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Power and Energy Engineering Conference (APPEEC), 2012 Asia-Pacific

Date 27-29 March 2012

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Displaying Results 1 - 25 of 876
  • [Cover art]

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  • [Copyright notice]

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  • Welcome

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  • Committees

    Page(s): 5 - 6
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  • 135 MW Boiler Lean Coal Burning with Lignite Transformation Technology Research

    Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (253 KB) |  | HTML iconHTML  

    In recent years, as coal prices rise, especially the poor coal prices remain high, and has been in short supply in the state, resulting in increasingly high cost of power generation and operating profit has been declining. This study used the ways of high-temperature heating furnace smoke plus cold wind sent pink to improve the dry milling system and explosion capabilities. View full abstract»

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  • 3P-Bridge Cascaded PWM Rectifier Suitable for HV Side of PET

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (268 KB) |  | HTML iconHTML  

    A novel topology of three-phase-bridge (3P-bridge) cascaded PWM rectifier was proposed and analyzed in this paper. The two-level cascaded 3P-bridge topology is composed of three basic cells and the basic cell is a three-phase voltage source PWM converter; the line voltages in AC side of the converter are produced through cascaded way. The analysis results showed that the proposed converter in this paper could be used for three-phase system of high-voltage and high-power directly, such as power electronic transformer (PET); its control method is simple and flexible. The simulation results demonstrated the correctness of the proposed converter and verified the theoretical predictions, with the One-cycle control (OCC) under vector operation mode. View full abstract»

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  • A 200-W Grid-Connected Single Phase Micro- Photovoltaic Inverter and Its Control Strategy

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (471 KB) |  | HTML iconHTML  

    This paper presents a 200-W single phase micro- photovoltaic (micro-PV) inverter and its control strategy for grid-connected operation. The micro-PV inverter was integrated to each PV panel, accomplishing dc-dc boost and dc-ac inversion individually. Thus the overall system reliability and MPPT efficiency can be improved significantly. The circuit principle for the proposed inverter is firstly investigated in this paper. Then its grid- connected control strategy is carried out in details. The controller consists of grid current regulation of high voltage side and the maximum power point tracking (MPPT) of low voltage side. The feasibility and effectiveness of the proposed circuit and control strategy have been demonstrated through simulation based on MATLAB/Simulink. The results provide theoretical validation and show a high potential of the proposed micro-PV inverter for practical implementation. View full abstract»

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  • A Black-Start Field Test in Shandong Power Grid of China

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (226 KB) |  | HTML iconHTML  

    This paper discusses a black-start field test performed with new strategy. The new strategy makes full use of the long time operation capability of pumped storage units in ultra-low load conditions and takes advantage of the double-bar configuration of most electrical stations, with black-start units only supplying the auxiliary load of itself and that of target units, enables a complete separation of restoration path from distribution and the other transmission networks, avoiding any disturbance to customers during restoration field test. This feature improves the reliability of restoration plans, makes field test process repeatable and predictable. Field test of Shandong power grid in China verified the feasibility of this new strategy and the possibility of applying it in other areas which use pumped storage units as cranking power. View full abstract»

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  • A Centralized Injection Method for Islanding Detection in Micro-Grids

    Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (245 KB) |  | HTML iconHTML  

    A desired islanding detection method applied in microgrid not only can detect islanding correctly within acceptable duration as same as that in distributed generation system, but also ensures the smooth transition from grid-connected mode to islanded mode. In the paper an islanding detection method is presented, which considers the characteristics of system equivalent impedance that varies with the microgrid connecting main grid or not, with the help of the negative current injection into the point of common coupling (PCC), and then identifies the negative voltage variations near PCC. The method is able to avoid the negative impact on the operation stability of the microgrid. Through the Matlab/Simulink simulation, the rapidity and affectivity of these principles are verified. View full abstract»

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  • A CFD-Based Analysis on Trends of Heat Exchanger Fouling

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1085 KB) |  | HTML iconHTML  

    With the use of finite volume method, this study focuses on the two-equation K-Epsil turbulence model with enhanced wall treatment and with water as its working medium. The fluid domain is discretized in the mode of second order discretization. A 20cm- diameter 1m-long heat exchanger is taken for an example. The velocity distribution on four 3mm- thick baffles with 35% baffle cut is studied. Heat exchange tubes are 8mm in diameter and are arranged in a square pattern. Heat exchange and flow are studied for the 96 tubes with an interval of 16mm. Through particle tracking and slice contours in the model, the trajectory of the fluid in the fluid domain of the shell and the flow, heat exchange, and pressure loss of fluid elements in all phases are studied. With their rates of change, a qualitative analysis can be made on the trends of fouling of shell-side fluid flow at all locations and provide theoretic support for further improvement of shell structure design of heat exchangers. View full abstract»

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  • A Chance-Constrained Programming Based Renewable Resources Included Generation Expansion Planning Method and Its Application

    Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (323 KB) |  | HTML iconHTML  

    Traditional generation expansion planning is based on the principle of certainty and not suitable for renewable energy resources (RES) included planning. The paper proposed a chance-constrained programming model to deal with the uncertainty caused by RES, and a simulation-base PSO algorithm is adopted to solve the model. The model and algorithm is used in an actual case which lie in the west of China, and the results show the effectiveness of the model and algorithm. View full abstract»

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  • A Combination Approach for Transient Power Quality Disturbance Recognition

    Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (345 KB) |  | HTML iconHTML  

    A combination approach of wavelet transformation and neural network is applied to realize transient power quality disturbance signals' recognition. Firstly, the mathematical models of five kinds of transient disturbance signals, such as voltage surging, voltage sag, voltage interruption, transient pulse and transient oscillation are founded. Then, using time-frequency characteristic of wavelet, the sample signal's feature vectors are extracted. At last these feature vectors are input into BP neural network. Using self-learning ability, the disturbance signals can be classified and recognized. The examples show that the method has a higher discrimination. It's effective to resolve transient power quality problem. View full abstract»

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  • A Combination Short-Term Load Forecasting Based on Decision-Making

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (349 KB) |  | HTML iconHTML  

    Firstly choosing five forecasting model that respectively giving a virtual load forecasting for the same case, then using the decision theory to sift models through odds matrix method, abandon the unsatisfactory models. Finally determine weightings according to each period of time minimum quadratic sum of residual error as objective function. Using the selected models for combination short-term load forecasting and comparing the result with the single model load forecasting results. It testified decision-making was referable and practical, the fitting accuracy of combination load forecasting was better than single one's. View full abstract»

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  • A Comparative Study of Magnetic Fields in 115 kV Single Circuit Transmission Line of Thailand

    Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1631 KB) |  | HTML iconHTML  

    This paper presents the analysis of magnetic field effects on 115 kV single circuit transmission line at the ground and around conductors by considering two study cases i) single circuit with single conductor ii) single circuit with bundled conductor. The magnetic field simulation concerned only 24-hour load currents supplying during weekends. This paper focused on a comparative study between two study cases and compared the results obtained during. The simulation results showed that the value of magnetic fields at the ground and around conductors of single circuit with single conductor case were less than those of the bundled conductor. View full abstract»

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  • A Comparison of Converter's Power Loss under Different PWM Methods

    Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (289 KB) |  | HTML iconHTML  

    This paper studies an fast calculating method of IGBT, then introduces several different PWM techniques in converters. It further compared the MVA rated three-phase IGBT converter's loss rates under different PWM means. Based on the lowest power loss, it presents the most desirable PWM method. View full abstract»

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  • A Comprehensive Assessment on the Online Monitoring Condition for Transformer Based on the Extension Theory

    Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (286 KB) |  | HTML iconHTML  

    The effective assessment on the operation condition of power transformer is an important means to conduct the condition maintenance for transformer and to improve the reliability of power system. Based on the amount of information of all kinds of online monitoring conditions obtained from the transformer intelligent components, the assessment model for comprehensive condition of transformer is established in this study through the introduction of extension theory. First, with respect to the disadvantage that there is considerable subjectivity in constructing judgment matrix by the traditional analytic hierarchy process (AHP), a new method is adopted to construct the judgment matrix. The orthogonal experimental design method, finite element simulation as well as AHP are adopted to determine the weighting of condition information index with scientific and objective attitude; next, the framework for comprehensive assessment of transformer condition is established with the extension-based comprehensive assessment method to achieve the qualitative and quantitative assessment on the transformer condition. The method is proved to be correct and valid through analysis of examples. View full abstract»

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  • A Design of Motor Condition Monitoring System for Flywheel Energy Storage

    Page(s): 1 - 4
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    This paper at first introduced the future of flywheel energy storage; second, analyzed the design of motor condition monitoring system for flywheel energy storage, and designed the motor condition monitoring system based on the design requirement of system. The results prove that this system can fulfill the design request. View full abstract»

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  • A Discussion of SiC Prospects in Next Electrical Grid

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (591 KB) |  | HTML iconHTML  

    Currently, silicon carbide (SiC) technology is developing rapidly. Compared to conventional silicon devices, it has high voltage, high temperature, fast switching speed and low on-resistance and other excellent features. Thus it will play an invaluable role in the next electrical grid. This paper describes the basic characteristics and development of SiC devices. Combined with the future requirements of the grid, it also presents several typical applications of SiC devices in future, such as HVDC, VSC-HVDC, DC grid power technology, solid state power electronics technology. View full abstract»

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  • A Fast Full-Line Tripping Distance Protection Method for HVDC Transmission Line

    Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (260 KB) |  | HTML iconHTML  

    Though distance protection has been successfully used for AC transmission line, there is no practical application of it for HVDC transmission line. For distance protection, it is essential to measure accurately at the zone boundary to distinguish internal fault from external correctly, and high measurement accuracy at any part of the full line is unnecessary. Besides, HVDC transmission line is generally connected with smoothing reactor at two ends and it can be regarded as the operating boundary of distance protection. Considering these features, a fast full-line tripping distance protection method for HVDC transmission line is introduced in this paper. Based on distributed parameter model, the voltage and current at the end-point are calculated accurately using those at the relay point. After that, the line between the end-point and fault point is simplified as lumped parameter RL model and the fault distance is obtained with differential equations. In this way, high calculation accuracy at the zone boundary is attained and which contributes greatly to the improvement of protection performance. Simulation results show that this method is capable of protecting the whole line with high rapidity, and can be used as primary protection for HVDC transmission. View full abstract»

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  • A Fault Locating Algorithm for the Resonant Grounding System Based on the Parameter Identification under Charge Transient

    Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (337 KB) |  | HTML iconHTML  

    Aim at the problem of single-phase ground fault for resonant grounding system (that is, arc-suppression coil grounded distribution network), a fault location algorithm based on parameter identification in the charging transient is proposed in this paper. The method uses charge transient electrical quantity generated at the moment of a single-phase ground fault occurs to identify line parameters, and takes the fault location considering that the total inductance between the bus and the fault is proportional to the distance. In a 35kV model of resonant grounding system, the efficiency is verified by simulation, with different fault distance, different fault time. View full abstract»

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  • A Functional Analytic Approach to the Power Series Solutions of an Nonlinear Differential Equations

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (107 KB) |  | HTML iconHTML  

    A functional analytic method was developed by E.K.Ifantis in 1987 to prove that certain non-linear ordinary differential equation (ODEs) have a unique power series solution which converges absolutely in a specified disc of the complex plane. In this thesis, we extended this method to certain systems of two non-linear ordinary differential equations.We then applied the result to an nonlinear differential system and obtained the power series solutions. View full abstract»

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  • A Functional Model of Thyristor Based on MATLAB for High Power Circuit Simulation

    Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (320 KB) |  | HTML iconHTML  

    A novel functional subcircuit model based on MATLAB/Simulink for high power circuit simulation is proposed in this paper. The model can overcome the limitation of PSPICE model in high power system and remedy the deficiency in transient analysis of the Simulink model in toolbox. It described the static and dynamic process of thyristor correctly in the simulation of a high power thyristor controlled reactor (TCR) system. A good practicality of the proposed model has been observed. View full abstract»

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  • A Fuzzy Self-Tuning Speed Control System of Diesel Generator

    Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB) |  | HTML iconHTML  

    For reducing the fuel consumption and improving the quality of power supplied by diesel generator, a digital electronic speed control system was designed in this paper. In order to adapt the broad load characteristics of rated operating range, the structure of Variable-Speed-Integrated-Generator (VSIG) was adopted, and two operating modes of speed governor were designed. For improving the performance of speed control, the speed governor of the system employed a fuzzy self-tuning proportion-integral-derivative structure controller that can provide variable gain strategies to account for nonlinearities in the system. The results of test were obtained by a 3kW naturally aspirated diesel generator which was applied islanded load. The test results showed that the system designed had integrated functions of speed regulating and good qulity of power supply. View full abstract»

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  • A High-Precision Solar Photovoltaic Panels Tracking Controller

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (238 KB) |  | HTML iconHTML  

    In order to improve the photoelectric conversion efficiency of photovoltaic generation systems, commonly used the solar automatic tracking control system to maximize the system get more solar energy and Increase the conversion efficiency. A novel high-precision closed-loop angle control solar automatic tracking controller was designed and presented in this paper, which used intelligent fuzzy control algorithm, and used high-performance MCU as control core, to achieve precise track sun control. Then automatic efficiently track the sun to receive the maximum solar radiation and the highest photoelectric conversion efficiency. The experimental results are presented to confirm the feasibility and effectiveness of the designed controller. View full abstract»

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  • A Hybrid Intelligent Optimization Algorithm for Dynamic Economic Dispatch with Valve-Point Effects

    Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (225 KB) |  | HTML iconHTML  

    Dynamic economic dispatch (DED) problem with considering value-point effects is a non-smooth, non-convex, multi-dimensional continuous nonlinear optimization problem. In allusion to the characteristics of this optimization problem, a hybrid intelligent optimization algorithm integrating Halton sequences, improved shuffled frog leaping algorithm (ISFLA) and Sequential Quadratic Programming (SQP) is proposed in this paper. A ten-unit test system for a period of 24 hours is studied to validate the feasibility and effectiveness of the proposed method. Results obtained by the proposed method are compared with those obtained by other approaches in the literatures. The results demonstrate that the proposed method has good performance for solving DED problem with value-point effects in terms of solution quality and computation efficiency. View full abstract»

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