• Title/Summary/Keyword: synchronous generator

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A Study on the Parallel Operation Strategy of Small Wind Turbine System for Battery Charging (배터리 충전을 위한 소형풍력 발전 시스템의 병렬 운전방안에 관한 연구)

  • Son, Yung-Deug;Ku, Hyun-Keun;Kim, Jang-Mok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.19 no.6
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    • pp.549-556
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    • 2014
  • This study proposes a parallel operation strategy for small wind turbine systems. A small wind turbine system consists of blade, permanent magnet synchronous generator, three-phase diode rectifier, DC/DC buck converter, and the battery load. This configuration has reliability, simple control algorithm, high efficiency, and low cost. In spite of these advantages, the system stops when unexpected failures occur. Possible failures can be divided into mechanical and electrical parts. The proposed strategy focuses on the failure of electrical parts, which is verified by numerical analysis through equivalent circuit and acquired general formula of small wind power generation systems. Simulation and experimental results prove its efficiency and usefulness.

Grid-friendly Characteristics Analysis and Implementation of a Single-phase Voltage-controlled Inverter

  • Zhang, Shuaitao;Zhao, Jinbin;Chen, Yang;He, Chaojie
    • Journal of Power Electronics
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    • v.17 no.5
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    • pp.1278-1287
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    • 2017
  • Inverters are widely used in distributed power generation and other applications. However, their lack of inertia and variable impedance may cause system instability and power transfer inaccuracy. This paper proposes a control scheme for a single phase voltage-controlled inverter with some grid-friendly characteristics. The proposed control algorithm enables the inverter to function as a voltage source with an inner output impedance in both the islanded and grid-connected modes. Virtual inertia and rotor equations are embedded in the PLL part. Thus, the frequency stability can remain. The inner output impedance can be adjusted freely, which helps to accurately decouple and transmit the output active and reactive power. The proposed inverter operates like a traditional synchronous generator. Simulations and experiments are designed and carried out to verify the proposed control strategy.

Fuzzy Syntactic Pattern Recognition Approach for Extracting and Classifying Flaw Patterns from and Eddy-Current Signal Waveform

  • Kang, Soon-Ju
    • Journal of Electrical Engineering and information Science
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    • v.2 no.4
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    • pp.59-65
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    • 1997
  • In this paper, a general fuzzy syntactic method for recognition of flaw patterns and for the measurement of flaw characteristic parameters for a non-destructive inspections signal, called eddy-current, is presented. Solutions are given to the subtasks of primitive pattern selection, signal to symbol transformation, pattern grammar formulation, and event-synchronous flaw pattern extraction based on the grammars. Fuzzy attribute grammars are used as the model for the pattern grammar because of their descriptive power in the face of uncertain constraints caused by nose or distortion in the signal waveform, due to their ability to handle syntactic as well as semantic information. This approach has been implemented and the performance of eh resultant system has been evaluated using a library of law patterns obtained from steam generator tubes in nuclear power plants by an eddy current-based non-destructive inspection method.

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A study for analysis of internal permanent magnet synchronous generator (내삽형 자석 동기 발전기 특성 해석에 관한 연구)

  • Lee, Kwang-Ho;Hong, Sun-Ki;Jang, Joong-Hak;Kwon, Hyk-Ki
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.873-874
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    • 2006
  • 이미, 동기 발전기는 크게는 발전소에서 작게는 소형 자가 발전에 이르기까지 널리 사용되고 있다. 그러나, 수요는 급격히 증가하고 있으나 이에 대응할 수 있는 기술은 적절히 대응하지 못하고 있는 듯하다. 즉, 수요가 증가함에 따라 발전 시스템의 고효율화, 소형화는 당연한 요구사항이나, 현재 동기 발전기는 기존의 별 다른 진전이 없이 고전적인 방법에 의해 생산되고 있다. 그래서 정밀한 해석 기술에 바탕을 두어 내삽형 자석 동기 발전기의 설계치가 도출될 것으로 기대된다.

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A Basic Study on the Desist of Vertical Axis Darrieus Turbine for Wind-Power Generating System (수직축 Darrieus 풍력발전 시스템의 설계에 관한 기초연구)

  • Seo, Young-Taek;Kim, Gi-Seung;Oh, Chul-Soo
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.82-84
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    • 1994
  • This paper presents a design of vertical axis Darrieus wind turbine for wind-power generating system. The wind turbine consists of two troposkien blades, diameter is 10m approximately, and chord length 380mm, tip ratio speed 4. The design of turbine is laid for the main data of rated wind speed 10m/s, turbine speed 78rpm, the generating power is estimated to 25kW, and this is contorted to commercial power line by means of three phase synchronous generator-inverter system.

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Development of a Wind Turbine Monitoring System based on LAN by using LabVIEW (LabView를 이용한 LAN 환경에서의 풍력발전 원격감시 제어시스템 구현)

  • Hong, Moo-Kyoung;Jo, In-cheol;Lee, Hong-Hee
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.292-294
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    • 2008
  • 최근 환경 파괴와 에너지 고갈에 대한 문제들이 사회의 큰 문제로 대두 되면서 풍력발전의 중요성이 증가하고 있다. 본 논문에서는 LabVIEW를 이용하여 이더넷(Ethernet) 환경에서의 풍력발전 원격감시 제어시스템을 구현하였다. 제안된 원격감시 제어시스템은 풍력발전 시스템의 MCU와 W5100의 SPI(Serial Peripheral Interface)를 통한 이더넷 통신용 하드웨어를 구축하였으며, NI사의 LabVIEW를 이용하여 서버상의 HMI(Human Machine Interface) 소프트웨어를 구현하였다. 본 연구의 실험을 위해 영구자석형 동기 발전기(PMSG:Permanent Magnet Synchronous Generator)를 이용하여 풍력발전 시스템 모델을 구현하고 이를 이용하여 원격감시 제어시스템의 성능을 검증하였다.

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A Hierarchical Test Generation for Asynchronous Circuits

  • Eunjung Oh;Kim, Soo-Hyun;Lee, Dong-Ik;Park, Ho-Yong
    • Proceedings of the IEEK Conference
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    • 2002.07c
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    • pp.1968-1971
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    • 2002
  • In this paper, we have presented a test- ing method for a kind of asynchronous circuits. Tar- get circuit model is the 3D machine that is one of the most successful implementation of extended burst-mode (XBM) machines. We present a high-level test generation method for the 3D machine using the specification of the circuit. We also present a gate-level test pattern generation method using a synchronous test pattern generator. Experimental results show that the combination of the above two methods achieves high fault coverage over 3D machines and saves test generation time.

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Optimization of Battery Storage Capacity with Min-Max Power Dispatching Method for Wind Farms

  • Nguyen, Cong-Long;Kim, Hyung-Jun;Lee, Tay-Seek;Lee, Hong-Hee
    • Proceedings of the KIPE Conference
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    • 2013.07a
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    • pp.238-239
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    • 2013
  • It is a crucial requirement to utilize an economical battery capacity for the wind energy conversion system. In this paper, the optimal BESS capacity is determined for the wind farm whose dispatched power is assigned by the min-max dispatching method. Based on a lifetime cost function that indicates the BESS cost spent to dispatch 1kWh wind energy into grid, the battery capacity can be optimized so as to obtain the minimum system operation cost. Moreover, the battery state of charge (SOC) is also managed to be in a safe operating range to ensure the system undamaged. In order to clarify the proposed optimizing method, a 3MW permanent magnet synchronous generator (PMSG) wind turbine model and real wind speed data measured each minute are investigated.

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Comparison of High Power Semiconductor Devices in 5MW PMSG MV Wind Turbines

  • Lee, Kihyun;Jung, Kyungsub;Suh, Yongsug;Kim, Changwoo;Cha, Taemin;Yoo, Hyoyol;Park, Sunsoon
    • Proceedings of the KIPE Conference
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    • 2013.07a
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    • pp.386-387
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    • 2013
  • This paper provides a comparison of high power semiconductor devices in 5MW-class Permanent Magnet Synchronous Generator (PMSG) Medium Voltage (MV) wind turbines. High power semiconductor devices of IGBT module type, IGBT press-pack type, and IGCT of both 4.5kV and 6.5kV are considered in this paper. Benchmarking is performed based on neutral-point clamed 3-level back-to-back type voltage source converter supplied from grid voltage of 4160V. The feasible number of semiconductor devices in parallel is designed through the loss analysis considering both conduction and switching losses under the given operating conditions of 5MW-class PMSG wind turbines, particularly for the application in offshore wind farms. The loss analysis is confirmed through PLECS simulations. The comparison result shows that IGBT press-pack type semiconductor device has the highest efficiency and IGCT has the lowest cost factor considering the necessary auxiliary components.

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Transient-Sub transient Characteristic Modeling of Synchronous Generator using MATLAB-SIMULINK (MATLAB-SIMULINK를 이용한 동기발전기 과도-차과도 특성 모델링)

  • Lee, Gang;Jo, Jongmin;Kim, Jichan;Cha, Hanju
    • Proceedings of the KIPE Conference
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    • 2019.11a
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    • pp.164-165
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    • 2019
  • 본 논문은 3상 동기발전기의 과도 특성을 분석하기 위해 MATLAB/ SIMULINK를 이용하여 모델링하였으며 동기발전기 출력단의 개방 및 3상 단락 회로 조건에 따른 특성곡선을 분석하였다. 정상상태, 과도상태 및 차과도상태 구간에서 고정자 권선, 회전자 권선 및 댐퍼 권선 등이 갖는 자기 인덕턴스 및 상호 인덕턴스 특성 관계와 자속 변화특성 등을 수학적 모델 기반의 소신호 모델링을 통해 3상 동기발전기를 등가적으로 모델링하였다. 시뮬레이션을 통해 얻은 값에 의해 과도상태와 차과도상태의 모터 데이터를 분석하고 단락상태의 시간 상수를 계산하여, 동기발전기의 3상 단락 조건에서 초기 과도 및 과도상태의 특성을 검증하였다.최종적으로, 이론적 공식에 의해 계산 된 동기 발전기의 파라미터는 시뮬레이션 결과와 일치하며 오차는 2 % 범위 내에 있다.

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