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Sequence impedance modeling of droop-controlled inverter 8

Sequence impedance modeling of droop-controlled inverter

引用

8th Renewable Power Generation Conference, RPG 2019

作者： Hu, You Wang, Jiajun Liu, Bin Li, Zhen Liu, Xiangdong School of Automation and Key Laboratory for Intelligent Control and Decision on Complex Systems Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9781839531255

The grid-connected three-phase inverter is an indispensable part of the microgrid. The droop control is widely used in parallel inverters for high reliability and flexibility. The output impedance of droop controlled inverters plays an vital role in its stability. However, the sequence impedance model of grid-connected inverter is currently based on the grid side converter with a single current loop control exdluding the low-frequency dynamics similar in doubly fed induction generators. Both the droop control and voltage loop control greatly affect the stability of inverter, specifically in the low frequency response. This paper proposes a sequence impedance model of inverter, which considers the droop control and voltage and current dual closed-loop control using the harmonic linearization method in the frequency domain. The accuracy of the model is verified through comparing the measurement impedance value in simulation with the impedance value calculated in the sequence impedance model. The influence of control method on system impedance is verified by showing the difference between the single loop controlled inverter and droop control inverter. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Electric inverters

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Collaborative SLAM system Based on Shared Priori Maps

Collaborative SLAM System Based on Shared Priori Maps

引用

International Conference on Guidance, Navigation and control, ICGNC 2022

作者： Wu, Chunxu Shou, Yicheng Li, Zhen Liu, Xiangdong School of Automation and Key Laboratory for Intelligent Control and Decision on Complex Systems Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9789811966125

Multi-robot system outperforms in efficiency for cooperative task, where the challenging burden of information exchange for surrounding environment is facilitated by collaborative simultaneous localization and mapping (SLAM). However, the utilization of environmental information, i.e., mapping, should be specifically put into efficient use and merged from the viewpoint of computation saving and localization accuracy improvement. Towards these issues, this paper proposes the Collaborative SLAM system based on shared priori maps which includes multi-agent initialization and a new map sharing and reuse mechanism among various active agents in an incremental way. Finally, based on the data set recorded in the actual laboratory environment, the proposed Collaborative SLAM system is evaluated from the perspectives of localization accuracy and computational power consumption. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Mapping

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Guidance law of multiple missiles engaged in cooperative salvo attack 10

Guidance law of multiple missiles engaged in cooperative sal...

引用

Joint International Conference of the 10th China-Japan International Workshop on Information Technology and control Applications and the 6th International Symposium on Computational Intelligence and Industrial Applications, ITCA and ISCIIA 2014

作者： Zeng, Jie Dou, Lihua Xin, Bin School of Automation Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing Institute of Technology Beijing100081 China

In this article, a guidance problem for cooperative salvo attack of multiple missiles against a single stationary target is investigated. The proposed guidance law combines the well-known PNG law and cooperative acceleration command, which is based on the feedback of state error between the current missile and the mean value of participant missiles. The state variable in this paper is used as the approximate calculation of time-to-go. The cooperative acceleration command is designed to adjust the flight path and impact time, which leads the multi-missiles to hit the common target simultaneously. During the engagement, the velocities of missiles are not changed and presetting impact time is not needed. Simulation results show the effectiveness of the proposed guidance law.

关键词： Electronic guidance systems

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Sensor fault diagnosis based on least squares support vector machine online prediction

Sensor fault diagnosis based on least squares support vector...

引用

2011 IEEE 5th International Conference on Robotics, Automation and Mechatronics, RAM 2011

作者： Lishuang, Xu Tao, Cai Fang, Deng School of Automation Beijing Institute of Technology Key Laboratory of Complex Systems Intelligent Control and Decision Beijing 100081 China

ISBN: (纸本)9781612842509

In order to solve the challenging problem of diagnosis for sensor bias and drift faults, a method of sensor fault diagnosis based on the least squares support vector machine (LS-SVM) online prediction is proposed. In the paper, the real-time outputs of the sensor are made full use to establish LS-SVM prediction model. Through the residual which is obtained by comparing the outputs of LS-SVM prediction model and the actual output of the sensor, the real-time detection of the sensor faults can be achieved. Based on the residual sequence, the on-line identification of sensor bias fault and drift fault can be achieved as well. A model of sensor faults is established by the toolbox of matlab simulink in this paper, the simulation results show that the approach proposed can not only improve the accuracy and time efficiency of fault diagnosis, but also identify the type, size and the time of sensor faults occurred accurately. © 2011 IEEE.

关键词： Failure analysis

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Multirate Multisensor Data Fusion Algorithm for State Estimation with Cross-Correlated Noises

Multirate Multisensor Data Fusion Algorithm for State Estima...

引用

7th International Conference on intelligent systems and Knowledge Engineering, ISKE 2012

作者： Liu, Yulei Yan, Liping Xiao, Bo Xia, Yuanqing Fu, Mengyin Key Laboratory of Intelligent Control and Decision of Complex Systems School of Automation Beijing Institute of Technology 100081 Beijing China

This paper is concerned with the optimal state estimation problem under linear dynamic systems when the sampling rates of different sensors are different. The noises of different sensors are cross-correlated and coupled with the system noise of the previous step. By use of the projection theory and induction hypothesis repeatedly, a sequential fusion estimation algorithm is derived. The algorithm is proven to be optimal in the sense of Linear Minimum Mean Square Error(LMMSE). Finally, a numerical example is presented to illustrate the effectiveness of the proposed algorithm. © Springer-Verlag Berlin Heidelberg 2014.

关键词： State estimation

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Spatially Dense Multi-Target Track Segment Association Algorithm 42

Spatially Dense Multi-Target Track Segment Association Algor...

引用

42nd Chinese control Conference, CCC 2023

作者： Yao, Yan Yan, Liping Xia, Yuanqing School of Automation Beijing Institute of Technology Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing100081 China

ISBN: (纸本)9789887581543

In the field of radar data processing, track interruption seriously affects target tracking, track fusion, and other tasks. The existing track segment association algorithms have low correlation accuracy in dense distributed or long-time interruption situations. To this purpose, a dense multi-target track segment association (DMTTSA) algorithm is proposed. Firstly, two identical networks based on the multi-head probability sparse (ProbSparse) self-attention are used to capture the long-term dependencies of the tracks. Then, the bidirectional quadruplet hard sample loss (BiQuaHard loss) is constructed to make the tracks belonging to the same targets closer and the tracks belonging to the different targets farther. Finally, DMTTSA takes the closest track pairs in the feature space as the associated tracks and divides the unassociated tracks into the birth and dead tracks in chronological order. Some comparative experiments are carried out to show the anti-noise performance of the DMTTSA, as well as the effectiveness of solving the problem of dense multi-target track interruption. © 2023 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Target tracking

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Backstepping based adaptive sliding mode control for spacecraft attitude maneuvers

Backstepping based adaptive sliding mode control for spacecr...

引用

2012 UKACC International Conference on control, control 2012

作者： Cong, Binglong Liu, Xiangdong Chen, Zhen Key Laboratory for Intelligent Control and Decision of Complex Systems School of Automation Beijing Institute of Technology Beijing 100081 China

ISBN: (纸本)9781467315609

This paper aims to address the robust control problem of rigid spacecraft attitude maneuvers in the presence of inertia matrix uncertainty and external disturbance. A back-stepping based adaptive sliding mode control (B-ASMC) design is proposed as a solution, where the upper bounds of the parametric uncertainty and disturbance are not required in advance. Compared to current adaptive sliding mode control (ASMC) design, the B-ASMC design has two advantages. Theoretically, the asymptotical stability of the attitude states rather than the sliding function is guaranteed. Practically, the over-adaptation problem in current ASMC design is alleviated and the system performance is improved. Detailed design principle and rigorous closed-loop system stability analysis are provided. A large angle attitude maneuver is employed in the numerical simulation to verify the effectiveness of the proposed algorithm. © 2012 IEEE.

关键词： Backstepping

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3D multi-constraint route planning for UAV low-altitude penetration based on multi-agent genetic algorithm

3D multi-constraint route planning for UAV low-altitude pene...

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作者： Wu, Jin-Ping Peng, Zhi-Hong Chen, Jie School of Automation Beijing Institute of Technology Beijing 100081 China Key Laboratory of Complex System Intelligent Control and Decision Beijing Institute of Technology Ministry of Education China

ISBN: (纸本)9783902661937

Low-altitude penetration is one of the most important military applications of Unmanned Aerial Vehicles (UAVs). 3D route planning, which is a complex multi-objective optimization problem with multiple constraints, is the key technology of UAV low altitude-penetration. A 3D route planning method based on Multi-Agent Genetic Algorithm (MAGA) is proposed in this paper. Specifically, a dynamic route representation form is proposed to improve the flight route accuracy. An efficient constraint handling method is used to simplify the treatment of multi-constraint and reduce the time-cost of planning computation. More importantly, details are presented to show how to apply MAGA to 3D route planning while some necessary improvements of MAGA are proposed to make it more efficient. Simulation and analysis illustrate the effectiveness of this method. © 2011 IFAC.

关键词： Military applications

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Adaptive sliding mode control for spacecraft attitude maneuvers with reduced or eliminated reaching phase

Adaptive sliding mode control for spacecraft attitude maneuv...

引用

2012 UKACC International Conference on control, control 2012

作者： Cong, Binglong Liu, Xiangdong Chen, Zhen Key Laboratory for Intelligent Control and Decision of Complex Systems School of Automation Beijing Institute of Technology Beijing 100081 China

ISBN: (纸本)9781467315609

This paper aims to present an improved adaptive sliding mode control (ASMC) design for rigid spacecraft attitude maneuvers. An adaptive scheme is proposed for the switching gain calculation when the upper bound of the system uncertainty is unknown in advance. Unlike existing ASMC design, which may result in an over-adaptation of the upper bound when the initial system trajectory is located far from the sliding surface, this paper presents a novel ASMC strategy by introducing a decay term in the sliding function to reduce or eliminate the unrelated factor in the adaptation scheme. Consequently, a lower-chattering control signal is achieved. Simulation results are presented to illustrate the effectiveness of the proposed strategy. © 2012 IEEE.

关键词： Sliding mode control

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Real-time algorithm for SIFT based on distributed shared memory architecture with homogeneous multi-core DSP

Real-time algorithm for SIFT based on distributed shared mem...

引用

International Conference on intelligent control and Information Processing (ICICIP)

作者： Liu, Xin Chen, Wenjie Ma, Tao Xu, Lishuang School of Automation Beijing Institute of Technology Key Laboratory of Complex Systems Intelligent Control and Decision Beijing 100081 China

ISBN: (纸本)9781457708145

When Multi-DSP parallel architecture transfers to distributed memory way from shared memory way, its parallelism with fine-grained become weak, and it's difficult to offer SIFT's complex computing and satisfy the need of real-time. In the paper, a parallel algorithm, based on distributed shared memory architecture with homogeneous Multi-core DSP, referring to the DSM architecture model of parallel processing machines is presented. Firstly, the master processor separates the task into several small tasks by exploiting the coarse-grained parallelism inherent;then, through a high-speed network for data-exchange, each small task transfers to a related subsystem, based on a homogeneous multi-core DSP;finally, the DSP partitions the small task across multiple cores by exploiting the fined-grained parallelism. The experimental result shows that, comparing to the traditional way, the proposed algorithm increases the speedup, calculates 45 frames on 640480 images, and achieves the real-time application. © 2011 IEEE.

关键词： HIgh speed networks

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