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SSRN 2022年

作者： Han, Yongqiang Wu, Heng Xie, Fangxi State Key Laboratory of Automotive Simulation and Control Jilin University Changchun130025 China

Tests were conducted on a supercharged 4-cylinder direct injection diesel engine to investigate the effects of various engine conditions coupled with different cetane numbers (CN) on diesel engine combustion and emissions. The results showed that at 25% load, there was no pre-injection heat release for all five fuels;the onset of combustion heat release was delayed with decreasing CN, and the in-cylinder pressure and heat release rate increased. However, the CN=53.9 fuel chain alkane content was the highest, which led to the early combustion initiation point;as the load increased, the effect of CN on the heat release initiation point became smaller. The brake specific fuel consumption (BSFC) increases as the CN decrease;the difference in the brake thermal efficiency (BTE) of different fuels is slight. The higher BSFC of low CN fuel is caused by its lower calorific value. As the CN decreases, NOx, HC, and CO emissions increase, especially at low load conditions;the impact of CN changes on emissions is more prominent. As the load increases, the peak particle number concentration tends to rise first and then fall, and the peak corresponds to the particle size-shifting toward the small particle size. As the load increases, the total mass of particulate matter (PM) tends to increase first and then decrease. In addition, the effect of the engine load change on PM emission is higher than the effect of speed change. © 2022, The Authors. All rights reserved.

关键词： Diesel engines

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Holistic Transformer: A Joint Neural Network for Trajectory Prediction and Decision-Making of Autonomous Vehicles

arXiv

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arXiv 2022年

作者： Hu, Hongyu Wang, Qi Zhang, Zhengguang Li, Zhengyi Gao, Zhenhai State Key Laboratory of Automotive Simulation and Control Jilin University Changchun130022 China

Trajectory prediction and behavioral decision-making are two important tasks for autonomous vehicles that require good understanding of the environmental context;behavioral decisions are better made by referring to the outputs of trajectory predictions. However, most current solutions perform these two tasks separately. Therefore, a joint neural network that combines multiple cues is proposed and named as the holistic transformer to predict trajectories and make behavioral decisions simultaneously. To better explore the intrinsic relationships between cues, the network uses existing knowledge and adopts three kinds of attention mechanisms: the sparse multi-head type for reducing noise impact, feature selection sparse type for optimally using partial prior knowledge, and multi-head with sigmoid activation type for optimally using posteriori knowledge. Compared with other trajectory prediction models, the proposed model has better comprehensive performance and good interpretability. Perceptual noise robustness experiments demonstrate that the proposed model has good noise robustness. Thus, simultaneous trajectory prediction and behavioral decision-making combining multiple cues can reduce computational costs and enhance semantic relationships between scenes and agents. © 2022, CC BY.

关键词： Decision making

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simulation Research on Primary Frequency Regulation Coordination control Strategy of Hybrid Wind-PV-ES Power Station Based on AGC 12

Simulation Research on Primary Frequency Regulation Coordina...

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12th Annual Meeting of CSEE Study Committee of HVDC and Power Electronics, HVDC 2023

作者： Li, Shengnan Hu, Yun He, Xin Zhu, Yihua He, Tingyi Luo, Chao Deng, Can Zeng, Guanming Su, Mingzhang Yunnan Electric Power Research Institute Kunming China National Energy Power Grid Technology R&D Centre Guangzhou China State Key Laboratory of HVDC Electric Power Research Institute CSG Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power GridGuangzhou China

ISBN: (纸本)9781839539848

With the increase of wind and solar renewable energy penetration in power system, the frequency control ability of power system completely depending on traditional power supply has weakened. This actuality requires that renewable energy stations should be equipped with a certain amount of energy storage to improve the primary frequency control ability. This paper considers the fast response ability and flexible control of energy storage for both charging and discharging, as well as its unique frequency response characteristics. Firstly, the control characteristics of the primary frequency regulation of the hybrid wind-solar-storage power station(Wind-PV-ES) are analyzed. By improving the automatic generation control(AGC) strategy of the hybrid Wind-PV-ES power station, a coordinated control strategy for the primary frequency regulation of the hybrid Wind-PV-ES power station is proposed for different frequency ranges based on the improved AGC control. After the primary frequency regulation action, the energy storage output is given priority control before wind and solar. When the energy storage active margin is insufficient, use the frequency regulation capacity of wind and photovoltaic power system to improve the primary frequency regulation capacity of the hybrid Wind-PV-ES power station. The control strategy proposed in this paper can improve the primary frequency regulation capability of renewable energy station. Finally, the paper verifies the effectiveness of the proposed control strategy through simulation. © The Institution of Engineering & Technology 2023.

关键词： Energy storage

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Design and Development of New Solid-state DC Circuit Breaker 6

Design and Development of New Solid-state DC Circuit Breaker

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Zhong, Jianying Deng, Yuan Yan, Xin Qu, Lu Fan, Naiyuan Feng, Jian Gan, Zhizheng Pinggao Group CO. Ltd Pingdingshan China Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Beijing China Dc Research Center Sichuan Energy Internet Research Institute Tsinghua University Chengdu China

ISBN: (纸本)9798350346671

Solid-state DC circuit breakers are key equipment for the protection of medium and low voltage DC systems and are the most effective means of isolating short-circuit faults. With the development of high-power power electronics, the performance of solid-state DC circuit breakers has also improved. In this paper, a new topology of anti-parallel connection is proposed based on the reverse blocking IGCT, which requires fewer switches, lower cost and smaller loss than the anti-series and diode-bridge structure. Besides, a snubber branch design method based on MOV-C is proposed, which can effectively suppress the breaking overvoltage and AC harmonics. Finally, a prototype of low-voltage solid-state DC circuit breaker with rated voltage of 750V was developed, and the breaking test and temperature test were carried out. © 2023 IEEE.

关键词： Electric circuit breakers

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Research on Modeling of Current Transformer for Travelling Wave Fault Location Test 10th

Research on Modeling of Current Transformer for Travelling W...

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10th Frontier Academic Forum of Electrical Engineering, FAFEE 2022

作者： Cui, Liu Li, Shuyong Huang, Libin Guo, Qi Deng, Lijun State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou510663 China National Energy Power Grid Technology R and D Centre Guangzhou510663 China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou510663 China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou510663 China

ISBN: (纸本)9789819934034

In order to test the travelling wave fault location devices that widely used in power system, a simulation model that can reflect the transformer characteristics of travelling waves on the transmission channel should be built. In this paper, the current transformer (CT) on the transmission channel is modelled, then the CT attenuation characteristic to travelling waves is proved by adding sine wave and square wave on the CT primary side. By using PSCAD and travelling wave fault locator examiner, a half-real time simulation environment is constituted to test the travelling wave fault locator. In PSCAD, CT is modeled by measuring parameters. Finally, amplitude frequency response characteristics of the actual CT and the CT model are compared. The result shows that simulation model in this paper reflects well on the CT high-frequency attenuation characteristic. © Beijing Paike Culture Commu. Co., Ltd. 2023.

关键词： Electric instrument transformers

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Combustion and Emissions Characteristics of Combined Injection Dual Fuel Engines with Cng Direct Injection and Gasoline Port Injection at Different Injection and Ignition Timing Combinations

SSRN

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SSRN 2022年

作者： Sun, Ping Zhu, Huamei Yang, Song Dong, Wei Yu, Xiumin Fu, Zhihao State Key Laboratory of Automotive Simulation and Control Jilin University Changchun130022 China

The Direct Injection (DI) of Compressed Natural Gas (CNG) in a CNG/gasoline dual fuel engine had the advantages of suppressing the knock tendency and expanding the lean burn limit of Spark Ignition (SI) engines without loosing their volumetric efficiency. However, the effects of CNG Direct Injection Timing (DIT) and Spark Timing (ST) on the performances of engines were rarely reported, despite their significant importance on the formation of stratified fuel mixture. Thus, the performance, combustion and emissions characteristics of CNG/gasoline combined injection SI engines under different combinations of CNG DIT and ST were experimentally studied. The results showed that the optimal CNG DIT and ST yielded higher torque, lower Brake Specific Fuel Consumption (BSFC), larger Effective Thermal Efficiency (ETE) and less Particle Numbers (PN) emissions compared with those of non-optimal combinations. The variation of ST dominated the change of engine performance under different CNG DIT and ST combinations. For a specific CNG DIT, advancing ST resulted in higher in-cylinder pressure and Heat Release Rate (HRR), earlier combustion phase, and shorter flame propagation duration;however, the flame development duration became longer and HC, NOx emissions were larger for earlier STs. The majority of the PN emissions of CNG/gasoline engines with CNG DI was in the Nucleation Mode (NM);and the particle size followed an unimodal nucleation distribution pattern peaking around 15 nm. © 2022, The Authors. All rights reserved.

关键词： Gasoline

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Formation mechanism and control strategy for particulate nitrate in China

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Journal of Environmental Sciences 2023年第1期35卷 476-486页

作者： Haichao Wang Keding Lu Zhaofeng Tan Xiaorui Chen Yuhan Liu Yuanhang Zhang School of Atmospheric Sciences Sun Yat-sen UniversityGuangzhou 510275China State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Institute of Energy and Climate Research IEK-8:TroposphereForschungszentrum Jülich GmbHJülich 52428Germany Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China China Institute of Atomic Energy Beijing 100193China

Over the past decade,fine particulate matter(PM)pollution in China has been abated significantly,benefiting from strict emission control measures,but particulate nitrate continues to ***,we review the progress in particulate nitrate(p NO3-)pollution characterization,nitrate formation mechanisms,and the proposed control strategies in *** spatial and temporal distributions of p NO3-are *** current status of knowledge on the chemical mechanism is updated,and the significance of its formation pathways is assessed by various approaches such as field observation and modelling of nitrate production rate,as well as isotopic *** factors impacting p NO3-formation and the corresponding pollution regulation strategies are discussed,in which the importance of atmospheric oxidation capacity and ammonia are ***,the challenges and open questions in p NO3-pollution control in China are outlined.

关键词： Particulate nitrate Reactive nitrogen Particulate matter Formation mechanism Air pollution control

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Autonomous Vehicle Path Tracking control based on Adaptive Dynamic Programming

Autonomous Vehicle Path Tracking Control based on Adaptive D...

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Conference on Vehicle control and Intelligence (CVCI)

作者： Hongyan Guo Guangyao Li Jun Liu Zhongqiu Tan Dachuan Yu Yiming Zhang State Key Laboratory of Automotive Simulation and Control and the College of Communication Engineering Jilin University Changchun China College of Communication Engineering Jilin University Changchun China State Key Laboratory of Automotive Simulation and Control Jilin University Changchun China SAIC Motor R&D Innovation Headquarter Shanghai China

This paper presents a path tracking control method for autonomous vehicles by utilizing Adaptive Dynamic Programming (ADP). The primary goal is to enhance the path tracking performance under various longitudinal speeds. The proposed approach incorporates the consideration of nonlinear tire characteristics and establishes a nonlinear vehicle system model based on the fundamental principles of vehicle dynamics. By formulating a performance index function that captures the correlation between the vehicle’s position and desired paths, the optimal control strategy is obtained using the Dual Heuristic Programming algorithm (DHP), known for its computational efficiency, within the ADP framework. The simulation results verify the effectiveness of the proposed path tracking control scheme, which can have better control performance under different vehicle speeds.

关键词：

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Flow Analysis and Optimization of the Air channel of Drying Chamber Based on CFD 2

Flow Analysis and Optimization of the Air channel of Drying ...

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2nd International Seminar on Computer Science and Engineering Technology, SCSET 2020

作者： Li, Ming Liu, Jianqiao Niu, Hongwei Jiang, Yan State Key Laboratory of Automotive Simulation and Control Jilin University Changchun China Fawer Automotive Parts Limited Company China

According to the structure of the air channel in the drying chamber of an automobile factory, a model of the original structure of the drying chamber was established. The air flow of this structure is analyzed based on the CFD simulation, and the velocity at specific points of the car shell being dried is also analyzed. The results show that the original drying chamber structure is optimized, the air flow is uniform in the drying air chamber and short circuit of air between inlet and outlet in the drying chamber is decreased. © Published under licence by IOP Publishing Ltd.

关键词： Air

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NUMERICAL simulation OF SURFACE DISCHARGE IN OIL PAPER INSULATION BASED ON FINITE ELEMENT METHOD AND CELLULAR AUTOMATA 22

NUMERICAL SIMULATION OF SURFACE DISCHARGE IN OIL PAPER INSUL...

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22nd International Symposium on High Voltage Engineering, ISH 2021

作者： Chen, Jianning Zhou, Yuanxiang Zhang, Yunxiao Huang, Xin Zhang, Ling State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

ISBN: (纸本)9781839536052

Surface discharge of oil paper insulation is one of the insulation defects in converter transformers. However, the mechanism of surface discharge in oil paper insulation remains unclear. A novel method of surface discharge in oil paper insulation based on finite element method (FEM) and cellular automata (CA) was proposed to study the mechanism and fractal characteristics. Firstly, the needle-plate electrode without normal component of electric field density was adopted as the geometric model, on which the unstructured triangular mesh generation was performed. Then, the FEM is applied to compute the distribution of potential, electric field and charge in the simulated field, which performed better than finite difference method (FDM) in accuracy and complexity of computation. Finally, the CA model was adopted to simulate the development of surface discharge with the electric field threshold. The results indicated that the numerical simulation model based on FEM-CA can simulate the dynamic process and fractal characteristics of surface discharge in oil paper insulation. According to the fractal dimension curve, the surface discharge can be obviously divided into three stages: inception, propagation and flashover. With the increase of applied voltage, the fractal dimension of surface discharge increases in inception stage, then decreases in propagation stage, and finally increases in flashover stage. © 2021 The Institution of Engineering and Technology.

关键词： Cellular automata

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