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A Model Predictive Control Method for Hybrid Energy Storage Systems

CSEE Journal of Power and Energy Systems 2021年第2期7卷 329-338页

作者： Siyuan Chen Qiufan Yang Jianyu Zhou Xia Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The traditional PI controller for a hybrid energy storage system(HESS)has certain drawbacks,such as difficult tuning of the controller parameters and the additional filters to allocate high-and low-frequency power *** paper proposes a model predictive control(MPC)method to control three-level bidirectional DC/DC converters for grid-connections to a HESS in a DC ***,the mathematical model of a HESS consisting of a battery and ultra capacitor(UC)is established and the neutral point voltage imbalance of a three-level converter is solved by analyzing the operating modes of the ***,for the control of the grid-connected converters,an MPC method is proposed for calculating steady-state reference values in the outer layer and the dynamic rolling optimization in the inner *** outer layer ensures the voltage regulation and establishes the current predictive model,while the inner layer,using the model predictive current control,makes the current follow the predictive value,thus reducing the system current *** cascaded topology has two independent controllers and is free of filters to realize the high-and low-frequency power allocation for a ***,it allows two types of energy storage devices to independently regulate the voltage and realizes the power allocation of the battery and ***,simulation studies are conducted in PSCAD/EMTDC,and the effectiveness of the proposed HESS control strategy is verified in a case,such as a controller comparison and fault scenario.

关键词： Double layer control method hybrid energy storage system(HESS) model predictive control(MPC) three-level DC/DC converter

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A Blockchain-Based Microgrid Measurement Data Storage and Tampering Detection Framework 37th

A Blockchain-Based Microgrid Measurement Data Storage and Ta...

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37th Annual Conference on Power System and Automation in Chinese Universities, CUS-EPSA 2022

作者： He, Yixuan Wang, Jingyu Shi, Dongyuan School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9789819914388

With the rapid development of distributed power generation and microgrids, secure storage of microgrid measurement data becomes an imminent issue. In order to defend against cybersecurity threats, a microgrid measurement data storage framework should not only ensure the integrity and traceability of the stored microgrid measurement data, but also be able to detect any malicious data tampering. In this paper, a microgrid measurement data storage framework based on Hyperledger Fabric, a blockchain technology, is proposed and implemented, on top of which a data tampering detection method based on the uniqueness of the transaction number (TxId) and the Strong Collision-Resistant of hash theory is developed. Case studies show that the proposed framework can well meet the requirement of data storage traceability, transparent sharing, and tampering resistance, and the requirement of automatic data tampering detection, which provides a new research idea and direction for the future study in microgrid measurement data storage. © 2023, state Grid Electric Power.

关键词： Blockchain

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New Sliding Mode Control Algorithm of Magnetic Bearing Based on state Feedback Decoupling

New Sliding Mode Control Algorithm of Magnetic Bearing Based...

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2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Liu, Haoqi Ye, Caiyong Wang, Tianyu Zhao, Yunfeng School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China National Center for Quality Inspection and Test of Motors Anhui China

ISBN: (纸本)9798331530174

A new sliding mode control method based on state feedback decoupling is introduced, which solves the problem of poor decoupling control effect of traditional control strategy on active magnetic bearing (AMB). In this paper, magnetic bearing system is divided into four independent subsystems by using the principle of linear state feedback. Secondly, considering the shortcomings of the traditional controller, a nonlinear nonsingular terminal sliding mode controller with terminal sliding mode is proposed. Aiming at the chattering problem in sliding mode control, an easy-to-implement sigmoid function is designed to replace the traditional discontinuous switching function. Finally, by building a simulation model and conducting simulation experiments, it is proved that the control strategy combining the above two methods can improve the control accuracy, response speed and robustness of the magnetic bearing control system. © 2024 IEEE.

关键词： Sliding mode control

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Recent progress of the ECRH system and initial experimental results on the J-TEXT tokamak

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Plasma Science and technology 2022年第12期24卷 127-137页

作者： Donghui XIA Xixuan CHEN Dengfeng XU Jiangang FANG Junli ZHANG Nengchao WANG Zhoujun YANG Zhongyong CHEN Yonghua DING Wei ZHENG Shaoxiang MA Zhijiang WANG Yuan PAN 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

In order to broaden the range of the plasma parameters and provide experimental conditions for physical research into high-performance plasma,the development of the electron cyclotron resonance heating(ECRH) system for the J-TEXT tokamak was initiated in *** the first stage,the ECRH system operated successfully with one 105 GHz/500 kW/1 s gyrotron in *** than 400 kW electron cyclotron(EC) wave power has been injected into the plasma successfully,raising the core electron temperature to 1.5 *** 2022,another 105 GHz/500 kW/1 s gyrotron completed commissioning tests which signifies that the ECRH system could generate an EC wave power of 1 MW in *** the support of the ECRH system,various physical experiments have been carried out on *** electron thermal transport in ECRH plasmas has been *** ECRH is turned on,the electron thermal diffusivity significantly *** runaway current is elevated when a disruption occurs during ECRH *** the injected EC wave power is 400 kW,the conversion efficiency of runaway current increases from 35% to 75%.Fast electron behavior is observed in electron cyclotron current drive(ECCD) plasma by the fast electron bremsstrahlung diagnostic(FEB).The increase in the FEB intensity implies that ECCD could generate fast electrons.A successful startup with a 200 kW ECW is *** the upgrade of the ECRH system,the J-TEXT operational range could be expanded and further relevant research could be conducted.

关键词： ECRH J-TEXT tokamak electron thermal transport runaway electron current assisted start-up

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Energy Procurement and Retail Pricing for Electricity Retailers via Deep Reinforcement Learning with Long Short-term Memory

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CSEE Journal of Power and Energy Systems 2022年第5期8卷 1338-1351页

作者： Hongsheng Xu Jinyu Wen Qinran Hu Jiao Shu Jixiang Lu Zhihong Yang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074China NARI Group Corporation Nanjing 211106China School of Electrical Engineering Southeast UniversityNanjing 210096China State Key Laboratory of Smart Grid Protection and Control Nanjing 211106China

The joint optimization problem of energy procurement and retail pricing for an electricity retailer is converted into separately determining the optimal procurement strategy and optimal pricing strategy,under the“price-taker”*** aggregate energy consumption of end use customers(EUCs)is predicted to solve for the optimal procurement strategy vis a long short-term memory(LSTM)-based supervised learning *** optimal retail pricing problem is formulated as a Markov decision process(MDP),which can be solved by using deep reinforcement learning(DRL)***,the performance of existing DRL approaches may deteriorate due to their insufficient ability to extract discriminative features from the time-series vectors in the environmental *** propose a novel deep deterministic policy gradient(DDPG)network structure with a shared LSTM-based representation network that fully exploits the Actor’s and Critic’s *** designed shared representation network and the joint loss function can enhance the environment perception capability of the proposed approach and further improve the optimization performance,resulting in a more profitable pricing *** simulations demonstrate the effectiveness of the proposed approach.

关键词： Deep reinforcement learning electricity market energy procurement long short-term memory retail pricing

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Fusion power supply advances by the J-TEXT engineering team

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Plasma Science and technology 2022年第12期24卷 85-100页

作者： Ming ZHANG Hongqi ZHANG Rumeng WANG Xiaohan XIE Wenshan WANG Yixing JIANG Zhiheng LI Peilong ZHANG Liye WANG Shaoxiang MA Yong YANG Wei ZHENG Bo RAO International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China

To meet the stringent requirements of the fusion power supply for large-scale fusion devices,the J-TEXT engineering team has carried out key technology research and applications in several important directions of fusion power *** article presents the advances made by the J-TEXT engineering team in recent years in the following areas:(1) a high-voltage power supply for an auxiliary heating system;(2) a breakdown protection device for an auxiliary heating power supply;(3) magnetic field compatibility;(4) a high-voltage pulsed power supply for a fieldreversed configuration;(5) a large physics experimental facility control *** research backgrounds,technical progress,test results,applications,summaries and prospects are described in detail in each *** innovative research results and valuable engineering experience can promote the progress of fusion power supply technology,and also lay a foundation for the development of power supplies with higher parameters in the future.

关键词： high-voltage DC power supply breakdown protection magnetic field compatibility high-voltage pulsed power supply control system

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Numerical Study of the Current Density on the Armature and Rail Interface with Dynamic Contact

Numerical Study of the Current Density on the Armature and R...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Xu, Jinghan Xia, Shengguo Chen, Lixue Ministry of Education Hubei Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Wuhan430074 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819620791

The electrical contact between the armature and rail is acknowledged as imperfect electrical contact (ImPEC), exhibiting characteristics distinct from bulk behavior. It is important to understand the current distribution of the ImPEC for future design and optimization. This paper proposes ImPEC boundary conditions by combining the contact layer model (CLM) and the Cooper-Mikic-Yoranovich model (CMYM), and the current distribution is numerically studied. Variations in the contact pressure and current density with time are analyzed. The results show a rapid increase in the contact pressure and area during the current ramp-up stage, being constant in the flat stage, and a gradual decline in the current ramp-down stage. The current path changes with the contact area, and the current shifts from the trailing edge to the leading edge over time. Additionally, comparative calculations are performed to analyze current variations under dynamic contact. Results suggest that the current distribution is influenced by magnetic diffusion and forced shifts of current caused by dynamic contact. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Threshold current density

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The evolution of chemical ordering and property in Fe1+xSe2 upon intercalation ratios

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National Science Review 2025年第2期12卷 165-176页

作者： Zijing Zhao Xiaocang Han Shengcai Zhu Zhi Fang Ziyi Han Zhongyu Liang Bailing Li Biao Zhang Wei Li Zhaochu Luo Licong Peng Xiaoxu Zhao Xiangguo Li Jiadong Zhou Song Gao Chengxin Wang Mathias Kl?ui Yanglong Hou School of Materials Science and Engineering Beijing Key Laboratory for Magnetoelectric Materials and DevicesPeking University School of Materials Shenzhen Campus of Sun Yat-sen University School of Physics and Optoelectronic Engineering Beijing University of Technology State Key Laboratory for Artificial Microstructure&Mesoscopic Physics School of PhysicsPeking University Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(MOE) School of Physics Beijing Institute of Technology School of Chemistry Sun Yat-sen University School of Materials Science and Engineering Sun Yat-sen University Institute of Physics Johannes Gutenberg University Mainz

Intercalation has been considered as an effective method to explore innovative two-dimensional（2D）materials and modify their properties. However, the relationship between intercalation concentration,structure, and property remains a largely uncharted territory, and the controllable synthesis of desired intercalated phases faces challenges. Here, a general intercalated rule for the effect of self-intercalation ratio on atomic arrangements is revealed. Then, the controllable synthesis of a series of Fe-intercalated 2D materials is realized. Scanning transmission electron microscopy illustrates that their intercalation structures undergo disordered/ordered/half-ordered/ordered transformation, which confirms the intercalated rule and proposes a new structure termed half-ordered intercalation. Notably, their magnetic and electrical properties can be significantly modulated by intercalation. Orderly intercalated nanoflakes possess room-temperature magnetism with composition-regulated magnetic domains. Moreover, Fe1.5Se2and Fe1.6Se2are scarce half-metallic materials showing different magneto-resistance behaviors. This work would guide the design and synthesis of new intercalated materials, and deepen the understanding of the relationship between structure and properties.

关键词： intercalation Fe-intercalated 2D materials room-temperature magnetism

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Fault diagnosis algorithm for 3-phase passive rectifiers based on frequency-domain analysis for acceleration grid power supply in CFETR NBI system

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Plasma Science and technology 2022年第12期24卷 40-54页

作者： Bangyou ZHU Shaoxiang MA Hongqi ZHANG Zhiheng LI Ming ZHANG Yuan PAN 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

The acceleration grid power supply(AGPS) is a crucial part of the Negative-ion Neutral Beam Injection system in the China Fusion engineering Test Reactor,which includes a 3-phase passive(diode) *** diagnose and localize faults in the rectifier,this paper proposes a frequencydomain analysis-based fault diagnosis algorithm for the rectifier in ***,time-domain expressions and spectral characteristics of the output voltage of the TPTL-NPC inverter-based power supply are ***,frequency-domain analysis-based fault diagnosis and frequency-domain analysis-based sub-fault diagnosis algorithms are proposed to diagnose open circuit(OC) faults of diode(s),which benefit from the analysis of harmonics magnitude and phase-angle of the output *** a fundamental period is needed to diagnose and localize exact faults,and a strong Variable-duration Fault Detection Method is proposed to identify acceptable ripple from OC *** simulations and experimental results demonstrate the effectiveness,quickness,and robustness of the proposed algorithms,and the diagnosis algorithms proposed in this article provide a significant method for the fault diagnosis of other rectifiers and converters.

关键词： fault diagnosis 3-phase passive rectifier acceleration grid power supply(AGPS) fault localization

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Investigation on the multi-hole directional coupler for power measurement of the J-TEXT ECRH system

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Plasma Science and technology 2022年第6期24卷 196-205页

作者： Wenting WENG Donghui XIA Yizhe TIAN Xixuan CHEN Zhijiang WANG Yuan PAN The 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

Power measurement is necessary for an electron cyclotron resonance heating(ECRH)*** directional coupler method has been put forward to monitor high-power microwave from gyrotrons in real time.A multi-hole directional coupler has been designed and manufactured for the 105 GHz/500 kW ECRH system on the J-TEXT *** the design process,we established the relationships between hole parameters and coupling characteristics based on the multi-hole coupling method and small-hole coupling ***-power tests have been carried *** results indicated the reasonability of the theoretical design and practicality of the fabricated directional *** of test errors have been discussed in detail,and the influences of spurious modes on the directional couplers have been emphatically analyzed.

关键词： directional couplers power measurement ECRH system

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