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Investigation of transient performance of Capacitor Voltage Transformer

Investigation of transient performance of Capacitor Voltage ...

引用

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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Global performance measurement of a stand-alone photovoltaic system

Global performance measurement of a stand-alone photovoltaic...

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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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High frequency reversible rectifier based energy extraction of dynamic voltage restorer

High frequency reversible rectifier based energy extraction ...

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7th IET International Conference on Advances in Power system control, Operation and Management, APSCOM 2006

作者： Yin, Zhongdong Shu, Qing Huang, Yuanyan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Department of Electric Engineering North China Electric Power University Beijing China

ISBN: (纸本)0863412467

Energy extraction and control of dynamic voltage restorer (DVR) have been warmly discussed. This paper presents and studies high frequency reversible rectifier based energy extraction of DVR. Researches three operating modes of rectifier and its control under system balance, single phase voltage sag, regeneration three conditions based on simulation. Results verified the correction and validity of presented control strategy and algorithm.

关键词： Electric rectifiers

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The structure and application of flexible SCADA

The structure and application of flexible SCADA

引用

2006 IEEE Power engineering Society General Meeting, PES

作者： Haijing, Yang Yihan, Yang Dongying, Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Department of Electrical Engineering North China Electric Power University Zhuxinzhuang Dewai Beijing 102206 China

ISBN: (纸本)1424404932

This paper put forward to an interactive flexible SCADA system in which information shared, on the basis of analyzing and summarizing the defections of former SCADA. It not only solves the interaction of data and function in the information islands, but also solves functions coordination and data exchange of distributed application system in different location. The paper proposes the concept of general data acquisition, discusses the structure and the ways of technology support, and describes the application of flexible SCADA based on the example of fault decision support system (FDSS). This proposal flexible SCADA extends and develops the data source of traditional SCADA and enriches the data foundation for power system advanced analysis software. ©2006 IEEE.

关键词： SCADA systems

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An intelligent distribution network planning based on GIS

An intelligent distribution network planning based on GIS

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2006 China International Conference on Electricity Distribution, CICED 2006

作者： Liu, Jun Yu, Han Zhang, Jianhua Yuan, Qihong Qian, Qi Shang, Jingfu Li, Sheng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing 102206 China Department: Electric Power Engineering North China Electric Power University 102206 China

ISBN: (纸本)0863416381

Distribution network planning is a multi-goal and multi-restricted problem that involves the geographical condition of power line route, constructing and maintenance expenses, power line losses, power flow and security constraint. Computer aided planning is an important studying direction now. However, automatic line routing can not be made now. A model is advanced in this paper to minimize the work of planner and to simplify the network planning procedure. In this paper, an improved particle swarm optimization (PSO) is used to escape the locally point by adopting the probability distribution feature and controlling the flying speed automatically. By using this method in Jinan power network, found that the speed of network-planning can be improved by adopting the improved PSO and geographical feature pretreatment.

关键词： Geographic information systems

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

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

引用

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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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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