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Analytical Model and Topology Optimization of Doubly-fed Induction Generator

CES Transactions on Electrical Machines and Systems 2024年第2期8卷 162-169页

作者： Lu Sun Haoyu Kang Jin Wang Zequan Li Jianjun Liu Yiming Ma Libing Zhou the State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China IEEE Dongfang Electric Machinery Co. LtdDongfang Electric CorporationDeyangChina CSG PGC Energy Storage Research Institute Southern Power Grid Energy Storage Co.LtdGuangzhou 510630China

As the core component of energy conversion for large wind turbines,the output performance of doubly-fed induction generators (DFIGs) plays a decisive role in the power quality of wind *** realize the fast and accurate design optimization of DFIGs,this paper proposes a novel hybriddriven surrogate-assisted optimization *** firstly establishes an accurate subdomain model of DFIGs to analytically predict performance ***,taking the inexpensive analytical dataset produced by the subdomain model as the source domain and the expensive finite element analysis dataset as the target domain,a high-precision surrogate model is trained in a transfer learning way and used for the subsequent multi-objective optimization *** on this model,taking the total harmonic distortion of electromotive force,cogging torque,and iron loss as objectives,and the slot and inner/outer diameters as parameters for optimizing the topology,achieve a rapid and accurate electromagnetic design for ***,experiments are carried out on a 3MW DFIG to validate the effectiveness of the proposed method.

关键词： Doubly-fed induction generators Accurate subdomain model Surrogate-assisted Transfer learning

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Branching Behavior of Continuous Leaders in Positive laboratory Long Air Discharges 37

Branching Behavior of Continuous Leaders in Positive Laborat...

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37th International Conference on Lightning Protection, ICLP 2024

作者： Guo, Lili Wang, He He, Junjia Zhang, Zhi State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan China

ISBN: (纸本)9783800764174

An essential inquiry in long air discharge pertains to why the discharge channel generates extensive branches. Here we have studied the extensive optical measurements of continuous leader channel branching. An exploration into branching behaviours shows a tendency for positive leaders to bifurcate or trifurcate, with a preference for bifurcation. The findings notably reveal a decrease in branching frequency as the channel approaches the ground electrode. Moreover, over 80% of branching events occurred within a ±30°angle range in front of the high-voltage electrode before breakdown. Statistical analysis of 280 bifurcations identifies three distinct branching types, with Type I being the most common and Type II the least frequent. Type II exhibits the narrowest branching angle range and lowest average, while in Type I branching, the deflection angle distributions of the left and right branches are essentially similar. Finally, the variation noticed in the partial velocity of the primary leader is notably affected by the development of sub-branches. That is a process driven by the elongation and branching of stems ahead of the already thermalized channel. Due to the complexity of branching behaviours and the limited research findings, our understanding of positive polarity leader analysis remains incomplete. Questions such as why the branching occurs, the patterns of branching, and the factors leading to branching behaviours still require further exploration. Regarding the above issue, the article statistically analysed the branching behaviour of hundreds of positive polarity long gap discharges conducted in this study, focusing on aspects such as the number of branches, the locations of branching occurrences, and the morphological characteristics of branching. Furthermore, we analysed the impact of branching on the velocity of the main discharge channel. © 2024 IEEE, © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Robotics

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Effect of Dark Periods on Subsequent Restrike in the Discontinuous Development of Positive Leader 8

Effect of Dark Periods on Subsequent Restrike in the Discont...

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8th Asia Conference on Power and Electrical engineering, ACPEE 2023

作者： Liu, Lei Liu, Yang Luo, Bing Zhong, Zheng Fan, Caijin Wang, Tingting He, Junjia Chen, Lixue China Southern Power Grid Electric Power Research Institute Guangzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350345520

Research on the physical mechanism of discontinuous development for the positive leader discharge is fundamental for optimizing the external insulation design of transmission lines. The effect of dark periods on the subsequent restrike, as a factor determining the discontinuous development feature, is investigated by means of a current measurement system with a wide dynamic range and direct optical imaging. With the increase of the voltage change rate, the duration of dark periods decreases, and the subsequent restrike is facilitated to occur and end the dark period. In addition, the discharge current and the amount of charge, representing the electrical characteristics, increase in the restrike process with the increase of these electrical parameters in the previous dark period. Two equations are suggested for fitting positive correlations of these parameters in the dark period and restrike processes. © 2023 IEEE.

关键词： Electric power transmission

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Analysis and Suppression Method of High-Frequency Oscillation in Parallel DC-DC Converter System

Analysis and Suppression Method of High-Frequency Oscillatio...

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IEEE Asia Power and Energy engineering Conference (APEEC)

作者： Tianyu Fang Xinchun Lin Juntian Wei Jiayan Zhang Chenyang Xie Jing Zhou Xiao Huo Zijie Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331517540

ISBN: (纸本)9798331517557

Parallel DC-DC converter system (PDCS) is widely employed in various scenarios due to its high controllability and redundancy. However, the high-frequency oscillation (HFO) in PDCS, which arises from the interactions among power electronic devices, poses a significant threat to system stability and urgently needs to be addressed. This paper investigates the mechanism of HFO using impedance-based method, develops an equivalent series RLC circuit in the high-frequency band to explain the cause of instability, and accordingly proposes an oscillation suppression strategy by reshaping the output impedance of the converter. Simulation tests are carried out to confirm the validity of the analysis and the proposed strategy.

关键词： Resistance Simulation Redundancy RLC circuits DC-DC power converters Hafnium oxide Stability analysis Circuit stability Impedance Oscillators

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Optimizing the current Central China 14th Five-Year power plan policy appropriately through detailed mathematical modeling 4

Optimizing the current Central China 14th Five-Year power pl...

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4th International Conference on Big Data Economy and Information Management, BDEIM 2023

作者： Xu, Xialing Liu, Tao Yu, Wenjuan Xiao, Dajun Liu, Chang Pan, Hongyu Central China Branch State Grid Corporation of China Wuhan430071 China Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9798400716669

The 14th Five-Year Plan is a crucial period for achieving emission peak, the government has formulated the 14th Five-Year Plan for the Central China power system. However, the current plan may face challenges of uncoordinated development between power generation and the grid, requiring mathematical modeling to analyze and optimize the current strategy. This paper proposes a model applied to the 14th Five-Year Plan for the Central China power system, optimizing current government policies, including the investment deployment of various power sources, the expansion of transmission lines and the optimal commissioning scale of pumped hydro storage. Our optimized plan can save an amortized annual investment and operating cost of 1 billion CNY. © 2023 ACM.

关键词： Central China Hourly operation simulation Power system capacity expansion plan The 14th Five-Year Plan

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Two-Degree-of- Freedom Sensorless Control Method Combining Extended Adaptive Full-Order Observer with Disturbance-Observer Based Controller for Induction Machine Drives 6

Two-Degree-of- Freedom Sensorless Control Method Combining E...

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6th International Conference on Energy Systems and Electrical Power, ICESEP 2024

作者： Deng, Jiangming Cao, Fen Cheng, Siwei Xu, Wei Ge, Jian Crrc Zhuzhou Locomotive CO Ltd. Zhuzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan China Institute of Electrical Engineering Chinese Academy of Science Beijing China

ISBN: (纸本)9798350353563

In sensorless control strategies for induction machines (IM), achieving high dynamic performance in speed control and observation is crucial. However, the sensorless control approach often struggles to provide satisfactory dynamic responses to varying speed references and load disturbances due to the extra dynamics between actual and observed speeds. To address this challenge, a systematic design method for the speed controller and observer in this paper. The proposed method combines the extended adaptive full-order observer (EAFO) with the disturbance observer-based controller (DOBC). As a result, the proposed method achieves a decoupled two-degree-of-freedom (2DOF) characteristic, enhancing speed tracking and load disturbance rejection abilities. Numerous simulation and experimental results demonstrate the superiority of the proposed algorithm. © 2024 IEEE.

关键词： Disturbance rejection

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Rotor Winding Short Circuit Fault Protection Method of Variable Speed Pumped Storage Unit Based on Stator and Rotor Side Differential Current 17th

Rotor Winding Short Circuit Fault Protection Method of Varia...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： He, Rufei Qiao, Jian Wang, Wenhui Yin, Xianggen Peng, Yumin Zhang, Hao CSG PGC Power Storage Research Institute Guangzhou510950 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819904501

The rotor winding structure of variable speed pumping storage unit is different from that of traditional fixed speed unit, so the types and characteristics of short circuit faults of the rotor windings of the two types of units are obviously different. Therefore, a fault protection method for rotor windings of variable speed pumping storage unit is proposed based on the differential current of different frequency on fixed rotor side. Firstly, the feasibility of differential protection using different frequency current of stator and rotor is analyzed. Then, the measured current at the stator end and the rotor slip ring were used to extract the measured current to identify the peak value, angular frequency and phase Angle parameters of the fixed and rotor-side current online, and the rotor-side current was converted in real time based on the calculation results of the identification. The protection action current and braking current are calculated by using the converted current and stator side measurement current, which constitute the differential protection criterion. Finally, an actual variable speed pumping storage unit is taken as an example to establish its mathematical simulation model, and the simulation results verify the effectiveness of the proposed method. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Stators

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Location of the space stem in long negative laboratory sparks 12

Location of the space stem in long negative laboratory spark...

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12th Asia-Pacific International Conference on Lightning, APL 2023

作者： Zhao, Xiangen Du, Yaping Guo, Lili Liu, Yang He, Junjia The Hong Kong Polytechnic University Department of Building Environment and Energy Engineering Hong Kong Hong Kong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781665456852

It is well known that the negative leader in the air develops in a stepwise manner, with each step originating from a space stem. However, the formation mechanism of a space stem remains unknown, leading to a blockage in the study on negative leader discharge. One of the main reasons is the lack of observations of space stems. For this reason, and as a continuation of our work, this paper focuses on the initiation location of the space stems. We have designed experimental conditions to enable space stem observation using a high-speed camera. Through processing the experimental images, it is found that the location where the space stems start to be formed may be located at the boundary of the previous corona streamer discharge, or inside the pre-corona streamer region, but at the edge of the intense discharge area. These findings may help to further Figure out the formation mechanism of a space stem in long negative sparks in the air. © 2023 IEEE.

关键词： Location

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MIDC system voltage support capability evaluation index with renewable energy sources

MIDC system voltage support capability evaluation index with...

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2024 International Conference on Energy technology and Electrical Power, ETEP 2024

作者： Huang, Qiyuan Wu, Jinbo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Hunan Electric Power Co. Ltd. Power Research Institute China

ISBN: (纸本)9781510690400

Renewable energy sources (RES) connected to the receiving end of the multi-infeed HVDC (MIDC) system will affect the node voltage support capability, which in turn affects the voltage stability of the power grid. To reasonably evaluate the voltage support capability of RES integrated MIDC systems, firstly, the structural characteristics of the MIDC system and the amplitude and phase characteristics of different types of RES are analyzed. Secondly, based on the traditional short circuit ratio index combined with the RES amplitude and phase characteristics, the multi-infeed transient short circuit ratio (MITSCR) is defined, and the method of analyzing the voltage support capability of MIDC system is proposed. Finally, time-domain simulation analysis is carried out using PSACD/EMTDC, and the results show that the MITSCR can effectively characterize the node voltage support capability. © 2025 SPIE.

关键词： Solar fuels

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Summary of the 10th Conference on Magnetically Confined Fusion Theory and Simulation(CMCFTS)

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Plasma Science and technology 2023年第8期25卷 1-11页

作者：王志斌仇志勇王璐陈伟 Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082People's Republic of China Institute for Fusion Theory and Simulation Zhejiang UniversityHangzhou 310027People's Republic of China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Southwestern Institute of Physics Chengdu 610041People's Republic of China

This paper gives a summary of the organization and the presentations delivered at the 10th Conference on Magnetically Confined Fusion Theory and Simulation(CMCFTS)held in Zhuhai,China,from 28th to 31st October *** conference focused on the latest progress in the research of the magnetic confined fusion plasma theory and simulations,as well as the largescale numerical simulation techniques developed in recent *** conference is held both online and offline,with about 110 domestic participants from 18 institutes participating in the live conference,and the statistical data from the live broadcast platform indicated that the online conference attracted over 20000 views per day.A summary of the conference is given,and the history of the CMCFTS is presented.A brief introduction to the poster section is also included in this paper.

关键词： CMCFTS magnetically confined fusion theory simulation conference report

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