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arXiv 2020年

作者： Liu, Bi Huang, Qi Zhao, Junbo Milano, Federico Zhang, Yingchen Sichuan Provincial Key Lab of Power System Wide-area Measurement and Control University of Electronic Science and Technology of China Chengdu Sichuan611731 China Department of Electrical and Computer Engineering Mississippi State University StarkvilleMS39762 United States School of Electrical and Electronic Engineering University College Dublin Dublin Ireland National Renewable Energy Laboratory GoldenCO80401 United States

Virtual inertia controllers (VICs) for wind turbine generators (WTGs) have been recently developed to compensate the reduction of inertia in power systems. However, VICs can induce low frequency torsional oscillations of the drive train of WTGs. This paper addresses this issue and develops a new nonlinear VIC based on objective holographic feedbacks theory. This approach allows transforming the original nonlinear control into a completely controllable system of Brunovsky’s type. simulation results under various scenarios demonstrate that the proposed method outperforms existing VICs in terms of suppression of low frequency drive-train torsional oscillations, enhancement of system frequency nadir as well as fast and smooth recovery of WTG rotor speed to the original MPP point before the disturbance. The proposed method is also able to coordinate multiple WTGs. Copyright © 2020, The Authors. All rights reserved.

关键词： Frequency response

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Faulty line selection based on active-intervention-type arc suppression device via additional neutral resistance

Faulty line selection based on active-intervention-type arc ...

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8th Renewable power Generation Conference (RPG 2019)

作者： Kai Xu Peng Wang Fang Shi Chunyan Bian The Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education (Shandong University) 17923 Jingshi Road Jinan PR China State Grid Henan Electric Power Company Electric Power Research Institute Zhengzhou PR China State Grid Shandong Electric Power Company Dezhou Branch Dezhou PR China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

The excessive arc current will damage electric equipment and threaten personal security when the single-phase-to-ground fault occurs in the distribution network. The active-intervention-type arc suppression device can effectively suppress the arc current by actively switching on the grounding switch of the faulty phase at the bus. However, in case of mis-selection, a more severe two-phase fault will be triggered. This paper studies the procedures of the active-intervention-type arc suppression device and proposes a faulty line and faulty phase selection method based on the neutral point additional resistance. The real-time line-to-ground parameters are calculated using the neutral point voltage changes before and after the additional resistance switching, and then the change of the line-to-grounding parameter is analysed to determine the faulty phase. The zero-sequence components of each line are analysed, and a mathematical formula is presented to determine the faulty line as the switching of the additional resistor will change the zero-sequence circuit of the faulty line. simulation results show that the proposed method has high accuracy and reliability even for high-resistance-to-ground fault.

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Preventive control for combined heat and power system: A day-ahead security constrained economic dispatch model 11

Preventive control for combined heat and power system: A day...

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11th IET International Conference on Advances in power system control, Operation and Management, APSCOM 2018

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

ISBN: (纸本)9781839530043

Integrated Energy system (IES), which plays a vital role in the development of Energy Internet (EI), can improve the efficiency of energy utilization and integration of renewable energy. 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. For IES, the preventive control is the first line of defense to ensure that the system can keep stable operation when contingencies such as the transmission outage or generator outage happen. This paper proposes a preventive control approach for CHP system, in which a day-ahead security constrained economic dispatch (SCED) model of CHP system considering the coupling of heat and electric is formulated. The model aims to minimize the cost of the whole system, while the preventive control of the system can be achieved with the constraints considering the normal states and contingencies states. Case studies based on the IEEE 9-bus system with CHPs are presented to illustrate the approach. The case result shows that the combined electric and heat optimal dispatch is more economical than when two systems are independently optimized and operated. And the proposed preventive control approach of the CHP system can satisfy both the electric and heat demand, and system security is ensured when the N-1 contingencies happened. © 2018 Institution of Engineering and Technology. All rights reserved.

关键词： Internet of Energy

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Wind farm active voltage regulation strategy of transient support improvement

Wind farm active voltage regulation strategy of transient su...

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8th Renewable power Generation Conference (RPG 2019)

作者： Cui Yang Song Peng Cheng Xuekun Qiao Ying Wang Xiaosheng Liu Jingbo State Grid Jibei Electric Power Co. Ltd. Research Institute North China Electric Power Research Institute Co. Ltd. Xicheng District Beijing China Grid-connected Operation Technology For Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory Xicheng District Beijing China State Key Lab of Control and Simulation of Power Systems and Generation Equipment Dept. of Electrical Engineering Tsinghua University Haidian District Beijing China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

The cumulative installed capacity of wind power worldwide has grown rapidly in recent years. Fixed reactive power control is adopted by wind turbines (WTs) to receive cycle instruction of wind farm (WF) automatic voltage control system (AVCS). It does not have active voltage regulation (AVR) capability, which reduces the reliability of power system operation. Firstly, two ways of WTs AVR which QV droop control and Vac control mode are introduced in this paper. On the basis, the problems of reactive power circulation and control points inconsistency during multi-WTs voltage regulation are discussed. The problems are solved by coordination of WTs of WF AVR strategy. WF voltage transient support capability is promoted by the strategy. Effectiveness is verified by simulation case of the proposed method.

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Fault characteristics study of VSC converter and protection design in DC microgrids 2

Fault characteristics study of VSC converter and protection ...

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2nd IEEE International Conference on Energy Internet, ICEI 2018

作者： Xie, Ranran Chen, Qing Zhang, Zhiming Zhou, Shengwen Xi, Chuanxin Wang, Lei Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China Guohua Energy Investment Co. Ltd Jinan China Overhaul Division State Grid HangZhou Power Supply Company HangZhou China Electric Power Dispatch Control Center State Grid Weifang Power Supply Company Weifang China

ISBN: (纸本)9781538641316

DC microgrid is an effective way for Grid-connected with distribution generators. However, its development is constrained by the lack of precise fault analysis and valid fault protection scheme. In this paper, cable pole-to-pole and pole-to-ground faults are analyzed in stages with fault circuits and relative equations. The current waveform and process of diodes in voltage-source converter (VSC) is focused on because of its vulnerability. It is demonstrated that diodes conduct simultaneously at the voltage of VSC dc side crossing zero point with inrush current, which may damage VSC severely. Moreover, the impact generated by ac source current to VSC dc-side voltage is studied. It is found that the fault distance, leading to VSC dc-side voltage crossing zero, is shortened. Consequently, the diodes will not conduct simultaneously for terminal faults, which is advantageous for protections designing. Then, the simulation system is established through PSCAD/EMTDC and the correctness of all the analysis is verified. Based on the fault characteristics, non-unit current differential protection combining with directional unit protection is proposed, which provides the possible that both speed and selectivity of protection can be satisfied. © 2018 IEEE.

关键词： Diodes

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Enhanced Moth-flame Optimization Based on Cultural Learning and Gaussian Mutation

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Journal of Bionic Engineering 2018年第4期15卷 751-763页

作者： Liwu Xu Yuanzheng Li Kaicheng Li Gooi Hoay Beng Zhiqiang Jiang Chao Wang Nian Liu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Engineering and Electronics Huazhong University of Science and Technology Wuhan 430074 China School of Automation Ministry of Education Key Laboratory of lmage Processing and Intelligence Control Huazhong University of Science and Technology Wuhan 430074 China Nanyang Technological University Singapore 639798 Singapore School of Hydropower and lnformation Engineering Huazhong University of Science and Technology Wuhan 430074 China China Institute of Water Resources and Hydropower Research Beijing 100038 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beij'ing 102206 China

This paper presents an Enhanced Moth-Flame Optimization （EMFO） technique based on Cultural Learning （CL） and Gaussian Mutation （GM）. The mechanism of CL and the operator of GM are incorporated to the original algorithm of Moth-Flame Optimization （MFO）. CL plays an important role in the inheritance of historical experiences and stimulates moths to obtain information from flames more effectively, which helps MFO enhance its searching ability. Furthermore, in order to overcome the disadvantage of trapping into local optima, the operator of GM is introduced to MFO. This operator acts on the best flame in order to generate several variant ones, which can increase the diversity. The proposed algorithm of EMFO has been comprehensively evaluated on 13 benchmark functions, in comparison with MFO. simulation results verify that EMFO shows a significant improvement on MFO, in terms of solution quality and algorithmic reliability.

关键词： bioinspired computing moth-flame optimization cultural learning Gaussian mutation benchmark functions

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Strength Prediction of Cruciform Specimen Under Biaxial Loading

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Transactions of Nanjing University of Aeronautics and Astronautics 2017年第3期34卷 286-295页

作者： Weng Jingmeng Wen Weidong Xu Ying Jiangsu Province Key Laboratory of Aerospace Power System State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and Astronautics

In order to achieve a better understanding of failure behavior of cruciform specimen under different biaxial loading conditions,a three-dimensional finite element model is established with solid and interface *** stress criterion,two Hashin-type criteria and the new proposed criteria are used to predict the strength of plain woven textile composites when biaxial loading ratio equals *** with experimental data,only the new proposed criteria can reach reasonable *** applicability of the new proposed criteria is also verified by predicting the tensile and compressive strength of cruciform specimen under different biaxial loading ***,the introduction of interface element makes it more intuitive to recognize delamination *** shape of the predicted delamination failure region in the interface layer is similar to that of the failure region in neighboring entity layers,but the area of delamination failure region is a little larger.

关键词： woven compressive tensile intuitive verified recognize specimen Prediction neighboring loaded

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A Review on Virtual power Plants Interactive Resource Characteristics and Scheduling Optimization

A Review on Virtual Power Plants Interactive Resource Charac...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Lin Cheng Xuyan Zhou Qiuchen Yun Liting Tian Xuanyuan Wang Zhen Liu State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing China Center of Electrical Laboratories and National Teching Center of Electrotechnics and Electronics Beijing Jiaotong University Beijing China Jibei Electric Power Company Power Exchange Center State Grid Jibei Electric Power Company Beijing China North China Electric Power Research Institute State Grid Jibei Electric Power Company Beijing China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131382

With a high penetration of distributed energy resources (DER) connected to the power grid, the reliability and safety of the power grid compromised by the uncertainty of energy output. Many utilities adopted strategies to abandon excessive wind and solar energy generation to ensure reliable operations of the power grid. The virtual power plant (VPP) is a way of aggregating various types of energy resources and optimizing resources utilization. It participates in the electricity market and improves the utilization of energy resources within the VPP. VPP provides services such as peak shaving, frequency regulation, and emergency power support for the power grid. It intends to prevent the negative impact caused by the uncertainty of power generation of the distributed energy resources. In this paper, three kinds of typical VPP interactive resource are introduced, which differ in characteristics, control modes, and output characteristics. In addition, the VPP achieves improved energy efficiency through rational optimized resource allocation and optimized scheduling, including internal and external scheduling optimization.

关键词： Uncertainty power grids Energy storage Load management Wind power generation

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A Feedforward control Strategy aiming at Withdrawal Disturbance of Load Side Resources

A Feedforward Control Strategy aiming at Withdrawal Disturba...

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Electronic Information Technology and Computer Engineering (EITCE), International Conference on

作者： Ziling Zou Zhetong Ding Ying Wang Kun Yuan Kaifeng Zhang Xin Shan Key Laboratory of Measurement and Control of CSE Ministry of Education Southeast University Nanjing China System R&D Center NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China

ISBN: (数字)9781728135847

ISBN: (纸本)9781728135854

In recent years, load side resources have been gradually applied to the frequency control of power systems. However, the characteristics of the load side resources are quite different from the generation side resources, especially the load side resources must secede the frequency control to ensure sufficient user tolerance. This characteristic causes withdrawal disturbance to the power systems, which does harm to the recovery of system frequency. In this paper, a feedforward control strategy is designed to reduce the negative impact of withdrawal disturbance of load side resources on the power systems, so as to improve the performance of the frequency recovery process. By informing the generator in advance about the withdrawal disturbance of load side resources, this method ensures that there are enough generation side resources to compensate when the load resources are withdrawn. The feedforward control strategy is simulated on the standard 10- machine 39-node system, and the experimental results show that the feedforward control can effectively reduce the impact of withdrawal disturbance by load side resources.

关键词： Feedforward systems Frequency control power systems Time factors simulation

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Wireless Network Monitoring system for River Ice Environment Based on a Data Fusion Algorithm

Wireless Network Monitoring System for River Ice Environment...

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作者： Zhen-yu ZHONG Li ZHANG Jian-min QIN Ze-yu ZHONG Li-qin CUI Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceTaiyuan University of Technology China Mobile Group Co. Ltd. State Grid Taiyuan Power Supply Company

There are still quite a few problems in river ice environment monitoring by remote monitoring network, such as the increase of the various sensor nodes and network capacity overload due to the dense deployment, and the decrease of the life expectance of the network. In view of this, the improved K-means data fusion algorithm was proposed to fuse a variety of data by a novel self-developed sensor. Furthermore, the resilient BP network was employed to build a data model database, so as to identify the overall river ice environment at the back-end remotely in real time. simulation verification and comparison test results show that the proposed algorithm can achieve efficient and accurate data transmission by various sensors and the existing sensor network during the real-time monitoring of the river ice environment.

关键词： River ice Wireless network monitoring Data fusion Data fusion algorithm

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