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

作者： Hongchang Qi Yongning Chi Yan Li Cong Wang Yiwen Fan Yu Xiao China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China School of Electrical and Electronic Engineering North China Electric Power University Beijing China

ISBN: (纸本)9781665434263

There are more than 80 megawatt-scale wind turbine manufacturers in China, and the current technical level of some manufacturers cannot provide accurate mathematical models of wind turbines, and there is no guidance for unified modeling methods in China. The International Electrotechnical Commission (IEC) has basically clarified the classification of various wind turbines, and has determined the four types of wind turbines that are currently mainstream in the market. In the current market in China, most of the III-type and IV -type turbines with variable speed and constant frequency solutions. Therefore, establishing a generalized wind power model and its parameter library, and then determining the actual parameters of each different turbines through parameter identification technology will be the main research and development direction of subsequent wind power modeling. It is an important scientific and technical basis for wind power simulation research and verification analysis capabilities which is necessary for forming a standardized and reliable system safety and stability analysis and evaluation system after large-scale wind power is connected to the power grid. It is the main research direction in the future to carry out generalized modeling research for the mainstream wind turbines in the market, so that the wind turbine / wind farm model can be standardized and generalized and can be applied to different simulation tools and different unit models.

关键词： Analytical models Parameter estimation IEC Wind power generation power system stability Wind farms Mathematical models

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A Novel Constant power operation Mode of Constant Volume Expansion Process for Aa-Caes: Regulation Strategy, Dynamic Simulation, and Comparison

SSRN

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SSRN 2023年

作者： Xiao, Feng Chen, Wei Zhang, Bin Zhang, Tong Xie, Ningning Wang, Zhitao Chen, Hui Xue, Xiaodai College of Electromechanical Engineering Qingdao University of Science & Technology Qingdao266061 China State Key Laboratory of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100084 China Science and Technology Research Institute China Three Gorges Corporation Beijing100038 China China Huaneng Group Co. LTD Beijing100031 China

A novel operation mode of constant volume discharging process for advanced adiabatic compressed air energy storage (AA-CAES) is proposed, which achieves a constant output power by throttling and air supplementation. The dynamic model of the expansion process was developed based on the conservation of mass and energy of the open system. The reliability of the turbine and air storage tank models was verified. The results of the energy and exergy analysis of the expansion process show that the model conforms to the laws of thermodynamics. It is found that the exergy loss in the throttle valve and turbine was greater than those in the reheater. The effects of the first stage turbine inlet pressure and the minimum storage pressure on the system design parameters and performance parameters were investigated. The energy storage efficiency of the three expansion modes is compared. The results show that the throttle and supplementary air mode can keep the constant output power and the output work isn't much different from the sliding pressure mode. Compared with the constant pressure mode, the output work of throttle and supplementary air mode increases significantly. © 2023, The Authors. All rights reserved.

关键词： Compressed air energy storage

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Technical requirements and schemes for analysis and control of transient response characteristics of active power restoration of wind power

Technical requirements and schemes for analysis and control ...

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Sustainable power and Energy Conference (iSPEC)

作者： Cong Wang Yan Li Hongchang Qi Xinshou Tian Yu Xiao Xiangyu Li China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China School of Electrical and Electronic Engineering North China Electric Power University Beijing China

ISBN: (纸本)9781665414401

China’s relevant standards for wind power access to the power grid stipulate that the wind farm should have low-voltage ride through capability, dynamic reactive power support capability from the wind farm access point and other basic technical requirements. On the one hand, the transient response characteristics of wind turbines are the main determinant of the transient response characteristics of wind farms, while the transient response characteristics of wind turbines connected to the grid are not consistent in the current market. On the other hand, the transient response characteristics of wind farms cannot be simply understood as simple amplification or superposition of the transient response characteristics of wind turbines. Because the electrical distribution of wind turbines in a wind farm has the characteristics of dispersion and correlation, the mutual interaction between wind turbines will also have a significant impact on the transient response characteristics of the wind farm. For the future research trend of wind power grid connection stability, the main work of this paper is as follows. First, based on the published domestic wind turbine model verification standards, an electromechanical transient simulation model is established to more accurately simulate the transient response characteristics of wind turbine active power recovery. With that, the transient response characteristics of wind turbines, the interaction between wind turbines and the influence of wind farm collection system on the transient response characteristics of wind farm active power recovery are studied, and the transient simulation model of wind farm is established. Finally, the influence of grid-connected wind farm active power recovery characteristics on the system is analyzed. And corresponding active power recovery and reactive power output control strategies to improve the stability of wind power grid-connected are proposed. This paper focuses on the research on technical requ

关键词： Technical requirements Transient response Stability criteria Wind power generation Wind farms power system stability Mathematical models

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Study on power control Optimization Technology for Wind Turbines During power Grid Transient Process

Study on Power Control Optimization Technology for Wind Turb...

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

作者： Cong Wang Yan Li Yiwen Fan Yongning Chi Yu Xiao Hongchang Qi China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China School of Electrical and Electronic Engineering North China Electric Power University Beijing China

ISBN: (纸本)9781665434263

Due to the increasing proportion of wind power in regional grids the four corners of the earth and the withdrawal of traditional fossil power sources from operation, wind power is required to take on more responsibility in the grid and proactively involved in controlling the actual operation of the grid on the basis of ensuring safe and stable access to the grid. The LVRT technology for wind turbines in transient processes is now more mature, but the active support technology of wind power to the grid is now mainly reflected in the single function implementation and for the steady state support of the system, as more and more AC and DC mixed connection phenomenon in the grid, and its operating conditions are very complex. This has led to a lack of research on the active support of the grid under various transient processes. This paper investigates the requirements of wind turbines for power active support optimal control techniques during grid transients, the research on the optimization of the reactive voltage control technology in the transient process of wind turbines is not perfect, one of it is the double-fed wind turbines under grid faults and the dynamic state of full power variable-speed wind turbines are unclear, and there are no targeted method for active support of transient process voltages; the other one is the two types of wind turbines, doubly fed wind turbines, as well as full power variable speed wind turbines face the problem of adaptive control of active power during transient processes.

关键词： power control Process control Switches Wind power generation power grids Wind turbines Circuit faults

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Research on Transforming Effect and Calculation Method of MMC Converter on AC / DC Harmonics

Research on Transforming Effect and Calculation Method of MM...

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Sustainable power and Energy Conference (iSPEC)

作者： Liu Cui Guangqiang Peng Jingsong He Jiyang Wu Chizu Mao Ning Jiao State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid GuangZhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System GuangZhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid GuangZhou China Maintenance & Test Center EHV Power Transmission Company Guangzhou CSGKEY LABORATORY FOR DC TRANSMISSIONEQUIPMENT STATE EVALUATION AND FAULT DIAGNOSIS GuangZhou China College of Electrical Engineering and Information Technology Sichuan University Chengdu China

ISBN: (纸本)9781665414401

Modular multilevel converter (MMC) is currently the most concerned voltage source converter topology in the field of flexible direct current transmission (VSC-HVDC). Due to its non-linear characteristics, harmonic components will inevitably be generated in AC and DC systems, which may affect the operation of equipment and system, cause protection equipment to malfunction, and cause interference to neighboring communications. The MMC converter is a non-linear device, which can be considered as an amplifying modulator with voltage and current conversion functions. The AC and DC networks are coupled to each other through the MMC converter to generate dynamic harmonic interaction. In recent years, harmonic instability problems have appeared in many VSC-HVDC projects. Compared with other converter topologies, the transfer relationship of harmonics on the AC and DC sides of MMC converters has not been studied in depth. In this paper, by studying the AC/DC harmonic conversion characteristics of MMC converters, it reveals the conversion law of MMC converters between AC/DC harmonics; through theoretical derivation, the quantitative calculation method of MMC harmonic transmission process is given. PSCAD simulation results prove the correctness of the above results.

关键词： Network topology Simulation Bridge circuits Voltage power system harmonics Harmonic analysis Frequency conversion

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Joint Optimization of Wind Farm Layout Considering Optimal control

arXiv

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arXiv 2021年

作者： Chen, Kaixuan Lina, Jin Qiu, Yiwei Liu, Feng Song, Yonghua State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100087 China Department of Electrical and Computer Engineering University of Macau 999078 China

The wake effect is one of the leading causes of energy losses in offshore wind farms (WFs). Both turbine placement and cooperative control can influence the wake interactions inside the WF and thus the overall WF power production. Traditionally, greedy control strategy is assumed in the layout design phase. To exploit the potential synergy between the WF layout and control so that a system-level optimal layout can be obtained with the greatest energy yields, the layout optimization should be performed with cooperative control considerations. For this purpose, a novel two-stage WF layout optimization model is developed in this paper. Cooperative WF control of both turbine yaw and axis-induction are considered in the WF layout design. However, the integration of WF control makes the layout optimization much more complicated and results in a large-scale nonconvex problem, hindering the application of current layout optimization methods. To increase the computational efficiency, we leverage the hierarchy and decomposability of the joint optimization problem and design a decomposition-based hybrid method (DBHM). Instead of manipulating all the variables simultaneously, the joint optimization problem is decomposed into several subproblems and their coordination. Case studies are carried out on different WFs. It is shown that WF layouts with higher energy yields can be obtained by the proposed joint optimization compared to traditional separate layout optimization. Moreover, the computational advantages of the proposed DBHM on the considered joint layout optimization problem are also demonstrated. © 2021, CC BY.

关键词： Electric utilities

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A novel smart community: Combining a flexible heating system as electrical demand response to enhance local renewable energy integration

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International Journal of electrical power & Energy systems 2025年 169卷

作者： Yufei Xi Yuguang Song Meng Chen Jiansheng Zhang Lin Cheng Zhe Chen State Key Laboratory of Power System Operation and Control Tsinghua University Beijing 100084 China Department of Electrical Engineering Tsinghua University Beijing 100084 China Department of Engineering University of Cambridge Cambridge CB2 1PZ UK Department of Energy and Power Engineering Tsinghua University Beijing 100084 China AAU Energy Aalborg University Aalborg 9220 Denmark

Due to ineffective coordination, energy communities integrating wind turbines (WTs) and photovoltaic/ photothermal (PV/PT) systems often fail to fully harness local renewable energy sources. To overcome this challenge, this paper proposes a novel smart community (SC) framework that incorporates a flexible heating system (HS). The proposed HS facilitates dispatchable solar power generation and responsive heat–electricity demand management by integrating medium-high-temperature photothermal (MHTPT) and ground-source heat pump (GSHP) technologies. Meanwhile, a dual-objective scheduling model is formulated to minimize the operating costs and carbon emissions of the SC system, and its effectiveness is validated through case studies. A hybrid solution architecture combining branch-and-reduce with multi-learning-task is proposed to efficiently solve the mixed-integer nonlinear programming (MINLP) model and generate multiple optimal Pareto solutions. Case studies on different system configurations validate the superior performance of the proposed SC in reducing operating costs and carbon emissions while enhancing local renewable energy integration. Additionally, the impact of varying renewable on-grid tariffs on SC system operations is analyzed.

关键词： Smart community Flexible heating system Medium-high-temperature photothermal Demand response Load shaping Renewable energy integration Dual-objective optimization

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Bus-bar splitting on enhancing static voltage stability for the base and contingency cases 4

Bus-bar splitting on enhancing static voltage stability for ...

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4th IEEE Conference on Energy Internet and Energy system Integration, EI2 2020

作者： Wang, Lei Chiang, Hsiao-Dong Lou, Wenjing Shandong University of Technology School of Electrical and Electronic Engineering Zibo China Cornell University School of Electrical and Computer Engineering IthacaNY United States China Electric Power Research Insitute State Key Laboratory of Operation and Control of Renewable Energy Storage Systems Beijing China

ISBN: (纸本)9781728196060

To enhance the voltage stability of power system, the bus-bar splitting is employed on the look-ahead base case with a credible set of disturbances. The purpose of this paper is identify a 'best' bus-bar splitting scheme for a look-ahead power system that can enhance the load margin of the look-ahead power system and ensure the load margins of contingency cases are great than a threshold preset by operators. Considering the complexity of online solution of the proposed problem, the group property of contingencies and a four-stage methodology are proposed in this paper. Results of the IEEE 118 bus-power system indicate the effectiveness of bus splitting and the four-stage methodology. © 2020 IEEE.

关键词： Voltage control

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Convergence analysis of dual decomposition algorithm in distributed optimization: Asynchrony and inexactness

arXiv

引用

arXiv 2021年

作者： Su, Yifan Wang, Zhaojian Cao, Ming Jia, Mengshuo Liu, Feng The State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing100084 China The Key Laboratory of System Control and Information Processing Ministry of Education of China Department of Automation Shanghai Jiao Tong University Shanghai200240 China The Faculty of Science and Engineering University of Groningen Groningen9747 AG Netherlands

Dual decomposition is widely utilized in distributed optimization of multi-agent systems. In practice, the dual decomposition algorithm is desired to admit an asynchronous implementation due to imperfect communication, such as time delay and packet drop. In addition, computational errors also exist when individual agents solve their own subproblems. In this paper, we analyze the convergence of the dual decomposition algorithm in distributed optimization when both the asynchrony in communication and the inexactness in solving subproblems exist. We find that the interaction between asynchrony and inexactness slows down the convergence rate from O(1/k) to O(1/√k). Specifically, with a constant step size, the value of objective function converges to a neighborhood of the optimal value, and the solution converges to a neighborhood of the exact optimal solution. Moreover, the violation of the constraints diminishes in O(1/√k). Our result generalizes and unifies the existing ones that only consider either asynchrony or inexactness. Finally, numerical simulations validate the theoretical results. Copyright © 2021, The Authors. All rights reserved.

关键词： Multi agent systems

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Polymeric insulating materials characteristics for high-voltage applications

Nature Reviews Electrical Engineering

引用

Nature Reviews electrical engineering 2024年 516-528页

作者： Tian-Yu Wang Gui-Xin Zhang Zhi-Min Dang Jie Mao Boya Zhang State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China Department of Chemical and Biomolecular Engineering University of California Los Angeles CA USA School of Chemistry and Chemical Engineering State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering Ningxia University Yinchuan China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an China

Large-scale power system transmission and transformation equipment operates in high-voltage environments, placing notable requirements on the insulation strength of polymers used in core insulation frameworks. Increasing the polymer insulation performance in high-voltage environments is crucial for protecting large-capacity and integrated power equipment and ensuring the safe and stable operation of electrical devices. Here, we discuss the phenomena and the underlying mechanisms of bulk breakdown and surface flashover that lead to insulation failure in polymers and present relative strategies to increasing the performance of the insulating materials. We analyse the challenges faced by polymeric insulating materials in various extreme environments and the strategies to address them. Finally, we identify key challenges and highlight future directions and opportunities for the development of reliable polymeric insulating materials.

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