• Title, Summary, Keyword: synchronous generator

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Simulation Analysis and Development of Matlab/Simulink Model for Stand-alone Operation of Emergency Diesel Synchronous Generator-based Hybrid Energy System (비상용 디젤동기발전시스템기반 독립운전 하이브리드에너지시스템 모델 설정 및 시뮬레이션 분석에 관한 연구)

  • Hong, Won-Pyo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.1
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    • pp.70-79
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    • 2015
  • In this paper, enhanced stand-alone operation and development of Matlab/Simulink model of emergency diesel based hybrid energy system is presented. Simulations based on the remote community or islands were performed for PV-diesel-battery hybrid system. Modeling of PV-diesel-battery integrated system is done to perform under the solar radiation and load conditions on Matlab/Simulink platform. The models of diesel generator unit, battery energy storage system, PV and frequency-power control are developed and simulation studies have been carried out under various conditions using Matlab/Simulink and SimPowerSystem. It is demonstrated that the proposed system can provide reliable and good quality power to the customers in diesel synchronous generator-based hybrid energy systems.

Characteristics Analysis for Motor or Generator Operating of Induction Machine with Deep or Double Cage Rotor (심구 또는 이중 농형 회전자를 가진 유도기의 전동 또는 발전 운전시 특성 해석)

  • Kim, Jong-Gyeum
    • New & Renewable Energy
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    • v.10 no.4
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    • pp.3-8
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    • 2014
  • Both of induction generator and synchronous generator is available in the hydroelectric power plant. If the output of the power station is large, the synchronous generator is mainly used but when its output is low, the induction generator is often used. If the output capacity is small, there is a case in which induction motor is used as a generator. Torque at rated operation and start of the induction motor is different depending on the shape of the rotor. Small and medium-sized squirrel-cage induction motor is used primarily double cage rotor or deep bar. In this study, we attempt to interpret characteristics for double cage rotor or deep bar that occur when operating in the induction generator based on the parameters that have been designed and manufactured as an induction motor.

A Study on the Voltage Drop of Induction Generator along the Rotor Shape (회전자 형상에 따른 유도발전기 전압강하에 대한 연구)

  • Kim, Jong-Gyeum
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.64 no.2
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    • pp.62-66
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    • 2015
  • Induction generator is easy to durability and maintenance than the synchronous generator. So, recently Induction generator has been widely applied to small-scale hydroelectric power plant. When the rotor is operating faster than synchronous speed, induction machine can generate electric power. Induction generator has a large inrush currents, such as the starting current of the induction motor. Induction motor has been designed a variety of rotor shape in order to reduce starting current. Since the occurrence of high inrush current cause a voltage drop to the system, it will need to reduce possible. Because the starting current of the squirrel-cage induction motor varies in accordance with the rotor shape, it is necessary to analyze the magnitude of inrush current in order to apply to the generator. In this study, we analyzed the inrush current and the voltage drop caused in accordance with the rotor shape of 1500kw induction generator.

Analysis and Design of high-efficiency Permanent Magnet Synchronous Motor/Generator for Renewable Energy Application (신재생 에너지 적용을 위한 고효율 영구자석 동기 전동/발전기의 해석 및 설계)

  • You, Dae-Joon;Kim, Il-Jung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.5
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    • pp.955-964
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    • 2011
  • In renewable energy system such as flywheel energy storage system, wind power and solar power, the motor/generator is the important key for offering the electric energy to the electric loads. For example, the heavy and large flywheel is rotated by electromagnetic torque of pemanent magnet synchronous motor (PMSM) and, in case of a breakdown of electric current, the PMSM used as generator supplies electric energy for the various electric utilities using mechanical rotation energy of the flywheel. Thus, design of a motor/generator should be performed in effort to reduce cogging torque and electromagnetic loss for high efficiency. In our paper, a slotless permanent magnet synchronous motor/generator (SPMSM/G) with output power 15kW at the rotor speed 18000rpm is designed from electromagnetic analysis and dynamic performance analysis. In analytical approach, design parameters such as back electro-motive force (back EMF), inductance and electromagnetic torque are derived from analytical method which is one of the electromagnetic analysis method. And using the design parameters, this paper deal with system design considering the driving characteristics and electric load in required power. Finally, the analytical results are verified by the experiment and finite element method (FEM).

Modeling and Voltage Variation Simulation of a Permanent Magnetic Synchronous Generator Wind Turbine Systems (영구자석 동기형 풍력발전시스템 모델링 및 전압변동 시뮬레이션)

  • Kim, Hong-Woo;An, Hae-Joon;Jang, Gil-Soo;Kim, Sung-Soo;Ko, Hee-Sang
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.8
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    • pp.116-123
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    • 2009
  • This study performs modelling and simulation of permanent magnetic synchronous generator wind turbine by using Matlab & Simulink. In simulation, change of wind velocity, change of load, and voltage decrease of infinite bus are performed. Through such simulation, different with wiring system that there is only existing load, this study can confirm problems and voltage changing characteristics, which can occur in distributed electric power that load and electric power is mixed and operated, especially, in interconnecting with wind power generation.

A study on improvement of the control performance of the automatic voltage regulator of a brushless synchronous generator (브러쉬리스 동기발전기 자동전압조정기의 제어성능 향상을 위한 연구)

  • Lee, Youngchan;Kim, Jongsu;Jung, Byung-Gun
    • Journal of the Korean Society of Marine Engineering
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    • v.38 no.7
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    • pp.909-915
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    • 2014
  • Terminal voltage of the Automatic Voltage Regulator(AVR) of brushless synchronous generator is generally being controlled by PID Control way in shore and ship field. However, in case of changeable large load on power system, PID control method is deficiency to respond output voltage with settling time. Hence, taking into consideration this situation, it is required new control method. In this thesis, we propose Fuzzy Logic Control(FLC) which has more optimal robust control way in order to respond varying values of terminal voltage to the brushless synchronous generator through simulation of MATLAB/SIMULINK and prove Fuzzy logic control more optimal compared with PID control.

Design of the Synchronous generator and SVC controller Using LQG/LTR (LQG/LTR에 의한 동기발전기와 SVC의 제어기 설계)

  • Lee, Dong-Hee;Lee, Byung-Ha
    • Proceedings of the KIEE Conference
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    • pp.227-229
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    • 2000
  • This paper presents a LQG/LTR method for controlling the PSS and SVC effectively. A one-machine Infinite-bus power system is used as an analysis system, where PSS is installed at the synchronous generator and SVC at the generator bus as a parallel compensation device. The simulation results show that the LQG/LTR controller of PSS and SYC improves the power system stability effectively.

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A Voltage Control of Variable-Speed Synchronous Generator (가변속 동기발전기의 전압제어)

  • Kong, Jeong-Sik;Seo, Young-Taek;Oh, Chul-Soo
    • Proceedings of the KIEE Conference
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    • pp.202-204
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    • 1994
  • This paper is describing a voltage control of variable speed synchronous generator for wind-per generation system. The exciting system is adopted that the generator operates in a variable frequency and constant voltage. The generating voltage is controlled by field current varying the firing angle controller.

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Analysis of cross magnetizing effect on the generator characteristics (발전기 특성에 미치는 교차자화 포화현상의 영향 해석)

  • Kim, Deok-Young;Rho, Kyu-Min;Kwon, Sae-Hyuk
    • Proceedings of the KIEE Conference
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    • pp.1224-1227
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    • 1998
  • This paper presents an effect of cross magnetization to the generator characteristics in synchronous machine infinite bus system. Eigenvalues, synchronous torque and damping torque are investigated as the operating condition of the system is changed variously. The simulation results show that cross magnetization has an important effect to the generator characteristics in steady state stability analysis.

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