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Will Coal Price Fluctuations Affect Renewable Energy Substitution and Carbon Emission? A Computable General Equilibrium-Based Study of China

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Energy Engineering 2021年第4期118卷 1009-1026页

作者： Wenhui Zhao Yibo Yin Lu Mao Konglu Zhong Guanghui Yuan Hai Huang Yige Yang College of Economics and Management Shanghai University of Electric PowerShanghai200090China Zhejiang Electric Power Construction Co. Ltd.Ningbo315000China Zhejiang Huayun Electric Power Engineering Design Consulting Co. Ltd.Hangzhou310014China Fintech Research Institute&School of Information Management and Engineering Shanghai University of Finance and EconomicsShanghai200433China State Key Joint Laboratory of Environment Simulation and Pollution Control(SKLESPC) School of EnvironmentTsinghua UniversityBeijing10084China State Grid Integrated Energy Planning and D&R Institute Beijing10084China

Changes in the energy price system will determine the direction of evolution of the energy industry *** a country where coal is the dominant energy source,what is the effect of coal price fluctuations on China’s industry development costs and energy consumption structure?To investigate this problem,this paper utilized an economy–energy–environment computable general equilibrium *** this study,four aspects were analyzed:Energy supply side,proportion of renewable energy consumption,macroeconomy,and changes in CO_(2) *** results of this study show that an increase of 10%–20%in coal prices contributes to a shift into using renewable energy,which leads to energy saving and emission *** energy and clean energy rose by 0.57%–4.47%in the energy structure,but this has a certain negative impact on the *** gross domestic product(GDP)fell by 0.07%–0.18%.As a result,the decline in coal prices became an obstacle to renewable energy substitution and energy *** addition,we put forward policy suggestions according to the results in energy,economic,and environmental effects.

关键词： Coal price computable general equilibrium multi-scenario simulation renewable energy

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Configuration Strategy for Flexible Resources with Resilience Enhancement of the Distribution system against Typhoon Disaster

Configuration Strategy for Flexible Resources with Resilienc...

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Sustainable power and Energy Conference (iSPEC)

作者： Wang Yushan Zhang Feng Zhou Ziqing Wang Xu Jiang Chuanwen Key Laboratory of Power Transmission and Power Conversion Control Shanghai Jiao Tong University Shanghai China Electricity Market Simulation Laboratory State Grid Zhejiang Electric Power Research Institute Zhejiang China

ISBN: (纸本)9781665414401

The typhoon disaster has severely challenged the reliability of a distribution system. Considering the impacts of typhoon’s temporal and spatial evolution on the operation states of distribution lines, a stochastic optimization method based on scenario probability is proposed to conFigure the photovoltaic and energy storage devices considering resilience enhancement. Firstly, the distribution network is gridded geographically, with a spatiotemporal evolution directions and model of the typhoon disaster established based on the meteorological information. Considering one possible typhoon route scenario and its corresponding probability, the optimal configuration problem under such scenario is solved by minimizing the expected economic loss caused by the typhoon. Finally, a modified IEEE33-node distribution system with the historical photovoltaic power data from a certain area, is utilized to analyze the resilience enhancement of the distribution system.

关键词： Photovoltaic systems Tropical cyclones Stochastic processes Distribution networks Load shedding Loss measurement Spatiotemporal phenomena

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Longitudinal Protection Method based on Voltage Waveform Comparison for AC / DC Hybrid system

Longitudinal Protection Method based on Voltage Waveform Com...

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2020 IEEE/IAS Industrial and Commercial power system Asia, I and CPS Asia 2020

作者： Zhang, Hongzhe Cong, Wei Kong, Hao Chen, Ming Wei, Zhen Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Ministry of Education Jinan China Qingdao Power Supply Company State Grid Shandong Electric Power Company Qingdao China

ISBN: (纸本)9781728143033

When the tie line of the AC/DC hybrid system fails, the change of the electrical quantity on the inverter side is different from that of the traditional infinite AC power source. Sensitivity and reliability of traditional relay protection methods will be affected. A longitudinal protection method for AC / DC hybrid system based on voltage waveform comparison is proposed. The method bases on the conclusion that the waveform characteristics of the reference voltage and the measuring voltage are different in the case of internal and external faults, roughly determine the fault location through the Pearson correlation coefficient. Use longitudinal protection logic to give more accurate judgment results. The simulation results of PSCAD model show that the scheme in this paper can accurately identify the fault of the tie line of the AC/DC hybrid system, and has high reliability and good applicability. © 2020 IEEE.

关键词： Correlation methods

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Multi-mode collaborative voltage control strategy for low-voltage flexible interconnection systems

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International Journal of Electrical power & Energy systems 2025年 169卷

作者： Weiru Wang Sheng Zhang Dan Pang Zhipeng Wang Yechun Xin Yanxu Wang Wei Wang Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin 132012 China State Grid Jilin Electric Power Co. Ltd. Changchun Power Supply Company Changchun 130021 China

Distributed generators (DG) exhibit output volatility, and their connection locations are unevenly distributed. The high proportion and large-scale integration of DG into low-voltage distribution networks can lead to voltage violations at line terminals and uneven feeder loads. In this paper, a flexible interconnection distribution network is constructed based on Intelligent Soft Open Points (SOP), where the operation modes of the flexible interconnection system are classified, the power transfer relationships are outlined, and the voltage violation mechanisms are analyzed. A multi-mode collaborative voltage control scheme for low-voltage flexible interconnection systems is proposed. The distribution network operation modes are classified based on the inherent voltage levels at the ends of each feeder and the load status of the main transformer. By integrating the internal energy storage system of the SOP, a multi-mode collaborative voltage control strategy based on SOP is proposed. This strategy can simultaneously manage voltage violations at the terminals of interconnected distribution lines and achieve load balancing control, with the flexibility to be applied to multi-terminal flexible interconnection scenarios. The feasibility and effectiveness of the proposed control strategy are validated through a simulation model of the constructed flexible interconnection distribution network.

关键词： Low-voltage distribution network Soft open point Flexible interconnection Hybrid energy storage Voltage overlimit

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碱金属离子诱导亚稳相钌纳米晶合成

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Science Bulletin 2023年第23期68卷 2924-2928,M0004页

作者：张俊涛刘效知陈立刚曹茂丰李晓彤苏东胡志伟徐勇黄小青 State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China State Power Investment Corporation Hydrogen Energy Company Limited Beijing 102209China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Max Planck Institute for Chemical Physics of Solids Dresden 01187Germany

亚稳相金属纳米晶因其优异的物理化学性质备受关注,然而如何可控合成亚稳相结构依然面临诸多挑战.本文报道了碱金属离子诱导亚稳相钌纳米晶(面心立方相)的可控合成策略.研究表明钌纳米晶结构和碱金属离子半径密切相关,因此通过改变碱金... 详细信息

亚稳相金属纳米晶因其优异的物理化学性质备受关注,然而如何可控合成亚稳相结构依然面临诸多挑战.本文报道了碱金属离子诱导亚稳相钌纳米晶(面心立方相)的可控合成策略.研究表明钌纳米晶结构和碱金属离子半径密切相关,因此通过改变碱金属离子实现了面心立方相和六方密堆相比例的连续调控.理论计算结果表明,碱金属的存在导致面心立方相的形成能低于六方密堆相,并且这种能量差随着碱金属离子半径的增大而增大.本工作为拓展亚稳态结构的实际应用奠定了基础.

关键词：亚稳相碱金属离子面心立方纳米晶结构金属纳米晶物理化学性质可控合成钌

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Learning Pre-Grasp Manipulation of Flat Objects in Cluttered Environments using Sliding Primitives

Learning Pre-Grasp Manipulation of Flat Objects in Cluttered...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Jiaxi Wu Haoran Wu Shanlin Zhong Quqin Sun Yinlin Li State Key Laboratory of Turbulence and Complex Systems Intelligent Biomimetic Design Lab College of Engineering Peking University Beijing China Department of Automation University of Science and Technology of China Heifei China State Key Laboratory of Management and Control for Complex System Institute of Automation Chinese Academy of Science Beijing China Science and Technology on Thermal Energy and Power Laboratory Wuhan China

Flat objects with negligible thicknesses like books and disks are challenging to be grasped by the robot because of the width limit of the robot's gripper, especially when they are in cluttered environments. Pre-grasp manipulation is conducive to rearranging objects on the table and moving the flat objects to the table edge, making them graspable. In this paper, we formulate this task as Parameterized Action Markov Decision Process, and a novel method based on deep reinforcement learning is proposed to address this problem by introducing sliding primitives as actions. A weight-sharing policy network is utilized to predict the sliding primitive's parameters for each object, and a Q-network is adopted to select the acted object among all the candidates on the table. Meanwhile, via integrating a curriculum learning scheme, our method can be scaled to cluttered environments with more objects. In both simulation and real-world experiments, our method surpasses the existing methods and achieves pre-grasp manipulation with higher task success rates and fewer action steps. Without fine-tuning, it can be generalized to novel shapes and household objects with more than 85% success rates in the real world. Videos and supplementary materials are available at https://***/view/pre-grasp-sliding.

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SOC balancing strategy for parallel-connected power conversion system based on PQ decoupling control

SOC balancing strategy for parallel-connected power conversi...

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20th International Conference on AC and DC power Transmission 2024 (ACDC 2024)

作者： Ziyi Xiong Aizuo Chen Yanglin Zhou Jinyu Wang Song Ci Department of Electrical Engineering Tsinghua University Beijing 100084 People's Republic of China State Key Laboratory of Power System Operation and Control Tsinghua University Beijing 100084 People's Republic of China School of Electrical Engineering Xi'an Jiaotong University Xi'an 710000 People's Republic of China

ISBN: (数字)9781837241552

Nowadays the battery energy storage system (BESS) plays a significant role in power grid due to its excellent function in energy regulation. In most cases, BESS connects to the power grid through power Conversion system(PCS). However, the state of charge (SOC) of different battery modules tend to be different during the working process. The difference bet ween SOC would intensify buckets effect, and the performance of BESS would be degraded due to the abnormal feature (low SOC) of single battery cell. To avoid such shortcoming, it is necessary to eliminate the difference of SOC though control strategy. In this paper, we propose a SOC balancing strategy for parallel-connected power conversion system based on PQ decoupling control, which can also adjust the active power output of each battery module converge to optimization solution. simulation and experimental results from a 2 × 700V, parallel-connected power converter system are presented in order to validate the method.

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Exergy Analysis of Electric Vehicle Heat Pump Air Conditioning system with Battery Thermal Management system

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Journal of Thermal Science 2020年第2期29卷 408-422页

作者： ZHANG Kexin LI Ming YANG Changhai SHAO Zhiyuan WANG Lihong State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130025China College of Automotive Engineering Jilin UniversityChangchun 130025China School of Energy and Power Engineering Xi’an Jiaotong UniversityXi’an 710049China FAW-Valeo Climate Control Systems Co.Ltd. Changchun 130011China

The exergy analysis of an electric vehicle heat pump air conditioning system(HPACS) with battery thermal management system was carried out by studying the exergy loss of each component. The results indicate that the compressor is the main source of system exergy loss in all operation conditions. The exergy loss distribution of HPACS is almost the same when the battery thermal management system integrated into the HPACS in cabin and battery mixed cooling mode and the system exergy loss was linearly related to the compressor speed in cooling modes. The performance of the HPACS is better than that of the positive temperature coefficient(PTC) heater in cabin heating mode. The degree of exergy efficiency improvement of the alternative mode was discussed at all operation conditions in cabin heating mode. The results indicate that the optimization effect using the electric vehicle HPACS to replace the PTC heater is obvious at lower compressor speed, surrounding temperature and internal condenser air flow rate.

关键词： electric vehicle heat pump exergy efficiency battery thermal management

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Research on the Impact of Water-Ingression Defects on the Electromagnetic-Thermal Fluctuation and Heat Distribution Characteristics of High Voltage Cable Terminals

SSRN

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SSRN 2023年

作者： Liu, Xingmou Yang, Hui Xu, Qiqi Lin, Haibo Yang, Yongming Jadoon, Ammad Chongqing Key Laboratory of Complex Systems and Bionic Control Chongqing University of Posts and Telecommunications Chongqing400065 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology School of Electrical Engineering Chongqing University Chongqing University Chongqing400044 China NFC-Institute of Engineering &Technology Multan Pakistan

High voltage cable terminals (HVCT) usually work outdoors with water-ingression defect which affects the normal operation of the power system. This paper presents the study of the influence of different water-ingression depth on the temperature distribution of HVCT. Firstly, the model of EM-thermal-fluid coupling field of HVCT was established using finite element method in line with the structural parameters of YJZWC4 HVCT. Subsequently, the effectiveness of the model is then verified by comparing the operation of the model under the actual HVCT. And then, the analysis results of temperature show that the surface temperature of the HVCT at the inlet part is significantly higher than that of the insulating oil part. And The influent depth is positively correlated with surface temperature and temperature gradient. The distortion of the electric field will be more serious due to the deepening of the depth of the inlet water. Finally, the variation of temperature and field strength with the depth of inlet water is summarized by mathematical fitting method. The research results accurately reflect the electromagnetic thermal characteristics of the HVCT under the influent state and provide a reliable technical means for the state prediction and fault diagnosis of the cable terminals. © 2023, The Authors. All rights reserved.

关键词： Atmospheric temperature

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Unleashing the flexibility of renewable-dominated distribution grids via soft open point planning

Unleashing the flexibility of renewable-dominated distributi...

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2020 IEEE power and Energy Society General Meeting, PESGM 2020

作者： Zhang, Tiance Wang, Jianxiao Li, Gengyin Zhou, Ming Zhao, Dejie Cui, Da North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing China National Power Dispatching and Control Center State Grid Corporation of China Beijing China

ISBN: (纸本)9781728155081

With an increasing integration of intermittent distributed energy resources (DERs), the consequent voltage excursion and thermal overloading issues limit the self-sufficiency of distribution networks (DNs). The concept of soft open point (SOP) has been proposed as a promising solution to improve the hosting capacity of DNs. In this paper, we propose an optimal planning framework for SOPs and DERs while considering building-to-grid (BtG) capability. The optimal planning model is aimed at minimizing the investment and operation costs while respecting various constraints, including the self-sufficiency requirement of the DN, SOP and DER operation, etc. A steady-state SOP model is formulated and linearized to be incorporated into the planning framework. To make full use of the BtG flexibility provided by ubiquitous buildings, a differential equation model for building thermal dynamics is formulated. IEEE 33-bus feeder is adopted to validate the effectiveness of the proposed framework and method. Case studies show that SOP / BtG can effectively improve the hosting capacity and self-sufficiency of distribution networks. © 2020 IEEE.

关键词： Investments

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