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2017 IEEE Conference on Energy Internet and Energy system Integration, EI2 2017

作者： Li, Hao Zhang, Hengxu Xu, Qun Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan250061 China Qingdao Power Supply Company State Grid Shandong Electric Power Company China

ISBN: (纸本)9781538614273

Micro synchronous generation unit is a laboratory scale equipment to model the realistic behavior of a real generator set, control of which determines the operating state of the simulation system directly. This paper presents an integrated control instrument for micro synchronous generator (ICIMSG). ICIMSG integrates signal processing unit and power amplifying unit, realizing control functions such as generator starting and braking, automatic frequency regulation, automatic generator-voltage control (AVR) and automatic quasi-synchronizing paralleling. Light synchronized phasor measurement unit (PMU Light) is employed to monitor the generator set. Real-time operation information including frequency, voltage phasor and current phasor can be sent from PMU Light to ICIMSG through the internet. Appropriate software was developed on server to communicate with ICIMSG in a two-way manner through WiFi network. ICIMSG's real-time control and analysis capabilities provide a platform not only for innovative research ideas, but also for teaching general power system engineering concepts to students via physical experiments. All functions of ICIMSG proposed were tested on physical micro synchronous generator sets. © 2017 IEEE.

关键词： Synchronous generators

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Fully vaporized electrical explosion of bare tungsten wire in vacuum

Fully vaporized electrical explosion of bare tungsten wire i...

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The 2nd International Conference on Matter and Radiation at Extremes(ICMRE 2017)

作者： Huantong Shi Xiaobing Zou Xinxin Wang Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power System and Generation EquipmentTsinghua University

A flashover switch inserted between the cathode and wire end was used to enhance the deposition energy into an exploding wire in *** was found that the flashover switch plays two roles:the first one is reducing the rise time of the current pulse,the second and more important one to greatly improve the surface radial electric field and suppress the electronic emission that is responsible for triggering the surface breakdown of the exploding *** the second one takes effect and results in much higher energy deposition only with the flashover switch on the *** this case,the deposition energy was increased by ~three times（3.4eV/atom vs.12eV/atom） under negative current pulse and by ~two times（5.7eV/atom vs.13eV/atom） under a positive one,and fully vaporized wire core was observed with laser interferometry.

关键词： electrical explosion of wire flashover switch energy deposition

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Concept and Analysis of Discrete Energy Internet

Concept and Analysis of Discrete Energy Internet

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IEEE Conference on Energy Internet and Energy system Integration

作者： Fang Zhang Lin Cheng Song Ci Renle Huang Cunping Wang State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University State Grid of China Beijing Electric Power Company

ISBN: (纸本)9781538614280

The future power system will be the integra-tion of multiple energy systems, cyber-physical system, and multiple markets. This paper presents an architecture of energy-discretized multi-energy microgrids. This architecture can achieve the point-to-point (P2P)transmission of discrete energy with the physical system level, which solves the problem of energy flow tracking and measurement. In this architecture, the real-time transaction-and-control-combined mechanism can ensure the dynamic and fully customized energy supply. This paper draws the architecture of a new generation of energy supply system, and may provide an idea for the integration of energy, information, and value in energy supply system.

关键词： Cyber-Physical system Energy Internet Multi-energy microgrids Discrete energy internet Synchronized measurement and control

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Economic analysis of multi-energy virtual power plant considering market information

Economic analysis of multi-energy virtual power plant consid...

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2017 IEEE Conference on Energy Internet and Energy system Integration, EI2 2017

作者： Wang, Jiazhen Shen, Xinwei Guo, Qinglai Xiong, Wen Tang, Lei Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen Insitute Tsinghua University Shenzhen China State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China Guangzhou Power Grid Company Guangzhou Lei Tang Beijing Qingda Gaoke System Control Company Beijing China Beijing Qingda Gaoke System Control Company Beijing China

ISBN: (纸本)9781538614273

Integrated Energy system is beneficial for promoting the distributed renewable energy (DRE) consumption, thereby alleviating environmental pollution and energy shortage. In this paper, we propose a virtual power plant (VPP) structure considering the feature of heat and electric power system integration, which is defined as Multi-energy Virtual power Plant (MVPP). MVPP is allowed to participate in the electricity market;and price information from bulk power market can affect heating system through the coupling devices, thus optimizing the co-operation of electric and heat system. MVPP is also involved in the auxiliary service market, a penalty term is designed for the Utility to charge MVPP service fee so that power fluctuation on transmission line can be reduced. The case study proved the effectiveness of the penalty term and MVPP is able to provide reserve service for Utility in peak load hours by multi-energy flow coupling under the regulation of feed-in tariff. © 2017 IEEE.

关键词： Virtual power Plants

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Wind-CHP generation aggregation with storage capability of district heating network

Wind-CHP generation aggregation with storage capability of d...

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2017 IEEE Conference on Energy Internet and Energy system Integration, EI2 2017

作者： Yu, Jing Shen, Xinwei Sheng, Tongtian Sun, Hongbin Xiong, Wen Tang, Lei Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen Institute Tsinghua University Shenzhen China State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China Guangzhou Power Grid Company Guangzhou China Beijing Qingda Gaoke System Control Company Beijing China

ISBN: (纸本)9781538614273

The strong coupling of electricity and heat of combined heat and power (CHP) unit in cold season results in the loss of flexibility, which may cause massive wind power curtailment if they are in the same system. This issue could be handled with the thermal storage capability of a district heating network (DHN) that could supply flexibility for CHP to decouple the strong coupling of heat and electric power supplies. In this paper, a wind-CHP generation aggregation(WCGA) model is formulated, which motivates CHP to increase wind power integration by increasing total profit of the system, while considering the additional flexibility supplied by DHN. In WCGA model, DHN is formulated as an energy-storage-like (ESL) model that considers the storage capability of DHN based on dynamic characteristics of temperature and time delay effect of DHN. The potential benefits of the proposed model have been demonstrated by case study in terms of enhancing, wind power integration as well as total profit. © 2017 IEEE.

关键词： District heating

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A Transformer Fault Diagnosis Method Based on Bayesian Network

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Journal of Physics: Conference Series 2019年第5期1213卷

作者： Zhang Zhe-wen Wang Yong Ying Ding Tian lei Zhou Ying-jian Key Laboratory of Power System Intelligent Dispatch and control of Ministry of Education (Shandong university) Jinan 250061 Shandong Province China +*** Key Laboratory of Power System Intelligent Dispatch and control of Ministry of Education (Shandong university) Jinan 250061 Shandong Province China State Grid of China Technology College Jinan 250002 Shandong Province China State Grid Shandong Electric Power Company Finance Department Jinan 250001 Shandong Province China

This paper summarizes the fault types and fault hazards of the transformer, and combs the corresponding relationship between the transformer fault types and the fault symptoms, which provides reference for the transformer fault diagnosis and state maintenance. Based on the analysis of the existing transformer fault diagnosis, the transformer fault diagnosis based on Bayesian network is mainly studied. Bayesian network has advantages in machine learning, data reasoning and so on. It has been widely applied in the field of fault diagnosis. In this paper, the QMR model of transformer fault diagnosis is established by using the principle of Bayesian network and the relationship between fault type and fault feature, and the model is used to diagnose the specific fault. Then the paper further analyzes the result of fault diagnosis in order to prove the correctness and validity of Bayesian network.

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An Internet of Energy Things Based on Wireless LPWAN

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Engineering 2017年第4期3卷 460-466页

作者： Yonghua Song Jin Lin Ming Tang Shufeng Dong State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University. Beijing 100084 China College of Electrical Engineering Zhejiang University Hangzhou 310027 China Center of Internet of Energy Things Tsinghua-Sichuan Energy Internet Institution Chengdu 610213 China

Under intense environmental pressure, the global energy sector is promoting the integration of renewable energy into interconnected energy systems. The demand-side management （DSM） of energy systems has drawn considerable industrial and academic attention in attempts to form new flexibilities to respond to variations in renewable energy inputs to the system. However, many DSM concepts are still in the experimental demonstration phase. One of the obstacles to DSM usage is that the current information infrastructure was mainly designed for centralized systems, and does not meet DSM requirements. To overcome this barrier, this paper proposes a novel information infrastructure named the lnternet of Energy Things （IoET） in order to make DSM practicable by basing it on the latest wireless communication technology： the low-power wide-area network （LPWAN）. The primary advantage of LPWAN over general packet radio service （GPRS） and area Internet of Things （loT） is its wide-area coverage, which comes with minimum power consumption and maintenance costs. Against this background, this paper briefly reviews the representative LPWAN tech- nologies of narrow-band Internet of Things （NB-IoT） and Long Range （LORa） technology, and compares them with GPRS and area IoT technology. Next, a wireless-to-cloud architecture is proposed for the IoET, based on the main technical features of LPWAN. Finally, this paper looks forward to the potential of IoET in various DSM application scenarios.

关键词： Low-power wide-area network Internet of Things Narrow-band lnternet of Things LoRa technology Demand-side management

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Progress of the 4 K-class Vuilleumier type cryocooler and its further applications

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IOP Conference Series: Materials Science and Engineering 2020年第1期755卷

作者： J Wang C Z Pan T Zhang K Q Luo X T Xi L B Chen Y Zhou J J Wang CAS Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry Beijing 100190 China University of Chinese Academy of Science Beijing 100049 China Laboratoire national de métrologie Et d'essais-Conservatoire national des arts et métiers (LNE-Cnam) F-93210 La Plaine France State Key Lab of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing 100084 China

Vuilleumier cycle was first patented in 1918. It was usually regard as the thermal-driven Stirling refrigeration cycle, which combined the low-frequency working pattern like Giffod-Mcmahon (GM) cryocooler and the compactness of Stirling-type cryocooler. With the continuous development in the past 100 years, the Vuilleumier-type (VM-type) cryocoolers have to been proved to generate cooling power from ambient temperature to liquid nitrogen temperature and even to liquid helium temperature. In recent decades, some efforts were made on traditional displacer-type VM cryocooler, Vuilleumier hybrid pulse tube cryocooler (VM-HPTC) and the VM-type pulse tube cryocooler (VM-type PTC) to obtain the liquid helium temperature. Successfully, not only the 4 K was obtained, but also the limit temperature of oscillating cryocooler by He4 was hit. This paper presents the progress of the 4 K-class VM-type cryocooler and analyzed the possible applications of 4 K class VM-type cryocooler.

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Optimal Configuration of Large-Scale Storage Energy Access to Actual power Grid with High Wind power Proportion

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IOP Conference Series: Earth and Environmental Science 2019年第6期237卷

作者： T Yan M X Zhang X F Song C X Li H Sheng B Z Liu State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Haidian District Beijing 100192 China State Grid Xinjiang Electric Power Company Economic Research Institute Urumqi 830011 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China

In order to solve the problem of abandoned wind power in new energy high permeability grid, a large-scale energy storage device optimization configuration algorithm is proposed. At the same time, the energy storage cost, the abandonment cost and the loss of load cost are taken into consideration, and an optimization model is established considering various operational constraints and solved through the mature commercial software CPLEX. Finally, the 750kV system obtained by the actual grid equivalent is taken as an example to obtain an optimal configuration scheme for energy storage in the actual power grid.

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A New power Flow Algorithm for Hybrid AC/DC power Grid

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Journal of Physics: Conference Series 2019年第3期1213卷 032027-032027页

作者： Li, Jiawei Han, Xueshan Li, Wenbo Jiang, Zhe Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan China. State Grid Shandong Electric Power Research Inxititute Jinan 250003 Shandong Province China.

Aiming at the problem of grid power flow calculation with VSC (Voltage Source Converter) unit in the context of the energy internet, this paper presents a new converter equivalent model. This study introduces a novel unified power flow algorithm for hybrid AC/DC power grids. The method simplifies the converter model by means of equivalent substitution and power conversion. The model better inherits the advantages of traditional AC power flow calculation. Finally, a unified iterative method is used to calculate an IEEE-57 node.

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