• Title, Summary, Keyword: synchronous generator

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Development of Shorted-Turn Sensor for Synchronous Generator's Field Winding (동기발전기 계자권선의 층간단락 감지센서 개발)

  • Cho, Ji-Won;Lee, Byung-Ha;Lee, Young-Jun
    • Proceedings of the KIEE Conference
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    • pp.2114-2116
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    • 1999
  • The shorted-turn sensor for synchronous generator's field winding has been developed. The sensor, installed in the generator air-gap, senses the slot leakage flux of field winding and produces a voltage waveform proportional to the rate of change of the flux. For identification of reliability for sensor, a shorted-turn test was performed at the Seoinchon combined cycle power plant on gas turbine generator. This sensor will be used as a detecting of shorted-turn for synchronous generator's field winding.

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Blushless Synchronous Generator Design and Performance Characteristic Analysis (브러시리스 동기 발전기의 설계 및 성능 특성 해석)

  • Park, Yong-Sik;Kim, Sung-Joo;Jung, Hyun-Ho;Koo, Dae-Hyun;Jung, Gun-Seok;Cho, Yun-Hyun
    • Proceedings of the KIEE Conference
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    • pp.1021-1023
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    • 2003
  • In this paper, to design and performance analysis of brushless synchronous generator is presented. To identify the performance of the designed brushless synchronous generator, the prototype generator is manufactured and estimated as the terminal voltage and frequency when the rated load is given to the generator.

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T-S Fuzzy Modeling of Synchronous Generator in a Power System (전력계통 동기발전기의 T-S Fuzzy 모델링)

  • Lee, Hee-Jin;Baek, Seung-Mook;Park, Jung-Wook
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.9
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    • pp.1642-1651
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    • 2008
  • The dynamic behavior of power systems is affected by the interactions between linear and nonlinear components. To analyze those complicated power systems, the linear approaches have been widely used so far. Especially, a synchronous generator has been designed by using linear models and traditional techniques. However, due to its wide operating range, complex dynamics, transient performances, and its nonlinearities, it cannot be accurately modeled as linear methods based on small-signal analysis. This paper describes an application of the Takaki-Sugeno (T-S) fuzzy method to model the synchronous generator in a single-machine infinite bus (SMIB) system. The T-S fuzzy model can provide a highly nonlinear functional relation with a comparatively small number of fuzzy rules. The simulation results show that the proposed T-S fuzzy modeling captures all dynamic characteristics for the synchronous generator, which are exactly same as those by the conventional modeling method.

A Study on Parameter Estimation of the Synchronous Generator System based on the Modified PSO (PSO 기반 동기발전기 시스템 모델정수 추정에 관한 연구)

  • Choi, Hyung-Joo;Kim, In-Soo;Lee, Heung-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.1
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    • pp.8-15
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    • 2015
  • This paper includes a method for estimating the parameter of a synchronous generator and exciter using the modified particle swarm optimization. A solid round rotor synchronous generator and exciter have been modeled with the saturation function. They are regarded as state of being cooperative to a infinite bus. The behavior characteristic of all particles assigned to a parameter needs to be reflected in the PSO algorithm to fine out more close result to the optimal solution. The results of the simulation to estimate the parameters of the synchronous generator and exciter in the modified PSO algorithm are described.

A Study of Analysis for Small Buried Type Permanent Magnet Synchronous Generator Considering Armature Resistance Effect (전기자 저항의 영향을 고려한 소형 영구자석 매입형 동기발전기 정상상태 특성 해석 연구)

  • Hong, Sun-Ki
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.3
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    • pp.380-383
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    • 2012
  • Small permanent magnet generator can be used not only as an emergency power source but also an exciting power source of generator for small generating systems because it does not need the external exciting power source. Especially the air-gap flux density of the buried PM synchronous generator can be increased more than that of the permanent magnet. In this study, the analysis of the small buried type PM synchronous generator is performed. From the phasor diagram considering armature resistance for exact analysis, analytic equations are induced and the efficiency, developed voltage, load current are calculated. The experimental results are compared with the calculated results for the appropriateness.

The Improvement Output of the Synchronous Generator Excitor using CRA control method (CRA 제어기법을 이용한 동기발전기 여자기의 출력 개선)

  • Hong, Hyun-Mun
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.449-450
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    • 2008
  • It is difficult to find for analysis solution of the synchronous generator exciter system. Recently, it had good performence UPS converter system using CRA method. The single converter of synchronous generator excitor system under considerations : (i) the overall system shall keep very low AC-voltage tracking error as well as no phase delay over different load condition, and (ii) the digital controller shall be employed at a fixed sampling. It is shown that the synchronous exciter system can be achieved by the proposed controller using Characteristic Ratio Assignment.

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Characteristics of Synchronous Generator with Power Static Converter (전력변횐기를 가지는 동기발전기의 특성)

  • 이승원;권영안
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.33 no.1
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    • pp.1-8
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    • 1984
  • The system of synchronous generator with power static converter are analyzed in detail and the output characteristics of generator are computed by digital simulation. The power static converter is considered as 3-phase converter in which the interlude interval and the commutation interval repeats itself six times per cycle. The synchronous generator is considered as a direct-phase quantities model for a more exact study of the performance. As the numerical method for nonlinear differential equations of the system, the Runge -Kutta method is used.

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Output Characterization Analysis of Induction Generator using Test Data (시험 데이터를 이용한 유도발전기의 출력 특성 분석)

  • Kim, Jong-Gyeum
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.7
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    • pp.1027-1032
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    • 2013
  • Induction generator is used primarily in small hydroelectric power station less than 1000kW recently. Unlike the synchronous generator, induction generator produces electricity when it is rotated above synchronous speed. In this study, we calculated the parameters of the induction generator with test reports presented by the manufacturer and analyzed that how much the induction generator has produced power near the rated speed. If we can use the test data to calculate the parameters, it is possible the output characteristics analysis of the induction generator. As a result of analysis, we concluded that output of induction generator varies sensitively for small changes in rotational speed in the near synchronous speed.

A Novel Three-Phase Four-Wire Grid-Connected Synchronverter that Mimics Synchronous Generators

  • Tan, Qian;Lv, Zhipeng;Xu, Bei;Jiang, Wenqian;Ai, Xin;Zhong, Qingchang
    • Journal of Power Electronics
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    • v.16 no.6
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    • pp.2221-2230
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    • 2016
  • Voltage and frequency stability issues occur in existing centralized power system due to the high penetration of renewable energy sources, which decrease grid absorptive capacity of them. The grid-connected inverter that mimics synchronous generator characteristics with inertia characteristic is beneficial to electric power system stability. This paper proposed a novel three-phase four-wire grid-connected inverter with an independent neutral line module that mimics synchronous generators. A mathematical model of the synchronous generator and operation principles of the synchronverter are introduced. The main circuit and control parameters design procedures are also provided in detail. A 10 kW prototype is built and tested for further verification. The primary frequency modulation and primary voltage regulation characteristics of the synchronous generator are emulated and automatically adjusted by the proposed circuit, which helps to supports the grid.

Impact of Fixed Series Capacitors and SSSC on the LOE Protection of Synchronous Generator

  • Ghorbani, Amir;Lima, Hossein Mehryari;Azadru, Allahverdi;Mozafari, Babak
    • Journal of Electrical Engineering and Technology
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    • v.10 no.4
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    • pp.1453-1459
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    • 2015
  • Loss of excitation (LOE) relay is prevalently used to protect synchronous generator. The widely used method for synchronous generator LOE protection is a negative offset mho relay with two zones. The basis of this relay is identical to mho impedance relay. In other words, this relay calculates impedance by measuring voltage and current at the generator terminal. On the other hand, the presence of series compensation, changes measured voltage and current signals during loss of excitation. This paper reveals that the presence of series compensators such as fixed series capacitors (FSCs) and static synchronous series compensator (SSSC) causes a significant delay on the performance of generator LOE relay. It is also shown that the presence of SSSC causes the LOE relay to be under-reached. Different operating modes of the power system, the SSSC and also different percentages of series capacitive compensations have been considered in the modeling. All the detailed simulations are carried out in the MATLAB/Simulink environment using the SimPowerSystems toolbox.