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2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

作者： Zhang, Hualu Deng, Boya Shi, Jie Northeast Electric Power University Jilin Key Laboratory of Modern Power System Simulation Control and Green Power New Technology Ministry of Education Jilin China Nanjing Nanrui Information Communication Technology Co. Ltd. Nari Group Corporation State Grid Electric Power Research Institute Nanjing China

ISBN: (纸本)9781665414395

Accurate forecasting of day-ahead electrical load is a key to optimize the operation of the integrated energy system (IES) and a fundamental function of the cyber-physical system (CPS) of IES. Due to the characteristics of different features, data collected by CPS often have different sampling frequencies, resulting in mining data trends inadequately when making a load forecast. This paper proposes an GRU-based model to combine historical data with different sampling frequencies in forecasting day-ahead building-level load. First, day-level features are clustered by K-means. Hour-levels features are then partitioned according to clustering results and inputted separately into a gated recurrent unit (GRU) based neural network to capture relationships between external features and load fluctuations. The temporal dependencies of minute-level data are captured by the GRU network directly without any external features. Finally, the least square method is used to combine forecasting results at each hour of two models. The simulation results present that the proposed model performs better than a single model when applying to real-world data. © 2021 IEEE.

关键词： Forecasting

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Phase-Based Testability Analysis of Multi-Function Integrated Rf system Using Generalized Stochastic Petri Net

SSRN

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SSRN 2024年

作者： Zhang, Chao Cui, Changkai Zhou, Dingyu Dong, Zhijie He, Shilie Zhou, Zhenwei Department of Integrated Technology and Control Engineering School of Aeronautics Northwestern Polytechnical University Xi’an710072 China National Key Laboratory of Aircraft Design Xi’an710072 China School of Civil Aeronautics Northwestern Polytechnical University Xi’an710072 China Shanghai Civil Aviation Control and Navigation System Co. Ltd Shanghai201100 China The 6th Research Institute of China Electronics Corporation Beijing102209 China China Electronic Product Reliability and Environmental Testing Institute Guangzhou510610 China

Multi-Function Integrated RF system (MIRFS) is a crucial part of an aircraft's airborne systems. Unlike disposable equipment such as missiles and torpedoes, MIRFS has to face two different operating environments, ground and air, during a mission cycle. In these two operating environments, the test equipment and data processing methods are different. These differences bring problems with test information not being fully utilized and testability indexes not being accurately calculated. Traditional testability modelling and analysis method cannot deal with the above problems. In this paper, a phase-based testability modelling and analysis method using generalized stochastic Petri net (GSPN) is proposed to fully use test information and determinate accurate testability indexes. Firstly, depending on the operating environment, two phases which are readiness phase and flight combat phase are designed to build separate testability models. Secondly, since static modelling techniques like UML and SysML lack the ability to dynamically evaluate and analyse system, GSPN is used to model the testability of each phase to better describe the MIRFS state and behavior. Then the testability models for each phase are integrated and optimised into the mission cycle GSPN testability model, which contains fully test information. The integration principle involves linking testability models according to the mission cycle sequence, including time synchronization, fault detection synchronization, and maintenance synchronization. Finally, Markov chain is used to solve the mission cycle GSPN model and obtain the precise testability indexes. The testability indexes obtained effectively enhances the testability of the MIRFS. This method can also be used when there are more phases of the mission. © 2024, The Authors. All rights reserved.

关键词： Synchronization

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Hierarchical Reactive Power Support Strategy of Doubly-fed Wind Farm Based on Active Disturbance Rejection control

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Smart Power 2024年第6期52卷 77-83页

作者： Gu, Shaohua Yang, Dejian Wang, Puyu Sang, Shun Key Laboratory of Modern Power System Simulation Control and New Technology of Green Electric Energy Ministry of Education Jilin132012 China School of Automation Nanjing University of Science and Technology Nanjin210094 China School of Electrical Engineering Nantong University Nantong226019 China

With the scale networking of wind power generation, voltage issues in the power system have become increasingly prominent. To improve the transient response characteristics of doubly-fed induction generator wind farm during grid faults, a hierarchical reactive power support strategy based on active disturbance rejection control (ADRC) is proposed. Firstly, the reactive power boundaries of doubly-fed induction generator (DFIG) is described. Secondly, a layered reactive power support strategy for doubly fed wind farms is designed, ADRC is utilized in the station controller to generate voltage control signals and employ variable gain coefficient assistance in unit controller to adjust the voltage. Finally, Washout filters are used to suppress transient overvoltage. A simulation model of doubly fed wind farm based on EMTP-RV is constructed. The simulation analysis shows that the proposed control strategy has good support effect when the grid voltage drops. © 2024 Zhihui Dianli Bianjibu. All rights reserved.

关键词： Disturbance rejection

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Stability Evaluation and Frequency Drift Analysis of Sub-Synchronous Oscillation in Grid-Connected PMSG Wind Turbines

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IET Generation, Transmission & Distribution 2025年第1期19卷

作者： Gangui Yan Cheng Yang Yupeng Wang Lin Yue Fu Guo Ministry of Education Key Laboratory of Modern Power System Simulation Control and Green Power Technology Department of Electrical Engineering Northeast Electric Power University Jilin China

The sub-synchronous oscillation (SSO) in grid-connected permanent magnet synchronous generators (PMSG) is a complex dynamic behaviour influenced by multiple factors. The phenomenon of SSO has the characteristic of frequency drift. Previous studies have mainly focused on the SSO stability, without further explanation of the reasons for frequency drift in SSO. In this paper, a SISO transfer function model is constructed to analyse the SSO characteristics of grid-connected PMSG. The study quantitatively analyses the impacts of grid strength, operating conditions and voltage/current control parameters on system stability and oscillation frequency based on amplitude/phase margin. It reveals the triggering mechanism of SSO instability in weak grid strength and characterises the constraining relationship between grid strength/operating conditions and the stable operational region of the system. The results demonstrate that variations in SSO frequency are predominantly influenced by control parameter settings, with a measurable variation range of up to 26.7 Hz. Finally, the effectiveness of the proposed model and the theoretical analysis results are verified through simulations.

关键词： frequency drift power system dynamic stability power system stability stability

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Responses of Nitrogen and Sulfur Deposition to Nh3 Emission Abatement in the Yangtze River Delta, China

SSRN

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SSRN 2022年

作者： Dong, Zhaoxin Wang, Shuxiao Xing, Jia Ding, Dian Ge, Xiaodong Zheng, Haotian Jiang, Yueqi An, Jingyu Huang, Cheng Duan, Lei Jiming, Hao State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing100084 China Institute for Atmospheric and Earth System Research/Physics Faculty of Science University of Helsinki Helsinki00014 Finland State Environmental Protection Key Laboratory of the Formation and Prevention of Urban Air Pollution Complex Shanghai Academy of Environmental Sciences Shanghai200233 China

NH 3 emission control has proven to be of great importance in reducing PM 2.5 concentrations in China, while how it affects nitrogen/sulfur (N/S) deposition is still unclear. This study developed a new response surface model to quantify the responses of N/S deposition to NH 3 emission control in the Yangtze River Delta, China. NH 3 control was found to have higher efficiency in reducing N/S deposition than NO x and SO 2 alone. The reduced N deposition response to NH 3 emission abatement was higher in the northern part of the YRD region, whereas oxidized N deposition decreased sharply in the region with a low N critical load. An unexpected cobenefit was found in reducing N deposition when we controlled the NH 3 and NO x emissions simultaneously. Compared with the sum effect of individual NH 3 and NO x emission abatement, the extra benefits from the synergy controls accounted for 4.4% (1.23 kg N·ha -1 ·yr -1 ) of the total N deposition, of which 81% came from the oxidized N deposition. The YRD region could receive the largest cobenefits with a 1:1 ratio of NO x :NH 3 emission reduction. The NH 3 emission control also changed the ratio of wet S deposition to dry S deposition and mitigated wet S deposition. These findings highlight the effectiveness of NH 3 emission control and suggest a multiple pollutant control strategy for reducing N/S deposition, which may also be appropriate for other regions in China and other countries. © 2022, The Authors. All rights reserved.

关键词： Ammonia

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Research on Multi-Objective Planning of Electric Vehicle Charging Stations Considering the Condition of Urban Traffic Network

arXiv

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arXiv 2022年

作者： Wang, Limeng Yang, Chao Zhang, Yi Bu, Fanjin Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin132012 China State Grid Harbin Power Supply Company Substation Secondary Maintenance Center Harbin150036 China

As an important supporting facility for electric vehicles, the reasonable planning and layout of charging stations are of great significance to the development of electric vehicles. However, the planning and layout of charging stations is affected by various complex factors such as policy economy, charging demand, user charging comfort, and road traffic conditions. How to weigh various factors to construct a reasonable model of charging station location and capacity has become a major difficulty in the field of electric vehicle charging facility planning. Firstly, this paper constructs the location and capacity optimization model of the charging station with the goal of maximizing the revenue of operators and minimizing the user's charging additional cost. At the same time, the road time-consuming index is introduced to quantify the impact of road congestion on the user's charging additional cost, so as to effectively improve the user's satisfaction during charging. Then, aiming at the charging station planning model, a non-dominated sorting genetic algorithm with an elite strategy (NSGA-Ⅱ) based on chaos initialization and arithmetic crossover operator is proposed. Finally, taking the Haidian District of Beijing as the simulation object, the results show that compared with the situation of urban traffic networks not considered, the model proposed in this paper significantly reduces the cost of lost time of users by 11.4% and the total additional cost of users' charging by 7.6%. It not only ensures the economy of the system, but also effectively improves the charging satisfaction of users, which further verifies the feasibility and effectiveness of the model, and can provide a reference for the planning and layout of charging stations in the future. © 2022, CC BY-NC-ND.

关键词： Location

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Different Switching Positions of On-Load-Tap-Changer of Converter Transformer with Delay Angle control Harmonic Current Characteristics Analysis

Different Switching Positions of On-Load-Tap-Changer of Conv...

引用

Power Science and Technology (ICPST), IEEE International Conference on

作者： Zelang Wang Weiju Dai Dexu Zou Zhihu Hong Qiyuan Cui Jianping Hu Ning Zhang Jixiang Wang Yunnan Power Grid Co. Ltd Kunming China Electric Power Research Institute Yunnan Power Grid Co. Ltd Kunming China Chuxiong Power Supply Co. Yunnan Power Grid Co. Ltd Chuxiong China Yuxi Power Supply Co. Yunnan Power Grid Co. Ltd Yuxi China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China State Key Laboratory of Power Transmission Equipment &System Security and New Technology Chongqing University Chongqing China

ISBN: (数字)9798350349030

ISBN: (纸本)9798350349047

The fundamental components of the UHV DC transmission control system, which are essential to the reliable functioning of the HVDC transmission system, are converter valve delay angle control and converter transformer on-load tap-changer (OLTC) control. However, the converter's harmonic current change rule is directly impacted by the intricate regulatory approach. Thus, using the line commutated converter (LCC) type conventional DC transmission system as an example, we build a control circuit model of delay angle control coupled with tap control in this paper. Current and minimum α angle are constant for the rectifier side, and current and γ angle are constant for the inverter side. The current waveform of the converter transformer network and valve side during the voltage boost and buck process is examined by turning the tap. The findings of the simulation demonstrate that the current waveform's degree of distortion varies with various tapping, with the most severe waveform distortion occurring during the boost operation, which has localized sharp waves and a high harmonic content. Conversely, there is less harmonic content and the waveform tends to be more regular.

关键词： Gears Harmonic analysis Transformers control systems Distortion Valves Delays

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Using poisson disk sampling to render oil particles at sea

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Journal of Computing and Information Technology 2019年第4期27卷 31-45页

作者： Do, Vancuong Ren, Hongxiang Key Laboratory of Marine Simulation and Control for Ministry of Communications Dalian Maritime University Dalian China Faculty of Navigation Vietnam Maritime University Haiphong Viet Nam

Fluid simulation is one of the most complex tasks in three-dimensional simulation. Specifically, in the case of oil spills at sea, the oil film constantly interacts and is influenced by the environment, thus making its composition and properties change over time. In this paper, we tackle this problem by using both Lehr's spreading model and Hoult's drifting model to build the oil spill physical model. Unlike previous studies that only applied the Poisson disk algorithm to static and solid objects, we applied it in a three-dimensional space to divide the oil film into fluid particles. The track of oil particles under the influence of waves, wind, and currents is rendered by the Unity3D tool with C# programming language, which vividly and realistically simulates the collision of oil particles on the ocean scene with obstacles such as buoys and small islands. The result of this research can be used to predict oil spill direction, thus providing the solution to respond and minimize the damage caused by oil spills at sea. We also discuss some improvements to our model by using the Marching cube algorithm to render the Metaball model. © 2019 University of Zagreb.

关键词： Oil spills

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Pathways of China's PM2.5 air quality 2015–2060 in the context of carbon neutrality

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National Science Review 2021年第12期8卷 63-73页

作者： Jing Cheng Dan Tong Qiang Zhang Yang Liu Yu Lei Gang Yan Liu Yan Sha Yu Ryna Yiyun Cui Leon Clarke Guannan Geng Bo Zheng Xiaoye Zhang Steven J.Davis Kebin He Ministry of Education Key Laboratory for Earth System Modelling Department of Earth System ScienceTsinghua University Department of Earth System Science University of California Chinese Academy of Environmental Planning Joint Global Change Research Institute Pacific Northwest National LaboratoryUniversity Research Court Center for Global Sustainability School of Public PolicyUniversity of Maryland State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua University Institute of Environment and Ecology Tsinghua Shenzhen International Graduate SchoolTsinghua University State Key Laboratory of Severe Weather&Key Laboratory of Atmospheric Chemistry of CMA Chinese Academy of Meteorological Sciences

Clean air policies in China have substantially reduced particulate matter(PM2.5) air pollution in recent years,primarily by curbing end-of-pipe ***,reaching the level of the World Health Organization（WHO） guidelines may instead depend upon the air quality co-benefits of ambitious climate ***,we assess pathways of Chinese PM2.5air quality from 2015 to 2060 under a combination of scenarios that link global and Chinese climate mitigation pathways(*** 2℃-and 1.5℃-pathways,National Determined Contributions（NDC） pledges and carbon neutrality goals) to local clean air *** find that China can achieve both its near-term climate goals（peak emissions） and PM2.5air quality annual standard（35 μg/m3） by 2030 by fulfilling its NDC pledges and continuing air pollution control ***,the benefits of end-of-pipe control reductions are mostly exhausted by 2030,and reducing PM2.5exposure of the majority of the Chinese population to below 10 μg/m3by 2060 will likely require more ambitious climate mitigation efforts such as China' s carbon neutrality goals and global1.5℃-*** results thus highlight that China's carbon neutrality goals will play a critical role in reducing air pollution exposure to the level of the WHO guidelines and protecting public health.

关键词： clean air policy carbon neutrality synergy pathway air quality standards WHO guidelines

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Risk Analysis of Lateral Collision of Military and Civil Aviation Aircraft Based on Event Model 1

引用

International Conference on Artificial Intelligence in China, ChinaAI 2019

作者： Zhao, Guhao Mao, Shaojie Mao, Yi Zhang, Xiaoqiang Wu, Yarong State Key Laboratory of Air Traffic Management System and Technology NanjingJiangsu210007 China Air Traffic Control and Navigation College Air Force Engineering University Xi’anShaanxi710077 China

ISBN: (数字)9789811501876

ISBN: (纸本)9789811501869

Collision risk analysis is an important part of airspace safety assessment. Based on Event model, the lateral position deviation probability of military aircraft is calculated. Combining with the probability model of lateral position deviation of civil aviation aircraft, the frequency of military aircraft collision box passing through separation sheet in high slope circling training is calculated. A collision risk assessment model between training flying aircraft in military training airspace and aircrafts flying in civil aviation route is constructed. Through the simulation calculation of the lateral collision risk of military and civil aviation, the size, layout, and use suggestions of military high slope circling training airspace are obtained, which can provide reference for the airspace safety assessment. © Springer Nature Singapore Pte Ltd 2020.

关键词： Civil aviation

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