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IEEE/PES Transmission and Distribution Conference and Exposition Latin America

作者： Shayani, R. A. Oliveira, M. A. G. Johnson Control's Building Automation System Brazil Department of Electrical Engineering IEEE Brazil Council Brazil

ISBN: (纸本)9781424402878

The panel efficiency of a stand-alone photovoltaic system is usually used to define the performance of the entire system. The typical efficiency value for silicon modules is about 15%. The performance of all components is a number hard to be known. This paper aims to determine the fully efficiency of the entire PV system, calculating the electrical energy from the frequency inverter output and the total solar energy from the Sun. The relationship between the array and the lead-acid battery dimensioning is shown;the best practices try to reduce the premature capacity loss of the battery, but it also reduces the global performance of the system. An experimental procedure measured the real efficiency of an entire system, that is about 50% of the solar radiation available over the solar modules, which is different from the 84% rate available from the bibliography.

关键词： photovoltaic power systems solar energy solar power generation solar radiation

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Investigation of transient performance of Capacitor Voltage Transformer

Investigation of transient performance of Capacitor Voltage ...

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1st International Power and Energy Conference (PECon 2006)

作者： Bakar, Ab. Halim Abdul Lim, Cheng Hock Mekhilef, Saad Protection Department Transmission Division TNB Electrical Energy and Power System Universiti Malaya Malaysia Department of Electrical Engineering University of Malaya Center for Research Power Electronics and Drives Automation and Control

ISBN: (纸本)9781424402731

This paper reports the digital-time domain and frequency domain studies on a typical 132kV Capacitor Voltage Transformer (CVT) model. The transient studies are conducted using Alternative Transient Program (ATP-EMTP). Simulation results corresponding to the CVT transient response under both system fault and ferroresonance condition are reported in this paper. Transient studies are performed (1) to identify the CVT components that contribute to the transient response of CVT, (2) to determine system condition that affect the CVT transient response. A lightning simulation case study is also presented.

关键词： CVT ferroresonance ATP-EMTP

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Fault Feature Extraction by Using Adaptive Chirplet Transform

Fault Feature Extraction by Using Adaptive Chirplet Transfor...

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World Congress on Intelligent control and automation (WCICA)

作者： Qianjin Guo Haibin Yu Jingtao Hu Department of Control Engineering and Communication System Graduate School of Chinese Academy of Sciences Beijing China Department of Control Engineering and Communication System Shenyang Institute of Automation Chinese Academy of Sciences Liaoning China

The vibration generated by industrial machines always contains nonlinear and nonstationary signals. It is expected that a desired time-frequency analysis method should have good computation efficiency, and have good resolution in both time domain and frequency domain. In this paper, the adaptive Gaussian chirplet distribution for an integrated time-frequency signature extraction of the machine vibration is presented. The adaptive Gaussian chirplet spectrogram is nonnegative, has a high time-frequency resolution, and is free of cross term interference, so it offers the advantage of good localization of the vibration signal energy in the time-frequency domain. Experimental results show that the proposed method is very effective

关键词： Feature extraction Chirp Time frequency analysis Signal resolution Signal generators Time domain analysis Frequency domain analysis Spectrogram Energy resolution Interference

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Transient Fault Signal Detection Using Wigner Higher-Order Moment Spectra Methods

Transient Fault Signal Detection Using Wigner Higher-Order M...

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IEEE International Conference on Mechatronics and automation

作者： Qianjin Guo Haibin Yu Jingtao Hu Aidong Xu Department of Control Engineering and Communication System Graduate School of Chinese Academy of Sciences Beijing China Department of Control Engineering and Communication System Shenyang Institute of Automation Chinese Academy of Sciences Liaoning China

Most mechanical faults in machinery reveal themselves through transient events in vibration signals. That is, the vibration generated by industrial machines always contains nonlinear and non-stationary signals. Many analysis methods in current use are optimal for Gaussian and linear models but are suboptimal when the problem is one of analysing non-stationary, non-linear and non-Gaussian signals. Focusing on the defects of different joint time-frequency representations, the analysis of transient vibration signals is considered using Wigner higher-order based time-frequency distributions in this paper. The Wigner higher-order moment spectra (WHOS), which are the extensions of the Wigner-Ville distribution (WVD) to higher-order moment spectra domains, can describe the higher-order moment spectral characteristics from the time domain and the frequency domain simultaneously. The simulation case show that this technique has high time-frequency resolution and reduced interference terms

关键词： Signal detection Vibrations Transient analysis Signal resolution Signal analysis Frequency domain analysis automation control engineering Machinery Signal generators

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Selective Harmonic Elimination in Multi-Modules Three-Phase Current-Source Converters

Selective Harmonic Elimination in Multi-Modules Three-Phase ...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Johan I. Guzman Jose R. Espinoza Navid R. Zargari Luis A. Moran Department of Electrical Engineering Concepcion University Concepcion Chile Rockwell Automation Canada Control System Cambridge ONT Canada

Modular current source converters (MCSC) can enhance the current capacity and improve the power quality at medium voltage PWM motor drives. A MCSC uses individual three-phase modules in a shunt connection to share the total power in a symmetrical manner. The modulation of these units is normally done using optimized patterns as selective harmonic elimination (SHE). However, the optimization is usually performed at each module. This paper proposes a modulating technique that optimizes the operation of a MCSC built up of P modules. Thus, for the same switching frequency, P times the number of harmonics are removed from the injected ac current as compared to the regular approach. A complete mathematical formulation as well as experimental results validate the theoretical considerations

关键词： Pulse width modulation Pulse width modulation converters Medium voltage Topology Switching frequency Power harmonic filters Power semiconductor switches Pulse width modulation inverters Space vector pulse width modulation Power system harmonics

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Measured disturbance estimation for model predictive controller

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Mediterranean Journal of Measurement and control 2006年第3期2卷 144-151页

作者： Kulcsar, Balazs Bokor, J. Department of Transport Automation Faculty of Transportation Engineering Budapest University of Technology and Economics Budapest Hungary System and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary

This paper presents the Model Predictive controller design process when an unknown input observer provides measured disturbance form unmeasured one. Instead of using an unmeasured disturbance dynamic implemented into the controller, the joint observer-controller uses the estimated measured exogenous disturbance signal. Furthermore the observer can send an alarm sign to the supervisor. The detection and isolation of the unmeasured disturbance is computed by the geometric based strategy called Fundamental Problem in Residual Generation. Better the estimation of the disturbance is, better the rejection of the controller. The measured disturbance could be anticipated. A numerical example explains the effectiveness of the estimation and the usage of the unmeasured disturbance detection. Copyright © 2006 SoftMotor Ltd.

关键词： Predictive control systems

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Modeling Issues in Three-Phase Current Source Rectifiers that use Damping Resistors

Modeling Issues in Three-Phase Current Source Rectifiers tha...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Pedro E. Melin Jose R. Espinoza Navid R. Zargari Miguel A. Sanchez Johan I. Guzman Department of Electrical Engineering Concepcion University Concepcion Chile Rockwell Automation Canada Control System Cambridge ONT Canada

The model of a three-phase current source rectifier (CSR) is a complex mathematical representation as it is nonlinear, multi-variable, and coupled. In order to work with a simplified but still accurate model, a representation in a rotating reference frame dq0 in combination with an average model are normally used. The result is a model that operates with ripple free inputs, outputs, and state variables that should be the accurate average value of the actual variables. However, the average model of these topologies could lead to errors if damping resistors are used. A case study shows as much as 10% error in the DC link current between the actual value and the predicted by the average model. This paper finds and shows systematically the source of the error and proposes a method for the accurate average modeling of CSRs with damping resistors. Simulated results show the validity of the theoretical considerations

关键词： Rectifiers Damping Resistors Mathematical model Power harmonic filters Power system modeling Voltage Topology Pulse width modulation Resonant frequency

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Generalized contact force estimator for a robot manipulator

Generalized contact force estimator for a robot manipulator

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IEEE International Conference on Robotics and automation (ICRA)

作者： J.G. Garcia A. Robertsson J. Gomez Ortega R. Johansson System Engineering and Automation Department Jaen University Jaen Spain Department of Automatic Control Lund University Lund Sweden

In this work, we present implementation and experiment of the theory of dynamic force sensing for robotic manipulators. In the robot manipulation context, end-effector contact forces may be difficult to measure due to tool interference, yet indirect measurement such as from wrist-mounted force sensors provide force measurement contaminated by inertial forces of the tool distal to the force sensor. In order to extract the contact force exerted by the robot, it is necessary to separate the contact forces from inertial forces. We propose a complete formulation and implementation of a new control strategy based on multi-sensor fusion with three different sensors - that is, encoders mounted at each joint of the robot with six degrees of freedom, a wrist force sensor and accelerometers - whose goal is to obtain a suitable contact force estimator. These new observers contribute to overcome many of the difficulties of uncertain world models and unknown environments, which limit the domain of application of contemporary robots used without external sensory feedback; in addition, the final observer can be applied to any kind of real robot system. An impedance control scheme was proposed to verify the improvement. The experiments were carried out on an industrial Staubli RX60 manipulator with open control system architecture

关键词： Force sensors Robot sensing systems Manipulator dynamics Force measurement Pollution measurement Service robots Interference Force control Sensor fusion Wrist

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Power Losses for IGCTs and Diodes in MV Three-level Inverters

Power Losses for IGCTs and Diodes in MV Three-level Inverter...

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International Conference on Power Electronics and Drive systems (PEDS)

作者： Yuan Liqiang Zhao Zhengming Yang Zhi Department of Electrical Engineering State Key Lab of Control and Simulation of Power System Tsinghua University Beijing China Department of Frequency-converter and Control System GuoDian NanJing Automation Company Limited Nanjing China

The power-loss models for different switching states of IGCTs and diodes in MV (medium voltage) three-level NPC (neutral point clamped) inverters are presented in this paper. The models, simulation implementation and the revisional experiments on IGCT test platform are described in details. The relation between the power losses and the other elements of the inverter is analyzed and discussed.

关键词： Diodes Switches Pulse width modulation inverters Power system modeling Medium voltage Variable speed drives Circuits Cooling Pulse width modulation Snubbers

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control of Five-qubit system Based on Quantum Reinforcement Learning

Control of Five-qubit System Based on Quantum Reinforcement ...

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International Conference on Computational Intelligence and Security

作者： Daoyi Dong Chunlin Chen Zonghai Chen Chenbin Zhang Department of Automation University of Science and Technology Hefei Anhui China Key Laboratory of Systems and Control Chinese Academy and Sciences Beijing China Department of control and system engineering School of Management and Engineering Nanjing University Nanjing China

ISBN: (纸本)1424406048

controlling the multi-qubit system is a key task for practical quantum information processing. In this paper, the control problem of five-qubit is studied. A novel quantum reinforcement learning algorithm based on quantum superposition principle is proposed for the quantum control problem. The simulated result shows that quantum reinforcement learning can effectively find the optimal control sequence through fast learning

关键词： control systems Learning Quantum mechanics Automatic control automation Optimal control Quantum computing Nuclear magnetic resonance Information processing Information theory

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