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8th Renewable power Generation Conference (RPG 2019)

作者： Chenzhi Qu Zhongwei Lin Zhen Xie Yilin Li Shangang Zhang Xiongwei Li Zhenqing Duan State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer Engineering North China Electric Power University Beijing 102206 PR China CHNENERGY (Shandong) New Energy Co. Ltd Jinan 250099 PR China Guodian New Energy Technology Research Institute Co. Ltd Beijing 102209 PR China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

Wind energy conversion system (WECS) is essentially a time-varying system with high nonlinear characteristics, which leads to the difficulty of guaranteeing the control performance in a wide-scale operating conditions for the conventional linear control strategies. In this paper, a linear-parameter-varying (LPV) gain-scheduled controller is proposed for variable-speed-variable-pitch wind turbines above rated wind speed, which improves both steady-and dynamic-response performances under wide-scale operating conditions. Firstly, the H 2 /H ∞ technique is adopted to reduce the rated power tracking errors, while enhancing the robustness against high-frequency turbulence. Secondly, the regional pole placement technique is applied on WECS, which builds the connections to the dynamic response performance. To verify the effectiveness of the proposed method, the simulation is implemented on the NREL 5 MW wind turbine, which is compared with the conventional local linear control strategy with a full analysis on the related performances.

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Fast Optimal Dispatch of Renewable Energy Sources in Distribution Networks

Fast Optimal Dispatch of Renewable Energy Sources in Distrib...

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2018 2nd International Workshop on Renewable Energy and Development (IWRED 2018)

作者： Wenbo Li Keqiang Li Liang Wang Bo Chen Xin Li Guojun Teng State Grid Shandong Electric Power Research Institute Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Shandong Electric Power Company

With the increasing penetration of distributed renewable energy sources such as photovoltaic and wind power generators in distribution networks, overvoltage problems occurred as a result of the reversed power flow. The randomness and intermittence of power outputs of the renewable energy sources make the operations of distribution systems complex at the same time. This paper proposes a simplified optimal dispatch algorithm for fast renewable energy sources power control to overcome voltage problems and permit better performance for distribution systems. Case study demonstrates the accuracy and efficiency of the optimal dispatch method proposed.

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CIRCUIT THEORY-BASED METHOD FOR power LOSS ESTIMATION IN DISTRIBUTION systemS WITH DISTRIBUTED GENERATOR

CIRCUIT THEORY-BASED METHOD FOR POWER LOSS ESTIMATION IN DIS...

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International Conference on Renewable power Generation

作者： Juntai Cui Li Zhang Boyi Zhang Keqiang Li Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China State Grid Shandong Economic and Technological Research Institute Jinan China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

With the rapid developing of renewable energy, it has become a trend that a large number of distributed generations (DGs) integrate into distribution network. Existing distribution energy loss calculation method cannot quickly evaluate the effect of DGs on the distribution loss. To explore new method, the application of circuit theory-based loss calculation method is discussed in distribution network with DGs. Considering that DG has the ability of voltage regulation, namely it can play an important role in distribution voltage support, the grid connection nodes of DGs are equivalent to voltage source nodes, while the other load nodes are equivalent to current source nodes. Then the distribution loss are calculated in three parts: the loss caused by the voltage source alone, the loss caused by the single action of the current source, and the loss related to the both sources and network structure parameters. Loss calculation and discussion are done the 33-bus test distribution system with DGs. The applicability of the method in quickly evaluating the power loss of DG integrated distribution system is analysed and some valuable observation is also presented.

关键词： DISTRIBUTION system power LOSS DISTRIBUTED GENERRATOR CIRCUIT THEORY-BASED METHOD SUPERPOSITION

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A general decoupled AC/DC power flow algorithm with VSC-MTDC

A general decoupled AC/DC power flow algorithm with VSC-MTDC

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Shilin Gao Hua Ye Yanling Du Haitao Liu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Grid Jibei Electric Power Company Beijing China

For a large scale hybrid AC/DC system, it is of great significance to find a power flow algorithm with good convergence and short calculation time. For the purpose, this paper presents a decoupled power flow algorithm for hybrid AC/DC system containing voltage source converter based multiterminal high voltage direct current (VSC-MTDC) grids. By redefining the boundary of the AC and DC grids at DC side of the VSCs, the power flow calculation (PFC) of the AC grid and the DC grid is decoupled. The VSC station is regarded as one part of the AC grid. Therefore, the power flow of the station is calculated in the AC grid PFC. Additionally, certain adjustments and simplifications are employed to the mismatch equations and Jacobian matrix of DC grids, which is time-saving. For generality, the loss model of the converter and various control strategies of the VSC station are detailedly considered. PFC of a modified New England 10-machine 39-bus test system is executed to show the validity and efficiency of the proposed algorithm.

关键词： Load flow Mathematical model power conversion Jacobian matrices Voltage control Hybrid power systems

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Modeling and Operation of the power-to-Gas system for Renewables Integration: A Review

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CSEE Journal of power and Energy systems 2018年第2期4卷 168-178页

作者： Xuetao Xing Jin Lin Yonghua Song You Zhou Shujun Mu Qiang Hu State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Department of Electrical and Computer Engineering University of MacaoMacaoChina Department of Electrical Engineering Tsinghua UniversityBeijing 100084China National Institute of Clean and Low Carbon Energy Beijing 102211China Tsinghua-Sichuan Energy Internet Research Institute Chengdu 610213China

power-to-Gas(P2G)plays an important role in enhancing large-scale renewable energy integration in power *** an emerging inter-disciplinary subject,P2G technology requires knowledge in electrochemistry,electrical engineering,thermodynamic engineering,chemical engineering and system *** at P2G modeling and operational problems concerning the research field of power systems and the energy internet,this paper briefly reviews the main technologies and application potentials of the P2G system,and makes systematic summaries of major progresses related to P2G’s integration into the power grid in a bottom-top manner,including the modeling of high/room-temperature electrolysis cells,steady-state/dynamic optimization control of the P2G system,P2G’s integrated model and operational strategies at the grid *** the final part of this paper,suggestions are put forward on future research directions of P2G systems from the aspects of modeling and operational optimization.

关键词： Electrolysis cell multi-energy network modeling and operation power-to-gas

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Operation Strategy Selection of a District Multi-Energy system Based on Environmental Impact

Operation Strategy Selection of a District Multi-Energy Syst...

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

作者： Huichao Kong Yu Luo Xuejin Huang Lin Cheng Liting Tian Ning Qi Dongguan Power Supply Bureau Guangdong Power Grid Co. Ltd. Dongguan China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China

District multi-energy systems are constructed to reduce environmental impact of energy consumption. This paper introduces a three-layer structure for district energy systems. And two representative operation strategies are proposed focusing on the energy services of the system. The operation strategies are applied to a district which consists of electricity distribution network, natural gas pipe network and heat pipe network. The energy efficiency and CO 2 emission are calculated under different scenarios. The results show that the system operation strategy has a significant impact on the environmental indices. It is suggested to choose the scheme with a priority of electric requirement for the investigated system.

关键词： Resistance heating Thermal loading power systems Energy efficiency Production Buildings Heat pumps

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Design of double loop controller for three-level boost converter

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IOP Conference Series: Materials Science and Engineering 2020年第6期768卷

作者： Yang Zhao Tieduo Xu Yun Zhao Shengqiao Hu Hubei Key Laboratory for Highefficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of Technology Wuhan 430068 P. R. China State Grid Hubei Electric Power Co Ltd. Shayang Country Power Supply Company Shayang China

Three-level Boost Converter (TLBC) is widely used in new energy generation grid-connected technology. This topology not only reduces the voltage stress of the switching tube and the diode, but also has a smaller size, lighter weight and higher power density. However, it has the problem of midpoint potential shift. In this paper, a dual closed-loop controller is designed by establishing the AC small-signal model of the system. while stabilizing the output voltage, the upper and lower capacitor voltages are dynamically adjusted to ensure the balance of the midpoint potential. Finally, this paper establishes a simulation platform in MATLAB/Simulink and verifies the dual-loop controller scheme.

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Space Charge Behavior in AC Electrically Aged Low-Density Polyethylene Films

Space Charge Behavior in AC Electrically Aged Low-Density Po...

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China International Electrical and Energy Conference (CIEEC)

作者： Zixia Cheng Jinxing Shi Ling Zhang Yuanxiang Zhou Zekai Lu Shaowei Guo School of Electrical Engineering Zhengzhou University Zhengzhou China State Key Lab of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China Electric Power Research Institute State Grid Jibei Electric Power Company Beijing China

ISBN: (纸本)9781538653937

In order to study the effect of AC aging on space charge characteristics of low-density polyethylene (LDPE) films, an AC electric field of 50 kV/mm (peak value) was adopted for the accelerated aging test and space charge measurements of AC aged LDPE films were carried out subsequently. The results show that no significant space charge accumulation in the LDPE samples aged under a 50 kV/mm AC electric field. It can be seen that a significant positive space charge accumulation occurs inside the sample, when DC electric fields were applied to the AC aged LDPE samples. The long-term AC aging also causes more and deeper cracks on the surface of LDPE samples. Moreover, AC aging promotes the oxidation reaction of LDPE. The longer the aging time, the higher the degree of oxidation. On this basis, the probable relationship between space charge characteristics and material physicochemical properties of LDPE during AC electrical aging is clarified.

关键词： Aging Space charge Electric fields Anodes Insulation Polyethylene

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On Image Denoising Method Based on Sparse Representation

On Image Denoising Method Based on Sparse Representation

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第37届中国控制会议

作者： Xiao Li Changliang Liu School of Control and Computer Engineering North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University

An important way for people to obtain information is vision. However, during the collection and transmission of digital images, there is often some noise that is not good for people to get information quickly and correctly. Therefore, before the image processing analysis, the image denoising pretreatment is particularly important. However, the traditional denoising method will lose the details of the image and the result of denoising is unsatisfactory. In recent years, with the continuous improvement of sparse representation theory, it has also made great progress in image processing and has been well applied in image denoising, which has become one of the most effective methods in current image denoising methods. Using sparse coding decomposes the image on sparse domain, and the handling of the sparse coefficient by setting threshold. And based on a sparse representation of an overly-complete dictionary, an image is represented by a linear combination of atoms in the dictionary. Its adaptability also brings better denoising effect.

关键词： Image Denosing Sparse Representation Overcomplete Dictionary

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Offshore Wind Replaces Coal and Reduces Transmission, Enabling China to Meet the 1.5°C Climate Imperative

SSRN

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SSRN 2020年

作者： Li, Bo Ma, Ziming He, Gang Hidalgo-Gonzalez, Patricia Fedorova, Natalie Chen, Minyou Kammen, Daniel M. School of Electrical Engineering State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400030 China Renewable and Appropriate Energy Laboratory University of California BerkeleyCA94720 United States National Power Dispatching and Control Center Beijing100031 China Energy and Resources Group University of California BerkeleyCA94720 United States Department of Technology and Society College of Engineering and Applied Sciences Stony Brook University Stony BrookNY11794 United States Department of Mechanical and Aerospace Engineering University of California San DiegoCA92093 United States Goldman School of Public Policy University of California BerkeleyCA94720 United States Department of Nuclear Engineering University of California BerkeleyCA94720 United States

China is the world’s leading installer of wind turbines. Attention is rapidly rising in China to the potential of offshore wind. We utilize the SWITCH-China power sector capacity expansion model to explore the transformative role that offshore wind can play in China meeting the ambitious but critically needed 1.5 °C climate objective. We explore alternative energy mixes and analyze the resulting economic and CO2 emissions benefits of offshore wind as a major energy source for China. We find that offshore wind not only replaces coal-fired power plants, which dominate the energy mix in Chinese coastal regions, but also reduces the need for ultra-high-voltage (UHV) transmission lines to deliver the renewable energy generated in the West China to the coastal regions in the East. Offshore wind enables the coastal provinces to become a new hub of green electricity supply, with offshore wind could provide 2 % - 28.6 % of coastal generation (between 1% and 13.2% of total generation) by 2030 across cost-effective energy development scenarios. © 2020, The Authors. All rights reserved.

关键词： Coal

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