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6th CAA International Conference on Vehicular control and Intelligence, CVCI 2022

作者： Zhang, Lubing Li, Guopeng Song, Yedong Wang, Jialin Chu, Hongqing Chen, Hong Electronic Control Research Institute Weichai Power Co. Ltd. Weifang China Jilin University State Key Laboratory of Automotive Simulation and Control Changchun China School of Automotive Studies Tongji University Shanghai China

ISBN: (数字)9781665453745

ISBN: (纸本)9781665453745

Correctly identifying the surrounding driving scenes and drivers' driving styles plays an essential role in improving driving safety. This paper presents a driving style recognition algorithm considering the differences in driving scenes. The driving data of 38 randomly recruited drivers are collected by a T-box device installed on a truck. The collected data is clustered into five categories according to different velocity and acceleration values, representing five different driving scenes. Some characteristics that can reflect driving styles are calculated in each scene, and they are as the input of SOM+KMeans and the GMM model for driving style recognition. And the classification results of the two methods are compared in each driving scene, which has an average 91.7% recognition consistency rate. Our driving style identification model combines the characteristics of different driving scenes and can reflect the impact of road scenes on driving style. © 2022 IEEE.

关键词： Filtering Roads Clustering algorithms Safety Character recognition Vehicles

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Improved control of Grid-Connected Photovoltaic and Energy Storage System Based on Virtual Resistance 2

Improved Control of Grid-Connected Photovoltaic and Energy S...

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2nd IEEE International power Electronics and Application Symposium, PEAS 2023

作者： Kang, Jiahua Dong, Wei Xu, Jinming Diao, Hanxu Lv, Zhenhua Xie, Shaojun College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing China China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China State Grid Jiangsu Electric Power Co. LTD. Research Institute Nanjing China

ISBN: (纸本)9798350313765

In practical applications, the photovoltaic and energy storage (PV&ES) system can reduce grid-connected power fluctuations and help solve the problems caused by the large amount of distributed photovoltaic generation connected to the grid. However, the presence of non-ideal factors such as rich voltage harmonics and large grid impedance in the grid may lead to the destabilization of the PV&ES system, so analyzing the stability of the PV&ES system under complex grid is needed. The emphasis of this paper is on the modeling and stability analysis of the PV&ES system. The accurate model is established by using the harmonic linearization, and stability analysis under different grid impedances is carried out using impedance analysis. As proved, the PV&ES system has better stability under weak grid, but poor stability under strong grid with lower phase margin. Based on this, a virtual resistance-based method for improving the PV&ES system output impedance characteristics is proposed to achieve better stability under different grid impedance conditions. The validity and feasibility of the above analysis are confirmed through simulation of three-phase grid-connected inverters prototype. © 2023 IEEE.

关键词： frequency coupling impedance modeling photovoltaic and energy storage system (PV&ES) weak grid

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Research and Implementation of control Strategies for Multiple Transmission Modes in Yongren-Funing HVDC

Research and Implementation of Control Strategies for Multip...

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2022 IEEE International Conference on power systems and Electrical Technology, PSET 2022

作者： Zhu, Yukun Huang, Libin Li, Shuyong Zhu, Yihua Jia, Xuantao Jia, Xuantao State Key Laboratory of Hvdc Electric Power Research Institute China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China Southern Power Grid Guangzhou China Csg Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China Zhejiang Electric Power Co Ltd Ehv Branch Company of State Grid Hangzhou China Xj Electric Co Ltd Xuchang China

ISBN: (纸本)9781665489157

The ± 500 kV Yongren-Funing HVDC transmission project is the first HVDC whose sending and receiving ends are both located in the same province, its inverter station is required to transmit power to different AC asynchronous grids according to the different requirements of the grid operation. The present control and protection system of HVDC cannot adapt to and meet the technical requirements of multiple power transmission modes. In order to achieve this goal, the control system of HVDC must be capable of automatic discrimination and sequential control, selecting the correct strategy of reactive power control (RPC), which is essential for the stable operation of the HVDC system. Therefore, based on the operating conditions of the HVDC system and the switch configuration of the AC switch yard of the inverter station, the principle, process and interlocking conditions of automatic switching between different transmission modes are systematically analyzed. Effects on RPC, last breaker and the over voltage protection of AC busbar are researched. The control strategies for multiple transmission modes have great significance for the similar HVDC/UHVDC transmission projects in the future. © 2022 IEEE.

关键词： Reactive power

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LCA-based Multi-scenario Study on Steel or Aluminum Wheel Hub for Passenger Vehicles 30

LCA-based Multi-scenario Study on Steel or Aluminum Wheel Hu...

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30th CIRP Life Cycle Engineering Conference, LCE 2023

作者： Gao, Lu Wang, Zhihui Wang, Yanan Peng, Tao Liu, Weipeng Tang, Renzhong State Laboratory of Fluid Power and Mechatronic Systems School of Mechanical Engineering Zhejiang University Hangzhou310058 China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province Zhejiang University Hangzhou310058 China State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Zhejiang University Hangzhou310058 China School of Engineering Zhejiang University City College Hangzhou310015 China

Lightweighting is one of the enabling techniques for energy saving and carbon reduction in the automotive industry. However, the life cycle performance of lightweight components remains unclear. Wheel hub is an important component, and its trend of replacing steel with aluminum is happening. Based on life cycle assessment and using ReCiPe model, this paper reports a cradle-to-grave study on the environmental impact of steel and aluminum wheel hub in passenger vehicles. Considering multi-scenario in the Chinese market, it is found that when the service life of passenger vehicle is less than 5.6 years, steel wheel hub is more environmental-friendly, and when the service life is less than 8.6 years, steel wheel hub also has more economic advantages. Combining different lightweight methods and different types of vehicles, it is found that structural optimization reduces the environmental impact of per unit weight mostly, process optimization reduces the life cycle environmental impact of wheel hub, and using lightweight steel wheel hub in electric vehicles has more potential in environmental benefits. some suggestions are, 1) to choose wheel hub that matches your actual usage to enjoy more environmental-economic advantages;2) to prioritize structural-process integrated optimization for lightweight wheel hub;and 3) to use more lightweight components in electric vehicles. © 2023 The Authors. Published by Elsevier B.V.

关键词： Environmental impact

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A VCG Payment Scheme for Energy Storages in the Spot Market Considering Levelized-Cost-of-Storage

A VCG Payment Scheme for Energy Storages in the Spot Market ...

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power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Jianing Liu Yue Zhao Zhuo Su Ke Wang Yujun He Power Dispatching and Control Center Guangdong Province Power Grid Co. Ltd Guangzhou China State Key Lab of Control and Simulation of Power Systems and Generation Equipments Tsinghua Univeristy Beijing China

Energy storages are considered as a key solution in the novel energy system with high penetration of renewables. However, the current power markets are not designed for the participation of energy storage as it has a variable cost. This paper investigates an efficient mechanism in which the energy storage submits his levelized cost of storage, then the storage receives a Vickrey-Clark-Grove payment equal to the increase in social welfare attributable to his presence. This mechanism can encourage the storage to truthfully submit the true operating cost and thus help to optimize the system operation. Moreover, the increments of the storage’s own interests and the social welfare are coincidental, so it is incentive compatible. Numerical tests show the advantages of the proposed mechanism over the marginal pricing mechanism.

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Optimization of methane reforming for high efficiency and stable operation of SOFC stacks 17

Optimization of methane reforming for high efficiency and st...

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17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021

作者： Liu, Yaodong Lyu, Zewei Han, Minfang Department of Energy and Power Engineering State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing100084 China

ISBN: (纸本)9781607685395

Solid Oxide Fuel Cells (SOFCs) provides an efficient and clean pathway to generate electricity. In addition to hydrogen, SOFCs also hold the possibility for the utilization of a variety of carbon containing fuels. A practical kilowatt-class SOFC system fueled by methane has been preliminarily integrated previously. This study intended to obtain the optimized working conditions for the prereformer, with which the SOFC module can exhibit higher electrical performance. Detailed thermodynamic analysis and experimental measurements of steam methane reforming (SMR) were carried out under different steam to carbon ratios (S/C) and temperatures, where the experimental results matched well with the thermodynamic calculation. Based on the optimized working condition of SMR, the electrical performance and stability of a planar single-layer stack (10×10 cm2) fueled by the reformate syngas was evaluated. The maximum electrical efficiency reached 65.39% (LHV) at 750 C, and 50-hour stable operation under 50% (LHV) electrical efficiency was achieved. © 2021 Electrochemical Society Inc.. All rights reserved.

关键词： Electrical efficiency

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KPI-based Real-time Situational Awareness for power systems with a High Proportion of Renewable Energy Sources

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CSEE Journal of power and Energy systems 2022年第4期8卷 1060-1073页

作者： Tianhan Zhang Shengyuan Liu Weiqiang Qiu Zhenzhi Lin Lingzhi Zhu Zhao Dawei Minhui Qian LI Yang College of Electrical Engineering Zhejiang UniversityHangzhou 310027China Renewable Energy Research Center China Electric Power Research Institute(State Key Laboratory of Operation and Control of Renewable Energy&Storage SystemsJiangsu Engineering Technology Research Center for Energy Storage Conversion and Application)Nanjing 210003China

With the increasing complexity of power systems and the widespread penetration of renewable energy sources(RES),real-time situational awareness for power systems is of great significance for operational *** the impact of RES on power system operations,a situational awareness key performance index(KPI)system for power systems with a high proportion of RES is proposed in this paper,which consists of reserve capacity abundance,ramp resource abundance,center of inertia(COI)frequency deviation,interface power flow margin,synthesized voltage stability,and angle stability ***,the KPIs are synthesized and visualized by the decision tree method and radar chart method,respectively,for monitoring the operation states(i.e,normal,alert,and emergency states)of power systems with a high proportion of *** simulations are conducted in a revised New England 16-machine 68-bus power system and an actual CEPRI-RE power system in the northwest region of China with a high proportion of *** results show that the proposed KPI-based situational awareness method is able to accurately monitor the real-time state of power systems with a high proportion of RES,and can assist power dispatchers to make effective decisions.

关键词： High proportion of renewable energy sources(RES) key performance index(KPI) situational awareness state visualization

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Performance evolution of NI-YSZ anode-supported Sofcs during initial-stage operation 17

Performance evolution of NI-YSZ anode-supported Sofcs during...

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17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021

作者： Lyu, Zewei Han, Minfang Department of Energy and Power Engineering State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing100084 China

ISBN: (纸本)9781607685395

Performance evolution of typical Ni-YSZ anode-supported SOFCs during the initial-stage operation ( 20 h), regardless of the operating current. In the activation stage, the cell performance maintains stable or slightly increases due to the enhanced anode gas-phase diffusion. While in the subsequent aging stage, the cell performance decreases significantly and gradually approaches a plateau in about 100 hours, mainly due to the weakened anode charge transfer reaction and ionic transport processes. Therefore, it is suggested that more efforts should be focused on improving the stability of anode microstructure, especially the stability of anode functional layer. © 2021 Electrochemical Society Inc.. All rights reserved.

关键词： Chemical activation

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Research on Active Participation of Distributed Photovoltsics in power Grid Primary Frequency control Strategy

SSRN

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SSRN 2024年

作者： Zhang, Runtao Wang, Lei Zeng, Siming Cheng, Ziwei Su, Can Li, Zhiwei Zhang, Hao State Grid Hebei Electric Power Research Institute Shijiazhuang China Hebei Key Laboratory of Simulation Modeling and Control for Energy Internet Shijiazhuang China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Baoding071003 China

Distributed photovoltaic systems can actively contribute to the primary frequency regulation of the power grid by reserving capacity. Traditional power reduction methods often employ fixed load reduction ratios, potentially resulting in inadequate frequency regulation capacity and unnecessary reserve power. This paper centers on optimizing power reserve control, starting with the construction of a two-stage model for a photovoltaic grid-connected inverter power generation system. It includes the design of a maximum power estimation method and the implementation of photovoltaic power reduction operation. The article proposes a strategy to utilize photovoltaic backup capacity for achieving primary frequency modulation effects in a short time scale. Additionally, it adopts a variable power reserve ratio operation strategy over the long term, aiming to enhance photovoltaic power generation and optimize solar energy utilization without compromising the grid's frequency and quality. Finally, a MATLAB/Simulink model is developed to validate the effectiveness of the control strategy. simulation results indicate that the proposed strategy satisfies frequency regulation requirements, enhances power generation efficiency, and improves the economic viability of photovoltaic operations. © 2024, The Authors. All rights reserved.

关键词： Frequency modulation

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Over-voltage Analysis of High Penetration PV Integration to Distribution Network Considering Whole-County-PV Development 2

Over-voltage Analysis of High Penetration PV Integration to ...

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2nd International Conference on Electronic Materials and Information Engineering, EMIE 2022

作者： Han, Zhaoyang Zhao, Qianyu Wang, Shouxiang Dong, Yichao Mu, Hao Ministry of Education Nankai District Tianjin300072 China Tianjin Key Laboratory of Power System Simulation Control Nankai District Tianjin300072 China State Grid Tianjin Electric Power Company Hebei District Tianjin300000 China

ISBN: (纸本)9781713865629

The whole county photovoltaic (PV) development will have an impact on the voltage level of the distribution network due to high penetration of PVs. Firstly, the mechanism of distributed PV to raise voltage level is explored. Then, based on Monte Carlo simulation, the analysis method of the influence of PV configuration uncertainty on voltage is proposed. Finally, the back/forward power flow calculation is adopted, taking a 10kV 88-node feeder in Jiangsu as an example. The voltage level under the current condition, the voltage level after adding planned PV capacity and the maximum PV hosting capacity are calculated and analyzed, which provides reference for the promotion of whole-county-PV development in China. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Electric power distribution

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