• Title/Summary/Keyword: harmonic generation

검색결과 438건 처리시간 0.029초

Harmonic Current Compensation Using Active Power Filter Based on Model Predictive Control Technology

  • Adam, Misbawu;Chen, Yuepeng;Deng, Xiangtian
    • Journal of Power Electronics
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    • 제18권6호
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    • pp.1889-1900
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    • 2018
  • Harmonic current mitigation is vital in power distribution networks owing to the inflow of nonlinear loads, distributed generation, and renewable energy sources. The active power filter (APF) is the current electrical equipment that can dynamically compensate for harmonic distortion and eliminate asymmetrical loads. The compensation performance of an APF largely depends on the control strategy applied to the voltage source inverter (VSI). Model predictive control (MPC) has been demonstrated to be one of the effective control approaches to providing fast dynamic responses. This approach covers different types of power converters due to its several advantages, such as flexible control scheme and simple inclusion of nonlinearities and constraints within the controller design. In this study, a finite control set-MPC technique is proposed for the control of VSIs. Unlike conventional control methods, the proposed technique uses a discrete time model of the shunt APF to predict the future behavior of harmonic currents and determine the cost function so as to optimize current errors through the selection of appropriate switching states. The viability of this strategy in terms of harmonic mitigation is verified in MATLAB/Simulink. Experimental results show that MPC performs well in terms of reduced total harmonic distortion and is effective in APFs.

차단기류 오동작 분석을 위한 전원왜형장치 설계 및 개발 (Design and Development of Distorted Source Device for Circuit Breakers Failure Analysis)

  • 이상익;유재근;박종찬;최규하
    • 전력전자학회논문지
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    • 제11권5호
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    • pp.480-488
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    • 2006
  • 최근 들어 컴퓨터, 전산 및 네트워크 설비, 전력변환장치, 에너지 절약장치 등에 의한 고조파의 발생으로 인해 전기의 품질이 저하되고 OA기기, FA기기, 정보통신기기 등을 포함한 전기설비의 동작에 악영향을 미치게 된다. 지금까지 이러한 고조파 관련 연구는 진단 및 대책기술개발에 관한 연구가 주를 이루고 있고 전기를 사용하는 수용가에서 발생하는 전기사고 중 고조파에 의한 사고의 원인규명은 대부분이 추측에 의한 것이지 실험 데이터를 활용한 정확한 원인 규명은 거의 이루어지지 않고 있다. 따라서, 국내의 실정에 맞는 고조파에 의한 오동작의 원인 규명에 필수적인 실험 데이터 자료를 위한 고조파 전원 발생장치의 개발은 필수적이라 할 수 있다. 본 논문에서는 고조파로 인한 사고의 특성을 분석하기 위해 고조파를 발생하고 합성할 수 있는 5[kVA]급 전원왜형장치의 구현에 대한 제반 사항을 연구하였다.

레이저와 프라즈마와의 비선형상오작용에 관한 연구 -분광법에 의한 제 2고주파와 Brillouin 산람광의 검출- (Study on the Nonlinear Interaction of Laser with Plasma -Detection of Second Harmonic Light and Brillouin Scattering Light by Means of Spectroscopic Technique-)

  • Kang, Hyung-Boo
    • 대한전기학회논문지
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    • 제33권5호
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    • pp.173-180
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    • 1984
  • The spectra of scattering light fromlaser-produced plasma near its fundamental and second harmonic wavelength were observed respectively by means of spectroscopic technique. The experimental results and the generation mechanism of nonlinear effects such as the second garmonics and the brillouin scattering were analysed theoretically. The spectra of reflected laser light became wider than that of incident laser light. And the peak of spectrum of reflected light shifted to red-side from that of incident light. The second harmonic light is generated from the nonlinear interaction of the incident laser light and the electron plasma wave excited in resonance region by the oblique incidence of laser light to the plasma. The Brillouin backscattering from laser-produced plasmas of hydrogen and deuterium has shown an isotope effect in the red-side region of the generated second harmonic light. This isotope shift is explained by the parametric instability at the cutoff (resonance) region using frequency-and phase-matching conditions of the waves.

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