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On the Characteristics of the Hybrid Synchronous Generator  [cached]
Advances in Electrical and Computer Engineering , 2007,
Abstract: This paper presents the results obtained by experimental tests on a hybrid synchronous generator (H.S.G.) with three-phase stator winding, star and delta connected. The working characteristics are analyzed and compared in order to establish the advantages and disadvantages of using one ore the other connection type. For more conclusive results, the harmonic content of generated voltage and current under different working conditions has been analyzed.
Design and Implementation of a Fuzzy Logic Controller for Synchronous Generator  [cached]
Naeim Farouk,Liu Sheng
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: The electrical power generation and distribution in power plant suffers from so many problems, such as instability of demand and generation. These lead to increase of generation cost. In this study, self-tuning fuzzy PID controller is developed to improve the performance of automated voltage regulation of a synchronous generator. The controller is designed based on the mathematical model of the system, which is estimated by using system identification technique. Simulation was carried out using Matlab Program to get the output response of the system. In addition, we used root locus methods before and after adding the PID controller. From the results, we conclude that the overall system response was improved significantly when using selftuning fuzzy PID controller.
Sliding Mode Control for the Synchronous Generator  [PDF]
Yaote Chang,Chih-Chin Wen
ISRN Applied Mathematics , 2014, DOI: 10.1155/2014/256504
Abstract: Based on the Lyapunov stability theorem and sliding mode control technique, a design of the nonlinear controller is proposed for the dual-excited and steam-valving control of the synchronous generators with matched and mismatched perturbations in this paper. By using some constant gains designed in the sliding surface function, the perturbations in the power system can be suppressed, and the property of asymptotical stability of the rotor angle and the voltage can be achieved at the same time. 1. Introduction To achieve a high degree of reliability in the power systems, many works [1–11] have studied the stability of generators. In general, there are two ways to stabilize the generators: the excited control [1–3] and the steam-valving control [4–7]. Using the excited control, Xie et al. [1] designed a linear matrix inequality (LMI) controller for a class of multimachine power systems with uncertain parameters to achieve the property of asymptotical stability. Galaz et al. [2] proposed a passivity-based controller and discussed the domain of attraction of the equilibria in power systems. Huang et al. [3] utilized a physical exact linearization method to design a controller for a dual-excited synchronous generators. For the steam-valving control, Zhang and Sun [4], Fu [5], Li et al. [6], and Li et al. [7] designed the adaptive backstepping controller for single machine infinite bus system in the presence of internal and external disturbances to achieve the property of asymptotical stability. As for the systems with both steam turbine dynamics and the excited generator, Xi et al. [8] and Ma et al. [9] presented a novel nonlinear controller based on Hamiltonian energy theory steam for the turbine dynamics and single excited generator to achieve the property of asymptotical stability. The dual-excitation means the system has -axis and -axis field winding simultaneously. Each field voltage can be adjusted separately and hence the control objectives can be achieved more flexibly. Based on the passive lemma, Wang and Lin [10] designed the bounded passivity controller for the synchronous generators to achieve the property of asymptotical stability. Using the coordinated passivation technique, Chen et al. [11] designed backstepping controller for steam-valving and dual-excited synchronous generators to achieve the property of asymptotical stability. However, the perturbations were not considered in the works [10, 11]. Sliding mode control (SMC) is well known to possess several advantages, for example, fast response, good transient performance, robustness of
International Journal of Engineering Science and Technology , 2013,
Abstract: In this research paper provided the information about low-voltage ride-through (LVRT) scheme for the permanent magnet synchronous generator (PMSG), and wind energy conversion system. The dc-link voltage is uncomfortable by the generator side converter instead of the grid-side converter (GSC). Considering the nonlinear correlation between the generator speed (ωm) and the dc-link voltage (Vdc), a dc-link Voltage controller is anticipated using a hysteresis current controller. Among all, low-voltage ride-through has been fundamental in the field, which is one of the most important challenges for wind energy conversion system. It is essential to design an included controller to protect the converter from overvoltage/overcurrent and to support the grid voltage during faults and recoveries. A unified dc-link voltage control scheme and hysteresis current controller based wind energy conversion system is proposed. The controllers for grid-side converters are coordinated to provide fault ride-through capability. The generator side is forced by space vector modulationand grid side implemented hysteresis current controller. The Grid Side Controller controls the grid active power and maximum power deliver to the grid. The ability of this control algorithm has been confirmed by simulation results.
Prediction of the Inductance in a Synchronous Linear Permanent Magnet Generator  [PDF]
Boel Ekerg?rd, Rafael Waters, Mats Leijon
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.35025
Abstract: This paper presents calculations of the varying inductances profile for a synchronous linear surface mounted permanent magnet generator in an ABC reference system. Calculations are performed by utilizing the reluctance term, known from analytic calculations and finite element method simulations. With the inductance term identified, the voltage difference between the generator’s no load and load voltage can be calculated and an external circuit can be designed for optimal use of the generator. Two different operation intervals of the linear generator are considered and the results are discussed. The result indicates that time costly finite element simulations can be replaced with simple analytical calculations for a surface mounted permanent magnet linear generator.
Comparative Analysis of Intelligent Controllers for Permanent Magnet Synchronous Motor Drive Systems
Noureddine Guersi,Messaoud Djeghaba,Messaoud Ramdani
Asian Journal of Information Technology , 2012,
Abstract: The PMSM (Permanent Magnet Synchronous Motor) drive systems are often used in electrical drives because of their simple structures, ease of maintenance and efficiency. However, the nonlinear behaviour which arises mainly from motor dynamics and load characteristics and the presence of uncertainties make their control an extremely difficult task. So, the speed control strategy should be adaptive and robust for successful industrial applications. To handle the control issue more effectively, three artificial intelligence control strategies namely, Fuzzy Logic (FL), Artificial Neural Network (ANN) and Neuro-Fuzzy (NF) are proposed since they require only a reduced computation power, while maintaining satisfactory static and dynamic performance and a good insensitivity to perturbations and parameter uncertainties. The traditional back-propagation learning algorithm is used for training the ANN and the NF controllers. The performances of the three control strategies are investigated and compared in simulation. The results show that the intelligent controllers are reliable and highly effective in the speed control of the PMSM.
Simulation of Advanced ELC with Synchronous Generator for Micro Hydropower Station  [PDF]
International Journal of Advanced Electrical and Electronics Engineering , 2013,
Abstract: This paper presents an analysis and design of an Electronic Load Controller (ELC) for standalone synchronous generator suitable for micro hydropower stations. ELC is basically used to maintain the constant power at the generator terminals, which in turn helps to maintain the system frequency constant. The designed ELC consists of a controlled bridge rectifier-chopper system feeding a resistive dump load whose power consumption is varied through the duty cycle of the chopper. Proper design of rectifier, chopper and dump load is very important for trouble free operation of ELC. The ELC is designed and simulated in MATLAB using Simulink. This scheme can be efficiently used in micro hydropower stations.
Determination of a synchronous generator characteristics via Finite Element Analysis  [PDF]
Kolondzovski Zlatko,Petkovska Lidija
Serbian Journal of Electrical Engineering , 2005, DOI: 10.2298/sjee0502157k
Abstract: In the paper a determination of characteristics of a small salient pole synchronous generator (SG) is presented. Machine characteristics are determined via Finite Element Analysis (FEA) and for that purpose is used the software package FEMM Version 3.3. After performing their calculation and analysis, one can conclude that most of the characteristics presented in this paper can be obtained only by using the Finite Element Method (FEM).
Modeling and Implementation of Generator and Network Simulator for Static Exciters using Matlab and Labview
M.E. Iranian,Amin Zabihinejad
Journal of Applied Sciences , 2011,
Abstract: Automatic voltage regulator AVR is designed for synchronous generator to keep the terminal voltage of the generator to the rated value. This study presents a linear mathematical model of the synchronous generator to simulate the electrical section of a gas power plant and do the functional test of a real excitation system. The complete system is mainly included synchronous machine, governor, gas turbine and transmission line. The simulator allows to analyze and verify tuning and performance of excitation system with limiter circuits and Power System Stabilizer (PSS). The method is specially developed for transient analysis of synchronous machines given by linear differential equations. Details such as the exciter circuit, turbine and governor systems of a synchronous machine which is linked to an infinitive bus through two equivalent lines are given and this system is implemented in SIMULINK. To build the communication with excitation cubicle, Simulink software was linked to LabVIEW (Laboratory Virtual Instrument Engineering Workbench) by Simulation Interface Toolkit (SIT Server).
Speed and Current Control of Permanent Magnet Synchronous Motor Drive Using IMC Controllers  [cached]
Advances in Electrical and Computer Engineering , 2012, DOI: 10.4316/aece.2012.04001
Abstract: The paper describes a current and speed control of the permanent magnet synchronous motor with vector control. For a current and speed controller, the Internal Model Control (IMC) method was chosen for its good tracking capability and demands on the controllers. A short analysis of the IMC method for design of the current and speed controller has been made. The paper contains mathematical description of the IMC controller design. Simulation and experimental results of the vector controlled AC drive with interior permanent magnet synchronous motor are shown to present features of the current and speed controller.

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