• Title/Summary/Keyword: synchronous generator

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A Speed and Power Control of DFIG Using the Exciting Frequency for Wind Power Generating (풍력발전용 권선형 유도발전기의 회전자 여자주파수를 이용한 속도와 출력제어)

  • Lee, U-Seok;O, Cheol-Su
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.48 no.7
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    • pp.349-356
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    • 1999
  • Wide operating range and speed control is needed for wind power generating and a Doubly Fed Induction Generator(DFIG) has good adaptivity for that purpose. This paper deals with the speed and power control using the Grid connected DFIG in the super-synchronous speed regions, by controlling frequency and voltage fed to the rotor. Power flow of the DFIG and steady-state algebraic equations of the equivalent circuit are analyzed. For the speed control analysis, torque simulation is performed whereby the different slip between operating motor driving frequency and synchronous frequency of M-G system applied. To keep the output rating of the generator, the exciting frequency and voltage attenuation are applied.

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An Operating Characteristics of Surface Permanent Magnetic Synchronous Generator for 5-Phase 5kW (5상 5kW 표면부착형 영구자석 동기발전기 운전특성)

  • Jung, Hyung-Woo;Kim, Min-Huei;Song, Hyun-Jik;Kim, Dong-Hee
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.6
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    • pp.9-16
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    • 2013
  • This paper presents an operating characteristics of the 5-phase 5kW with developed the surface permanent magnetic synchronous generato (SPMSG) in order to make a study of a polyphase ac motors keeping hold of more advantages. There are shown a amplitude and waveform of the generated electromotive force, in FFT analysis of harmonics, within output voltages, and reviewing a experiment results in no-load test, resistive load, and inductive load using 5-phase induction motor by variable output frequency. The operating characteristics of the developed manufacturing generator include voltage regulation, efficiency, power factor, THD, and so on at rated load.

Direct Instantaneous Voltage Control Strategy for Synchronous Generator Excitation System (동기발전기 여자시스템 제어를 위한 직접순시전압제어기법)

  • Lee, Sang-Hun;Kim, Tae-Hyoung;Lee, Dong-Hee;Ahn, Jin-Woo
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.05a
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    • pp.218-223
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    • 2007
  • This paper presents a simple, robust excitation control system for synchronous generator using direct instantaneous voltage control(DIVC) method. The proposed DIVC excitation system can operate as high dynamics of power conversion system without any control gains such as Pill controller. And the transient overshoot of generator voltage can be suppressed with a simple time constant. For the continuous control of excitation system, the fast IGBT inverter system is used in this paper for exciter's field control. The proposed control scheme is verified by the computer simulations and experimental results in the prototype generation system.

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Operating Characteristics of High Speed PM Synchronous Generator for Microturbine (마이크로터빈용 고속 영구자석 동기발전기 운전 특성)

  • Ahn J. B.;Jeong Y. H.;Kang D. H.
    • Proceedings of the KIPE Conference
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    • 2004.07a
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    • pp.141-143
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    • 2004
  • Distributed generation(DG) using microturbine will be adopted widely because of its various usages and merits such as high heat efficiency, environmental-friendliness. Commercialized DG using microtubine that rotates up to $60,000\~100,000[rpm]$ converters mechanical power to electricity by permanent magnet synchronous machine. This paper presents comparative test and simulation results of PMSM as generator. Test was done by diode rectifier and inverter. Parameters used in the simulation are driven from FEM analysis. Under various speed and load conditions, V-I characteristics matches well and it suggests the possibility of high speed PMSM as generator. DG operating at stand alone and grid connection mode will be developed.

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High Performance Control of Digital Excitation System for Synchronous Generator (동기발전기용 디지털 여자시스템 고성능 제어)

  • Seo M. S.;Ryu D. K.;Kim L. H.;Kim J. H.;Won C. Y.;Bae K. H.
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.763-768
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    • 2002
  • In this paper digitally based excitation systems for the synchronous brushless generators are presented. System configuration, control functions with their structure functions are also shown. The control system has two feedback loops: main one based on a generator's voltage with digital controller and inner one based on excitation voltage of the exciter with analog controller. Usually the generator regulation of voltage Is made with transducers for the voltage measurement. This paper shows technique of measuring the voltage without harmonics affect, using Park's equation transformation.

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Direct Power Control of PMa-SynRG with Back-to-back PWM Voltage-fed Drive

  • Baek, Jeihoon;Kwak, Sangshin
    • Journal of Electrical Engineering and Technology
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    • v.13 no.2
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    • pp.761-768
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    • 2018
  • In this paper, the performance analysis of a control topology based on the direct output power control (DPC) for robust and inexpensive permanent magnet-assisted synchronous reluctance generator (PMa-SynRG) system is presented. The PMa-SynRG might be coupled to an internal combustion engine running at variable speed. A three-phase PWM rectifier rectifies the generator output and supplies the dc link. A single-phase PWM inverter supplies constant ac voltage at constant frequency to the grid. The overall control algorithm is implemented on a TMS320F2812 digital signal processor board. Simulations results and experimental results verify the operation of the proposed system.

Development of EMTDC Classical Generator Model Considering Reactive Power Control (무효전력제어를 고려한 EMTDC Classical Generator 모델개발)

  • Lee, Seung-Ryul;Yoon, Jae-Young;Choi, Heung-Kwan;Kim, Jong-Yul
    • Proceedings of the KIEE Conference
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    • 2003.07a
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    • pp.101-103
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    • 2003
  • In power system, the study on synchronous generators is an important issue. Among the studies, reactive power control of synchronous generators is very important from the viewpoint of power system stability. In this study, we develope a classical generator model and a power factor regulation model applying a simple algorithm in order to control reactive power generation, using EMTDC.

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Thyristor-Based Resonant Current Controlled Switched Reluctance Generator for Distributed Generation

  • Emadi Ali;Patel Yogesh P.;Fahimi Babak
    • Journal of Electrical Engineering and Technology
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    • v.2 no.1
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    • pp.68-80
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    • 2007
  • This paper covers switched reluctance generator (SRG) and its comparison with induction and synchronous machines for distributed generation. The SRG is simple in design, robust in construction, and fault tolerant in operation; it can also withstand very high temperatures. However, the performance and cost of the SRG power electronics driver are highly affected by the topology and design of the converter. IGBT and MOSFET based converters are not suitable for very high power applications. This paper presents thyristor-based resonant converters which are superior candidates for very high power applications. Operations of the converters are analyzed and their characteristics and dynamics are determined in terms of the system parameters. The resonant converters are capable of handling high currents and voltages; these converters are highly efficient and reliable as well. Therefore, they are suitable for high power applications in the range of 1MW or larger for distributed generation.

Fault Detection of Synchronous Generator using Wavelet Transform (웨이브릿 변환에 의한 동기발전기의 고장검출)

  • Park, Chul-Won;Shin, Myong-Chul
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.640-641
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    • 2007
  • In this paper, the discrete wavelet transform (DWT) was applied a fault detection of a synchronous generator being superior to a transient state signal analysis and being easy to real time realization. The fault signals after executing a terminal fault modeling collect using a MATLAB package, and calculate the wavelet coefficients through the process of a multi-level decomposition (MLD). The proposed algorithm of a fault detection of a generator using Daubechies WT (wavelet transform) was executed with a C language for the commend line function and for the real time realization after analyzing MATLAB's graphical interface.

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Fuzzy Control Strategy for Damping Sub-Synchronous Resonance

  • Qader, M.R.
    • Journal of Electrical Engineering and Technology
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    • v.13 no.5
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    • pp.1791-1797
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    • 2018
  • Sub-Synchronous Resonance (SSR) is a phenomenon that harms turbine generator shafts because the phenomenon induces sub-synchronous wavering in the system. In the study presented in this paper, a dynamic resistance bank is used to mitigate the occurrence of sub-synchronous phenomenon. A fuzzy logic controller using rotor speed deviation and its derivative as inputs is implemented to damp sub-synchronous oscillations more efficiently. An eigenvalue technique is used to analyse the stability of the system, and a simulation in MATLAB is conducted, based on the IEEE Second Benchmark, to validate the effectiveness of the proposed method under a 3-phase fault condition at an infinite bus. The time-domain simulation and eigenvalues are used to observe the proposed method's superior ability to damp sub-synchronous oscillation.