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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Yongning, Chi Yan, Li Zhen, Wang Zhen, Li Hongzhi, Liu Zhankui, Zhang China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing China

ISBN: (纸本)9781728135205

In some regions, for example in Northwest and Northeast China, Northern Germany, Denmark, Spain, Portugal, Ireland or Texas, RE generation supplies a significant amount of the total energy demand. In the future, more and more countries are likely to experience similar situation as RE generation is increasingly considered not only as a means to reduce CO2 emissions, but also as an interesting economic alternative in areas with appropriate RE resources. However, RE generation delivers a variable level of power depending on the wind speed, and is not dispatchable in the same way as conventional energy sources due to the special characteristics. The integration of high penetration level of RE generation in some regions has brought much challenge on maintaining power system reliability and the balance between load and generation. Since the power system were originally designed around large-scale synchronous generators, new approaches and solutions are required when RE generation is integrated into power system with high penetration. This paper provides an introduction about the special characteristics of RE generation, and tries to explore potential challenge caused by the integration of RE generation into power systems. In addition, this chapter will focus on wind and solar power considering their high share in RE generation. © 2019 IEEE.

关键词： Solar energy

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Research on High Voltage Ride Through of Wind Turbine based on Combination of Series Impedance Divider and Parallel High Impedance Grounding

Research on High Voltage Ride Through of Wind Turbine based ...

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2019 IEEE Sustainable Power and energy Conference, iSPEC 2019

作者： Yan, Li Yongning, Chi Haiyan, Tang Xinshou, Tian China State Key Laboratory of Operation Control of Renewable Energy Storage Systems China Electric Power Research Institute Beijing China

ISBN: (纸本)9781728149301

The impact of high voltage ride through (HVRT) capability of wind energy on the security of power grid is therefore much concerned. At present, there have been no explicit requirements for technical rules of HVRT. However, the high voltage phenomena may occur during the voltage recovery after the clearance of short circuit faults, and the operation of power grid could also lead to high voltages. With the increasing scale of integration of renewable energy, the high voltage issue has become an important barrier that limits the large-scale integration of wind power. Therefore, it is very necessary to carry out research on HVRT to make sure the security and stability of power grid with large-scale wind power. This paper proposes an HVRT method for wind turbine based on combination of series impedance divider and parallel high impedance grounding equipped at the wind turbine terminal. According to the voltage dividing characteristic of impedance in the classic circuit analysis, the series impedance is installed at the wind turbine terminal. During high voltage period time, switch series impedance is closed to realize high-impedance grounding that decreases the terminal voltage. When the voltage recovers to normal range, cut off series impedance, then HVRT is fulfilled. © 2019 IEEE.

关键词： Wind turbines

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General modelling method for impedance of voltage source converter 8

General modelling method for impedance of voltage source con...

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8th renewable Power Generation Conference, RPG 2019

作者： Wang, Zhibing Liu, Hongzhi Li, Qing Wang, Weishen State Key Laboratory of Operation and Control of Renewable Energy Storage Systems China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9781839531255

Voltage source converters (VSC) have been widely used in renewable energy generation, flexible ac/dc transmission and energy transfer devices, which result in a lot of system transient stability problems, but essential cause and the physical significance are not yet systematically analysed. Firstly the paper researches the working principle and stable mode of typical voltage source converters, when considering control strategy, circuit parameters and other influencing factors, and then, the general mathematical model of AC side and DC side impedance of voltage source converters is established with internal dynamic process based on the stationary reference frame. On this basis, all of states are studied on the influence of output impedance amplitude of VSC for the operation characteristics, the influence domain characteristics of impedance for the operation stability of converter, and the key components or parameters that affect the output impedance amplitude. In the meanwhile, the frequency-domain analysis is developed to verify the correctness of above results. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Frequency domain analysis

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Study on Grid-connected renewable energy Grid Code Compliance

Study on Grid-connected Renewable Energy Grid Code Complianc...

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2019 IEEE Sustainable Power and energy Conference, iSPEC 2019

作者： Yongning, Chi Yan, Li Zhen, Li Ziyu, Chen Hongzhi, Liu China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Beijing China

ISBN: (纸本)9781728149301

Since requirements for renewable power are set in grid codes, power plant operators should take the responsibility to guarantee grid code compliance, and system operators on the other hand should evaluate the effect of specific power plants on power system operation in various situations. Non-compliance of power plants with grid code may lead to subsidy curtailment even after its disconnection from the grid. In order to unify the understanding level and measurement scale of grid code compliance, objective and systematic standards about compliance testing and assessment are necessary. The objective of renewable power testing is to outline measurement methods for the determination of reliable and comparable data for power generating units and plants based on state-of-the-art technology. The process of testing the electrical behavior of renewable power plants meet specific technical requirements in grid codes is also needed to be specified. Generally, grid compliance test of renewable energy mainly includes power quality test, control performance test, low-voltage ride through test, voltage/frequency response test and anti-islanding protection test. It is available to test the capability of the whole renewable plant for the performance of power quality and control performance. Some items such as low-voltage ride through test, voltage/frequency response test or anti-islanding protection test that can not be tested for the entire power plant for the reasons that the capacity of test facilities does not as large as the entire plant or testing will cause an unacceptable impact on the grid. Therefore testing the wind turbine or PV power unit then making the simulation to assess grid compliance of the whole plant is well alternative method. This paper provides an introduction about the study on grid code compliance testing of renewable energy grid integration on both technologies and standardization aspects, and tries to explore potential challenge caused by the integration

关键词： Quality control

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Low-Cost Approach for Improving Video Transmission Efficiency in WVSN

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Journal of Shanghai Jiaotong university(Science) 2020年第5期25卷 600-605页

作者： LIU Min DENG Bin TANG Ying WU Minghu WANG Juan Hubei Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System.Hubei University of Technology Wuhan 430068.China Department of Electrical and Computer Engineering.Rowan University GlassboroNJ 08028USA State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China Institute of Smart Education Qingdao Academy of Intelligent IndustriesQingdao 266041ShandongChina

The wireless visual sensor network(WVSN)as a new emerged intelligent visual system,has been applied in many video monitoring ***,there is still great challenge because of the limited wireless network *** resolve the problem,we propose a real-time dynamic texture approach which can detect and reduce the temporal redundancy during many successive image ***,an adaptively learning background model is improved to discover successive similar image frames from the inputting video ***,the dynamic texture model based on the singular value decomposition is adopted to distinguish foreground and background element ***,a background discarding strategy based on visual motion coherence is proposed to determine whether each image frame is streamed or *** evaluate the trade-off performance of the proposed method,it is tested on the CDW-2014 dataset,which can accurately detect the first foreground frame when the moving objects of interest appear in the field of view in the most tested dynamic scenes,and the misdetection rate of the undetected foreground frames is near to *** to the original stream,it can reduce the occupied bandwidth a lot and its computational cost is relatively lower than the state-of-the-art methods.

关键词： wireless visual sensor network(WVSN) temporal redundancy foreground background dynamic texture

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Analysis of interaction between wind turbines in wind farm based on small signal model of doubly-fed wind turbine 8

Analysis of interaction between wind turbines in wind farm b...

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8th renewable Power Generation Conference, RPG 2019

作者： Li, Yan Chang, Yuanzhu Chi, Yongning Tang, Haiyan Tian, Xinshou China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Beijing China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

As the penetration rate of renewable energy in the system becomes higher and higher, the interaction between renewable energy and the system becomes more and more obvious. Taking a wind farm as an example, a single wind turbine and system are coupled together by the voltage of the wind turbine. The voltage of the wind turbine is determined by the internal potential of the wind turbine and the grid voltage. When the wind power penetration rate in the system is relatively high, the influence of the potential of the wind turbine on the voltage will be as important as the influence of the system on the internal potential. The system disturbance will have a dynamic impact on the voltage of the wind turbine. Since the convertor of the wind turbine is strongly dependent on the voltage, the dynamics of the voltage will bring about the dynamics of the wind turbine convertor. When there is disturbance on the wind turbine side, the dynamics of the wind turbine power will affect the voltage, which in turn affects the voltage of each node of the power system. Therefore, the system has a strong interaction between the wind turbine and the grid under high wind power penetration. In this paper, the current mainstream model doubly-fed wind turbine wind farm is taken as an example. Firstly, the influence of system power grid dynamics under different power variations on the dynamic behavior of doubly-fed wind farm integration is analyzed. On this basis, the influence of the power collection line of electrical connection in the wind farm on its dynamic characteristics is studied, and the analysis of the interaction of the wind turbines in the wind farm is realized. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Wind turbines

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Analysis of Coordinated control Strategy for Large-scale renewable energy VSCHVDC Integration

Analysis of Coordinated Control Strategy for Large-scale Ren...

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Yan, Li Zhibin, Wang Yongning, Chi Chunxia, Wei Hongzhi, Liu Haiyan, Tang China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy Storage Systems Beijing China

ISBN: (纸本)9781728135205

When a large-scale renewable energy source is connected to a VSC-HVDC grid and the VSC-HVDC system is used for long-distance transmission, the operational characteristics of the renewable energy and the VSC-HVDC grid will affect each other. The adaptability of the renewable energy to the VSC-HVDC grid will become an important factor affecting the operation of the grid. China has built the Nanao three-terminal VSC-HVDC project, the Zhoushan five-terminal VSC-HVDC project, and the two- terminal of the Xiamen VSC-HVDC project. Breakthroughs have been made in the impact of AC/DC system interconnection and key equipment technologies for VSC-HVDC transmission systems, especially VSC-HVDC converters and control protection technology. This paper focuses on the two main problems with renewable energy island integration. The first problem is how the VSC-HVDC grid provides a stable AC voltage to the renewable energy source without AC grid support. The second issue is how to maintain the energy balance of the VSC-HVDC system in the event of a fault. When the receiving end fails, the power energy cannot be sent out. When the sending end fails, the energy will accumulate in the VSC-HVDC grid. The resulting overvoltage and overcurrent problems require new control protection technology to will be introduced in this paper. © 2019 IEEE.

关键词： renewable energy resources

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Triple effects of Sn-substitution on Na0.67Ni0.33Mn0.67O2

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Journal of Materials Science & Technology 2019年第7期35卷 1250-1254页

作者： Xiaohui Rong Fei Gao Feixiang Ding Yaxiang Lu Kai Yang Hong Li Xuejie Huang Liquan Chen Yong-Sheng Hu State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research InstituteBeijing 100192China Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100190China

Layered oxides are one of the most prom ising cathode materials for sodium ion batteries (NIBs), however, the relatively low working voltage hinders the increase of energy density thus limiting the application scenarios of NIBs. Here we prepared and investigated a series of Sn^4+ substituted NaO.67NiO.33M na67-xSnxO2 (x = 0.10, 0.20, 0.30, 0.33) and found that Sn-substitution can induce three effects: promoting O3-stack formation, sm oothing the voltage profile and increasing the working voltage to -3.6 V. This study would enrich the knowledge of Sn-substitution and give guide to the better design of high-voltage cathode materials for NIBs.

关键词： Sodium-ion batteries Layered oxide cathode Tin-based Cathode

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energy Management Strategy for Hybrid energy storage systems with Echelon-use Power Battery

Energy Management Strategy for Hybrid Energy Storage Systems...

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International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD

作者： Xiangjun Li Rui Ma Lijun Wang Shangxing Wang Dong Hui State Key Laboratory of Control and Operation of Renewable Energy and Storage Systems China Electric Power Research Institute Haidian District Beijing China

ISBN: (数字)9781728152158

ISBN: (纸本)9781728152165

With the booming development of electric vehicles, the number of retired power batteries increases year by year. Thus, the echelon-use battery becomes the focus of research. Echelon-use battery can be applied to battery energy storage system (BESS) in power grid, but its energy management strategy (EMS) should be different from ordinary battery. Based on the status of health (SOH) of echelon-use battery, an EMS of hybrid energy storage system (HESS) considering echelon-use battery is proposed in this paper. According to the SOH of each battery pack, the EMS can allocate the power according to the SOH of each battery packs, to make the echelon-use battery play the appropriate performance. Finally, the effectiveness of the proposed method is verified by simulation.

关键词： Batteries state of charge energy management Medical services Job shop scheduling Discharges (electric) Power distribution

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Dispatching and control Information Freshness-Aware Federated Learning for Simplified Power IoT

Dispatching and Control Information Freshness-Aware Federate...

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GLOBECOM 2022 - 2022 IEEE Global Communications Conference

作者： Zehan Jia Ziqi Yu Haijun Liao Zhao Wang Zhenyu Zhou Xiaoyan Wang Guoqing He Shahid Mumtaz Mohsen Guizani Hebei Key Laboratory of Power Internet of Things Technology North China Electric Power University Beijing Baoding Hebei China Graduate School of Science and Engineering Ibaraki University Ibaraki-ken Japan State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China Instituto de Telecomunicações Aveiro Portugal Machine Learning Department Mohamed Bin Zayed University of Artificial Intelligence (MBZUAI) UAE

ISBN: (纸本)9781665435413

Dispatching and control information freshness conducts an important impact on the training accuracy of distributed energy dispatching and control model. Poor information freshness will increase the loss function of the training model, and reduce the reliability and economy of dispatching and control. Simplified power internet of things can provide plug-and-play and multi- mode fusion communication support, but it still faces challenges of the coupling of model training and data transmission as well as the difficulty in guaranteeing dispatching and control information freshness. In this paper, a semi-distributed federated learning- based framework for dispatching and control model training decision-making is proposed, and a dispatChing and control informAtion fReshness-aware batch size Optimization aLgorithm (CAROL) is presented. CAROL leverages deep Q network and dispatching and control information freshness awareness to learn the batch size optimization strategy. CAROL can minimize model loss function while guaranteeing long-term dispatching and control information freshness constraints. Compared with existing feder- ated learning algorithms, CAROL achieves superior performance in global loss function and information freshness.

关键词： Training Computational modeling Simulation Decision making Minimization Dispatching Data models

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