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检索条件"机构=1State Key Laboratory of Advanced Electromagnetic Engineering and Technology"

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High Efficiency Hybrid Synchronous Motor Design with Loss Analysis for a Two-Speed e-Powertrain System in Electric Vehicle

High Efficiency Hybrid Synchronous Motor Design with Loss An...

引用

IEEE International Conference on Electric Machines and Drives (IEMDC)

作者： Shun Feng Ronghai Qu School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

With high efficiency and high flux-weakening capability, hybrid synchronous motor (HSM) is a competitive alternative as a cost-effective solution for traction applications. This paper presents a cascaded and systematic method to define specifications of target motor and design a high efficiency 172 kW, 18000 rpm HSM for a two-speed e-Powertrain system. Vehicle-level specifications and gear ratio combinations are taken into consideration to determine motor requirements. Four concept rotor typologies are investigated to obtain efficiency maps for comparisons in simulation models. Detailed loss analyses are done at both base speed and maximum speed for a selected HSM. 0.2 mm stator lamination and 4 segmented magnets in each magnet slot have been applied to further improve motor maximum efficiency. Performance tests are completed in the dyne bay to show that 97.5% maximum efficiency is achieved.

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Efficiency Estimates of Integrated Two-Speed e-Powertrain System under WLTP Driving Cycle for Electric Vehicle

Efficiency Estimates of Integrated Two-Speed e-Powertrain Sy...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Shun Feng Ronghai Qu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

Efficiency is always one of key metrics for electric powertrain system to make the most of battery stored energy and boost electric vehicle’s range. This paper presents a systematic method to estimate efficiency capability for an integrated two-speed e-Powertrain system. Overall system is modelled in MATLAB/Simulink. Inverter power, voltage and current requirements are defined from system specifications. Inverter losses, efficiencies and thermal conditions are investigated at switching frequencies of SkHz and 12kHz. With both traction motor and gearbox efficiency maps, 93.2% system peak efficiency and 90.2% Worldwide Harmonized Light Vehicle Test Procedure (WLTP) Class 3b driving cycle efficiency are obtained to verify that design targets are met in simulations. A prototype is built to validate system efficiency performance in the thermal chamber during tests.

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Nonlinear Multiscale Modeling of Multi-Machine Power Systems Integrated with Photovoltaics

Nonlinear Multiscale Modeling of Multi-Machine Power Systems...

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PELS Students and Young Professionals Symposium (SYPS), IEEE

作者： Jiaqi Wu Miao Han Meng Zhan School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Large-scale photovoltaics (PVs) connected to the power grid through power electronic equipment have greatly changed the dynamics of the traditional power systems dominated by synchronous generators (SGs), bringing significant challenges to modeling and analysis of modern power systems. In this paper, a nonlinear model of multi-machine power systems integrated with PVs is established to reveal the multi-timescale transient synchronization characteristics using the singular perturbation technique. The fast subsystem containing the dynamics of the DC voltage control, terminal voltage control, and phase-locked loop, and the slow subsystem containing the dynamics of the rotor swing can effectively reflect the dynamics of multi-machine power systems integrated with PVs within the electromagnetic and electromechanical timescales, respectively. The proposed model provides a clearer physical picture of dynamics in the multi-machine power systems integrated with PVs within the electromagnetic and electromechanical timescales, and serves as the foundational model for further stability analysis. Finally, simulation results verify the validity of the proposed model.

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A Novel Variable Impedance Design Concept of PM Fault Tolerant Machine

A Novel Variable Impedance Design Concept of PM Fault Tolera...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Runyu Wang Dawei Li Xinggang Fan Ronghai Qu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

A novel variable impedance fault tolerant design concept is proposed in this paper for high reliable PM machines. The special fault tolerant ring structure realizes the automatic transformation of the machine from low impedance in healthy operation to ultra-high impedance in fault operation, which effectively suppresses the short-circuit current. First, the design guidelines for fault tolerant ring and the fault tolerance mechanism of variable impedance are introduced. Subsequently, two variable impedance machine topologies with separated and integrated fault tolerant rings are investigated. Finally, the prototypes are fabricated and the experimental results show that the proposed variable impedance topology has a turn-to-turn short-circuit current suppression capability that far exceeds that of the conventional fault tolerant topology.

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CoFMD-BiLSTM: A Wind and Photovoltaic Power Prediction Method Based on Feature Mode Decomposition and Cooperative Learning Strategy

CoFMD-BiLSTM: A Wind and Photovoltaic Power Prediction Metho...

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2024 China Automation Congress, CAC 2024

作者： Ding, Xinzhi Li, Dayi Huang, Wei Chen, Yiping State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Co. Kunming650217 China Yunnan Power Grid Co. Ltd. Kunming650011 China Research Institute of China Southern Power Grid Beijing102209 China

ISBN: (纸本)9798350368604

With the increasing penetration of new energy sources such as wind and solar, accurate source-side power forecasting helps power system dispatchers to obtain new energy pre-output plans and improve the power system's new energy consumption capacity through the coordination of multiple power generation resources. The wind and photovoltaic power data are characterized by large fluctuations, strong nonlinearity, instability, and strong time dependence, etc. Through "Decomposition-Prediction", the original sequence is decomposed into a number of sub-sequences, which reduces the volatility and randomness of the original sequence, and has been widely used in wind and photovoltaic power prediction. In order to solve the problem that traditional decomposition algorithms have insufficient decomposition capability to extract data features in a targeted and effective way, we propose a wind and photovoltaic power prediction method based on Feature Mode Decomposition and Cooperative Learning Strategy: the CoFMD-BiLSTM model. A novel emerging decomposition algorithm, Feature Mode Decomposition (FMD), originally applied in fault detection, is introduced. By designing a Cooperative Learning Strategy to learn and fit the decomposition sequence information obtained from the FMD decomposition covering different features, which is fed into the BiLSTM model to obtain the wind and light power predictions. The actual operation data of Sotavento Galicia (sg) wind farm in Spain and TuoZhuo photovoltaic farm in Yunnan, China are used. Compared with the two models, VMD-BiLSTM and BiLSTM, the validation results show that the wind and solar power prediction method based on the CoFMD-BiLSTM model can effectively improve the accuracy of wind and solar power prediction. © 2024 IEEE.

关键词： BiLSTM Cooperative Learning Strategy FMD Wind and Photovoltaic power forecasting

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Optimizing Layout of Video Surveillance for Substation Monitoring 10th

Optimizing Layout of Video Surveillance for Substation Monit...

引用

10th International Conference on Computer engineering and Networks, CENet 2020

作者： Lu, Yiqi Zhong, Yang Hu, Chuye Wang, Shaorong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789811584619

An automated video surveillance system plays a vital role in unattended substations. To minimize the camera cost and maximize the monitoring coverage of the substation, efficiently placing the camera is critical. Two optimization models are developed in this paper to satisfy two kinds of requirements of unattended substations monitoring in practice: minimizing cost with full coverage, optimizing coverage with a fixed budget. The second model is mainly proposed for the first time to get the minimum monitoring fitness function as the optimization goal. By introducing piecewise functions in the second model, it meets different monitor-ing requirements in different regions of substations and reduces the over-lapping monitoring area efficiently. The two models are tested using a genetic algorithm to get the optimal layout of the cameras. The validity and practicability of the two models of monitoring in unattended substations are verified by simulation. The results suggest that this model-based optimization approach to cameras layout can be used to improve the efficiency of substation video surveillance systems. © 2021, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Monitoring

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A Review on the Control Strategies for Differential Boost Inverter

A Review on the Control Strategies for Differential Boost In...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Mengyuan Li Jin Wang Hu Wang Youlun Dai Libing Zhou State Key Laboratory of Advanced Electromagnetic Engineering and Technology (School of Electrical and Electronic Engineering) Huazhong University of Science and Technology Wuhan China

The differential boost inverter (DBI) has gained a great deal of interest in academia due to its advantages. Compared with conventional cascaded topology composed of a DC-DC boost circuit and a voltage source inverter, DBI needs only one-level topology to achieve boost inverter, thus has higher efficiency and lower cost. The three-phase DBI can be applied to motor drives and grid connection. Based on analyzing the structure and operating principle of three-phase DBI, this paper presents an elaborate and in-depth review of typical control strategies for three-phase DBI, including their basic principles, key features, exiting issues, and relevant suggestions, and finally reports the development tendency of the control strategies.

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A Fast Transient Control Method for Dual-Bridge Series Resonant Converter

A Fast Transient Control Method for Dual-Bridge Series Reson...

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Power Electronics and Application Symposium (PEAS), IEEE International

作者： Zhuolan Li Yu Zhang State Key of Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

Under extended-phase-shift (EPS) modulation, both the internal phase-shift angle and the external phase-shift angle will have large step changes when the dual-bridge series resonant converter (DBSRC) rapidly adjusts the transmission power. This will cause serious oscillations in the resonant current and resonant voltage of DBSRC and threaten the safety of the converter. This paper analyzes the transient process produced by sudden changes in phase shift angles under EPS modulation. Then a fast transient control method is proposed for suppressing the oscillation by utilizing both internal and external phase-shift angles, which controls the transient process within one switching cycle and achieves a smooth transition of transmission power. Besides, impact and oscillation on the resonant current and resonant voltage during transient processes are significantly reduced. Finally, the performance of the control method is verified based on experimental and simulation results.

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An Optimal Direct Torque Control Scheme for DC-biased Vernier Reluctance Machine Drives

An Optimal Direct Torque Control Scheme for DC-biased Vernie...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Zimin Li Wubin Kong Ronghai Qu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

An optimal direct torque control (OPT-DTC) scheme is proposed for DC-biased vernier reluctance machines (VRMs) to improve the steady and dynamic performance of drive system. Firstly, the nonlinear model of DC-biased VRM is proposed in synchronous rotating frame. Then, the optimal control theory is employed to the model by designing an optimal torque controller with the ability of regulating zero-sequence current. The feedforward control terms are designed to improve the dynamic response, and the feedback control terms are designed to improve the steady performance. An optimal load torque observer is designed for speed control. Finally, comparative experiments with conventional DTC schemes for DC-biased VRMs are carried out to verify the superior performance of the proposed method, including higher accuracy of torque and flux and faster dynamic response.

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Stability Analysis and Impedance Reshaping Control of Medium-Frequency Oscillation in a PMSG-based Wind Farm Connected to a VSC-HVDC 7

Stability Analysis and Impedance Reshaping Control of Medium...

引用

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

作者： Sun, Kun Li, Dahu Yao, Wei Zhou, Yi Wen, Jinyu Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China State Grid Hubei Electric Power Company Limited Wuhan China Sichuan University Department of Electrical and Engineering Chengdu China

ISBN: (纸本)9781665418195

It is well known that the permanent magnet synchronous generator (PMSG)-based wind farm may face the sub-synchronous oscillation (SSO) or high frequency oscillation (HFO) issue. However, the medium frequency oscillation (MFO) may also exist in a PMSG-based wind farm when integrated with a voltage source converter based HVDC (VSC-HVDC). In this work, to investigate the mechanism and characteristics of MFO, the impedance model of the interconnected system is derived. Furthermore, the influence of the control parameters of both PMSG and VSC-HVDC on MFO is analysed with an accurate criterion based on the single input single output (SISO) equivalent sequence impedance. And the theoretical analysis is verified by simulation. Finally, an impedance reshaping control for MFO is proposed. The results show that MFO can be suppressed with the appropriate virtual impedance installed in the wind farm VSC (WFVSC) station, which is meaningful for the actual project. © 2022 IEEE.

关键词： Permanent magnets

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