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2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Sun, Tong Wang, Bin Dong, XinZhou Zhang, ShuJian Kang, MingCai Cao, RunBin School of Automation Nanjing University of Science and Technology Nanjing Jiangsu 210094 China State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China Electrical Engineering and Automation Hefei University of Technology Hefei Anhui 230009 China

ISBN: (纸本)9781424496198

According to the demand of 126kV intelligent switch with intelligent operative box, an intelligent terminal device by using cooperation control of embedded CPU (STM32F103ZET6 ARM) and Field Programmable Gates (Cyclone II EP2C8Q208C8 FPGA), which is up to the IEC61850 standard, is designed in this paper. Research program of the device is discussed. Starting from the modularization structure design, function of each module, circuit design and implementation method were introduced in detail. A hardware platform was established according to the design. Finally, the article confirmed the correctness of the hardware platform primarily through experimental method. © 2011 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Optimal power and energy sizing of compressed air energy storage in distribution network using multiparametric programming 5

Optimal power and energy sizing of compressed air energy sto...

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5th International Conference on Energy Engineering and Environmental Protection, EEEP 2020

作者： Chen, Fan Guo, Zhongjie Lin, Qiyou Xue, Xiaodai Xie, Yuguang Mei, Shengwei State Grid Anhui Electric Power Research Institute Hefei230601 China State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing100084 China State Grid Wuhu Electric Power Supply Company Wuhu241027 China

As a new type of mechanical energy storage, compressed air energy storage (CAES) has attracted wide attention in recent years. This paper studies the optimal sizing problem of CAES in power distribution network (PDN). CAES plays a role in shaving the peak and filling the valley at demand side and thus reduces the operation cost of PDN to purchase electricity from the main grid. A multi-parametric linear programming (MP-LP) model is formulated where the power and energy capacities of CAES are regarded as parameters;the parameterized optimal value function (OVF) provides a graphical tool to describe the impact on operation cost of CAES configuration, which helps determine the planning strategy in a visual manner. The visualized results reveal not only the optimal solution, but also some useful information, like the sensitivity of operation cost to parameters. Case studies conducted on the IEEE 33-bus distribution system verifies the effectiveness of the proposed method. © Published under licence by IOP Publishing Ltd.

关键词： Linear programming

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EQUIVALENT CAPACITY OF THE LOWER VOLTAGE RIDE THROUGH FOR WIND FARM FROM OVERCURRENT PROTECTION IN power COLLECTION LINES

EQUIVALENT CAPACITY OF THE LOWER VOLTAGE RIDE THROUGH FOR WI...

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IET International Conference on Developments in power System Protection

作者： Bin Wang Xinzhou Dong Zhiqian Bo State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Alstom Grid

ISBN: (纸本)9781622761050

Magnitude and duration of voltage sags are the most important two factors to the Lower Voltage Ride Through (LVRT) capacity of the wind generator. Since most voltage sags are caused by the system faults, and sag durations are controlled by the tripping time of overcurrent relay in power collection lines based on the sags' magnitude. The specification of the LVRT capacity of wind generator is introduced into the operation characteristics of the relay in power collection lines. The evaluation model of equivalent LVRT capacity to overcurrent protection is proposed in paper, and the equivalent LVRT capacities from zone I and zone II relay are quantified. Improvement measures are also proposed.

关键词： Wind Farm Lower Voltage Ride Through Overcurrent Protection power collection lines

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Research on generation and execution of coordination strategy for bi-directional and interactive coordinated voltage control between provincial and district levels

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Dianwang Jishu/power System Technology 2013年第12期37卷 3426-3432页

作者： Wang, Bin Guo, Qinglai Sun, Hongbin Li, Haifeng Luo, Jianyu Zhang, Boming Wu, Wenchuan State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China Jiangsu Electrical Power Dispatching and Control Center Nanjing 210024 Jiangsu Province China

To achieve the goal of bi-directional and interactive coordinated voltage control between provincial and district levels, the study is focused generation and execution of coordination strategy for bi-directional and interactive coordinated voltage control between provincial and district levels. Firstly, the method to generate the bi-directional and interactive coordination strategy between provincial and district levels is proposed, and the gateway coordination state transition diagram is designed to intuitionally express the criterion of the interaction between the AVC systems belonging to the upper and lower level systems respectively;then, the regularization method for expanded coordinated secondary voltage control suitable to provincial power network and the regularization method suitable to district power network are put forward respectively to realize mutual support between power networks in provincial level and district level. Results from simulation examples and on-site operations show that the proposed method is feasible and effective as well.

关键词： Electric power transmission networks

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power transformer condition assessment by on-line monitoring and trend analysis

Power transformer condition assessment by on-line monitoring...

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IASTED International Conference on power and Energy systems and Applications, PESA 2012

作者： Xie, Qijia Gao, Shengyou Zhang, Hailong Dai, Wen Ruan, Ling Nie, Dexin Lu, Wenhua Key Laboratory of High-Voltage Field-Test Technique of SGCC Hubei Electric Power Testing and Research Institute Wuhan China State Key Lab of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing China State Grid Electric Power Research Institute Wuhan China School of Electrical Engineering Wuhan University Wuhan China

power transformer condition assessment is the basi of condition-based maintenance and plays a very important role in carrying assets management and risk assessment for power system. As the heart of transmission and transformation system, power transformer's condition has close relation with many factors, such as the production quality of itself, operation environment and so on. This paper analyzes some variables which could represent the transformer's condition, including the data from preventative test, factory test and commission test, diagnostic test, on-line detection and monitoring, routine inspection, operation history, family defection and environment information. Some parameters which have representation are chosen as the condition variables. Artificial neuron network (ANN) and Dempster-Shafer (D-S) evidence theory are adopted to form the multiparameter information fusion condition assessment model. Besides the static value, the change trends of some parameters are considered as an independent evidence section. Cooperating with on-line monitoring, it will be helpful to improve the accuracy and efficiency of condition assessment.

关键词： power transformers

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Comparison of Two Basic Structures in Magnetically-Coupled Resonant Wireless power Transfer

Comparison of Two Basic Structures in Magnetically-Coupled R...

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第十五届中国科协年会

作者： ZHANG Yiming ZHAO Zhengming CHEN Kainan State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

Wireless power transfer (WPT) has been a research focus in recent *** on magnetically-coupled resonant wireless power transfer (MCR-WPT),this paper made a comparison of 2 basic structures in MCR-WPT,namely the 2-coil structure and the 4-coil *** equivalent electric circuits were *** illuminate the difference between these 2 structures,the input impedance,the transfer efficiency,and the load matching were studied and verified by experimental *** conclusion can be drawn that without reducing the transfer efficiency,the additions of the source coil and the load coil in the 4-coil structure make it easier for the system to perfectly match the source and the load.

关键词： wireless power transfer magnetic resonance comparison structure

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A Corrective control Approach For Combined Heat And power System integrated with Multiple Energy Storage System

A Corrective Control Approach For Combined Heat And Power Sy...

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Lin, Qunli Shen, Xinwei Sun, Yong Li, Zhenyuan Guo, Qinglai Sun, Hongbin Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen Insitute Tsinghua University Shenzhen China State Grid Corp. of China Jilin Power Grid Company Jilin China State Key Lab. of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing China

ISBN: (纸本)9781728135205

The integrated Energy System (IES) becomes very important nowadays, however, the coupling between multiple energy systems will bring new challenges to the security control of the IES, such as combined heat and power (CHP) system. The corrective control means that the operations can be adjusted after contingency happens to eliminate the constraints violation in the contingency state such as the transmission outage or generator outage. This paper proposes a corrective control approach for CHP system integrated with the energy storage system based on security constrained economic dispatch (SCED) model. Case studies based on the IEEE 9-bus CHP system are presented to verify the method. The case result shows that the energy storage device can solve the ramping of the unit's output adjustment well. The corrective control method is more scientific and economical. © 2019 IEEE.

关键词： Outages

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IEC61850-based information modeling of 126KV intelligent terminals

IEC61850-based information modeling of 126KV intelligent ter...

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2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Zhang, Shu-Jian Wang, Bin Sun, Ming Dong, Xin-Zhou Sun, Tong Cao, Run-Bin Electrical Engineering and Automation Hefei University of Technology Baohe District Hefei 230009 China State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China School of Automation Nanjing University of Science and Technology Nanjing Jiangsu 210094 China

ISBN: (纸本)9781424496198

The stability and reliability of the intelligent terminal's receiving information affects its control of intelligent switch in operation directly. To achieve reliable intelligent communications terminals, with techniques and methods of IEC61850 modeling, the paper completed the 126KVGIS intelligent terminal information model based on the analysis of its information characteristics, and established the hardware platform with data model and logical nodes provided by IEC61850. Thus it has a certain practical significance to promote the standard construction, operation and management of intelligent substation, and lead the digital process of process layer devices. © 2011 IEEE.

关键词： Digital devices

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Study on Over-Voltage of 220 kV Transformer＇s Neutrals and Protection Strategy

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Journal of Energy and power Engineering 2011年第11期5卷 1102-1108页

作者： H.P. Yu S.M. Chen P.C. Yang H. Yin G.L. Wu State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beoing 100084 China Chongqing Electric Power Research Institute Chongqing 401123 China

In order to limit short-circuit current and satisfy the need of relay setting, only part of the 220 kV power transformer is grounded, so on the neutrals of ungrounded transformers will appear the over-voltage. Currently the value of over-voltage on transformer neutral point and the corresponding protection strategy is based on theoretical formula. This article uses the PSCAD/EMTDC software to calculate the over-voltage on the neutral point of 4 ungrounded power transformers in Chongqing 220 kV power grid. The result shows that the power frequency transient over-voltage on the neutrals may reach 178 kV. If the single-phase grounding fault occurs in ungrounded power system, the power frequency over-voltage on the neutrals will be more serious and rise to 138.6 kV. Non-full phase operation may cause serious ferro-resonance over-voltage on the neutrals of no-load transformer, which may last for seconds and may rise to 723.7 kV, causing serious threat to the transformer neutrals and line-side equipment. The article also studies the gap parameter which should be taken on the neutrals of 220 kV transformers at the end.

关键词： Neutral point power transformer arrester gap power frequency over-voltage lightning over-voltage.

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Autonomous Decentralized control of Distributed generation using Multi-Agent Reinforcement Learning 11

Autonomous Decentralized Control of Distributed Generation u...

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11th International Conference on Innovative Smart Grid Technologies - Asia, ISGT-Asia 2022

作者： Liul, Jian Xul, Weifeng Liul, Zhijun Ful, Guanhua Jiang, Yunpeng Wang, Jun Zhejiang Electric Power Co. Ltd. Hangzhou Power Supply Company of State Grid Hangzhou310016 China Wuxi Research Institute of Applied Technologies Tsinghua University China Tsinghua University State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Beijing100084 China

ISBN: (纸本)9798350399660

With the large-scale integration of distributed generations (DGs), a centralized control approach is being challenged concerning communication efficiency, resiliency to communication failure, privacy, and scalab.lity. An autonomous decentralized control for DGs in distribution networks is proposed to ensure privacy while also reducing the computational burden. Meanwhile,a multi-agent reinforcement learning method considering privacy protection constraints is developed to solve the autonomous decentralized control problem. The effectiveness of the proposed control method is verified by the numerical example of the modified 141-bus distribution system test-feeder. © 2022 IEEE.

关键词： Distributed power generation

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