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Electrical Power Conference, 2007. EPC 2007. IEEE Canada

Date 25-26 Oct. 2007

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Displaying Results 1 - 25 of 110
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  • A New Fault Ride-through Strategy for Doubly Fed Wind-Power Induction Generator

    Page(s): 1 - 7
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (7563 KB) |  | HTML iconHTML  

    Withstanding grid faults becomes an obligation for the bulk wind generation units connected to the transmission network and it is highly desired for distribution wind generators. In this paper, a proposed scheme is implemented for DFIG to keep it operating during transient grid faults. Challenges imposed on the generator configuration and the control during the fault and recovering periods are presented. A comprehensive time domain model for the DFIG with the decoupled dq controller is implemented using Matlab/Simulink software. Intensive simulation results are discussed to ensure the validity and feasibility of the proposed fault ride through technique. The scheme protects the DFIG components, fulfills the grid code requirements, and optimizes the hardware added to the generator. View full abstract»

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  • Variable Speed Wind Turbines Using Cage Rotor Induction Generators Connected to the Grid

    Page(s): 8 - 13
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    In this paper, the performance of variable speed wind turbine concept with cage rotor induction generator connected to the grid is investigated. Variable-speed wind turbine generator system has been modeled and simulated to study their steady state and dynamic behavior. A cage rotor induction machine of 11 kW rating with a vector controlled back-to-back PWM-VSI inverter on the stator side have been tested and the results compared with digital simulations. The cage rotor induction machine allows good speed range and it should be used in low-power variable-speed systems, replacing the classical direct grid connected fixed speed wind generator systems. Its capacity to deliver reactive power is remarkable. View full abstract»

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  • Dynamic Voltage Stabilization of Stand-Alone Wind Energy Schemes

    Page(s): 14 - 19
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    Voltage stability is one of the serious problems in stand- alone wind energy schemes utilizing the induction generator especially under wind excursion and load variation. This paper presents a novel low cost Modulated Power Filter Compensator FACTS based-MPFC for a stand-alone green energy renewable wind energy conversion systems using self-excited low cost squirrel-cage induction generator (SEIG) driven by a wind turbine and connected to balanced/unbalanced load utility systems. A novel control scheme based on a tri-loop dynamic error driven error scaled regulator is applied to ensure both source and load bus voltage stabilization and enhance the power quality. The MPFC-FACTS scheme is digitally simulated and satisfactory results were obtained showing the applicability of the novel FACTS Stabilization Power Filter for supplying power to different unbalanced loads such as isolated villages, heating, water pumping, ventilation and air conditioning. View full abstract»

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  • Supervisory Hybrid Control of a Micro Grid System

    Page(s): 20 - 24
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    This paper presents a systematic approach for the design and analysis of a supervisory hybrid control scheme for a micro grid system using hybrid control techniques. A generic micro grid configuration is assumed. The approach is elaborated with a specific micro grid configuration containing a self-excited induction machine based wind energy conversion system. By definition a micro grid operates in both grid-connected and in isolated modes. In each mode of operation there could be different combinations of the available energy sources in the system that are catering to the load demand. A hybrid control scheme which utilizes different control mechanisms for optimal control of a system under different operating conditions and in different operating states, presents an attractive paradigm for the control design of such a system. By partitioning a micro grid into different modules along suitable axis, the complexity of a Multiple Input Multiple Output (MIMO) control problem of the system can be significantly reduced. The control of the different modules of a micro grid system can then be tackled using the well established linear control theory which could then be combined using suitable transition, load and power management strategies to achieve optimal control of the micro grid system in all its desirable operating states. Supervisory hybrid control of a wind energy conversion and storage system is presented to illustrate the supervisory hybrid control design and analysis philosophy outlined in this paper. View full abstract»

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  • Reliability Based Analysis for Optimum Allocation of DG

    Page(s): 25 - 30
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (6618 KB) |  | HTML iconHTML  

    DGs are gaining more importance and they are expected to drastically change the whole distribution system practices. Distribution network will be no longer a passive termination of transmission network and the concept of active network has been recently introduced to indicate a new kind of distribution with DGs actively involved in system management and operation. One of the most important benefits of DGs is reliability improvement. Therefore, in this paper a new methodology, based on system segmentation concept is proposed in order to select the optimum size and location of DGs required to maximize the system reliability. Moreover, a software was developed with the capability of scanning the distribution system in order to divide it into several operational segments based on the utilized protection devices. The reliability of each individual segment as well as the system reliability was evaluated based on selective reliability indices. Nevertheless, more indices can be taken into consideration for the evaluation process. This concept is applied to a practical distribution system, and the results showed that there is a great relation between size and location of DG and reliability improvement. View full abstract»

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  • Network Security Management and Authentication of Actions for Smart Grids Operations

    Page(s): 31 - 36
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    Operations of electricity power systems have recently become more intricate due to development of microgrids, execution of open access competition, and use of network-controlled devices, etc. Computer network therefore turns into a key integral of modern power-grid operations. This paper proposes a new utility computer network security management and authentication for actions / commands requests in smart-grid operations. This management covers multiple security domains in a new security architecture designed for smart power grids. This paper presents the strategy and procedure of security checks and authentications of commands requests for operations in the host area electric power system (AEPS) and interconnected multiple neighboring AEPS. Case studies of the new security management and authentication for smart grids operations are presented. View full abstract»

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  • A Hybrid Photovoltaic PV Array-Battery Powered EV-PMDC Drive Scheme

    Page(s): 37 - 43
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5250 KB) |  | HTML iconHTML  

    In this study, a hybrid photovoltaic PV array-battery powered PMDC drive scheme is realized. The PID tri loop limited current loop controller with motor current of four-wheel drive electric vehicle is used. Photovoltaic array and DC motor model are obtained in the Simulink. The proposed system control mechanism is digitally simulated by using the MATLAB/ Simulink/Sim-Power Systems software. The dynamic performance of the system is brought into at the constant speed reference and the variable speed reference trajectory. View full abstract»

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  • Solar Photovoltaic Array's Shadow Evaluation Using Neural Network with On-Site Measurement

    Page(s): 44 - 49
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5218 KB) |  | HTML iconHTML  

    This paper proposes a method to accurately predict the maximum output power of the solar photovoltaic arrays under the shadow conditions by using neural network, a combined method using the multilayer perceptrons feed forward network and the backpropagation algorithm. Using the solar irradiation levels, the ambient temperature and the sun's position angles as the input signals, and the maximum output power of the solar photovoltaic array as an output signal, the training data for the neural network is received by measurement on a particular time, when solar panel is shaded. After training, the neural network model's accuracy and generalization are verified by the test data. This model, which is called the shading function, is able to predict the shadow effects on the solar PV arrays for long term with low computational efforts. View full abstract»

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  • Modeling Photovoltaic DC primary sources as grid connected inverter supplies considering non linear effects

    Page(s): 50 - 55
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    The aim of the present work is to propose and describe a complete photovoltaic DC source model that can supply grid connected inverters, which are usually employed in distributed generation plants as interconnection to the power system. The main advantage of this model is that all non ideal characteristics of the photovoltaic (PV) source are taking into account, and complex weather conditions patterns can be included in the model to simulate, study and predict the effects of increasing penetration of PV generators in the grid. The model includes: A photovoltaic array consisting of 34 photovoltaic modules with total peak power of 7412 Wp and a boost-buck DC-DC converter that operates to assure maximum power extraction by using a maximum power point tracking (MPPT) algorithm based on the incremental conductance method. View full abstract»

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  • Effect of Low Voltage Ride Through Technologies on Wind Farm

    Page(s): 56 - 61
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (6743 KB) |  | HTML iconHTML  

    Doubly fed induction generators (DFIG) offer many advantage when used with wind turbines. Given their configuration, they are particularly sensitive to grid faults. As many countries now require wind turbine generators to remain connected to the grid during faults, low voltage ride through solutions are being developed to fulfill this new requirement. This paper offers a comparison of different LVRT solutions. The effects of each method on a small network containing both conventional generators and wind turbines are investigated. The performance of the different solutions is evaluated based on the wind turbines response. View full abstract»

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  • Design of a Robust Speed and Position Sensorless Decoupled P-Q Controlled Doubly-Fed Induction Generator for Variable-Speed Wind Energy Applications

    Page(s): 62 - 67
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4910 KB) |  | HTML iconHTML  

    This paper proposes an implementation of a decoupled P-Q control of a DFIG that does not rely on mechanical sensors and a speed and position sensorless algorithm that is robust to variations of the values of the machine parameters. In this paper, the sensorless control is based on a modified phase-locked loop with an improved positioning algorithm. This eliminates the need to estimate the speed based on the machine parameters, which results in a significant improvement in speed control robustness to parameter variations. In addition, the algorithm avoids using differentiation which can lead to significant inaccuracy due to the noise inherent in measured signals. Theoretical and simulation results were validated on an experimental setup, using a laboratory 5 hp DFIG. View full abstract»

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  • The impact of power converter technologies on stand alone wind turbine applications

    Page(s): 68 - 73
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3509 KB) |  | HTML iconHTML  

    Stand alone renewable energies are feedback to the local network with by a converter. The motor technology as well as the converter technology have a strong impact on the conversion efficiency. This work presents a study of these technologies on the energy conversion. The asynchronous machine driven by a DTFC control is compare with a brushless DC motor driven by a field oriented control. The study is realized with IGBT and MOSFET inverters with losses computed for each technologies. This approach, which can be adapted to any simulation tool, is useful to determine the selection of a technology for a long time investment. Simulation results are shown to demonstrate the effectiveness of the proposed approach. View full abstract»

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  • Flicker Contribution of a Wind Power Plant with Single and Multiple Turbine Representations

    Page(s): 74 - 79
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5919 KB) |  | HTML iconHTML  

    In order to study the impact of a wind power plant on network power quality all electrical, mechanical and aerodynamic aspects of wind turbines must be studied. Moreover, the contribution of every wind turbine on the wind power plant should be considered. Representing a large wind power plant by a single wind turbine (WT) or a few wind turbines results in a severer situation with regards to power quality. In the paper, however, a previously introduced wind power plant representation method, so called "quasi-multiple turbine representation (QMTR) method", is used to consider the effect of all WTs of the wind farm. It is shown that Simulink, FAST, AeroDyn, and TurbSim can be used to model the electrical, mechanical, and aerodynamic aspects of a wind power plant with 96 fixed-speed WTs. The model is used to calculate the voltage, active, and reactive powers at point of common coupling (PCC). Flicker is one of the most important power quality measures. It is induced by voltage fluctuations, which are caused by load flow changes in the grid. Modelling of an IEEE standard flickermeter in Simulink environment, instantaneous flicker sensations for two different wind power plant representations are compared. It will be shown that the QMTR method, which considers all WTs of the wind farm shows less flicker at PCC. View full abstract»

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  • A Practical Method for Estimation of Fault Ride-Through Capability of Wind Power Farms Based on Squirrel-Cage Rotor Induction Generators

    Page(s): 80 - 84
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    This paper presents a practical method for estimation of fault ride-through capability of wind power farms composed by squirrel-cage rotor induction generators. The proposed method is based on the steady-state equivalent circuit of the induction generator and on the concepts of stable and unstable electrical-mechanical equilibrium points, which are calculated in the electrical and mechanical torque versus rotor speed space. The method has been validated by comparing the results obtained by the analytical method with those determined by dynamic simulation results. View full abstract»

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