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Mechanical Engineering and Aerospace Engineering (MEAE), Asia Conference on

作者： Zeng Hanhan Gu Zhichao Huang Jian Flight Control System Dept. State Key Laboratory of Airliner Integration Technology and Flight Simulation COMAC Shanghai Aircraft Design & Research Institute Shanghai China

ISBN: (数字)9798350352252

ISBN: (纸本)9798350352269

In view of the force fight problem caused by the active-active-active working mode of fly-by-wire flight control system, a servo control actuator and force fight mitigation model is established by AMEsim, and a new force fight balance strategy is proposed. The balance strategy combines the force situation of control surface, using a new force fight calculation method and simulates with the PI equalization algorithm. In the worst case, DDP can be reduced from 451bar before optimization to 371bar after optimization, which is reduced by 17.7% The simulation model verifies the feasibility of the force fight balance strategy, and can provide a theoretical basis for the design and optimization of the later force fight balance.

关键词： Employee welfare Actuators Prevention and mitigation Atmospheric modeling simulation Force Servomotors Mechanical engineering Optimization Aerospace control

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Fault Location Method for Dc Distribution Network Based on Compressed Sensing Group Sparse Representation

SSRN

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SSRN 2024年

作者： Wang, He Liu, Yiqi Li, Shiqiang Yu, Huanan Bian, Jing Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Northeast Electric Power University Ministry of Education Jilin Province Jilin132012 China

The common faults in a direct current (DC) distribution network consist of pole-to-pole faults and pole-to-ground faults. Under conditions of sparse configuration of measurement devices, existing fault location methods are unable to simultaneously locate pole-to-ground faults and pole-to-pole faults, and issues such as indistinct fault characteristics under the influence of transition resistance and noise are encountered. In response to these challenges, a fault location method for DC distribution networks is proposed based on compressed sensing group sparse representation. Firstly, the pole-to-mode transformation is utilized to convert the positive and negative pole electrical quantities of the DC distribution network into zero-mode and one-mode electrical quantities. Equivalent circuits for pole-to-ground faults and pole-to-pole faults are established separately, enhancing the fault characteristics corresponding to the two different short circuit faults. Secondly, the obtained impedance matrices for zero-mode and one-mode are constructed into a group sparse dictionary. By utilizing compressed sensing group sparse representation, the sparse current vector of high-frequency mode quantities is obtained, enabling the correct identification of fault types and accurate location of fault sections. Finally, a simulation model of the DC distribution network is built on the PSCAD platform to validate the effectiveness of the proposed fault location method. © 2024, The Authors. All rights reserved.

关键词： Electric power distribution

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Practical Research on On-Line Monitoring and control Function Module of Relay Protection in Smart Substation 18

Practical Research on On-Line Monitoring and Control Functio...

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

作者： Huang, Zhida Wu, Wencong Cai, Haiqing Huang, Libin State Key Laboratory of HVDC Electric Power Research Institute CSG Guangzhou510663 China National Energy Power Grid Technology R&D Centre Guangzhou510663 China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou510663 China CSG Key Laboratory for Power System Simulation Guangzhou510663 China

ISBN: (数字)9781839537615

ISBN: (纸本)9781839537615

At present, the power grid is carrying out the practical work of smart substation On-line monitoring and control function module of relay protection. Compared with traditional substations, the new-generation assurance system has been greatly improved in 7 functional modules, including fault archiving, special maintenance information patrol, fixed value checking, configuration checking, substation testing, intelligent alarm, and master station modeling. It can fully adapt to the functional requirements of smart substations and traditional substations. This paper analyzes the monitoring and analysis requirements of the assurance system based on the equipment configuration of the station control layer of the new generation of intelligent substations, and proposes a complete design scheme of seven functional modules from three aspects: functional requirements, implementation logic, and performance design. The practical application results in the power grid simulation laboratory show that the On-line monitoring and control function module of relay protection based on the guarantee system can be compatible with the traditional 103 substations and 61850 substations and achieve the expected goals and performance requirements. It has the value of promotion and application. © ACDC 2022. All rights reserved.

关键词： Relay protection

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Emergency Direct Current Power Support for High-Percentage Renewable Energy systems Based on Deep Reinforcement Learning

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SSRN 2024年

作者： Sun, Zhenglong Zhuang, Junzhi Chao, Pan Chao, Jiang Cai, Guowei The Department of Electrical Engineering Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China

As a low-cost emergency frequency control method, emergency direct current power support (EPS) is crucial for frequency stabilization of alternating current (AC)–direct current (DC) hybrid systems. In the context of highly integrated renewable energy sources, the uncertainty of AC-DC hybrid systems increases and the inertia decreases during the transition process, and the existing EPS methods face prominent adaptation and mismatch problems in meeting the frequency restoration requirements. To fill this gap, this study proposes a deep reinforcement learning (DRL)-based EPS frequency control method. The EPS decision is transformed into a Markov decision process (MDP) and solved using the proximal policy optimization (PPO) algorithm. This paper designs a DRL reward function for EPS while taking into account the EPS line overload and phase change failure problems. In order to solve the contradiction between limited observation and global safety, this paper designs a data characterization method based on mechanism fusion. Meanwhile, this paper develops an open-source power system simulation platform with DRL control function by using Python and the power system simulation software DIgSILENT/PowerFactory to realize the EPS frequency stabilization decision based on DRL control. Through a case study of the IEEE 39-bus system and a real power system in Northwest China, it is verified that the proposed DRL-based EPS agent is able to quickly, accurately, and securely restore the frequency and reduce the frequency oscillations while considering the security constraints. © 2024, The Authors. All rights reserved.

关键词： Reinforcement learning

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Advanced Out-of-Step Splitting Protection simulation Platform with Considering High Frequency Generation Tripping and Low Frequency Load Shedding

Advanced Out-of-Step Splitting Protection Simulation Platfor...

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2022 IEEE International Conference on Power systems and Electrical Technology, PSET 2022

作者： Liu, Ren Zhu, Yukun Zhu, Yihua Chang, Dongxu Wu, Mingkang Huang, Libin a. State Key Laboratory of HVDC b. National Energy Power Grid Technology R&D Centre c. Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System d. CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781665489157

This paper presents an advanced out-of-step (OOS) splitting protection simulation platform considering high frequency generation tripping and low frequency load shedding. In the proposed simulation platform, Real-Time Digital Simulator (RTDS) is utilized as the real-time power system simulator. Through the high-speed I/O card, real industry OOS splitting protection device is integrated into the proposed simulation platform. Based on the real China South Power Grid (CSG) control strategy, high frequency generation tripping and low frequency load shedding components are modelled in the simulation. CSG real grid is modelled in the RTDS to perform the Real-time hardware-in-the-loop simulation. simulation results present that there is a clear difference between with high frequency generation tripping results and without high frequency generation tripping results. © 2022 IEEE.

关键词： simulation platform

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Agile development technology of test application program suitable for semiconductor device testing

Agile development technology of test application program sui...

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2020 International Conference on Communications, Information system and Software Engineering, CISSE 2020

作者： Yan, Tao Guo, Min Zhu, Xuebo Yang, Yang China Electronics Technology Instruments Co. Ltd Qingdao266555 China Key Laboratory of Navigation System Simulation and Testing Technology Qingdao266555 China

The semiconductor devices (especially integrated circuits/chips) test field involves a wide range of device types and test parameters, which leads to low development efficiency, poor stability, weak reuse, long development cycle and repetitive work in application development. Therefore, a test application development method based on reusable component technology is proposed in this paper. Firstly, this paper introduces the basic concepts and characteristics of the reusable component technology. Then, according to the current situation of semiconductor device testing, the design method of component-based test application program is described. Finally, the typical semiconductor device test application program is designed and developed by using LabWindows/CVI integrated development environment. Practice has proved that the component-based test application program design can speed up the R&D and ensure the software quality at the same time. The agile development requirement of application program for semiconductor device test system can be satisfied. © 2021 Journal of Physics: Conference Series.

关键词： Application programs

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A Noise Filter for Dynamic Vision Sensor Based on Spatiotemporal Correlation and Hot Pixel Detection

A Noise Filter for Dynamic Vision Sensor Based on Spatiotemp...

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International Conference on Autonomous Unmanned systems, ICAUS 2021

作者： Xu, Ninghui Zhao, Jiajia Ren, Yuan Wang, Lihui Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology Ministry of Education School of Instrument Science and Engineering Southeast University Nanjing210096 China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing100074 China

ISBN: (纸本)9789811694912

As a new type of neuromorphic sensor, the events-driven Dynamic Vision Sensor (DVS) has the advantages of low latency and wide dynamic range. The development of DVS overcomes the application limitations of traditional cameras in the field of high speed robots and autonomous driving. However, there are abundant unwanted noise events contained in the output of DVS, which severely affects the subsequent data-processing. To tackle the problem, a novel noise filter for DVS is proposed in this paper. Firstly, since the noise is composed of hot pixel events with high-frequency and random background activities, a time window is constructed to continuously detect hot pixels. Secondly, a spatiotemporal correlation-based denoising approach for each incoming event is conducted, while excluding its surrounding hot pixels, to avoid the negative effect caused by their high temporal correlation on the filter. Finally, the hot pixels are compensated with the events that are most probably to occur depending on the adjacent events, to achieve the completeness and precision of the output event stream. Experiments in different scenes demonstrate that the proposed noise filter can effectively eliminate the noise from the event stream of DVS and obviously outperforms the baseline method. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Pixels

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Analysis and suppression of low-frequency oscillation of photovoltaic cells with inertia control 6

Analysis and suppression of low-frequency oscillation of pho...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Wang, Zhenyang Yan, Gangui Zhao, Yue Peng, Jili Wang, Dazhong Ren, Shuang Northeast Electric Power University Key Laboratory of Modern Power System Simulation Control and Green Power Technology Dept. Ministry of Education Jilin China State Grid Hunan Power Supply Dept. State Grid Hengyang Power Supply Branch Hunan China

ISBN: (纸本)9798350346671

Aiming at the problem of low-frequency oscillation when photovoltaic power generation is connected to weak AC system, a linearization model of photovoltaic power generation is established, which ignores current inner loop and considers inertia control. The influence of various leading factors on low-frequency oscillation modes of photovoltaic power generation is analyzed. Finally, a low-frequency oscillation stabilizer (SSDC) is designed according to the phase compensation method to suppress the low-frequency oscillation of power system. The results show that the increase of input power of DC capacitor and the decrease of proportional control parameters of DC voltage loop and PLL will lead to the decrease of system damping and stability. Finally, the electromagnetic simulation model of weak AC system with photovoltaic power generation is built on PSCAD/EMTDC platform, which verifies the validity of eigenvalue analysis results and SSDC. © 2023 IEEE.

关键词： simulation platform

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Design and Development of New Solid-state DC Circuit Breaker 6

Design and Development of New Solid-state DC Circuit Breaker

引用

6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Zhong, Jianying Deng, Yuan Yan, Xin Qu, Lu Fan, Naiyuan Feng, Jian Gan, Zhizheng Pinggao Group CO. Ltd Pingdingshan China Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Beijing China Dc Research Center Sichuan Energy Internet Research Institute Tsinghua University Chengdu China

ISBN: (纸本)9798350346671

Solid-state DC circuit breakers are key equipment for the protection of medium and low voltage DC systems and are the most effective means of isolating short-circuit faults. With the development of high-power power electronics, the performance of solid-state DC circuit breakers has also improved. In this paper, a new topology of anti-parallel connection is proposed based on the reverse blocking IGCT, which requires fewer switches, lower cost and smaller loss than the anti-series and diode-bridge structure. Besides, a snubber branch design method based on MOV-C is proposed, which can effectively suppress the breaking overvoltage and AC harmonics. Finally, a prototype of low-voltage solid-state DC circuit breaker with rated voltage of 750V was developed, and the breaking test and temperature test were carried out. © 2023 IEEE.

关键词： Electric circuit breakers

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Oxidation Mechanism and Toxicity Evolution of Linalool,a Typical Indoor Volatile Chemical Product

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Environment & Health 2024年第7期2卷 486-498页

作者： Zihao Fu Song Guo Ying Yu Hong-Bin Xie Shiyu Li Daqi Lv Putian Zhou Kai Song Zheng Chen Rui Tan Kun Hu Ruizhe Shen Maosheng Yao Min Hu State Key Joint Laboratory of Environmental Simulation and Pollution Control International Joint Laboratory for Regional Pollution ControlMinistry of Education(IJRC)College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Nanjing University of Information Science&TechnologyNanjing 210044China Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China Institute for Atmospheric and Earth System Research/Physics Faculty of ScienceUniversity of HelsinkiP.O.Box 64FIN-00014 HelsinkiFinland

Linalool,a high-reactivity volatile chemical product(VCP)commonly found in cleaning products and disinfectants,is increasingly recognized as an emerging contaminant,especially in indoor *** the gas-phase oxidation mechanism of linalool is crucial for assessing its impact on atmospheric chemistry and human *** quantum chemical calculations and computational toxicology simulations,we investigated the atmospheric transformation and toxicity evolution of linalool under low and high NO/HO_(2)·levels,representing indoor and outdoor *** findings reveal that linalool can undergo the novel mechanisms involving concerted peroxy(RO_(2)·)and alkoxy radical(RO·)modulated autoxidation,particularly emphasizing the importance of cyclization reactions *** expands the widely known RO_(2)·-dominated H-shift-driven autoxidation and proposes a generalized autoxidation mechanism that leads to the formation of low-volatility secondary organic aerosol(SOA)*** analysis shows that over half of transformation products(TPs)exhibited higher carcinogenicity and respiratory toxicity compared to *** also propose time-dependent toxic effects of TPs to assess their long-term *** results indicate that the strong indoor emission coupled with slow consumption rates lead to significant health risks under an indoor *** results highlight complex indoor air chemistry and health concerns regarding persistent toxic products during indoor cleaning,which involves the use of linalool or other VCPs.

关键词： volatile chemical products(VCPs) peroxy radicals(RO_(2)·) atmospheric autoxidation secondary organic aerosol(SOA) computational toxicology

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