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12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

作者： Liu, Jiye Zheng, Zedong Tsinghua University State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Beijing China

ISBN: (纸本)9781728158266

Paralleling SiC MOSFETs is a popular way to increase the current capacity. However, due to asymmetric layout, device parameter mismatch and other factors, imbalanced switching or dynamic current is observed among the paralleled switches in multi-device paralleling application which results in unequal switching loss, challenging the security and reliability of the system. In this paper, a common-mode choke in the gate loop is proposed and analyzed to suppress the imbalanced switching current induced by asymmetric layout in a half-bridge configuration with a Kelvin-source connection. The mechanism of the proposed method is comprehensively investigated to show that though the common-mode choke is placed in the gate loop, it can also mitigate the imbalanced current caused by asymmetric power loop. And it also shows that only the leakage inductance of the choke is seen in the gate loop and thus the switching speed is not expected to be influenced. The proposed method can be easily extended to multi-device paralleling application and the switching transients is hardly influenced by the common-mode choke. simulation and experimental results are presented to verify the proposed method. © 2020 IEEE.

关键词： Silicon

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Short-term Wind power Forecast based on Teleconnected NWP Information

Short-term Wind Power Forecast based on Teleconnected NWP In...

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2021 International Conference on power System Technology, powerCON 2021

作者： Li, Jiaming Qiao, Ying Liang, Zhifeng Lu, Zongxiang Tsinghua University State Key Lab of Power Systems Dept. of Electrical Engineering Beijing China State Grid Corporation of China National Electric Power Dispatch and Control Center Beijing China

ISBN: (纸本)9781665407373

Accurate short-term wind power forecast (WPF) is essential for power system with high proportion of renewable energy (RE) integration. Teleconnected information of numerical weather predictions (NWPs) can give more abundant meteorological information for short-term WPF so as to improve the accuracy. A novel short-term WPF system considering teleconnected NWPs is established in this paper. Firstly, the relationship between teleconnected NWPs and wind power is analyzed quantitatively. Furthermore, a data cleaning (DC) strategy and WPF model structure combining teleconnected NWPs are design. We apply our algorithm based on actual operation data of a Shandong wind farm. Results show that after applying the framework built in this paper, the performance of common used short-term WPF models such as support vector regression (SVR), multi-layer perceptron (MLP) and long short-term memory (LSTM) have been improved effectively. © 2021 IEEE.

关键词： Wind power

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Study on the thermal-electrical balance of the kW-class SOFC stack 17

Study on the thermal-electrical balance of the kW-class SOFC...

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17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021

作者： Li, Biao Lyu, Zewei Han, Minfang Sun, Kaihua Sun, Zaihong Liu, Yang Department of Energy and Power Engineering State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing100084 China Xuzhou Huatsing Jingkun Energy Co. Ltd. Jiangsu Province 221004 China

ISBN: (纸本)9781607685395

Heat and electricity are deeply coupled in solid oxide fuel cell (SOFC) stacks, and the balance and control between them are vital to the steady working condition and outputs. Therefore, studying the balance mechanism of heat and electricity is important to achieve the safe and stable operation of the SOFC stacks. In this paper, a semi-empirical simulation model of a kilowatt-level SOFC stack was established. Based on this model, the effects of different operating temperatures, flow rates, air to H2 ratios (AHR), and steam to carbon (S/C) ratios on the thermoelectric balance state of the SOFC stack were analyzed. Results show that the I-V curve can be separated into three parts: unbalance zone, unsustainable zone, and the self-heat balance zone by the self-heat balance voltage (SHBV) and the critical voltage (CV). The approximate voltage scope of the balance zone under different conditions is 0.6~0.9 V. © 2021 Electrochemical Society Inc.. All rights reserved.

关键词： Specific heat

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Performance-Aware control of Modular Batteries For Fast Frequency Response

arXiv

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arXiv 2025年

作者： He, Yutong Ruan, Guangchun Zhong, Haiwang State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing100084 China Lab for Information and Decision Systems Massachusetts Institute of Technology CambridgeMA02139 United States

Modular batteries can be aggregated to deliver frequency regulation services for power grids. Although utilizing the idle capacity of battery modules is financially attractive, it remains challenging to consider the heterogeneous module-level characteristics such as dynamic operational efficiencies and battery degradation. In addition, real-time decision making within seconds is required to enable fast frequency response. In order to address these issues, this paper proposes a performance-aware scheduling approach for battery modules to deliver fast frequency response (FFR) support. In particular, the conduction loss and switching loss of battery packs as well as converters are captured within a mix-integer quadratic constrained program (MIQCP). The cycle-based aging model identifies the aging cost of battery modules during frequent cycling by introducing the aging subgradient calculation and linearization. Case studies based on real-world battery data show that the proposed scheduling approach can effectively reduce power loss cost by nearly 28%-57% and battery aging cost by 4%-15% compared to conventional methods, which can also enhance the SoC balance. Copyright © 2025, The Authors. All rights reserved.

关键词： Battery management systems

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Learning the Inverse Kinematics of Magnetic Continuum Robot for Teleoperated Navigation

Learning the Inverse Kinematics of Magnetic Continuum Robot ...

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IEEE/RSJ International Conference on Intelligent Robots and systems (IROS)

作者： Pingyu Xiang Ke Qiu Danying Sun Jingyu Zhang Qin Fang Xiangyu Mi Shudong Wang Mengxiao Chen Yue Wang Rong Xiong Haojian Lu State Key Laboratory of Industrial Control and Technology and Institute of Cyber-Systems and Control Zhejiang University Hangzhou China State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical Engineering Xian Jiaotong University Research Center for Humanoid Sensing Zhejiang Lab 311100 Zhejiang Lab Nanhu Headquarters Hangzhou P.R. China

ISBN: (数字)9798350377705

ISBN: (纸本)9798350377712

Magnetic continuum robots are subject to external magnetic fields and deformed remotely, simplifying the robot’s transmission mechanism and providing it with significant potential for miniaturization and operational flexibility. However, modeling magnetic field distribution generated by permanent magnets is complex and requires time-consuming pre-calibrations. Moreover, it is highly susceptible to environments with ferromagnetic materials, posing significant challenges for the control of magnetic continuum robots. In response, we propose an approach that does not overly focus on the magnetic field distribution but instead directly learns the inverse kinematics of magnetic continuum robots end-to-end. Binding the robot’s configuration to the pose of external magnets, precise control of continuum robots is facilitated. Additionally, we leverage teleoperation techniques to broaden the applicability of this method. By mounting magnets on a robotic arm and directly utilizing the target pose of the external magnet predicted by a multi-layer perceptron (MLP), we achieve the operation and navigation of magnetic continuum robots in complex environments. Experiments demonstrate that the mean control accuracy along the robot using our learning-based inverse kinematics is about half of the robot’s diameter.

关键词： Uncertainty Navigation Kinematics Manipulators Permanent magnets Continuum robots Magnetic fields Robots Intelligent robots Magnetic susceptibility

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Risk Assessment with Generic Energy Storage under Exogenous and Endogenous Uncertainty

arXiv

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arXiv 2022年

作者： Qi, Ning Cheng, Lin Wan, Yuxiang Zhuang, Yingrui Liu, Zeyu State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100084 China Tianjin University China

Current risk assessment ignores the stochastic nature of energy storage availability itself and thus lead to potential risk during operation. This paper proposes the redefinition of generic energy storage (GES) that is allowed to offer probabilistic reserve. A data-driven unified model with exogenous and endogenous uncertainty (EXU & EDU) description is presented for four typical types of GES. Moreover, risk indices are proposed to assess the impact of overlooking (EXU & EDU) of GES. Comparative results between EXU & EDU are illustrated in distribution system with day-ahead chance-constrained optimization (CCO) and more severe risks are observed for the latter, which indicate that system operator (SO) should adopt novel strategies for EDU uncertainty. © 2022, CC BY.

关键词： Energy storage

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A multi-source data collection and information fusion method for distribution network based on IOT protocol 3

A multi-source data collection and information fusion method...

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3rd International Conference on Green Energy and Sustainable Development, GESD 2020

作者： Cai, Yongxiang Xiao, Xiaobing Tian, Hao Fu, Yu Wu, Peng He, Hongliu Electric Power Research Institute of Guizhou Power Grid Co. Ltd. Guiyang China State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Beijing China Binjiang College Nanjing University of Information Science and Technology Wuxi China

With the construction of Global Energy Internet, Intelligent distribution network has more and more characteristics of multi scene, multi service and changeable measurement and control objects. In order to realize data collection and information exchange among the intelligent terminal and energy, power grid, load, energy storage and other control resources in distribution network, we should research an architecture which can adapt to various data sources Based on dynamic self describing protocol. © Published under licence by IOP Publishing Ltd.

关键词： Digital storage

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Open Architecture Design of Universal Terminal for Multiple Measurement and control Scenarios of Distribution Network 3

Open Architecture Design of Universal Terminal for Multiple ...

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3rd International Conference on Green Energy and Sustainable Development, GESD 2020

作者： Zhang, Ruifeng Xiao, Xiaobing Tian, Hao Cai, Yongxiang Fu, Yu He, Hongliu Electric Power Research Institute of Guizhou Power Grid Co. Ltd. Guiyang China State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Beijing China Binjiang College Nanjing University of Information Science and Technology Wuxi China

Introduce the IoT platform technology based on SDN (Software Defined Network), cloud-based, flexible management and configuration of smart terminals, and support access to millions of terminal devices and smart operation and maintenance management. The traditional monitoring system is integrated with the Internet of Things platform, and on the basis of realizing the general SCADA system monitoring function, through the side-cloud collaboration, the lean management of the distribution station area is realized. © Published under licence by IOP Publishing Ltd.

关键词： SCADA systems

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Research and simulation on voltage stability control strategy for AC port of power electronic transformer 16

Research and simulation on voltage stability control strateg...

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16th IET International Conference on AC and DC power Transmission, ACDC 2020

作者： Shen, Yu Nie, Haozhe Cai, Weiqian Yuan, Liqiang Zhang, Chunpeng Zhao, Zhengming State Key Lab of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100084 China

ISBN: (纸本)9781839533914

With wide application of power electronic equipment in power system, voltage stability and power supply reliability need to be improved. In this paper, voltage sag caused by AC port load increase and the influencing factors are studies with a typical power electronic transformer topology as example. A calculation method which can estimate the port voltage sag performance according to the load impedance is proposed. In order to maintain the port voltage stability in the process of load increase, a voltage stability control strategy is proposed based on the double-loop control by increasing the voltage feedforward, which can improve the power supply quality and stability of power electronic transformer. Finally, the MATlab/Simulink simulation results show that the proposed scheme is accurate and effective. © 2020 Institution of Engineering and Technology. All rights reserved.

关键词： MATlab

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Initial-stage performance evolution of solid oxide fuel cells based on polarization analysis 17

Initial-stage performance evolution of solid oxide fuel cell...

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17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021

作者： Wang, Yige Lyu, Zewei Han, Minfang Sun, Zaihong Sun, Kaihua Department of Energy and Power Engineering State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing100084 China Xuzhou Huatsing Jingkun Energy Co. Ltd. Jiangsu Province Xuzhou221005 China

ISBN: (纸本)9781607685395

The performance evolution of solid oxide fuel cells (SOFCs) is more pronounced and non-linear in the initial stage, determining the output level during subsequent long-term operation. In this study, an industrial-size (10×10 cm2) cell was tested under 0.1 A cm-2 for 96 hours. I-V-P curves and EIS data under different DC bias (0, 0.05, 0.10, 0.30, 0.50, 0.70 A cm-2) were periodically recorded every 24 hours to investigate the mechanism of initialstage performance evolution. The ohmic loss was identified as the main contributor to the total overpotential, especially under large current density. The cell performance increased during 4-24 h due to the enhancement of anode gas-phase diffusion/conversion processes, while the performance degraded significantly during 48- 96 h caused by the deterioration of anode charge transfer reaction. The EIS evolution trend under different DC bias was consistent, while the evolution degree was larger under smaller current density. © 2021 Electrochemical Society Inc.. All rights reserved.

关键词： Deterioration

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