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9th International Conference on Modelling, Identification and Control (ICMIC)

作者： Liu Shungui Tan Bo Zhou Weicai Zhang Xin He Hongtai Shenzhen Power Supply Bur Co Ltd Power Technol Res Ctr Shenzhen 518048 Peoples R China Beijing GuowangFuda Sci & Technol Dev Co Ltd Beijing 100070 Peoples R China

ISBN: (纸本)9781509065738

A method for UAV landing precisely on ground wire of high voltage transmission line is proposed based-on virtual control points. It solves the problem of high complexity and low computational efficiency of traditional attitude estimation algorithm. Firstly, the iterative algorithm based on spatial collinearity error is used to improve the pose estimation velocity. Then, according to the idea of virtual control point in EPnP algorithm, the pose estimation accuracy of the iterative solution is improved without increasing the computational complexity. Finally, the performance of the algorithm is tested by simulation and unmanned aerial vehicle experiments. The results show that the algorithm not only maintains the pose estimation accuracy, but also can obtain the pose estimation speed better than the orthogonal iterative algorithm which has a broader application prospects.

关键词： Virtual control points Pose estimation iterative algorithm UAVs accurate landing-line

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A Domain Decomposition Charge Simulation Method for Calculation of Power-frequency Electric Field 3

A Domain Decomposition Charge Simulation Method for Calculat...

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3rd IEEE International Electrical and Energy Conference (CIEEC)

作者： Li, Yongming Wang, Xiaowan Zhou, Yue He, Shengyu Xu, Luwen Zou, Anxin Chongqing Univ State Key Lab Power Transmiss Equipment & Syst Se Chongqing 400044 Peoples R China State Grid Zhejiang Elect Power Training Ctr Hangzhou 3100015 Peoples R China State Grid Chongqing Elect Power Test & Res Inst Chongqing 401123 Peoples R China

ISBN: (纸本)9781728116754

The distribution of power frequency electric field caused by super-high level power transmission engineering is an important issue in evaluation of electromagnetic environment problem. The calculation of this field around power transmission facilities in complex environment using Charge Simulation Method (CSM) is sometimes out of action for the reason of not enough RAM. This paper put forward a domain decomposition CSM. This method divided the calculation region into several subdomains with some overlapped parts at the border first. Then CSM is applied to these subdomains respectively to get the distribution of simulation charges. The impact of the adjacent domain (boundary problem) is solved by using iterative method. Finally, the distribution of electric field in different domains can be calculated respectively with simulation charges obtained inside its own domain. This method is verified and it is applied to the analysis of power frequency electric field around 500kV transformers in 500kV substation. The results indicate that this method can speed up the calculation and decrease the requirement of RAM. This method provides an effective way to analyze the distribution of power frequency electric field with complex environment.

关键词： charge simulation method overlapping domain decomposition method iterative algorithm power frequency electric field transformer

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Performance improvement of Level-Crossing A/D converters

Performance improvement of Level-Crossing A/D converters

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IEEE International Conference on Telecommunications/IEEE Malaysia International Conference on Communications (ICT-MICC 2007)

作者： MalmirChegini, M. Marvasti, F. Sharif Univ Technol Dept Elect Engn Adv Commun Res Inst Tehran Iran

ISBN: (纸本)9781424410934

Level Crossing (LC) Analog-to-Digital converters have been suggested as an asynchronous alternative to conventional schemes. It is our intention to improve the performance of these LC converters. In this paper, we also suggest alternative adaptive and multi-level adaptive LC schemes and use an iterative method to drastically improve the performance of LC converters. The impressive improvement of these schemes make LC converters a potential competitor to other conventional AID converters such as Sigma Delta Modulators (SDM).

关键词： adaptive level-crossing asynchronous A/D iterative algorithm non-uniform sampling

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Multivariable PID Controller Synthesis of Discrete Linear Systems based on LMIs

Multivariable PID Controller Synthesis of Discrete Linear Sy...

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IEEE Conference on Control and Applications (CCA)

作者： Dehnert, Robert Tibken, Bernd Paradowski, Thomas Swiatlak, Robert Univ Wuppertal Fac Elect Informat & Media Engn D-42119 Wuppertal Germany

ISBN: (纸本)9781479977871

We investigate a new approach for multivariable PID controller synthesis for time-discrete linear systems. The design of multivariable PID controller is challenging because it is necessary to consider coupling effects. As yet, there is no simple general method to solve this problem. This paper should contribute to find a solution. For the presented method a extended state space representation of the time-discrete closed-loop is necessary. The Schur complement is used to reformulate the Lyapunov stability theorem. This yields a non-linear matrix inequality. The non-linear component in this Schur complement is linearized by the Neumann series. Thus, we have a linear matrix inequality (LMI). This LMI is used to build an iterative algorithm, which determines the PID control parameters. We evaluate this algorithm on two examples to illustrate the results.

关键词： Lyapunov methods MIMO systems closed loop systems control system synthesis discrete time systems iterative methods linear matrix inequalities linear systems linearisation techniques multivariable control systems stability state-space methods LMI Lyapunov stability theorem MIMO system Neumann series PID control parameters Schur complement nonlinear component linearization controller design coupling effects extended state space representation iterative algorithm multivariable PID controller synthesis nonlinear matrix inequality time-discrete closed-loop time-discrete linear systems algorithm design and analysis Control systems Couplings Eigenvalues and eigenfunctions Linear matrix inequalities MIMO Lyapunov methods linear matrix inequalities multiple input multiple output systems Linear system Multivariable control systems algorithm design and analysis linearization techniques State-space methods Proportional Integral Derivative Control iterative algorithms Interim Local Management Interface Closed loop systems discrete time systems control system synthesis Eigenfunctions

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Fast algorithm for Dilation and Erosion using Arbitrary Flat Structuring Element: Improvement of Urbach and Wilkinson's algorithm to GPU computing

Fast Algorithm for Dilation and Erosion using Arbitrary Flat...

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International Conference on Multimedia Computing and Systems (ICMCS)

作者： Moreaud, Maxime Itthirad, Frederic IFP Energies Nouvelles Dept Control Signal & Syst F-69360 Solaize France NT2I St Etienne France

ISBN: (纸本)9781479938247

Mathematical morphology is widely used in image processing. Since all morphological operations are based on evaluating values contained in a local neighborhood, calculations on large neighborhood are particularly computationally intensive. Fast implementations for morphological operations do exist but are mostly only adapted to structuring elements of a limited size and/or a specific shape. Therefore, difficulties appear when an arbitrary or complex shape like a circle of a large size is needed. Since dilation and erosion can be used for the representation of all morphological operations, an efficient implementation of those operators is fundamental. Thus, this paper presents a new efficient algorithm for these basic operators of mathematical morphology. It enables the use of any shape of flat structuring element for grayscale images up to 3 dimensions. Also, we have defined this method as an iterative algorithm so it can be used on any parallel architecture and in particular, for GPU (Graphic Processor Unit) computing.

关键词： grayscale mathematical morphology arbitrary structuring element erosion dilation iterative algorithm GPU computing

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Security-Constrained Nodal-Based Clearing of the European Day-Ahead Electricity Market Formulated as a MILP Model

Security-Constrained Nodal-Based Clearing of the European Da...

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PowerTech, 2015 IEEE Eindhoven

作者： Chatzigiannis, Dimitris I. Biskas, Pandelis N. Bakirtzis, Anastasios G. Aristotle Univ Thessaloniki Dept Elect & Comp Engn Power Syst Lab Thessaloniki 54124 Greece

ISBN: (纸本)9781479976959

In this paper a nodal-based approach is evaluated for the clearing of the pan-European day-ahead electricity market. In the proposed mathematical formulation, the widely used in European Power Exchanges (PXs) profile block orders are explicitly modeled, whereas the full set of inter-zonal and intrazonal normal and security (N-i) transmission constraints is incorporated. The proposed approach is evaluated using a realworld power system, the Balkan power system, and the economic and computational aspects of the proposed methodology are thoroughly discussed.

关键词： European electricity market block orders N-1 security criterion iterative algorithm

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A New iterative Coherent Subspace Method for Wideband Direction Finding

A New Iterative Coherent Subspace Method for Wideband Direct...

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IEEE International Radar Conference (RadarCon)

作者： Wang, Feng Cui, Xiaowei Lu, Mingquan Tsinghua Univ Dept Elect Engn Beijing 100084 Peoples R China

ISBN: (纸本)9781479982325

In this paper, a new wideband direction-of-arrival (DOA) estimation algorithm, which is an iterative coherent subspace method based on two-dimensional discrete Fourier transform (2D-DFT), is proposed. Two stages of focusing are accomplished in the algorithm. Firstly, a modified 2D-DFT, which has accomplished a preliminary focusing process, is exploited on the received data to achieve initial estimates that are more accurate than the results of beamforming methods. More importantly, in the first stage, the real array manifold is projected to a new virtual array manifold that is more suitable for subsequent focusing. Secondly, based on the transformed data, an iterative process in which each step works on the estimates available from previous iterations is applied to the transformed data to estimate the DOA. Because of the implementation of 2D-DFT, the proposed algorithm can achieve a higher resolution and a better convergence performance than conventional methods, especially when the incoming sources have irregular distributions in the frequency domain. Performance analysis and simulation results show that the proposed algorithm works properly and effectively.

关键词： wideband direction finding coherent signal subspace two-dimensional discrete Fourier transform iterative algorithm

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The Practical Replacement of a Bonus-Malus System

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ASTIN Bulletin 2001年第2期31卷 317-335页

作者： Walhin, J.F. Paris, J. Paris, J. Université Catholique de Louvain Belgium Secura Belgian Re Belgium Institut de Statistique B-1348 Louvain-la-Neuve Voie du Roman Pays 20 Belgium

In this paper we will show how to set up a practical bonus-malus system with a finite number of classes. We will use the actual claim amount and claims frequency distributions in order to predict the future observed claims frequency when the new bonus-malus system will be in use. The future observed claims frequency is used to set up an optimal bonus-malus system as well as the transient and stationary distributions of the drivers in the new bonus-malus system. When the number of classes as well as the transition rules of the new bonus-malus system have been adopted, the premium levels are obtained by minimizing a certain distance between the levels of the practical bonus-malus system and the corresponding optimal bonus-malus system. Some iterations are necessary in order to reach stabilization of the future observed claims frequency and the levels of the practical bonus-malus system. © 2001, International Actuarial Association. All rights reserved.

关键词： actual claims frequency distribution Hofmann Distribution hunger for bonus iterative algorithm non-parametric mixed Poisson fit observed claims frequency distribution Optimal bonus-malus system practical bonus-malus system

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Two-phase Flow Parameters Measurement and Gauss-Newton Image Reconstruction algorithm for Electrical Capacitance Tomography

Two-phase Flow Parameters Measurement and Gauss-Newton Image...

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International Conference on Industrial Mechatronics and Automation

作者： Chen Yu Zhang Jian Chen Deyun Northeastern Forestry Univ Informat & Comp Engn Inst Harbin Peoples R China Harbin Univ Sci & Technol Comp Inst Harbin Peoples R China

ISBN: (纸本)9781424438181

To solve the problem of two-phase flow measurement for electrode electrical capacitance tomography (ECT), on the basis of analyzing ECT system measurement principle, we constructed the mathematical model of two-phase flow distribution information according to double integral infinitesimal principle, and formed a set of 12-Electrode two-phase ECT system. And to speed up the slow convergence rate of ordinary iteration method, a Gauss-Newton algorithm is improved on the basis of analyzing mechanism of the algorithm, and the feasibility of using this algorithm for ECT problems is discussed. It shows that it is easy to meet the convergence condition and error of image reconstruction is small. Experimental results and simulation data indicate that the algorithm can provide high quality images and favorable stabilization compared with LBP, Landweber and conjugate gradient algorithms and this new algorithm presents a feasible and effective way to research on image reconstruction algorithm for Electrical Capacitance Tomography System.

关键词： electrical capacitance tomography image reconstruction iterative algorithm Gauss-Newton

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A Cooperative Power Control Scheme for Two-user Gaussian Interference Channel 88

A Cooperative Power Control Scheme for Two-user Gaussian Int...

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88th IEEE Vehicular Technology Conference (VTC-Fall)

作者： Zhang, Liyuan Ma, Meng Fei, Yongqiang Lei, Yiming Jiao, Bingli Peking Univ Sch Elect Engn & Comp Sci Beijing 100871 Peoples R China Huawei Technol Co Ltd Shenzhen Peoples R China

ISBN: (纸本)9781538663585

In this paper, a cooperative power control scheme is proposed for two-user Gaussian interference channel (GIC) to mitigate the interference and improve the sum-rate. In the proposed scheme, codewords are divided into several segments. By jointly adjusting the power of each segment for the two users, the proposed scheme achieves a balance between increasing the entropy of signal and decreasing the entropy of interference, and thus maximizes the sum-rate. To solve the sum-rate maximization problem, an iterative algorithm combining both simulated annealing and gradient descent methods is also proposed. Numerical results show that the proposed scheme not only achieves higher sum-rate, but also provides better user fairness compared with the traditional schemes.

关键词： Gaussian interference channel sum-rate maximization rate region cooperation power allocation iterative algorithm

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