generate micro-cracks near the oil well and enhance the permeability of the reservoir. A novel enhanced oil recovery technology based on repetitive electrohydraulic shock waves is presented in this paper. The influence of discharge modes and hydrostatic pressure on its application in oil well stimulation is studied. The paper presents experimental results and optical observation for the characteristics and the development of the streamers. The on-site experiment is carried out to evaluate the potential of the proposed method and the developed equipment. Results point out that the design of the prototype should be dependent from the hydrostatic pressure and confirms the potential of this technology to be a promising EOR method in low permeability reservoir.

关键词： Oils Shock waves Discharges (electric) Electrohydraulics Plasmas Liquids

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A Method for Multi-VSC Interaction Analysis Based on Current Excitation and Voltage Response in Current Control Timescale

A Method for Multi-VSC Interaction Analysis Based on Current...

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International Conference on Renewable Power Generation

作者： Sheng Li Meiqing Zhang Xiaoming Yuan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

High frequency oscillations caused by the voltage source converters (VSCs) have been increasingly emerged in the VSC-dominated power systems. However, most studies concentrate on the single VSC scenarios and lack enough cognitions of the interactions among multi-VSC. Hence, this paper will propose a method to study the interactions among multi-VSC. First, VSC will be uniformly modeled as the current excitation and the voltage response. Then, the interactions of the other VSCs on the studied VSC can be depicted and summarized as the current variations of the studied VSC induced by the voltage perturbations of the other VSCs. By converting the interactions of the other VSCs into the studied VSC, the multi-VSC system can be equivalent into the single VSC system. Hence, by studying the self-effect paths and the interacting-effect paths in the equivalent single VSC system, it is possible to study the interactions of the other VSCs on the stability of the studied VSC. Eventually, this method is illustrated in a two-VSC system and time domain simulations validate the correctness of the analyses.

关键词： Interaction Voltage source converter (VSC) Multi-VSC Current control timescale

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Event-triggered robust load frequency control of a multi-area power system including wind farms

Event-triggered robust load frequency control of a multi-are...

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第37届中国控制会议

作者： Chao Yang Wei Yao Jinyu Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and Technology

Owing to the highly randomness and intermittent nature of wind power generation, the smart grid raises a challenge to maintain real power balances and frequency control in a multi-area power system including wind farms. This paper analyzes the stability of the load frequency control scheme of a multi-area power system including wind farms. To reduce the communication burdens in open communication infrastructure and impact of the extra disturbance, an event-triggered robust load frequency control scheme is proposed for the multi-area power system. Through theoretical proof and simulation test, the effectiveness of the proposed method has been validated in load frequency control of multi-area power systems.

关键词： wind farm load frequency control event-triggered robust controller multi-area power system

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Dynamic characteristic and interaction analysis of synchronous generator based on amplitude–phase motion equation

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The Journal of engineering 2018年第13期2017卷 714-718页

作者： Luhan Huang Xiaoming Yuan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 People's Republic of China

With the increasing penetration of power electronic devices, the dynamic characteristics of devices and power system change. Thus, new models and analytical methods applied to stability analysis of power electronics dominated power system need to be put forward. This study takes synchronous generator as an example. The method of device modelling based on amplitude–phase motion equation is introduced, and the idea of interaction analysis based on concepts of self-stabilising and en-stabilising is proposed.

关键词： synchronous generators power electronics stability analytical methods stability analysis power system change power electronic devices amplitude–phase motion equation interaction analysis synchronous generator dynamic characteristic

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Transforming heat transfer with thermal metamaterials and devices

arXiv

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arXiv 2020年

作者： Li, Ying Li, Wei Han, Tiancheng Zheng, Xu Li, Jiaxin Li, Baowen Fan, Shanhui Qiu, Cheng-Wei Department of Electrical and Computer Engineering National University of Singapore Singapore117583 Singapore Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Zhejiang University Hangzhou310027 China Department of Electrical Engineering Ginzton Laboratory Stanford University StanfordCA94305 United States National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China Chengdu610054 China Department of Physics University of Colorado BoulderCO80309 United States School of Mechatronics Engineering Harbin Institute of Technology Harbin150001 China Paul M. Rady Department of Mechanical Engineering University of Colorado BoulderCO80309 United States

| The demand for sophisticated tools and approaches in heat management and control has triggered fast development of emerging fields including conductive thermal metamaterials, nanophononics, far-field and near-field radiative thermal management, etc. In this review, we cast a unified perspective on the control of heat transfer, based on which the related studies can be considered as complementary paradigms toward manipulating physical parameters and realizing unprecedented phenomena in heat transfer using artificial structures, such as thermal conductivity in heat conduction, thermal emissivity in radiation, and properties related to multi-physical effects. The review is divided into three parts that focus on the three main categories of heat flow control, respectively. Thermal conduction and radiation are emphasized in the first and second parts at both macro- and micro-scale. The third part discusses the efforts to actively introduce heat sources or tune the material parameters with multi-physical effects in both conduction and radiation, including works using thermal convection. We conclude the review with challenges in this research topic and new possibilities about topological thermal effects, heat waves, and quantum thermal effects. Copyright © 2020, The Authors. All rights reserved.

关键词： Metamaterials

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Outside Cover Picture: Plasma Process. Polym. 9/2020

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Plasma Processes and Polymers 2020年第9期17卷

作者： Chen Lu Jinchi Dai Nianguo Dong Yu Zhu Zilan Xiong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China Department of Cardiovascular Surgery Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan Hubei China

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A Comprehensive Analysis of Voltage to Ground of Floating Submodule for MMC

A Comprehensive Analysis of Voltage to Ground of Floating Su...

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European Conference on Power Electronics and Applications

作者： Jianan Chen Zhihao Fang Qiang Li Dong Jiang Jinkun Ke Xinying Wang Wei Sun State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology 1037 Luoyu Road Wuhan China SGCC Park North Zone of Future Science City GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE CO. LTD Beiqijia Changping District Beijing China

Modular multilevel converter (MMC), which are widely used in VSC-HVDC transmission systems, is usually composed of numerous submodules (SMs) whose voltage are floating in respect to ground. During the commutation transient, high dv/dt for SMs will cause common-mode current to flow into the ground through parasitic capacitors, resulting in conducted EMI. Due to the large number of SMs for MMC, the SMs at different positions have different voltage to the ground, and the voltage jump to the ground of the SMs are also affected by the operating conditions. Therefore, this paper comprehensively analysis the change rules of voltage to ground for SMs under different operating conditions and identify the sensitive SMs with respect to dv/dt. The relevant simulation results can verify the analysis results for the position of the sensitive SMs and the voltage jump rules for SMs under different operating conditions. Furthermore, a double-pulse test of SM is implemented to verify that the common-mode current is conducted when the SM is switching.

关键词： Bridge circuits electromagnetic interference Capacitors Switches Electric potential Europe Insulated gate bipolar transistors

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