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International Conference on Wireless Power Transfer, ICWPT 2022

作者： Tang, Mengyang Xue, Pengfei Cheng, Zhangge Yong, Tao Key Laboratory of Smart Grid and Intelligent Control of Nanchong Southwest Petroleum University Nanchong637001 China Taiyuan Power Supply Company State Grid Taiyuan Electric Power Co. Ltd. Taiyuan030012 China Chongqing Sound and Optoelectronics Co. Ltd. Chongqing400000 China

ISBN: (纸本)9789819906307

GaN devices have attracted extensive attention due to their excellent characteristics of high electron mobility. GaN devices can greatly reduce switching loss in hard switching circuits. In order to achieve high efficiency and high power density, GaN devices are applied to totem pole bridgeless PFC topology, the mathematical model of power circuit is established, and the optimal control strategy is proposed based on this model. The change of inductance value caused by different input and output conditions leads to the change of cutoff frequency of the system, which affects the performance of the system. In this paper, a piecewise PI compensation optimization control strategy is proposed. To solve the problem of high total harmonic distortion rate and zero crossing distortion, a duty cycle feedforward control method is introduced. In order to reduce THD, the effect of current loop bandwidth on current harmonics was analyzed qualitatively and optimization strategies were proposed. Finally, the parameters of the control system and the main circuit are designed according to the requirements, and a 1.5kW prototype is developed for experiment, which verifies the correctness of the theoretical analysis and the effectiveness of the optimized control strategy. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Gallium nitride

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Research on the grabcut image segmentation method based on superpixel

Research on the grabcut image segmentation method based on s...

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International Conference on Intelligent System and Knowledge Engineering, ISKE

作者： Yang Liu Ningning Zhou Guofang Huang School of Computer Nanjing University of Posts and Telecommunications Nanjing China Nanjing University of Posts and Telecommunications Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China

In order to overcome the Excessive time complexity of bad quality when the disposing the picture whose foreground is similar to background of grabcut method, a grabcut method based on superpixel is proposed in this paper. This method, firstly, extracting the superpixel block of the picture. And then, split the picture which is extracted. The experimental results show that this method is effective to improve the speed of segmentation. What's more, this method can solve the problem of bad quality when the disposing the image whose foreground is similar to background in a certain extent. This paper has certain advantage in disposing those image whose size are too big and foreground is similar to background.

关键词： Image segmentation Image color analysis Algorithm design and analysis Clustering algorithms Feature extraction Partitioning algorithms Time complexity

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Research on Low Order Harmonic Suppression of Motor Drive System under Two-Phase Rotating Coordinate Frame 17th

Research on Low Order Harmonic Suppression of Motor Drive Sy...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Yong, Tao Liu, Jing Li, Wenxiao Yang, Guanjian Tang, Mengyang Miao, Yiru Key Laboratory of Smart Grid and Intelligent Control of Nanchong Southwest Petroleum University Nanchong637001 China State Grid Jiangsu Electric Power Co. LTD. Extra-High Voltage Branch Company Nanjing211002 China College of Electrical and Information Engineering in Hunan University Changsha410082 China State Grid Sichuan Electric Power Company Chengdu610041 China

ISBN: (纸本)9789819904075

Due to nonlinear factors such as dead-time and tube voltage drop, low-order harmonics will be injected into the output voltage of the inverter, resulting in fifth and seventh harmonic distortion of stator current and increasing torque ripple. At the same time, the natural frequency of inductor motor used in electrical vehicle is low, when the motor runs at medium and high speed, the low harmonic frequency of the current coincides with the natural frequency of the motor, resulting in resonance. To solve the above problems, firstly, the simulation and test method of the natural frequency of the IM is studied, and the natural frequency range of the IM is determined. Then, based on the analysis of the harmonic distortion characteristics caused by dead-time and tube voltage drop, a sixth harmonic controller is added to the current inner loop of the vector control system after rotor flux orientation (d-q coordinate), and the design method of the controller parameters is studied. Finally, the simulation model is established, which shows that the theoretical analysis and the proposed harmonic control method are correct and feasible. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Harmonic distortion

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key Technologies of IoT Intelligent Sensing Terminal for smart Energy

Key Technologies of IoT Intelligent Sensing Terminal for Sma...

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2022 IEEE International Conference on High Voltage Engineering and Applications, ICHVE 2022

作者： Liu, Siyang Mao, Yuxing Long, Yunfeng Pan, Jianyu Jiang, Tianyan Cao, Min State Key Laboratory of Power Equipment & System Security and New Technology School of Electrical Engineering Chongqing University Chongqing China Yunnan Key Laboratory of Green Energy Electric Power Measurement Digitalization Control and Protection Electric Power Research Instute Yunnan Power Grid Co. Ltd. Yunnan Kunming China

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407502

To build a smart energy system, we must first deploy a fully aware terminal layer to connect all energy things through perception. This paper proposes key technologies of IoT intelligent sensing terminal for smart energy. Firstly, smart energy Internet of things function is given to analyze the architecture for smart energy Internet of things. Analysis of Internet of Things terminal ecosystem is located. Finally, the key technologies including resource unified modeling, hardware and software system of Internet of things terminal are proposed. Customized design of intelligent sensing terminal is given to manufacture intelligent sensing terminal for different application scenarios of smart energy. © 2022 IEEE.

关键词： Internet of things

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Thermal simulation optimization of DC charger based on ANSYS Icepak

Thermal simulation optimization of DC charger based on ANSYS...

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Prognostics and System Health Management Conference (PHM-Qingdao)

作者： Yu Wang Feiyu Zhou Tan Wen Yan Su Li Yuan Ke Wang State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China Nanjing University of Aeronautics and Astronautics College of Civil Aviation Nanjing China State Grid Electric Power Research Institute Nanjing China

As one of the most important charging facilities for electric vehicles, DC chargers provide power supplements for electric *** the continuous development of DC chargers, the power density of their internal functional modules is also increasing. It is urgent to choose a reasonable heat dissipation method to reduce the overall temperature rise inside the DC charger and ensure its safe operation. In this paper, the 80kW DC charger is taken as the research object, and based on ANSYS Icepak thermal simulation software, the internal temperature field and fluid field of the DC charger are simulated and analyzed, and the design scheme of the DC charger is optimized by studying the heat dissipation system. Finally, the optimization scheme of the air duct structure of the system is obtained by adjusting the position of the heat dissipation fan.

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Analysis of Wide-Band Oscillation Characteristics of Rudong Offshore Wind Farm Connected to the grid Through VSC-Based DC Transmission System 7

Analysis of Wide-Band Oscillation Characteristics of Rudong ...

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7th Asia Conference on Power and Electrical Engineering, ACPEE 2022

作者： Chen, Zhitong Li, Guojie Kong, Xiangping Zhang, Chi Bin, Zijun Xu, Jin Key Laboratory of Control of Power Transmission and Conversion Shanghai Jiao Tong University Shanghai China Relay Protection Automation and Communication Technology Electric Power Research Institute State Grid Jiangsu Electric Power Co. Ltd. Nanjing China

ISBN: (纸本)9781665418195

The stability of Rudong offshore wind farm through a voltage-source converter (VSC) based DC transmission system was studied in the paper. Firstly, the electrical topology the wind farm with the DC transmission system was set up. Secondly, the control system of direct-drive wind turbines and the VSC of the DC transmission system was modeled, and then the dynamic mathematical model of the entire system was obtained. The oscillation modes of the system were analyzed by eigenvalues analysis. The state variables and influence parameters related to oscillations were obtained according to the participation factor analysis. The parameters of wind power systems integrated into the grid as well as the VSC control of were deeply studied, and the effect of parameter change on system constancy was analyzed. © 2022 IEEE.

关键词： Offshore wind farms

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Fundamental Characteristics and Four-tier Residential Customer Energy Consumption Behavior Model

Fundamental Characteristics and Four-tier Residential Custom...

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smart grids and Energy Systems (SGES), International Conference on

作者： Jianmin Zhang Yusheng Xue Fushuan Wen Ping Luo Junteng Luo Yukuan Wang School of Automation Hangzhou Dianzi University Hangzhou China State Key Laboratory on Smart Grid Protection and Control Nanjing China College of Electrical Engineering Zhejiang University Hangzhou China

ISBN: (数字)9781728185507

The big obstacle for residential energy transition is the lack of a consumption behavior model. At first, special characteristics of residential customer are discussed, including their fundamental purpose of energy use and attitudes against constraints and energy prices, as well as derived demand characteristics on appliance in energy consumption, etc. Then, a four-tier energy consumption behavior model of residential customers is developed with “virtual appliance” being generalized into three time scales as current, near future, future, and the behavior evolution process is sectionalized into cognition, consciousness, demand and behavior. The methodology and technology to implement the four-tier model in real applications will be dominated by the emerging cyber physical social system in energy, and a customized questionnaire survey system is demanded to investigate the consumption behaviors of residential customers.

关键词： Economics Energy consumption Home appliances Production Cognition smart grids Object recognition

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Extended Engel-Kollat-Blackwell Consumption Behavior Model for Residential Customers

Extended Engel-Kollat-Blackwell Consumption Behavior Model f...

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smart grids and Energy Systems (SGES), International Conference on

作者： Jianmin Zhang Yusheng Xue Fushuan Wen Dongming Liu Ping Luo Yang Li School of Automation Hangzhou Dianzi University Hangzhou China State Key Laboratory on Smart Grid Protection and Control Nanjing China College of Electrical Engineering Zhejiang University Hangzhou China

ISBN: (数字)9781728185507

ISBN: (纸本)9781665448505

Modeling the consumption behavior of residential customers is very important for investigating their potentials to participate in demand side management and retail market competition. The Engel-Kollat-Blackwell (EKB) model is well-known in consumption behavior modeling, however it is not directly applicable for modeling residential energy consumption, as explored in this paper. An extension of the EKB model is next developed to explain the behaviors of residential energy consumption, including derived demand characteristics, habit change process, behavior change process, internal feedback, external stimulus factors, and environment factors, and employed to implement a green information system so as to guide the residents in energy transition. A questionnaire survey information APP system on WeChat is implemented and the survey results briefly analyzed.

关键词： Energy consumption Social networking (online) Green buildings Message service Data models smart grids Information systems

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Advanced control strategy of SVC based on artificial immune algorithm

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Journal of Computational Information Systems 2015年第6期11卷 1965-1972页

作者： Chen, Saisai Li, Kejun Jing, Ping Zha, Guoliang Tian, Xin Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China Smart Grid Research Institute of State-Grid Changping District Beijing China

For the conventional Static Var Compensator (SVC), there is a contradiction between the response time and system stability. An advanced control strategy is proposed in this paper. Improved Proportional Integral (PI) controller and Artificial Immune Algorithm are adopted in SVC control system, with the response speed of SVC as objective function of optimization. Meanwhile, a non-linear link is added to ensure the stability of the system. The non-linear link is proved that it can significantly improve the stability of the nonlinear system. Simulation results show that the new SVC control strategy can not only track the set voltage value of SVC quickly, but also comprehensively compensate for reactive power and three-phase imbalance. Copyright © 2015 Binary Information Press.

关键词： Static Var compensators

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A Coordinated MMC control Strategy of Integrated Photovoltaic/Battery System

A Coordinated MMC Control Strategy of Integrated Photovoltai...

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IEEE International Conference on Energy Internet (ICEI)

作者： Yuexi Yang Xiao Zhou Sichao Wang Chunpeng Li Junwei Huang Wenzheng Xu State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co.Ltd. Beijing China Fujian Key Laboratory of Protection and Operation Control for Smart Grid State Grid Fujian Electric Power Research Institute. Fuzhou China National Research Center for Active Distribution Network Technology Beijing Jiaotong University. Beijing China

The grid-connecting control and maximum power point tracking control of photovoltaic inverters have long been the research focus in the field of solar power generation. In this paper, a new coordinated modular multilevel converter (MMC) control strategy based on virtual synchronization and MPPT is proposed for grid-connected inverters in the PV/Battery system. The proposed strategy realizes frequency and voltage droop control with the synchro's inertia and damping characteristics, and improves the power angle stability as well as system voltage stability. Simulation results in MATLAB/Simulink verifies the feasibility and effectiveness of the proposed control strategy.

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