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7th CAA International Conference on Vehicular control and Intelligence, CVCI 2023

作者： Zhang, Shilong Wang, Fei Lu, Henghui Yang, Shen State Key Laboratory of Automotive Simulation and Control Jilin University Changchun China

ISBN: (纸本)9798350340488

In order to enhance the real-time performance of model predictive control (MPC) based energy management strategy (EMS), this paper proposes a real-time automotive energy management strategy based on backpropagation neural network (BPNN) approximation of MPC controller. Firstly, establish a pure electric vehicle (PEV) simulation model, then design a BP neural network, and the joint simulation model is established to predict the speed, the energy management is finally realized by combining the energy consumption evaluation model. Compared with the EMS based on MPC controller, the energy-saving control effect is marginally diminished, and the real-time performance of vehicle speed track prediction is greatly improved. The proposed EMS can optimize the driver's speed trajectory and control vehicle movement in real-time, resulting in better comprehensive energy-saving control effects compared to traditional MPC. © 2023 IEEE.

关键词： Backpropagation neural network Electric vehicles Energy management strategy Model predictive control Velocity prediction

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Research on Air Supply system control of PEMFC Based on LQR control

Research on Air Supply System Control of PEMFC Based on LQR ...

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China SAE Congress, 2021

作者： Zeng, Xiaohua Song, Meijie Song, Dafeng Niu, Chaofan State Key Laboratory of Automobile Simulation and Control Jilin University Changchun China

ISBN: (纸本)9789811938412

Proton exchange membrane fuel cell (PEMFC) is composed of several coupled components with complex nonlinear characteristics. Coordinating the work of each component and effectively controlling the air supply system are key measures to improve the efficiency of the system. In order to control the air supply system of PEMFC, this paper explores the influence of different input parameters on the energy consumption efficiency of the system, quantifies the relationship between the variables, and studies the change law of power consumption efficiency and peroxide ratio of the system. After that, separate feed-forward, feed-forward + feedback and LQR control algorithms are used to control the optimal peroxide ratio respectively, and the algorithms are verified by Matlab/Simulink simulation. The results show that the LQR algorithm has the best dynamic response speed, which is shortened by 17.0% and 47.1% compared with the feed-forward + feedback control and separate feed-forward control systems. At the same time, the maximum control error of LQR algorithm is the smallest, which is 52.6% and 84.6% lower than that of feed-forward + feedback control and separate feed-forward control. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： MATLAB

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Thermodynamic-based ecological scaling theory in urban metabolic framework:a review

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Frontiers of Environmental Science & Engineering 2025年第1期19卷 69-85页

作者： Gengyuan Liu Mingwan Wu State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing 100875China Beijing Engineering Research Center for Watershed Environmental Restoration&Integrated Ecological Regulation Beijing 100875China

Prior research has consistently demonstrated that urban economic and social systems adhere to the empirical scaling ***,a plethora of evidence,including the scale-free networks of energy metabolism,the allometric growth patterns of species and populations,and the scaling law relationship between exergy and transformity in biosphere systems across various levels,indicates that urban ecosystems exhibit multi-level scaling law characteristics in energy metabolism under self-organization,alongside significant human activity *** study synthesizes these findings to hypothesize that urban ecological components are also aligned with system-level scaling theory within the urban metabolism *** encompasses:1)the existence of multistable coexistence and mutual transformation phenomena,mirroring the dynamic nature of scaling laws;and 2)a nuanced balance between the ecosystem and the socio-economic system,particularly in the realms of spatial competition and output *** ecosystem scaling theory hypotheses of urban metabolic processes offer a theoretical foundation for identifying ecological security tipping points,which are pivotal in the strategic decision-making for ecological planning and management in the future.

关键词： Ecosystem scaling theory Urban metabolism Complexity Critical review

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A bacteria-based index of biotic integrity indicates aquatic ecosystem restoration

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Environmental Science and Ecotechnology 2024年第6期22卷 178-190页

作者： Qi Liu Senlu Yin Yujun Yi School of Environment Beijing Normal UniversityBeijing 100875China State Key Laboratory of Water Environment Simulation and Pollution Control Beijing Normal UniversityBeijing 100875China

Intensive ecological interventions have been carried out in highly polluted shallow lakes to improve their environments and restore their ***,certain treatments,such as dredging polluted sediment and stocking fish,can impact the aquatic communities,including benthos and *** impacts can alter the composition and characteristics of aquatic communities,which makes community-based ecological assessments *** we develop a bacteria-based index of biotic integrity(IBI)that can clearly indicate the restoration of aquatic ecosystems with minimal artificial *** applied this method to a restored shallow lake during 3-year intensive ecological *** interventions reduced nutrients and heavy metals by 27.1%and 16.7%in the sediment,while the total organic carbon(TOC)increased by 8.0%due to the proliferation of ***,the abundance of sulfur-related metabolic pathways decreased by 10.5%as the responses to improved *** score of bacteria-based IBI,which is calculated based on the diversity,composition,and function of benthic bacterial communities,increased from 0.62 in 2018 to 0.81 in *** study not only provides an applicable method for aquatic ecological assessment under intensive artificial interventions but also extends the application of IBI to complex application scenarios,such as ecosystems with significantly different aquatic communities and comparisons between different basins.

关键词： Baiyangdian lake 16S rRNA Benthic bacterial community Ecological restoration Aquatic ecological assessment

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Optimal Scheduling for Agricultural Multi-Energy Park with Combined Wind-Solar-Biomass Energy Supply

Optimal Scheduling for Agricultural Multi-Energy Park with C...

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2023 International Conference on Power system Technology, PowerCon 2023

作者： Wang, Xuan Zhao, Qianyu Wang, Shouxiang Tianjin University Key Laboratory of Smart Grid of Ministry of Education Tianjin Key Laboratory of Power System Simulation and Control Tianjin China

ISBN: (纸本)9798350300222

Agricultural multi-energy park (AMEP) is an essential pathway for upgrading and transforming traditional agriculture, and the utilization of renewable energy can contribute to its sustainable development. In this context, this paper proposes an optimal scheduling method for AMEP with combined wind-solar-biomass energy supply. The biomass energy contained in waste from the user side can be reused and combined with wind and solar energy to achieve a diversified supply of renewable energy. Besides, a biogas heat-electricity cogeneration with adjustable thermoelectric ratio is introduced, enhancing the flexibility of electricity and heating supply for AMEP. In addition, an adder carbon tax mechanism is considered to incentivize energy conservation and emissions reduction of AMEP. simulation results demonstrate that the proposed optimal scheduling model can more effectively utilize renewable energy, leading to significant advantages in enhancing the flexibility, economy, and low carbon of AMEP. © 2023 IEEE.

关键词： Biomass

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Lane change trajectory planning method for intelligent vehicles considering surrounding risk 7

Lane change trajectory planning method for intelligent vehic...

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7th CAA International Conference on Vehicular control and Intelligence, CVCI 2023

作者： Liu, Ke Wang, Honglin Fu, Yao Liu, Haoran The State Key Laboratory of Automotive Simulation and Control Jilin University Changchun China

ISBN: (纸本)9798350340488

Intelligent vehicle trajectory planning is a multi-objective coupling optimization problem with multiple constraints. Rapid generation of collision-free smooth trajectories that meet kinematic and dynamic constraints can improve the safety and comfort of intelligent vehicle lane-changing process. In order to improve the efficiency of trajectory planning, this paper uses the path and speed decoupling method to generate a feasible lane-changing trajectory set. First, the B-spline curve is used to generate a feasible lane-changing path, and then the speed planning is completed based on Dynamic programming (DP) and Quadratic programming (QP). Considering safety, comfort and efficiency, a comprehensive cost function is established, and the trajectory with the smallest cost function is selected as the output target. The safety cost function is based on the theory of driving risk field, and the safety potential energy index is used to evaluate the safety of the trajectory, which can quantify the risk level of the surrounding traffic factors on the whole process of lane-changing. The simulation results show that the proposed method can quickly plan a reasonable trajectory in the lane-changing scene, and can effectively avoid collision with dynamic obstacles while maintaining safety and efficiency. © 2023 IEEE.

关键词： comprehensive cost function intelligent vehicle surrounding risk trajectory planning

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Optimal Scheduling for Multi-energy system Considering Coupling of Molten Medium Hydrogen Production and Pipeline Energy Storage 3

Optimal Scheduling for Multi-energy System Considering Coupl...

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3rd New Energy and Energy Storage system control Summit Forum, NEESSC 2023

作者： Wang, Xuan Zhao, Qianyu Wang, Shouxiang Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin Key Laboratory of Power System Simulation and Control Tianjin China

ISBN: (纸本)9798350309348

Existing hydrogen production technologies always have weakness of large carbon emission, and there are still many research gaps in coupling with multi-energy flow. To this end, this paper proposes an optimal scheduling model for multi-energy system (MES) considering coupling of molten medium hydrogen production (mmH2P) and pipeline energy storage (PES). The mmH2P is introduced into MES to achieve the in-situ green conversion of gas and the zero-carbon-emission hydrogen production while obtaining solid carbon. Further, a Refined PtGmmH2P mode is proposed combining mmH2P, power-to-gas and hydrogen storage. Besides, the PES due to different transmission inertia of energy flows is considered, and its coupling coordination promotion with Refined PtG-mmH2P is further analyzed. Case study proves that the proposed scheduling model of MES can achieve the win-win of economy, low carbon and high renewable energy consumption rate. ©2023 IEEE.

关键词： Pipelines

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Ladder Time Stepwise Inertia Coordinated control Method of Multiple Wind Farms to Suppress system Frequency Secondary Drop

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Energy Engineering 2024年第8期121卷 2293-2311页

作者： He Li Xianchao Liu Jidong Li Yuchen Qiu Tongliao PowerSupply Company State Grid East Inner Mongolia Electric Power CompanyTongliao028000China Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Northeast Electric Power UniversityJilin132012China

Currently,both regulated and deregulated power trading exist in China’s power system,which has caused imbalanced funds in the electricity *** this paper,a simulation analysis of the electricity market with wind energy resources is conducted,and the calculation methods of unbalanced funds are investigated *** detail,the calculation formulas of unbalanced funds are illustrated based on their definition,and a two-track electricity market clearing model is ***,the concept of the dual-track system is explained,and the specific calculation formulas of various types of unbalanced funds are ***,considering the renewable energy consumption,the market clearing model based on DC power flow is constructed and solved;by combining fitting methods of mid-and long-term curves,the unbalanced funds are calculated based on clearing results and formulas.

关键词： Wind power stepwise inertial frequency control secondary drop

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Achieving high ductility and low in-plane anisotropy in magnesium alloy through a novel texture design strategy

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Journal of Magnesium and Alloys 2024年第7期12卷 2863-2873页

作者： Shi Liu Cheng Wang Hong Ning Zhao-Yuan Meng Kai Guan Hui-Yuan Wang State Key Laboratory of Automotive Simulation and Control Jilin UniversityPR China Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Nanling CampusJilin UniversityNo.5988 Renmin StreetChangchun130025 PR China State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Material Science and EngineeringHebei University of TechnologyTianjin300130 PR China

Texture regulation is a prominent method to modify the mechanical properties and anisotropy of magnesium *** this work,the Mg-1Al-0.3Ca-0.5Mn-0.2Gd(wt.%)alloy sheet with TD-tilted and circular texture was fabricated by unidirectional rolling(UR)and multidirectional rolling(MR)method,*** generating a strong in-plane mechanical anisotropy in conventional TD-tilted texture,the novel circular texture sample possessed a weak in-plane yield *** can be rationalized by the similar proportion of soft grains with favorable orientation for basalslip and{10.12}tensile twinning during the uniaxial tension of circular-texture sample along different ***,compared with the TD-tilted texture,the circular texture improved the elongation to failure both along the rolling direction(RD)and transverse direction(TD).By quasi-in-situ EBSD-assisted slip trace analysis,higher activation of basal slip was observed in the circular-texture sample during RD tension,contributing to its excellent *** loading along the TD,the TD-tilted texture promoted the activation of{10.12}tensile twins significantly,thus providing nucleation sites for cracks and deteriorating the *** research may shed new insights into the development of formable and ductile Mg alloy sheets by texture modification.

关键词： Magnesium alloy TD-tilted texture Circular texture In-plane yield anisotropy Ductility

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Estimating NOx Sensor Ammonia Cross-Sensitivity Factor Using a Data-Driven Approach in SCR systems 7

Estimating NOx Sensor Ammonia Cross-Sensitivity Factor Using...

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7th CAA International Conference on Vehicular control and Intelligence, CVCI 2023

作者： Wang, Ning Gong, Xun Hu, Yunfeng Sun, Yao State Key Laboratory of Automotive Simulation and Control College of Artificial Intelligence Jilin University Changchun China State Key Laboratory of Automotive Simulation and Control College of Telecommunications Engineering Jilin University Changchun China State Key Laboratory of Automotive Simulation and Control College of Automotive Engineering Jilin University Changchun China

ISBN: (纸本)9798350340488

Selective Catalytic Reduction (SCR) is a module used in the aftertreatment system to mitigate the nitrogen oxides (NOx) emissions, and it can be affected by cross-sensitivity, resulting in a decrease in control performance and even controller failure. A commonly adopted approach is estimating the cross-sensitivity factor to correct the downstream NOx concentration, but the current estimation strategies often incur relatively high costs. In this paper, we propose a novel and more cost-effective method based on data-driven for estimating the cross-sensitivity factor. Specifically, we design a network architecture based on Long Short-Term Memory (LSTM) and attention mechanism. LSTM is utilized to capture the non-linear relationship between input features, historical information, and the cross-sensitivity factor. The introduced attention mechanism allows the model to focus more on important information, thereby further improving the estimation accuracy. This method eliminates the need for complex mechanism modeling and parameter calibration, and reduces the computational burden during online operation, resulting in significant time and computational resource *** simulation experiments conducted transient bench data validate the excellent performance of the designed cross-sensitivity factor estimator, as evidenced by comparative analysis with three alternative methods, and demonstrate the rationality of feature selection through the feature ablation analysis. © 2023 IEEE.

关键词： aftertreatment attention cross-sensitivity factor Long Short-Term Memory

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