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A Single-phase Rectifier with a Neutral Leg to Reduce DC-bus Voltage Ripples

A Single-phase Rectifier with a Neutral Leg to Reduce DC-bus...

引用

IEEE Energy Conversion Congress and Exposition

作者： Wen-Long Ming Qing-Chang Zhong Wanxing Sheng Dept. of Automatic Control and Systems Engineering The University of Sheffield United Kingdom Dept. of Power Distribution China Electric Power Research Institute Beijing 100192 China

ISBN: (纸本)9781479957774

The voltage ripples of the half-bridge rectifier lead to the requirement on bulky electrolytic capacitors and voltage difference on the split capacitors. In this paper, a topology for a single-phase rectifier is proposed to reduce the DC-bus voltage ripples and voltage difference without using electrolytic capacitors. The proposed rectifier contains two legs: 1) A rectification leg to maintain the DC-bus voltage and to draw a clean input current with unity power factor;2) A neutral leg to reduce DC-bus voltage ripples and the voltage difference. The two legs are independently controlled and the resulted high performance of the system is achieved. In order to test the system, real-time simulations were conducted and associated results are presented to demonstrate that the system is able to considerably reduce the DC-bus voltage ripples. With the derived system, the total required DC-bus capacitors can be reduced a lot when achieving the same level of voltage ripples.

关键词： Capacitors Voltage control Topology Integrated circuit modeling Legged locomotion Real-time systems

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MATLAB tools for the analysis of Petri net models

MATLAB tools for the analysis of Petri net models

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Jorge Júlvez Mihaela H. Matcovschi Octavian Pastravanu Dept. of Computer Science and Systems Engineering Univ. of Zaragoza Spain Dept. of Automatic Control and Applied Informatics Technical University “Gh. Asachi” of Iasi Romania

The paradigm of Petri nets offers a rich modeling power that has been successfully exploited in many different application domains as manufacturing, logistic, traffic, computer and biological domains. In order to develop and analyze Petri models in an efficient and systematic way, appropriate software tools are required. Among the existing software platforms for scientific software development, MATLAB places at the user's disposal a large set of toolboxes with an inutitive graphical interface. This paper describes some of the existing Petri net toolboxes that have been developed on MATLAB, and that cover the needs for the modeling and analysis of discrete, continuous and hybrid systems.

关键词： Computational modeling Semantics Servers Petri nets MATLAB Analytical models

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Modelling a moving land-sea boundary using adaptive mesh refinement 10

Modelling a moving land-sea boundary using adaptive mesh ref...

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10th Coasts, Marine Structures and Breakwaters Conference 2013: From Sea to Shore - Meeting the Challenges of the Sea

作者： Furuyama, Shoichi Maihara, Yusuke Dept. of Electronics and Information Engineering Toyama National College of Technology 1-2 Ebie-Neriya Imizu Toyama933-0293 Japan Toyama National College of Technology Advanced Course of Control Information System Engineering 1-2 Ebie-Neriya Imizu Toyama933-0293 Japan

ISBN: (纸本)9780727759771

High resolution calculation for the Tsunami run-up simulation at Toyama-bay in Japan is achieved by using Adaptive Mesh Refinement (AMR) method. The method is tested at Hamana-lake for the tide simulation, the water level rising simulation at Toyama-bay and Tsunami runs-up simulation at Toyama-bay. AMR generated the fine mesh at the boundary line between the water and the land. In the case of the tide simulation at Hamana-lake, the reasonably agreement result with the experimental data was given by using the AMR. In the case of water level rising simulation, the method kept the reasonably constant of the total number of calculation meshes by deleting the fine meshes at the far from the interested region, and the method was applied Tsunami run-up simulation at the Toyama-bay.

关键词： Water levels

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Identification of contact conditions between fingers and a grasped object by active force sensing

Identification of contact conditions between fingers and a g...

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： Takayoshi Yamada Shotaro Nakanishi Hidehiko Yamamoto Rolf Johansson Dept. of Mechanical Engineering Gifu University Gifu Japan Dept. of Human and Information Systems Gifu University Dept. of Mechanical Eng. Gifu University Dept. of Automatic Control eLLIIT Excellence Center at Lund University

ISBN: (纸本)9781479957378

In this paper, we discuss an identification of contact conditions by active force sensing. The contact conditions include not only contact location but also contact type and contact direction. The contact type is point, soft-finger, line or planar contact with friction. In our previous papers, the contact conditions between a grasped object and its external environment was treated. This paper identifies the contact conditions between fingers and a grasped object by using six-axis force sensors. Each finger has less than six degrees of freedom. Sensing strategies are provided. The experiment system is introduced and our proposed method is verified.

关键词： Shape Force Thumb Robot sensing systems Eigenvalues and eigenfunctions Force sensors

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Analysis in DSC-PLL grid synchronization method under grid frequency variation

Analysis in DSC-PLL grid synchronization method under grid f...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Jaedo Lee Hanju Cha Dept. of Instrument control & Electrical System Korea Institute of Nuclear Safety Daejeon Korea Dept. of Electrical Engineering Chungnam National University Daejeon Korea

ISBN: (纸本)9781479951635

In this paper, a new frequency adaptive DSC-PLL is proposed to improve the grid synchronization when the grid voltage is polluted by harmonics, unbalanced conditions and frequency deviated circumstances. A design method for the proposed PLL adaptive to input frequency variation is discussed, and the frequency adaptive DSC-PLL is evaluated by simulations to show their capability for detecting different harmonic components in a highly polluted grid conditions. Simulation results show the significant effects that mitigate harmonics, unbalance components and detect frequency error through the proposed PLL.

关键词： harmonics suppression phase locked loops synchronisation DSC-PLL grid synchronization method delayed signal cancellation frequency adaptive DSC-PLL frequency deviated circumstances grid frequency variation grid voltage unbalanced conditions DSC(Delayed Signal Cancellation) Frequency Locked Loop PLL(Phase Locked Loop)

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The use of genetic algorithms for speed and current controller designs for IPMSM drive

The use of genetic algorithms for speed and current controll...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Pakorn Chottiyanont Mongkol Konghirun Wanchak Lenwari Dept. of Electrical Engineering King Mongkut's University of Technology Thonburi Thailand Dept. of Control System and Instrumentation Engineering King Mongkut's University of Technology Thonburi Thailand

ISBN: (纸本)9781479951635

Recently, speed and current controller have been developed for interior permanent magnet synchronous motor (IPMSM). Each method has its own advantage and limitation. However, in the commercial drive system, the controller should be easy to set up and tune in particular for operator, therefore the classical proportional plus integral (PI) controller has widely used due to its simple structure while achieving zero steady-state error. However finding out the parameters of the controller is not any easy task because of complex dynamics of IPMSM. For this reason, this paper presents a novel automated design employed genetic algorithm (GA) to optimize PI speed and current controller of IPMSM. The drive control system is designed on the basis of vector control scheme incorporated with the maximum torque per ampere (MTPA) control strategy to improve the drive performance. Simulation and experimental results verify the effectiveness of the proposed method.

关键词： Torque Optimization Genetic algorithms Stators Mathematical model Simulation Sociology

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Design of an optimized sliding mode control for loaded double inverted pendulum with mismatched uncertainties

Design of an optimized sliding mode control for loaded doubl...

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International Conference on Methods and Models in Automation and Robotics (MMAR)

作者： Manar Lashin Ahmed Ramadan Hossam S. Abbass Ahmed Abo-Ismail Mechatronics and Robotics Eng. Dept. Egypt-Japan University of Science and Technology Egypt Computers and Automatic Control Dept. Tanta University Tanta Egypt Electrical Engineering Dept. Assuit University Assuit Egypt

In this paper, the stabilization problem of loaded double inverted pendulum using an optimized state feedback sliding mode control is investigated. ADAMS/Matlab co-simulation environment is used for building a virtual nonlinear model for loaded double inverted pendulum system and the state feedback sliding mode control law is designed for stabilizing the system. Mismatched uncertainties represented by payload variations is considered. Genetic Algorithms are used to optimize the parameters of the sliding mode controller based on a performance index containing the sum of squared errors. The proposed control scheme can significantly suppress chattering effect and improves the performance of the system against uncertainties. Simulation results show the effectiveness of the approach and the robustness of the system against payload changes.

关键词： Mathematical model Payloads Uncertainty MATLAB Robustness Optimization Vectors

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Sequential Monte Carlo for graphical models 14

Sequential Monte Carlo for graphical models

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Proceedings of the 27th International Conference on Neural Information Processing systems - Volume 2

作者： Christian A. Naesseth Fredrik Lindsten Thomas B. Schön Div. of Automatic Control Linköping University Linköping Sweden Dept. of Engineering The University of Cambridge Cambridge UK Dept. of Information Technology Uppsala University Uppsala Sweden

We propose a new framework for how to use sequential Monte Carlo (SMC) algorithms for inference in probabilistic graphical models (PGM). Via a sequential decomposition of the PGM we find a sequence of auxiliary distributions defined on a monotonically increasing sequence of probability spaces. By targeting these auxiliary distributions using SMC we are able to approximate the full joint distribution defined by the PGM. One of the key merits of the SMC sampler is that it provides an unbiased estimate of the partition function of the model. We also show how it can be used within a particle Markov chain Monte Carlo framework in order to construct high-dimensional block-sampling algorithms for general PGMs.

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A design of bilateral servo system with self-tuning function

A design of bilateral servo system with self-tuning function

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International Conference on Advanced Mechatronic systems (ICAMechS)

作者： Hirofumi Ohtsuka Tomoaki Nakamura Dept. of Control and Information System Engineering Kumamoto National College of Technology Kumamoto Japan Kumamoto National College of Technology Advanced Course of Electronics and Information System Engineering Kumamoto Japan

Manual micromanipulation requires for operators to have enough experience and outstanding skill. A bilateral servo system attempts to convert difficult tasks so as to be felt easier for skilled operators. One of such a bilateral servo system, which reduces the displacement and expands the force, has been proposed by Kikuchi and Shiraishi[1]. However, concerning to the offset between a master manipulator's stiffness and a slave manipulator's one, its adverse effects of the operation stability becomes remarkable for the change of operator's dynamics. In an actual use, such offset may cause a heavy damage of the manipulated object by the operation. In this study, we propose a self-tuning mechanism which can eliminate such offset problem. And we have confirmed the effectiveness of the proposed method by numerical simulation.

关键词： Manipulators Force Numerical simulation Servomotors Steady-state

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ESC-MRAC of MIMO systems for constrained robotic motion tasks in deformable environments

ESC-MRAC of MIMO systems for constrained robotic motion task...

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European control Conference (ECC)

作者： Vasiliki Koropouli Azwirman Gusrialdi Dongheui Lee Institute of Automatic Control Engineering Technische Universität München München Germany Dept. of Electrical Engineering and Computer Science University of Central Florida USA

ISBN: (纸本)9781479947287

Performance of constrained movements in multiple directions of a workspace simultaneously and in presence of uncertainty is a great challenge for robots. Achieving such tasks by employing control policies which are fully determined a priori and do not take into account the system uncertainty can cause undesired stress on the robot end-effector or the environment and result in poor performance. Instead, a sophisticated control policy is required, which can adjust to the varying conditions of a task while taking into account the coupling of motion dynamics between different directions of movement. To this aim, in this paper, we propose a MIMO Extremum Seeking control (ESC)-Model Reference Adaptive control (MRAC) approach with the view of executing fine motion tasks in presence of uncertain task dynamics. ESC enhances robustness of the system to non-parametric uncertainties compared to single MRAC. The proposed approach ensures state tracking as well as optimization of a global state-dependent cost criterion in all directions of movement. We evaluate our approach in simulations and in a real-world robotic engraving task.

关键词： MIMO Tracking Dynamics Vectors Uncertainty Adaptation models Robots

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