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Development prospects of metal-based two-dimensional nanomaterials in lithium-sulfur batteries

Chinese Chemical Letters 2023年第1期34卷 102-113页

作者： Yuxue Mo Liling Liao Dongyang Li Rongwu Pan Yanhong Deng Yanliang Tan Haiqing Zhou College of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421002China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceDepartment of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Changsha 410082China Hunan Shengli High-tech Energy Technology Co. Ltd.Yongzhou 425000China Hunan Provincial Key Laboratory of Intelligent Information Processing and Application Hengyang 421002China

A lithium-sulfur(Li-S)system is an important candidate for future lithium-ion system due to its low cost and high specific theoretical capacity(1675 m Ah/g,2600 Wh/kg),which is greatly hindered by the poor conductivity of sulfur,large volume change and dissolution of lithium ***-dimensional(2D)materials with monolayers or few-layers usually have peculiar structures and physical/chemical properties,which can resolve the critical issues in Li-S ***,the metal-based 2D nanomaterials,including ferrum,cobalt or other metal-based composites with various anions,can provide high conductivity,large surface area and abundant reaction sites for restraining the diffusion for lithium *** this mini-review,we will present an overview of recent developments on metal-based 2D nanomaterials with various anions as the electrode materials for Li-S *** the main bottleneck for the Li-S system is the shuttle of polysulfides,emphasis is placed on the structure and components,physical/chemical interaction and interaction mechanisms of the 2D ***,the challenges and prospects of metal-based 2D nanomaterials for Li-S batteries are discussed and proposed.

关键词： Lithium-sulfur battery Two-dimensional materials Cathode materials Anode materials Anode protection

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Adaptive control of PMSM Based on Nonlinear Disturbance Observe

Adaptive Control of PMSM Based on Nonlinear Disturbance Obse...

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Robotics, intelligent control and Artificial Intelligence (RICAI), International Conference on

作者： Tongtong Li Liang Tao Xiongfeng Deng Binzi Xu Key Laboratory of Advanced Perception and Intelligent Control of High-end Equipment Ministry of Education Anhui Polytechnic University Wuhu China

In this paper, an adaptive backstepping controller is investigated to obtain high tracking performance for permanent magnet synchronous motor (PMSM) with external load torque changing and system parameter uncertainties. A nonlinear disturbance observer (NDOB) is proposed to observe and compensate the lumped disturbance and uncertainties in real time. Then, an adaptive upper limitation is designed to estimate the bound of NDOB and the lumped disturbance to reduce the system control gain. Besides, an adaptive estimation law is designed for online identification of parameter R, which is prone to parameter perturbation. The simulation results confirm the effectiveness of the designed control method.

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Position and Attitude Finite-Time Tracking control of a VTOL Aircraft Using Adaptive Global Fast Terminal Sliding Mode control

Position and Attitude Finite-Time Tracking Control of a VTOL...

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International Conference on Electronic Measurement and Instruments, ICEMI

作者： Xiongfeng Deng Yiqing Huang Binzi Xu Liang Tao Key Laboratory of Advanced Perception and Intelligent Control of High-end Equipment Ministry of Education Anhui Polytechnic University Wuhu China

This work discusses the finite-time tracking control design for a vertical take-off and landing (VTOL) aircraft under external disturbances. Considering the existence of unknown nonlinear dynamics of VTOL aircraft, the neural network is applied to tackle each unknown term. In order to cope with the approximation errors and the aircraft system's unknown disturbances, some parameter update laws are proposed during the analysis process. After that, by utilizing the neural network-based control technique and designed global fast terminal sliding mode control (FTSMC) functions, the adaptive global FTSMC laws are final presented, which can make certain that the outputs of aircraft system tracking the given trajectories, and also make certain that the tracking errors tend to zero within a finite time. At last, the validity of designed control laws is verified through a given numerical example.

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A Case Study of Renewable Energy Resources Assessment Results in Argentina 4

A Case Study of Renewable Energy Resources Assessment Result...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Tang, Qiong Wu, Jiawei Xiao, Jinyu Zhou, Feng Wu, Xiaoqing Beijing China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Jinan China

ISBN: (纸本)9781728171494

With the increasing development of renewable energy resources in South America, to analyze "the location", "the quantity"and "the quality"of wind and solar energy resources will, not only benefit for one country on efficient resource utilization, but also promote the realization of large- scale international resource utilization and complementation. Argentina, as a major country in South America, researches on its renewable energy development is of great significance. This paper completed the renewable resources assessment through modeling and estimating the theoretical reserves, technical potential installed capacity and development cost of wind and solar energy in Argentina. Then, a more precise quantitative evaluation of development potential is given through the calculated development cost and capacity factor of technical potential installed capacity. Finally, after compared the existing power stations with the assessment results, suggestions on how to development renewable energy resources in Argentina are given. © 2021 IEEE.

关键词： Solar energy

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Sliding Mode control of T-S Fuzzy systems Under Probabilistic Input Constraints

Sliding Mode Control of T-S Fuzzy Systems Under Probabilisti...

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Youth Academic Annual Conference of Chinese Association of Automation (YAC)

作者： Zhina Zhang Jingfei Zhang Yi Wang The Key Laboratory of Advanced Perception and Intelligent Control of High-end Equipment Ministry of Education Anhui Polytechnic University Wuhu P. R. China

ISBN: (数字)9798350379228

ISBN: (纸本)9798350390780

This work investigates the sliding mode control (SMC) problem of T-S fuzzy systems under probabilistic saturation constraints, where the actuator input is permitted to exceed its pre-given threshold with a certain probability. One obstacle is how to integrate the probabilistic saturation constraints into stability and reachability analysis considering the special structure of sliding mode controller. To address this problem, an SMC law is firstly synthesized by utilizing the well-known parallel distributed compensation scheme. Subsequently, we propose an altered sector condition incorporating the sign function and membership functions (MFS) to deal with the saturation nonlinearities. Facilitated by an auxiliary inequality, sufficient criteria are derived towards ensuring the local stochastic stability of the closed-loop system and the reachability of the prescribed sliding surface. A broader domain of stochastic stability may be anticipated through an optimization problem. Ultimately, a simulation example validates the efficacy of the provided control method.

关键词： Actuators Automation Stability criteria Probabilistic logic Closed loop systems Reachability analysis Sliding mode control

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Adaptive Neural Network Dynamic Surface Tracking control of a VTOL Aircraft

Adaptive Neural Network Dynamic Surface Tracking Control of ...

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Chinese Automation Congress (CAC)

作者： Xiongfeng Deng Xianhao Yang Liang Tao Binzi Xu Fan Zhang Chen Zhang Key Laboratory of Advanced Perception and Intelligent Control of High-end Equipment Ministry of Education Anhui Polytechnic University Wuhu China

The problem of asymptotic tracking control for a vertical take-off and landing (VTOL) aircraft system is addressed in this paper, in which unknown external disturbances and nonlinear dynamics are added. Unknown nonlinear dynamics are deal with by using neural networks, and some adaptive laws are addressed. Additionally, some control laws for unknown parameters are developed to address unknown nonlinearities resulting from the analysis process. Based on the dynamic surface control approach and neural network control, the adaptive control laws with dynamic surface method and neural network are developed for the system. The results show that the developed control laws insure that the system under consideration asymptotically follows the given desired signal, and the system's tracking errors can converge to zero. At last, a simulation case is shown to validate the effectiveness of developed control strategies.

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Power Matching and Energy Efficiency Improvement of Hydraulic Excavator Driven with Speed and Displacement Variable Power Source

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Chinese Journal of Mechanical Engineering 2019年第6期32卷 142-153页

作者： Lei Ge Long Quan Xiaogang Zhang Zhixin Dong Jing Yang Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of Technology

Mobile machinery energy efficiency and emission pollution are the national and worldwide issues. This paper contributes in solving these problems by applying a speed variable power source. Unfortunately, almost all of the speed variable systems have the dynamic response problem when the motor starts with full load or heavy load. To address this problem, a hydraulic accumulator is used to balance the load of the power source for assisting starting of the motor and a matching method combined with speed and displacement control of the pump is proposed to improve the energy efficiency and dynamic performance simultaneously under different working conditions. Also, the power source/valve combined control strategy of an independent metering system is designed to realize flow matching of the whole system. Firstly, a test system is established to study the dynamic performance and energy efficiency of the speed variable power source with an auxiliary accumulator. Working performance and energy consumption of the power source under different rotating speeds and different loads are studied. And then, the hydraulic excavator test rig with the proposed system is constructed. Furthermore, the working performance of the excavator with the speed-fixed and speed-variable strategy are studied comparatively. Results show that, compared with fixed-speed strategy, the electric power consumption during the idle period and partial load condition can be reduced about 2.05 kW and 1.37 kW. The energy efficiency of speed variable power source is about 40%-71%, which is higher than that of the fixed-speed power source by 3%–10%.

关键词： Hydraulic excavator Power matching Speed variable Energy efficiency

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The Enhancing Effect of the East Asian Subtropical Westerly Jet on Summer Extreme High-Temperature Events over Central-Eastern China Since the Late 1990s

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Advances in Atmospheric Sciences 2025年第3期42卷 453-466页

作者： Chujie GAO Yuyu NIU Gen LI Shanlei SUN Bo LU Chaofan LI Bei XU Jinglong HUANG Xiubao SUN College of Oceanography&Key Laboratory of Marine Hazards Forecasting Ministry of Natural ResourcesHohai UniversityNanjing 210098China Key Laboratory of Meteorological Disaster Ministry of Education(KLME)&Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science and TechnologyNanjing 210044China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Laboratory for Climate Studies and CMA-NJU Joint Laboratory for Climate Prediction Studies National Climate CenterChina Meteorological AdministrationBeijing 100081China Xiong’an Institute of Meteorological Artificial Intellegence Xiong'an 071708China Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of the Chinese Academy of SciencesBeijing 100049China College of Intelligent Science and Control Engineering Jinling Institute of TechnologyNanjing 211169China

The increase in frequency and intensity of Extreme High-temperature Events(EHEs)over Central-Eastern China(CEC)in recent decades has severely impacted social development and *** observation and reanalysis datasets,this study explores the effect of the East Asian subtropical westerly jet stream(EAJ)on the CEC EHEs for the summers spanning 1979–*** its general relative location to the right side of the upper-level jet stream exit region,CEC would theoretically suffer more EHEs with a stronger and northwardly-shifted EAJ in summer due to the likelihood of abnormal subsidence induced by the ***,such an EAJ–EHE connection has been unstable over the past four decades but has displayed an evident interdecadal *** the late 1990s,the interannual variation of the EAJ was manifested mainly by its meridional displacement in the northeastern part of East Asia;thus,the atmospheric responses were essentially located to the east of CEC,exerting less of an influence on the CEC ***,since the late 1990s,the EAJ variation has featured an intensity change in its center over the northwest portion of the CEC,which has resulted in a westward shift in atmospheric responses to cover the CEC ***,the EAJ could potentially affect the summer CEC EHEs during 2000–*** findings offer support for an in-depth understanding of the formation mechanisms of extreme weather/climate events of this nature and thus provide a scientific reference for seasonal climate predictions.

关键词： summer extreme high-temperature events East Asian subtropical jet atmospheric circulation central-eastern China interdecadal change

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Participation of wind-storage combined system in the secondary frequency regulation control strategy of power grid 2

Participation of wind-storage combined system in the seconda...

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2024 2nd International Conference on Power, Grid and Energy Storage, PGES 2024

作者： Cheng, Yan Dong, Cun Sun, Shumin Wang, Chenglong Song, Yu Wu, Shouyuan Huan, Jiafei Liu, Yu State Grid Shandong Electric Power Company Electric Power Research Institute China National Electric Power Dispatching and Control Center Xicheng District Beijing100031 China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Shandong Province Jinan250061 China North China Branch of State Grid Corporation of China China

The secondary frequency modulation of the unit, that is, the automatic generation control (AGC), is the process of increasing or decreasing the power of the power generation unit by the power plant unit according to the dispatching command issued by the power grid dispatching center, and then using the frequency modulator to restore the frequency. Based on the principle of AGC, this paper establishes a frequency dynamic response model of the secondary frequency modulation of the traditional unit and the wind storage participation system including load frequency control (LFC) and traditional proportional-integral-derivative (PID) controllers, determines the frequency modulation control strategy of wind storage, and uses the distribution mode based on Area control Error (ACE) signal to assist in the secondary frequency modulation. In order to solve the parameter optimization problem of the classical PID controller when the wind-storage combined system participates in the secondary frequency modulation under the large load disturbance, a parameter optimization model of the controller with PID was established, and the ITAE evaluation index was finally selected as the fitness function by comparing different fitness evaluation indexes. To overcome the problem that the conventional Particle Swarm Optimization (PSO) is prone to local extremum, the inertia weights and learning factors are adjusted nonlinearly to balance and optimize the global and local optimization capabilities and improve the search efficiency, and the parameters of the PID controller are optimized by the improved PSO algorithm. The simulation results show that the proposed algorithm improves the secondary frequency modulation effect under the background of a high proportion of renewable energy connected to the power grid. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Particle swarm optimization (PSO)

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Adaptive Backstepping Sliding Mode control for Underwater Glider Trajectory Tracking Based on Nonlinear Disturbance Observer

Adaptive Backstepping Sliding Mode Control for Underwater Gl...

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2023 China Automation Congress, CAC 2023

作者： Li, Zhenjia Cao, Weihua Gan, Chao Wen, Mingming School of Automation China University of Geosciences Wuhan430074 China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan430074 China Engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of Education Wuhan430074 China Guangzhou Marine Geological Survey Guangzhou510000 China

ISBN: (纸本)9798350303759

An adaptive backstepping dynamic surface sliding mode controller based on nonlinear disturbance observer (NDOABSMC) is designed to track zigzag motion of underwater glider (UG). Firstly, a nonlinear disturbance observer is devised to observe ocean current. Then, the backstepping sliding mode control is used to devise motion attitude controller of UG to ensure that UG can track the target trajectory quickly. Additionally, the stability of UG's control system is analyzed. In the end, the proposed control strategy is compared with other approaches. © 2023 IEEE.

关键词： Backstepping

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