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Robust Model Predictive Control Based on Linear Fitting for Surface-Mounted Permanent Magnet Synchronous Motor

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Robust Model Predictive Control Based on Linear Fitting for ...

International Conference on Electrical Machines and systems (ICEMS)

作者： Hanrui Wang Nannan Sun Chen Li Youliang Fu Qinghui Meng Yanfei Cao Guangjie Shao Fei Wang Jing Zhang Weichai Power Co. Ltd Weifang China State Key Laboratory of Engine and Powertrain System Weifang China Zhejiang University Advanced Electrical Equipment Innovation Center Hangzhou China College of Electrical Engineering Zhejiang University Hangzhou China

ISBN: (数字)9784886864406

ISBN: (纸本)9798350379105

In order to improve the robustness of the model predictive control (MPC) for surface-mounted permanent magnet synchronous motor, this paper proposes a robustness MPC method using the linear fitting method based on orthogonal regression. The propo0sed method employs the current augmenter prediction model to eliminate the effects of the permanent magnet flux linkage, and designs the linear fitting method based on orthogonal regression to estimate the stator inductance to improve the robustness of the MPC method. Finally, the proposed MPC method is validated by means of the experimental results on a 3.1kW test platform.

关键词： Inductance Simulation Fitting Stators Permanent magnet motors Robustness Surface fitting Real-time systems Steady-state Predictive control

Confinement-Regulated Lamellar Interphase with Enhanced Dielectric Environments for Lithium Metal Batteries

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ACS nano 2025年第22期19卷 2025 May 30页

作者： Ruixin Lv Chong Luo Ke Wang Wangming Tang Bingran Liu Yi Liu Yang Li Li Li Feng Wu Renjie Chen Beijing Key Laboratory of Environmental Science and Engineering School of Material Science and Engineering Beijing Institute of Technology Beijing 100081 China. Shandong Key Laboratory of Advanced Chemical Energy Storage and Intelligent Safety Advanced Technology Research Institute Beijing Institute of Technology Jinan 250300 China. Innovative Research Team in High-Safety Energy Storage System and Smart Microgrids of Guangdong Province Beijing Institute of Technology (Zhuhai) Zhuhai 519088 China. National Key Laboratory of Science and Technology on Power Sources Tianjin Institute of Power Sources Tianjin 300384 China. Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081 China.

The natural solid electrolyte interphase (SEI) typically consists of complex ingredients and disordered structures, posing significant challenges in achieving rapid Li desolvation and uniform Li deposition, which leads to uncontrolled electrolyte decomposition and lithium dendrite growth. This study designs a lamellar sieving interphase with enhanced dielectric environments, achieved through confinement-regulated polymer chain conformation, effectively decoupling the Li desolvation and deposition processes. The lamellar interphase selectively sieves solvent molecules, promoting Li desolvation and enhancing the dissociation of lithium salts. The nanofluidic channel within the confined lamella promotes ion transfer, ensuring uniform ion distribution and improving mechanical stability. Lithium metal anodes with this lamellar interphase exhibit exceptional stability during stripping/plating cycling, maintaining stable performance for over 2000 h at 2 mA cm. Furthermore, LiFePO||Li and NCM811||Li batteries assembled with the lamellar interphase demonstrate a stable reversible capacity and cycling performance. This study presents a lamellar interphase design, offering tunable confinement and regulation mechanisms to decouple the Li desolvation and deposition processes with stable cycling performance in lithium metal batteries.

关键词： Confinement Dielectric environment Lamellar interphase Li+ deposition Lithium metal batteries

Ternary blend strategy in benzotriazole-based organic photovoltaics for indoor application

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Green Energy & Environment 2021年第6期6卷 920-928页

作者： Yinglong Bai Runnan Yu Yiming Bai Erjun Zhou Tasawar Hayat Ahmed Alsaedi Zhan'ao Tan State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing102206China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing100029China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing100190China NAAM Research Group Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

Organic photovoltaics(OPVs)suitable for application in indoor lighting environments can power a wide range of internet of things(Io T)related electronic *** ternary structure has huge advantages in improving the photovoltaic performance of OPVs,including broadening the light absorption,improving the charge transport,manipulating the energy loss(E_(loss))and so ***,we use wide-bandgap photo-active materials,including the benzotriazole-based polymer donor(J52-F),chlorinated polymer donor(PM7)and A_(2)-A_1-D-A_1-A_(2)-structured acceptor(BTA3),to construct ternary OPVs for indoor light *** from the introduction of PM7 as the third component in J52-F:BTA3-based blend,a gratifying PCE of 20.04%with a high V_(OC)of 1.00 V can be obtained under the test conditions with an illumination of 300 lx from an LED lighting source with a color temperature of 3000 *** excellent device performance is inseparable from the matched spectrum,enhanced light absorption and the reduced E_(loss),while the improved charge transport capability and suppression of carrier recombination also play an indelible *** work shows a potential material system to meet the requirement of devices applied under indoor ***,these findings demonstrate that designing multi-component OPVs is indeed a feasible way to further improve the performances of the photovoltaic energy conversion system for indoor applications.

关键词： Organic photovoltaics Indoor application Ternary blends Open-circuit voltage Charge generation

Research on Intelligent Temperature Control Method of Closed-Loop Cooling system Based on Deep Q-Network

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SSRN 2024年

作者： Liu, Yongchao Wang, Bo Zheng, Wei Wang, Zibo Li, Tong Cheng, Jiahao Niu, Zhenfeng Ke, Zhiwu Tan, Sichao Li, Jiangkuan Gao, Puzhen Tian, Ruifeng Zhu, Qidan Heilongjiang Provincial Key Laboratory of Nuclear Power System & Equipment Harbin Engineering University Harbin150001 China Key Laboratory of Nuclear Safety and Advanced Nuclear Energy Technology Ministry of Industry and Information Technology Harbin Engineering University Harbin150001 China Science and Technology Thermal Energy and Power Laboratory Wuhan430205 China Wuhan Second Ship Design and Research Institute Wuhan430205 China College of Intelligent Systems Science and Engineering Harbin Engineering University Harbin150001 China

As one of the most important subsystem types in the nuclear power system, the closed-loop cooling system is used for the heat transfer of the system. The control quality of its operating temperature is important for the safe operation of the entire nuclear power system. This paper proposes an intelligent temperature control method based on deep reinforcement learning (DRL). First, the closed-loop cooling system simulator is built and expanded to provide an experimental platform for the implementation of DRL. Secondly, a DRL interaction system is designed based on prior knowledge such as system thermal control characteristics and temperature control targets. Finally, the improved deep Q-network (DQN) algorithm is used to train the deep neural network agent, and the optimal temperature control strategy is approached and saved through self-learning interaction. The experimental results demonstrate that the DRL controller can realize automatic control operation and has good target tracking ability and robustness. © 2024, The Authors. All rights reserved.

关键词： Reinforcement learning

Misalignment Tolerance of Inductive power Transfer Coupler with Low Loss and High Magnetic Induction Ferromagnetic Materials

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Misalignment Tolerance of Inductive Power Transfer Coupler w...

2022 IEEE Industry Applications Society Annual Meeting, IAS 2022

作者： Kang, Jinping Cheng, Shaoyu Wang, Yubo Zhang, Xueying Yang, Fuyao Xu, Guorui Eldeeb, Hassan H. Zhao, Haisen State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing102206 China State Grid Smart Grid Research Institute Co. LTD. State Key Laboratory of Advanced Power Transmission Technology 102211 China Noblesville Technical Center of BorgWarner Inc. NoblesvilleIN United States Florida International University Department of Electrical and Computer Engineering MiamiFL33174 United States

ISBN: (纸本)9781665478151

In an inductive power transfer (IPT) system, various magnetic materials have difference characteristics in enhancing the degree of coupling and misalignment tolerance between the primary and secondary coils. However, the iron losses in ferromagnetic materials may decrease the transfer efficiency of the IPT system significantly. Therefore, in this study, performance and misalignment tolerance of IPT systems with four types of ferromagnetic materials are investigated. Firstly, an equivalent circuit model of the IPT system is established and the variations of system efficiency with different ferromagnetic materials are also revealed. Then, a 3-D finite element analysis (FEA) model of the magnetic coupler is established. In addition, loss test platform is established to obtain the accurate loss coefficients. Finally, the transfer efficiency and magnetic field distributions are both investigated. The results show that the high efficiency and magnetic flux density can be achieved when nanocrystalline core with vertical laminations is used. © 2022 IEEE.

关键词： Ferromagnetic materials

Thermal-Hydraulic Characteristics of Helical Cruciform Single Rod Based on Cfd Investigation

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SSRN 2024年

作者： Chen, Yiwen Zhang, Dalin Jiang, Dianqiang Deng, Jian Zhang, Xisi Wang, Xinan Tian, Wenxi Qiu, Suizheng Su, Guanghui State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China Nuclear Power Institute of China 328 Changshun Avenue Chengdu610213 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China China Institute of Atomic Energy Beijing611731 China

To increase power density in nuclear reactors, the helical cruciform fuel (HCF) is designed as a fundamental element. HCF takes advantages of strong mixing effects, self-supporting features, and strengthened heat transfer, potential to increase the fuel performance in nuclear reactors. In this paper, friction factor and heat transfer coefficient empirical correlations of HCF single rod cooled by water were proposed using a geometric dimensionless number based on numerical simulation. The velocity field, and temperature distribution were obtained to discuss influences of geometric sizes on the fuel performance. Finally, correlations with a geometric dimensionless number were validated with various cases, whose application conditions were also proposed and discussed. This paper provides a guide for study of heat transfer and fluid flow in helical structures, and a reference for establishment of reactor system model using helical cruciform fuels. © 2024, The Authors. All rights reserved.

关键词： Heat transfer coefficients

An engineering Approach for Short-Circuit Current Calculation Considering WTG Integrated

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An Engineering Approach for Short-Circuit Current Calculatio...

power Energy systems and Applications (ICoPESA), International Conference on

作者： Yiran Dong Hengchu Shi Dezhi Kong Hao You Jing Chen Shoudong Xu Jinfu Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Yunnan Electric Power Dispatching and Controlling Center China Southern Power Grid Kunming China System Analysis Department Scientific Research Institute of Yunnan Power Grid Kunming China

With the ever-increasing scale of wind power, the fault characteristics of power grids have changed dramatically, and the existing relay setting calculation approaches can no longer meet the requirements of modeling. The wind turbine generator (WTG) is usually treated as constant current source or set to zero to adapt to the traditional short-circuit current calculation software. This method does not consider the fault characteristics of the WTG, so the calculation accuracy is lower than that of iteration. However, the iterative algorithm also has problems, such as non-convergence or too many iterations leading to long computation time. Therefore, a calculation method of short-circuit current considering WTG integrated is proposed in this paper, which can solve the problem of iteration non-convergence while ensuring accuracy within the allowable range of engineering. Firstly, the WTG short-circuit current models considering converter control strategy and fault characteristics are established. Then, the branches with WTG are converted into "constant potential source + equivalent impedance" to facilitate WTG embedding in the relay protection setting calculation software and maintain consistency with the traditional synchronous generator equivalent mode. In addition, the calculation formula of equivalent impedance is deduced, and the modified voltage is also proposed to improve the accuracy. Finally, a simulation is performed in GIRGE B4-39 and part of actual power grids structures in a province to verify engineering practical value of the proposed method.

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Numerical Prediction and Experimental Study of Self-Priming Process of Vacuum Cam Pump

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SSRN 2024年

作者： Li, Jinyue Li, Yibin Lian, Jiadi Wei, Liejiang Zhang, Renhui College of Energy and Power Engineering Lanzhou University of Technology Lanzhou730050 China Key Laboratory of Advanced Pumps Valves and Fluid Control System of the Ministry of Education Lanzhou University of Technology Lanzhou730050 China College of Mechanical and Electrical Engineering China Jiliang University Hangzhou310018 China

With the intention of studying the self-priming process and the influencing factors of self-priming performance of vacuum cam pump, a self-priming performance test device suitable for high suction range pump is designed in this paper. By recording the change of the vacuum degree at inlet and the change of external characteristic parameters during the self-priming process, the influence of different speed (200rpm, 250rpm, 300rpm, 350rpm, 400rpm) on the self-priming performance and external characteristic parameters during the self-priming process was compared and analyzed when the inlet vacuum degree was 0.07MPa. According to the phase change of the Suction medium, the self-priming process is divided into three stages: inhale, gas-liquid mixed transport and steady operation. The results show that speed has a great influence on the self-priming process, which mainly reflects the change of external characteristic parameters. The influence on the self-priming performance is mainly manifested in the inhale stage, and the gap leakage has a great influence on the duration of the inhale stage. The high speed can effectively improve the gap leakage in the pump and improve the self-priming performance. © 2024, The Authors. All rights reserved.

关键词： Cams

Corrosion Behavior of Fexcrmnalcu High-Entropy Alloy in 0.5 M H2so4 Solution

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SSRN 2024年

作者： Cui, Junpeng Feng, Li Ma, Chao Wang, Zhaoqing Zhao, Yanchun School of Material Science and Engineering Lanzhou University of Technology Lanzhou730050 China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou730050 China Key Laboratory of Solar Power System Gansu Jiuquan Vocational and Technical College Jiuquan735000 China

High-entropy alloys (HEAs) FexCrMnAlCu (x=0, 0.5, 1.0, 1.5, 2.0) were prepared using vacuum arc melting. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses revealed that FexCrMnAlCu exhibits typical FCC and BCC structures. The BCC phase mainly consists of Cr, Mn, and Fe-rich dendritic (DR) structures, while the FCC phase is characterized by Cu-rich interdendritic (IR) structures. The addition of Fe did not alter the phase structure of the CrMnAlCu HEA, but it promoted the growth of the BCC phase while inhibiting the formation of the FCC phase. Immersion corrosion experiments and electrochemical tests showed varying corrosion behaviors among the alloys. The Fe0 alloy primarily exhibited corrosion in the interdendritic regions. The Fe0.5 alloy displayed interface corrosion between dendritic and interdendritic regions. The Fe1.0 alloy showed a coexistence of dendritic corrosion and interface corrosion. Both Fe1.5 and Fe2.0 alloys experienced severe selective corrosion of dendritic structures. This selective corrosion is attributed to the formation of the L12 phase within the dendritic structures, which, in conjunction with the BCC phase, resulted in galvanic corrosion. This phenomenon exacerbated the corrosion of dendritic structures in the FexCrMnAlCu HEAs. © 2024, The Authors. All rights reserved.

关键词： Corrosion resistance