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2021 International Conference on power system Technology, powerCON 2021

作者： Zhou, Qiang Ma, Yanhong Lv, Qingquan Zhang, Ruixiao Wang, Wei Yang, Shiyou State Grid Gansu Electric Power Research Institute Gansu Key Laboratory of Renewable Energy Integration Operation and Control Lanzhou China State Grid Gansu Electric Power Corporation Gansu Key Laboratory of Renewable Energy Integration Operation and Control Lanzhou China Zhejiang University College of Electrical Engineering Hangzhou China

ISBN: (纸本)9781665407373

High precision wind power curve is essential to wind power predictions. In order to eliminate a host of abnormal data of a wind turbine, the abnormal data is divided into decentralized data or abandoned data, and the wind speed into low wind speed and high wind speed ranges in this paper. An algorithm based on the combination of the quartile and clustering is proposed to clean the abnormal data of the two types of the wind speed ranges respectively. Moreover, in view of the elimination of a wealth of missing data, the interpolation method based on class center is employed. The numerical results on cleaning and reconstruction of turbine data in a prototype wind farm have positively confirmed the performances of the proposed algorithm. © 2021 IEEE.

关键词： Wind power

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LVRT During-fault-stage Equilibrium Point is Unnecessary for Renewable Grid-tied systems

LVRT During-fault-stage Equilibrium Point is Unnecessary for...

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power system and Green Energy Conference (PSGEC)

作者： Yayao Zhang Min Cheng Meng Zhan Jiawei Yu Yihua Zhu Mingkang Wu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China Yunnan Power Grid China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid China National Energy Power Grid Technology R&D Centre Electric Power Research Institute China Southern Power Grid China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Electric Power Research Institute China Southern Power Grid China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

Transient synchronous stability of renewable grid- tied systems is of paramount importance. Most of previous studies focused on the grid-tied converter in the low voltage ride through (LVRT) during-fault stage and performed stability analysis based on the belief that if the system has (or has no) a stable equilibrium point in the during-fault stage, the system will be stable (or unstable). Therefore, it has been broadly accepted that the existence and/or stability of equilibrium point in the during-fault stage is necessary. However, the whole LVRT contains four different stages and the during-fault stage is only one among them. The transient synchronous stability of whole system should be determined by the initial state in the late post-fault stage and the attraction basin of its equilibrium point. The late post-fault stage is essential for stability and all four stages are important. Clearly treating the during-fault stage as the whole LVRT stages makes the nonlinear switched dynamics problem be greatly simplified and, certainly, is incomplete. In order to clarify this point, this paper analyzes the influence of existence (or nonexistence) of equilibrium point in the during-fault stage on the transient synchronous stability of permanent magnet synchronous generator grid-tied system. We can find that the existence of an equilibrium point in the during-fault stage is only a sufficient condition, rather than a necessary condition. The theoretical analysis is also verified in the hardware-in-the-loop experiment Therefore, a large number of previous studies and results on the transient synchronous stability of renewable grid-tied systems are incomplete and questionable.

关键词： Sufficient conditions Stability criteria Switches Voltage power system stability Synchronous generators Permanent magnets Nonlinear dynamical systems Transient analysis Magnetic switching

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Multi-microgrid Energy Management systems: Architecture, Communication, and Scheduling Strategies

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Journal of Modern power systems and Clean Energy 2021年第3期9卷 463-476页

作者： Bin Zhou Jianting Zou Chi Yung Chung Huaizhi Wang Nian Liu Nikolai Voropai Daosen Xu the College of Electrical and Information Engineering Hunan UniversityChangsha 410082China the Department of Electrical and Computer Engineering University of SaskatchewanSaskatoonSK S7N5A9Canada the College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China the Melentiev Energy Systems Institute of Siberian Branch of the Russian Academy of Sciences Irkutsk 664033Russia

The increasing penetration of various distributed and renewable energy resources at the consumption premises,along with the advanced metering,control and communication technologies,promotes a transition on the structure of traditional distribution systems towards cyber-physical multi-microgrids(MMGs).The networked MMG system is an interconnected cluster of distributed generators,energy storage as well as controllable loads in a distribution *** its operation complexity can be decomposed to decrease the burdens of communi-cation and control with a decentralized ***,the multi-microgrid energy management system(MIVIGEIV1S)plays a significant role in improving energy efficiency,power quality and reliability of distribution systems,especially in enhancing system resiliency during contingencies.A comprehensive overview on typical functionalities and architectures of MMGEMS is ***,the emerging communication technologies for information monitoring and interaction among MMG clusters are ***,various energy scheduling and control strategies of MMGs for interactive energy trading,multi-energy management,and resilient operations are thoroughly analyzed and ***,some challenges with great importance in the future research are presented.

关键词： Energy management system(EMS) microgrid communication renewable energy multi-energy system

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Quantitative Approaches to Evaluating the Chalking Layer on Silicone Rubber

Quantitative Approaches to Evaluating the Chalking Layer on ...

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International Conference on electrical Materials and power Equipment (ICEMPE)

作者： Qian Wang Tingyu Jiang Shuming Liu Shuqi Liu Ying Zhou Zhou Zuo Chao Wu Xidong Liang State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing China Qingpu Power Supply Company State Grid Shanghai Electric Power Company Shanghai China

Silicone rubber (SR) insulators are continuously affected by various kinds of environmental factors. Thus, the aging characteristics are of great significance for long-term operation. Chalking, which is a typical feature of aging, is often reported from areas with high temperature and humidity. However, the description of chalking level is still qualitative, leaving the quantitative evaluation approach uninvestigated. Therefore, in this paper, weight loss measurement is introduced, in order to quantitatively characterizing the chalking level of SR insulators. It indicates that the upper surface of insulator shed is more easily to get chalked, while the influence of electric field distribution is negligible. Subsequently, for the convenience of measurement on site, weight gain measurement is proposed, which is non-destructive. It is confirmed to have close results to the weight loss measurement.

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Capacitor Voltage Balancing Strategy Based on Zero-Sequence Voltage Injection for Half-Wave Commutated Modular Multilevel Converter

Capacitor Voltage Balancing Strategy Based on Zero-Sequence ...

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International Conference on power Electronics and Motion control (IPEMC)

作者： Nan Fu Bao Liu Yunfei Xu Sitong Zhu Kui Wang Yongdong Li Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Changping Beijing China Electric Power Research Institute of State Grid Liaoning Electric Power Co. Ltd. Shenyang China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

Half-wave commutated modular multilevel converter (HWC-MMC) is suitable for high-voltage large-capacity AC-AC conversion, and an appropriate capacitor voltage balancing strategy is essential. This paper analyzes the condition of capacitor voltage balancing and proposes a capacitor voltage balancing strategy based on optimal zero-sequence voltage injection using the model predictive control. Finally, the simulation is carried out to verify the proposed strategy.

关键词： Multilevel converters Voltage fluctuations Capacitors High-voltage techniques power system harmonics power electronics Steady-state

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Review on Modeling of Impact of Extreme Weather on Source-Grid-Load-Storage

Review on Modeling of Impact of Extreme Weather on Source-Gr...

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

作者： Yan Lv Bo Sun Miao Wang Yonggang Jiao Xuri Song Yadi Luo Peng Lu National Key Laboratory of Power Grid-Safety China Electric Power-Research Institute Beijing China Department of Electrical Engineering State Key Laboratory of Power System Tsinghua University Haidian District Beijing China

Source-Grid-Load-Storage (SGLS) is an important part of a power system, and each part affects the safe operation of the power system. In extreme weather conditions, the SGLS link in the power system will be affected. This article starts from the four aspects of “source-grid-load-storage”, first analyzing the impact of normal weather and extreme weather on power system operation, then modeling the “source-grid-load-storage” based on several typical extreme weather scenarios, and then presenting several technical solutions to cope with extreme weather. Finally, the related issues of “source-grid-load-storage” and the future development direction are summarized.

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Understanding cross-market strategic behaviors of prosumers: An equilibrium-driven evolutionary game approach

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Journal of Cleaner Production 2025年 513卷

作者： Kang, Kai Su, Yifan Yang, Peng Wang, Zhaojian Zhang, Yunfan Qi, Ning Liu, Feng State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing100084 China School of Electrical Engineering Chongqing University Chongqing400044 China School of Electronics and Information Xi'an Polytechnic University Xi'an710048 China Department of Automation Shanghai Jiao Tong University Shanghai200240 China China Electric Power Planning & Engineering Institute Beijing100088 China Department of Earth and Environmental Engineering Columbia University New YorkNY10027 United States

The rise of prosumers and the success of the sharing economy have catalyzed the development of energy sharing market (ESM), which is set to coexist with the conventional distribution energy market (DEM). However, the behaviors of prosumers within this evolving landscape remain underexplored due to the complex interactions among prosumers, ESM, and DEM. This paper presents a novel equilibrium-driven evolutionary game (EDEG) model that allows prosumers with bounded rationality to trade energy and choose participation in DEM, ESM, or both. Unlike previous studies, prosumers’ profits in this model are determined by the market-clearing equilibria, which in turn influence their market selection. The prosumers’ bidding strategies make the market clearing a hard-solving generalized Nash game (GNG). To overcome this, we convert the GNG into an equivalent, more tractable optimization problem, and then incorporate the generalized Nash equilibrium (GNE) into the EDEG model. Building on this foundation, we derive a solution algorithm and establish sufficient convergence conditions for the model. Additionally, by analyzing the equilibria, the EDEG model sheds light on the prosumers’ market selection preferences, cross-market strategic behaviors, sharp price jumping in ESM, and the conditions necessary for the stable coexistence of ESM and DEM. Furthermore, an improved pricing scheme for DEM is proposed to mitigate cross-market arbitrage behaviors and alleviate market price volatility. Finally, the simulations of six prosumer groups over 10,000 days (approximately 27.4 years) validate the theoretical findings and show the effectiveness of the improved scheme in suppressing cross-market arbitrage and stabilizing the electricity price for ESM. © 2025

关键词： Cross-market strategic behavior Distribution energy market Energy sharing market Evolutionary game Generalized Nash equilibrium

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Analysis of Fault-induced Inrush Current of Converter Transformers in MMC-HVDC systems 18

Analysis of Fault-induced Inrush Current of Converter Transf...

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18th International Conference on AC and DC power Transmission, ACDC 2022

作者： Liu, Yadong He, Rui Pan, Zhiyuan Liu, Xiaoxiao Yang, Xinhui Zheng, Tao Li, Yanjun Gao, Chenguang State Key Laboratory of Power Grid Safety and Energy Conservation China Electric Power Research Institute Haidian Beijing China State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Changping Beijing China Department of Electrical Engineering Katholieke Universiteit Leuven Heverlee3001 Belgium Institute of Energy Systems School of Engineering University of Edinburgh EdinburghEH9 3DW United Kingdom

ISBN: (数字)9781839537615

ISBN: (纸本)9781839537615

Following a single-phase-to-ground (SPG) fault on the valve-side of the converter transformer in the modular multilevel converter (MMC) high-voltage direct-current (HVDC) system, the fault-induced inrush current (FIIC) of converter transformers may generate and impact the protection. This paper reveals the generation mechanism and impacts of FIICs in MMC-HVDC systems for the first time. Focusing on the valve-side SPG fault, pre- and post-blocking characteristics of the valve-side SPG fault are analysed. The upper-arm submodule (SM) capacitors may suffer a severe overvoltage due to continuous charging. Meanwhile, the DC components in the lower-arm fault currents will continuously penetrate the converter transformer, leading to the saturation of the converter transformer and the generation of the FIIC. The FIIC will speed up the occurrence of zero-crossing in the grid-side currents, which helps to cut off the fault currents using the grid-side AC circuit breakers. In addition, the mal-operation of differential protection caused by the FIIC in the case of valve-side SPG fault is analysed in detail. Finally, simulations in PSCAD/EMTDC based on the ±320 kV Xiamen MMC-HVDC project have been conducted to verify the correctness of the theoretical analysis. © ACDC 2022. All rights reserved.

关键词： Electric circuit breakers

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Sharing Mobilized Energy Storage for Temporal-Spatial Coordination of Transportation and power systems

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Journal of Modern power systems and Clean Energy 2024年第3期13卷 892-903页

作者： Yuhang Ding Xinjiang Chen Guangchun Ruan Gengyin Li Ming Zhou Jiang Dai Jianxiao Wang State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China State Grid Hangzhou Lin'an District Power Supply Company Hangzhou China Department of Industrial Engineering and Management College of Engineering Peking University Beijing China Laboratory for Information and Decision Systems Massachusetts Institute of Technology Cambridge MA USA Power Dispatching and Control Center Guizhou Power Grid Company Guiyang China National Engineering Laboratory for Big Data Analysis and Applications Peking University Beijing China

Mobilized energy storage (MES) can provide a variety of services for power systems, including peak shaving, frequency regulation, and congestion alleviation. In this paper, we develop an MES sharing approach based on temporal-spatial network (TSN) toward systemwide temporal-spatial flexibility enhancement, specifically in which the heavy-duty vehicles can exchange batteries at the energy storage stations connected with power grids. To achieve the temporal-spatial coordination of transportation and power systems, we propose a coordinated scheduling model. A decentralized algorithm based on the improved optimality condition decomposition (OCD) algorithm is proposed to address the information asymmetry between transportation and power systems while enhancing computational efficiency. Case studies based on IEEE 30-/118-bus and transportation systems demonstrate that MESs using the proposed approach can significantly improve the utilization of batteries while reducing operating costs by over 40% compared with stationary energy storages (SESs).

关键词： Transportation power systems Batteries Planning Costs power grids Uncertainty

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power Quality Disturbances Classification with Imbalanced/Insufficient Samples Based on Wgan-Gp-Sa and Dcnn

SSRN

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SSRN 2024年

作者： Xi, Yanhui Li, Xule Zhou, Feng Hunan Province Higher Education Key Laboratory of Power System Safety Operation and Control Changsha University of Science and Technology Hunan Province Changsha410114 China School of Electronic Information and Electrical Engineering Changsha University Hunan Province Changsha410022 China

The accurate identification of power quality disturbance signals (PQDs) is of great importance to ensure the safe and stable operation of power systems. Considering that there are insufficient samples and imbalance samples of power quality disturbance signals in real systems, the hybrid classification method based on WGAN-GP-SA (Wasserstein generative adversarial networks with gradient penalty and Squeeze-and-Excitation block with atrous spatial pyramid pooling module) and DCNN (deep convolutional neural network) is proposed for recognition of PQDs. Firstly, time-frequency features are extracted by combining improved Kalman and continuous wavelet transforms (CWT);secondly, the original training time-frequency maps are expanded by using WGAN-GP-SA, which can learn the distribution of real data and generate similar samples, and PSNR, SSIM, FID and other indexes are introduced for evaluation of generated data;finally, classification experiments are conducted on two data sets using DCNN, and simulation results show that the accuracy is improved by 2.82% compared with the original data without augmentation. Furthermore, t-distributed stochastic neighbor embedding algorithm (t-SNE) is introduced for visually analysing of classification performance of various datasets, and the visualization indicates the superiority of the hybrid classification method. © 2024, The Authors. All rights reserved.

关键词： Generative adversarial networks

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