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Sustainable power and Energy Conference (iSPEC)

作者： Yunlong Hu Qi Wang Ming Ni Yi Yang Yongkang Zhu Xiecheng Yao College of Electrical and Automation Engineering Nanjing Normal University Nanjing China State Key Lab of Smart Grid Protection and Control NARI Group Corporation Nanjing China State Grid Jiangsu Electric Power Research Institute Nanjing China

ISBN: (纸本)9781665414401

Combined heat and power state estimation is the basis for safety assessment, optimal dispatching and other functions in multi-flow energy management centers, and has important theoretical value and practical significance. The measurement system inevitably has gross errors or bad data. The traditional weighted least squares method can’t restrain its influence, so the robust estimation method of combined heat and power network based on Huber estimation is proposed. The results of calculation examples show that the proposed method has good robustness and can restrain the influence of gross errors on the estimation accuracy.

关键词： Couplings Cogeneration Measurement uncertainty Robustness Safety power systems state estimation

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ANovel SCUC Model Considering Area control Errors and Resulting Penalties

ANovel SCUC Model Considering Area Control Errors and Result...

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

作者： Yuancheng Miao Bingbing Song Lifeng Wang Xiaobi Teng Yutong Li Zijie Chen Sijie Chen East China Branch of State Grid Corporation of China Shanghai China College of Smart Energy Shanghai Jiao Tong University Shanghai China Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China Shanghai Non-Carbon Energy Conversion and Utilization Institute Shanghai Jiao Tong University Shanghai China

The traditional Security Constrained Unit Com-mitment (SCUC) model focuses on minimizing the total cost of electricity generation while ensuring system security and reliability. However, this model does not consider the possibility that Independent System Operators (ISOs) can intentionally allow for area control errors (ACE) to reduce energy purchase costs. This article incorporates ACE and its associated penalties into the SCUC model. Given specific penalty prices, the model can reflect the impact of considering ACE on an ISOs' power pur-chasing decisions. Experimental results show that when penalty prices are relatively low, ISOs are more profitable by generating ACE and paying penalties than by purchasing electricity from other ISOs or purchasing demand response from flexible loads. Therefore a high-enough penalty price is necessary to ensure system reliability.

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A Risk-Averse Just-In-Time Scheme for Learning-Based Operation of Microgrids with Coupled Electricity-Hydrogen-Ammonia under Uncertainties

arXiv

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arXiv 2024年

作者： Li, Longyan Ning, Chao Pan, Guangsheng Zhang, Leiqi Gu, Wei Zhao, Liang Du, Wenli Shahidehpour, Mohammad Department of Automation Shanghai Jiao Tong University Shanghai200240 China Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China School of Electrical Engineering Southeast University Nanjing210096 China Zhejiang Key Laboratory of Distributed Generations and Microgrid Technology State Grid Zhejiang Electric Power Research Institute Hangzhou310014 China Key Laboratory of Smart Manufacturing in Energy Chemical Process Ministry of Education East China University of Science and Technology China Department of Electrical and Computer Engineering Illinois Institute of Technology ChicagoIL60616 United States

This paper proposes a Risk-Averse Just-In-Time (RAJIT) operation scheme for Ammonia-Hydrogen-based Micro-grids (AHMGs) to boost electricity-hydrogen-ammonia coupling under uncertainties. First, an off-grid AHMG model is developed, featuring a novel multi-mode ammonia synthesis process and a hydrogen-ammonia dual gas turbine with tunable feed-in ratios. Subsequently, a state-behavior mapping strategy linking hydrogen storage levels with the operation modes of ammonia synthesis is established to prevent cost-ineffective shutdowns. The proposed model substantially improves operational flexibility but results in a challenging nonlinear fractional program. Based upon this model, a data-driven RAJIT scheme is developed for the real-time rolling optimization of AHMGs. Unlike conventional one-size-fits-all schemes using one optimization method throughout, the data-driven RAJIT intelligently switches between cost-effective deterministic optimization and risk-averse online-learning distributionally robust optimization depending on actual risk profiles, thus capitalizing on the respective strengths of these two optimization methods. To facilitate the solution of the resulting nonlinear program, we develop an equivalent-reformulation-based solution methodology by leveraging a constraint-tightening technique. Numerical simulations demonstrate that the proposed scheme guarantees safety and yields an overall cost reduction up to 14.6% compared with several state-of-the-art methods. © 2024, CC BY.

关键词： Ammonia

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Identification of key Transmission Lines Based on Super Efficiency Data Envelopment Analysis Model

Identification of Key Transmission Lines Based on Super Effi...

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IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Lingxu Guo Yuan Zeng Cheng Yao Xin Wang Wenxu Zhang Waiying Guo Power Dispatching and Control Center State Grid Tianjin Electric Power Company Tianjin China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Tianjin Key Laboratory of Internet of Things in Electricity Tianjin Research Institute of Electric Science Tianjin China

Transmission lines are an important part of the power system. The selection of key transmission lines is conducive to the stable and safe operation of the transmission system. With the application of new technologies such as regional grid interconnection, wind power grid integration, and demand response, the internal structure and operating status of the power system are becoming more and more complicated. In view of this, this paper focuses on the comprehensive analysis and evaluation of key transmission line equipment, and proposes a comprehensive index calculation method based on the super-efficiency data envelopment analysis model to improve the key transmission line in the calculation of evaluation indicators. This paper also takes wind power and interruptible loads into consideration, uses situational awareness theory to divide the identification of key transmission lines into three phases: awareness phase, understanding phase, and prediction and presentation phase to evaluate and screen key transmission lines. Finally, taking the IEEE 24-node system as an example, the correctness and effectiveness of the method proposed in this paper are verified. The research work can provide useful references for system operators.

关键词： Analytical models power transmission lines Wind power generation Data models Safety Indexes Security

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Scheduling Model for Inter-regional HVDC Tie-line Generation and Transmission System Considering Conditional Sections

Scheduling Model for Inter-regional HVDC Tie-line Generation...

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IEEE/IAS Industrial and Commercial power System Asia (I&CPS Asia)

作者： Fan Xu Rongzhang Cao Mengfu Tu Yantao Zhang Leyong Yang Dandan Zhang State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

The HVDC transmission schedule for clean energy seldom considers the demand of receiving grid. With the expansion of clean energy scale, it brings great pressure to the receiving grid for safe and stable operation. For this reason, a generation and transmission scheduling model of inter-regional HVDC tie-line system considering conditional section is proposed. A step power adjustment model for the HVDC tie-line operation optimization is developed with consideration given to various constraints on tie-line power, which not only give full play to the characteristics of HVDC tie-line that can be flexibly adjusted, but also avoid the frequent conversion of HVDC converter equipment, making the HVDC tie-line schedule more executable. The joint operation model of cascaded hydropower plants in sending grid is established to meet the operational constraints such as the restricted operating zones of hydropower units, and to ensure the priority of clean hydropower resources and the practicability of the hydropower schedule. The model of conditional control section is established, which can effectively deal with the problem of the coupling between the power limits of section and the number of running units, so as to ensure the safe and stable operation of related sections. Based on the actual data of a cross-regional interconnected power grid, the validity of the model is verified, which can promote the accommodation of clean energy across a wide range of regions, reduce the supply cost of large power system, and alleviate the pressure of safe and stable operation at the receiving system.

关键词： Hydroelectric power generation HVDC transmission Schedules smart grids Dispatching Vibrations

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Identification Methods for Transformer Turn-to-Turn Faults and Inrush Current Based on Electrical Information

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Journal of Physics: Conference Series 2022年第1期2215卷

作者： Xinyi Gong Yuping Zheng Shuyan Pan Chonghao Wu Jinzhao Deng NARI Research Institute NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China State Key Laboratory of Smart Grid Protection and Control

power transformer is the most imperative and crucial equipment in electrical power system. Accurately monitoring the occurrence of transformer faults and rapidly isolating the faults are of great significance to ensure the reliability of power supply and avoid serious damage to the transformer. There are many methods used in the transformer to monitor transformer running state. This paper provides a comprehensive overview of transformer turn-to-turn fault and inrush current identification methods based on electrical information, and expounds the systematic research content that needs to be carried out for transformer turn-to-turn fault identification methods based on magnetic flux leakage information.

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A Method to Prevent and control the Interruption Exception of Sampling in Merging Unit

A Method to Prevent and Control the Interruption Exception o...

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Sustainable power and Energy Conference (iSPEC)

作者： Rui Cao Zhaohui He Tonghua Wu Bin Zhou Zhonglang Wang Xindong Li State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

As the sampling interruption is the heartbeat of merging unit, its stability is directly related to the accuracy and discreteness of the output SV packets of merging unit. To prevent the output error from merging unit when its sampling interruption is abnormal, this paper proposes crystal frequency monitoring technology, sampling interruption monitoring technology and SV packets timing monitoring technology, forming the prevention and control system of sampling interruption exception of merging unit. The merging unit developed by above technology has the function of early warning and processing for the occasional sampling interruption exception, which improves the reliability of intelligent substation operation.

关键词： Substations Heart beat Merging Crystals Reliability engineering Synchronization Monitoring

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Non-intrusive monitoring and disaggregation of industrial load based on Petri net theory

Non-intrusive monitoring and disaggregation of industrial lo...

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第三届材料科学应用与能源材料国际研讨会

作者： Wei Zheng Jie Yu Hongjie Tian Peng Li Chenning Wu Mengfu Tu School of electrical engineering Southeast University State Key Laboratory of Smart Grid Protection and Control

In this paper, the non-intrusive monitoring and disaggregation method of industrial load based on Petri net theory is studied. First, the basic concepts of Petri nets are introduced. On the basis of prototype Petri nets, time factor is added. Then, the Petri net with time factor is combined with industrial load production process. Considering the production sequence, start-stop time and production time constraints of industrial load, a non-intrusive monitoring and disaggregation model of industrial load is constructed. Finally, according to the actual production process of industrial load, the electricity consumption situation of each production link is calculated, and the detailed analysis results of industrial user's electricity consumption behavior are obtained. The research could provide an important reference for realization of friendly interaction between industrial users and power grid.

关键词： Non-intrusive monitoring and disaggregation of industrial load based on Petri net theory Petri net

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Self-healing anti-corrosion coatings: A mechanism study using computational materials science

Electrical Materials and Applications

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Electrical Materials and Applications 2024年第1期1卷

作者： Luyao Huang Weiting Chen Wenkui Hao Jinke Wang Xin Guo Lingwei Ma Dawei Zhang State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China National Materials Corrosion and Protection Data Center University of Science and Technology Beijing Beijing China

Self-healing coatings possess the remarkable ability to autonomously mend damages and restore their corrosion protection capabilities, which are compromised due to environmental influences or external forces. The progression of computational materials science has significantly bolstered theoretical explorations into self-healing anti-corrosion coatings. Such inquiries enhance our grasp of self-healing mechanisms, refine coating efficacy, and curtail the expenditures associated with empirical approaches. The research advancements in computational materials science for self-healing coatings are reviewed here. It delineates the theoretical elucidation of self-healing mechanisms through the lens of molecular dynamics, density functional theory, Monte Carlo simulations, and finite element analysis. The computational exploration of intrinsic self-healing coatings primarily involves dynamic reversible covalent bonds, dynamic reversible non-covalent bonds, and shape memory effect; whereas, extrinsic self-healing coatings concentrate on the modalities of film-forming substances and the adsorption behaviours of corrosion inhibitors. These simulation techniques not only shed light on the self-healing processes at a microscopic scale but also enable the prediction and enhancement of the macroscopic performance attributes of the coatings in practical applications. The merits and constraints of these computational simulation methodologies when applied to self-healing coatings are critically assessed. Looking ahead, efforts will be directed towards a more profound amalgamation of computational simulations, empirical investigations, and artificial intelligence. This will pave the way for creating a comprehensive database cataloguing the self-healing properties of coatings, thereby streamlining material selection and design with greater efficiency.

关键词： anti-corrosion coating computational materials science corrosion inhibitor density function theory finite element analysis microcapsules molecular dynamics self-healing

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Testing of Ethernet Function of Domestically-made FPGA Chip and Acquisition Board for the Application of Protective Relaying

Testing of Ethernet Function of Domestically-made FPGA Chip ...

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2021 International Conference on power System Technology, powerCON 2021

作者： Wang, Bin He, Xiaocai Jiang, Yingjie Lv, Xinquan Zhou, Zhimei Feng, Chen Dong, Xinzhou Tsinghua University Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electric Engineering Beijing China Communication Transmission Center Information Telecommunications Company State Grid Shandong Electeic Power Company Jinan China Chip Design Center Beijing Smartchip Microelectronics Technology CO. Ltd Beijing China Smart Shine Microelectronics Technology CO. Ltd Chip Product Department Beijing China

ISBN: (纸本)9781665407373

In order to solve the problem that the core chips of domestic protective relaying devices generally rely on foreign imported chips and realize the localized replacement of FPGAs, this paper designs the verification peripheral circuits of domestic FPGA chip through the analysis of the structure and test schemes design of domestic FPGA, including board-level verification scheme and data flow control verification scheme. The communication test and random test are carried out to the IP core of domestic FPGA MAC controller. From the test results, it can be seen that the loopback data and the transmitted data in the descriptor are consistent, and the tested domestic FPGA can be competent for its role in the application of protective relaying. © 2021 IEEE.

关键词： Field programmable gate arrays (FPGA)

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