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2022 Chinese Automation Congress, CAC 2022

作者： Liu, Jiajun Xia, Weiguo Li, Fuqiang Wang, Peng China National Aeronautical Radio Electronic Research Institute National Key Laboratory of Science and Technology on Avionics System Integration China Dalian University of Technology Key Lab. of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education School of Control Science and Engineering China

ISBN: (纸本)9781665465335

This paper studies the task assignment problem of a multi-robot system with complex constraints including the robot speed limit, the task execution time window constraints, the arrival time, the trip cost, and different priorities of the tasks. A new bidding function is then designed for each robot. Based on the k-means algorithm, a hierarchy-based extended consensus-based bundle algorithm (CBBA) is proposed to find the optimal solution for the task allocation problem. Finally, simulation examples are presented to show the feasibility of the proposed algorithm and comparisons with existing algorithms show that the proposed algorithm can reduce the task assignment time with guaranteed reward values. © 2022 IEEE.

关键词： Multipurpose robots

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Direct multi-hop time synchronization with constructive interference

Direct multi-hop time synchronization with constructive inte...

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11th ACM/IEEE Conference on Information Processing in Sensing Networks, IPSN'12

作者： Wang, Yin Pan, Gaofeng Huang, Zhiyu MOE Key Lab. for Information System Security School of Software TNLIST China Science and Technology on Communication Information Security Control Laboratory China Institute of Software Chinese Academy of Sciences China

ISBN: (纸本)9781450312271

Multi-hop time synchronization in wireless sensor networks (WSNs) is often time-consuming and error-prone due to random time-stamp delays for MAC layer access and unstable clocks of intermediate nodes. Constructive interference (CI), a recently discovered physical layer phenomenon, allows multiple nodes transmit and forward an identical packet simultaneously. By leveraging CI, we propose direct multi-hop (DMH) time synchronization by directly utilizing the time-stamps from the sink node instead of intermediate nodes, which avoids the error caused by the unstable clock of intermediate nodes. DMH doesn't need decode the flooding time synchronization beacons. Moreover, DMH explores the linear regression technique in CI based time synchronization to counterbalance the clock drifts due to clock skews. © 2012 ACM.

关键词： Synchronization

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Design of driving power supply with high isolation and small coupling capacitance based on current transformere

Design of driving power supply with high isolation and small...

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2019 International Conference on Civil Engineering, Environment Resources and Energy Materials, CCESEM 2019

作者： Zhang, Daojian Xiong, Lan Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Hubei Province Wuhan430068 China

General drive power supply can not meet the requirements of high-voltage isolation under high-voltage and high-frequency (HV-HF) conditions, and the larger coupling capacitance of general power supply will bring common-mode noise. In this paper, a 10kV isolation power supply with 1.55pF low coupling capacitance and multiple output is designed. The power supply adopts LCL-T resonant circuit to produce a 100kHz current source. The current transformer is used to isolate the power supply, which realizes high voltage isolation and small coupling capacitance. The number of output circuits is changed by increasing or decreasing the magnetic core. © Published under licence by IOP Publishing Ltd.

关键词： Resonant circuits

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Simulation and implementation of DPWM algorithm for NPC three-level inverter 2

Simulation and implementation of DPWM algorithm for NPC thre...

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2nd International Conference on Computer Information Science and Application Technology, CISAT 2019

作者： Hang, Xia Jie, Zhang Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Hubei Province Wuhan430068 China

The application of discontinuous pulse width modulation (DPWM) in high-power inverters can effectively improve the equivalent switching frequency of the inverter and improve the control performance of the system. In this paper, the DPWM3 algorithm of NPC type three-level inverter is researched in detail from the judgment of the sector where the reference vector is located, the calculation of the action time of the space vector, and the selection of the switching sequence. Finally, simulation and experimental results verify the rationality of the proposed algorithm. It provides a certain reference value for the research of NPC three-level inverter discontinuous pulse width modulation algorithm. © Published under licence by IOP Publishing Ltd.

关键词： Pulse width modulation

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AHP effectiveness evaluation of electronic warfare command and control system under complex electromagnetic environment

AHP effectiveness evaluation of electronic warfare command a...

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4th International Conference on Materials Science and Information Technology, MSIT 2014

作者： Wang, Guo-Sheng Qi, Zong-Feng The State Key Lab. of Complex Electromagnetic Envi. Effects on Electronics and Information System Luoyang 471003 China Department of Control Engineering Academy of Armored Forces Engineering Beijing 100072 China

ISBN: (纸本)9783038351733

The effectiveness evaluation problem of electronic warfare command and control system (EWCCS) under complex electromagnetic environment is investigated by using the analytic hierarchy process (AHP) method. First, the evaluation hierarchy structures of EWCCS under complex electromagnetic environment are put forward and can be classified into target hierarchy, rule hierarchy and scheme hierarchy. Then, the AHP Algorithm is given as a preliminary knowledge to evaluate the effectiveness evaluation of EWCCS under complex electromagnetic environment. Finally, an effectiveness evaluation example of EWCCS under complex electromagnetic environment is considered by using AHP Algorithm. © (2014) Trans Tech Publications, Switzerland.

关键词： Analytic hierarchy process

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A method for blind identification of single user MIMO signal in step by step

A method for blind identification of single user MIMO signal...

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4th International Conference on Wireless and Mobile Communications, ICWMC 2008

作者： Chen, Qinghua Xie, Xianzhong Institute of Personal Communication MII Key Lab. of Mobile Communication Technology Chongqing University of Posts and Telecommunications Chongqing 400065 China National Defense Key Laboratory of Telecommunication System Information and Control Technology Jiaxing 314033 China

ISBN: (纸本)9780769532745

This paper constructed signal models of four types of signal in wireless communication, i.e. single user MIMO signal, single user single antenna signal, virtual MIMO signal and multibeam smart antenna signal first, and then proposed a method for blind identification of single user MIMO signal in step by step in noncooperation communication, when the unknown source was one of the four types by using MUSIC algorithm and Forward-backward Spatial Smoothing algorithm to blindly estimate DOAs of the received signal in the first two steps, and use blind channel estimation in the third step. Simulation results show the feasibility of this method. There has not been any published literature reporting research results about this topic yet, so the results of this paper is of important value in both theory and application. © 2008 IEEE.

关键词： Multiple signal classification

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Multi-swing stability assessment approach based on variation rate of transient energy for power systems

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2007年第16期27卷 13-18页

作者： Song, Fang-Fang Bi, Tian-Shu Yang, Qi-Xun Key Lab. of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

The lack of quantitative stability analysis software for power system is one of the main reasons for losing good chance to implement the emergency control and even finally resulting in the large outage. Recently, the rapidly developing wide area measurement system (WAMS) gives a new way for quick on-line quantitative transient stability assessment. Starting with the single machine energy function, the relationship between the variation rate of transient unbalance energy and multi-swing stability was analyzed in detail, and the corresponding characteristic of the variation rate of transient energy was proved. Then, a new multi-swing stability assessment criterion based on WAMS was proposed. Numerical simulations were conducted on 6-machine 22-bus system of China electric power research institute to demonstrate the effectiveness of this criterion.

关键词： Electric power systems

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Flow transferring identification algorithm for multi-branches removal event with consideration of transient phenomena

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2007年第16期27卷 24-30页

作者： Xu, Hui-Ming Bi, Tian-Shu Huang, Shao-Feng Yang, Qi-Xun Key Lab. of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

Cascading trips caused by flow transferring are the crucial causation of a lot of well-known blackouts. It severely threatens the security and reliability of power systems. Flow transferring relativity factor (FTRF) is extended from single branch removal event to multi-branches removal event. According to refraction and reflection process of flow transferring, the calculation formula of FTRF for multi-branches chain removal event is deduced. Moreover, by using the relationship of node injection currents and branch currents, a method of post-fault branch current estimation and a flow transferring identification algorithm based on WAMS to distinguish flow transferring in transient period is presented. The simulation results of 10-generator 39-bus New England system show that the proposed estimation method and the identification algorithm work well.

关键词： Electric power systems

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Secure routing protocol based on probability in sensor networks

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Xi'an Dianzi Keji Daxue Xuebao/Journal of Xidian University 2011年第6期38卷 1-7页

作者： Tang, Di Yang, Xiaoniu Li, Jiandong State Key Lab. of Integrated Service Networks Xidian Univ. Xi'an 710071 China National Lab. of Information Control Tech. for Communication System Jiaxing 314033 China

In wireless sensor networks, the traditional intrusion detection can not detect the compromised nodes immediately. In this paper, we propose a secure routing protocol (Secure Relay Grid Routing Protocol) based on probability prediction to solve this problem. In the protocol, the network is divided into different small grids. Utilizing the geographic information and intrusion detection information, the proposed protocol is designed with a routing metric which is based on a mathematical prediction model. The routing metric could guarantee that the message detours those compromised grids that have not been detected by the intrusion detection. Theoretical analysis and OPNET simulation results show that the proposed protocol can provide a high delivery ratio and decrease the number of the compromised packets.

关键词： Intrusion detection

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High performance control Strategy for an Isolated Three-Phase Bidirectional AC/DC Converter

High performance Control Strategy for an Isolated Three-Phas...

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International Conference on Power Electronics and Drive systems (PEDS)

作者： Yixiong Zhou Chunguang Ren Wenping Qin Xiaoqing Han Peng Wang Baifu Zhang Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China

This paper proposes a novel control strategy consisting of dual-phase-shifting (DPS) plus variable frequency for front-end dual-active-bridge (DAB) and 33% pulse width modulation (PWM) for three-phase inverter. The primary goal is to realize the linear control of output power which will reduce the control complexity and improve dynamic response, while at the same time achieving a high-efficiency bidirectional DAB inverter. A model has been built and tested using the proposed strategy on MATlab.Simulink. The simulation result verified the validity of the proposed strategy.

关键词： Inverters Pulse width modulation AC-DC power converters control systems Frequency control Power generation Power systems

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