• Title/Summary/Keyword: Time varying harmonics

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Time-varying Harmonics Measurement and Evaluation of the High Speed Electric Train Loads (시간에 따라 변하는 고속철 부하의 고조파 측정 및 평가)

  • Jin, Seong-Eun;Kim, Kyung-Chul;Lee, Joo-Hong;Jeon, Young-Soo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.7
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    • pp.29-37
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    • 2006
  • High speed electric trains have nonlinear loads including converters and inverters for the control synchronous motors. Harmonics produced by these devices are large, but also have noticeable time varying characteristics. Since the large loads are supplied from the power system grid, it must be recognized that not only will the system of utility be impacted, but neighboring customer system could be impacted as well. In this paper time-varying harmonics for high speed electric train loads are measured and evaluated by international harmonic standards IEEE Std. 519 and IEC 61000-3-6 using a cumulative probablistic approach.

Detection and Tracking of Time Varying Power System Frequencies and Harmonics using Subband Adaptive Filtering (적응 부밴드 필터링을 이용한 전력계통 시변 주파수와 고조파 검출 및 추적)

  • Sohn, Sang-Wook;Choi, Hun;Bae, Hyeon-Deok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.4
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    • pp.679-687
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    • 2009
  • In this paper, a subband filtering and adaptive prediction technique for analyzing harmonics in power systems is presented. In this method, the filter banks are designed to decompose odd and even order harmonics separately. The adaptive prediction has been employed reduce the transient and white noise effect in time varying harmonics detecting and tracking. The frequencies and amplitudes of the decomposed harmonics are estimated by recursive algorithm. To demonstrate the performances of the developed technique, computer simulations to the signal with the time-varying frequency and THD are carried out.

Time-varying Harmonics Measurement and Assessment of the Electric Arc Furnace Loads (시간에 따라 변하는 전기로 부하의 고조파 측정 및 평가)

  • Kim, Kyung-Chul;Jin, Seong-Eun;Park, Sang-Young;Lee, Joo-Hong;Lee, Il-Moo;Jeon, Young-Soo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.1
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    • pp.91-99
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    • 2006
  • Large steel industries have nonlinear loads including electric arc furnaces and harmonic field measurements have shown that harmonic content of a waveform varies with time. Since the large loads are supplied from the power system grid, it must be recognized that not only will the system of utility be impacted, but neighboring customer system could be impacted as well. In this paper time-varying harmonics are evaluated by international harmonic standards IEEE Std. 519 and IEC 61000-3-6 using a cumulative probablistic approach.

A Study on the Harmonics Evaluation of Extra High Voltage Customers by Field Tests (실측에 의한 특고압 수용가의 고조파 평가에 관한 연구)

  • Kim, Kyung-Chul;Kim, You-June
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.3
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    • pp.50-55
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    • 2007
  • A large steel industry which has nonlinear loads including electric arc furnaces is one of the extra high voltage customers. These nonlinear loads generate harmonic currents and create distortions on the sinusoidal voltage of the power system. Harmonic field measurements have shown that the harmonic contents of a waveform varies with time. A cumulative propablistic approach is the most commonly used method to solve time varying harmonics. In this paper the in varying harmonics of electric arc furnace loads are evaluated by international harmonic standards(IEC 61000-3-6, IEEE 519 and JIS C 61000-3-2).

A Study on the Harmonics Effect of SVC in Electric Arc Furnace Loads

  • Kim, Kyung-Chul;Jin, Seong-Eun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.9
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    • pp.54-60
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    • 2006
  • Large steel industries have time-varying nonlinear loads such as electric arc furnaces. These nonlinear loads generate harmonic currents and create distortions on the sinusoidal voltage of the power system. The main objective of the static var compensator is to maintain the rms voltage at the point of common coupling within the limit. In this research, harmonic mitigation studies were conducted with and without the SVC, and time-varying harmonics were evaluated according to the international harmonic standards (IEC 61000-3-6 and IEEE Std. 519) using a cumulative probabilistic approach.

A Study on the Time-varying Harmonics Measurement, Assessment and Simulation of the Electric Arc Furnace Loads (시간에 따라 변하는 전기로 부하의 고조파 측정, 평가 및 시뮬레이션에 관한 연구)

  • Kim, Kyung-Chul;Jin, Seong-Eun;Lee, Joo-Hong;Jeon, Young-Soo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.5
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    • pp.9-17
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    • 2006
  • Large steel industries have nonlinear loads such as electric arc furnaces. Harmonic field measurements have shown that the harmonic contents of a waveform varies with time. Direct application of the harmonic assessment to the snapshot measurements would result in ambiguous conclusions depending on which instant is sampled. A cumulative probablistic approach is the most commonly used method to solve time-varying harmonics. Harmonic simulations are performed to evaluate the harmonic voltage and current distortions throughout the system. This paper provides an in depth analysis on harmonics field measurement of the electric arc furnace loads, harmonics assessment by the international harmonic standards IEC 61000-3-6 and IEEE Std. 519 and harmonic simulation for the time-varying harmonics. The EDSA program was used as a simulation tool for the case study.

A Study on the Time-varying Harmonics Measurement, Assessment and Simulation of the High Speed Electric Train Loads (시간에 따라 변하는 고속철 부하의 고조파 측정, 평가 및 시뮬레이션에 관한 연구)

  • Kim, Kyung-Chul;Jin, Seong-Eun;Lee, Il-Moo;Wang, Yong-Peel;Kwak, No-Hong;Jeon, Young-Soo;Park, Sang-Ho
    • Proceedings of the KIEE Conference
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    • 2006.07a
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    • pp.78-80
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    • 2006
  • High speed electric trains have nonlinear loads including converters and inverters for the control synchronous motors. Harmonic field measurements have shown that the harmonic contents of a waveform varies with time. Direct application of the harmonic assessment to the snapshot measurements would result in ambiguous conclusions depending on which instant is sampled. A cumulative probabilistic approach is the most commonly used method to solve time varying harmonics. This paper provides an in depth analysis on harmonics field measurement of the high speed electric train loads, harmonics assessment by the international harmonic standards IEC 61000-3-6 and IEEE Std. 519-1992, and harmonics simulation using EDSA program for the case study.

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Harmonics Measurement of Evaluation of KJ Road Tunnel Installations (KJ 도로터널시설물의 고조파 실측 및 평가)

  • Wang, Yong-Peel;Kim, Se-Dong;Yoo, Sang-Bong
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.10
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    • pp.87-93
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    • 2011
  • Nonlinear loads including lighting fixtures generate harmonic currents and create distortions on the sinusoidal voltage of the power system. Harmonic field measurements have shown that the harmonic contents of a waveform varies with time. A cumulative probabilistic approach is the most commonly used method to solve time varying harmonics. In this paper the time varying harmonics of lighting loads are evaluated by international harmonic standards(IEC 61000-3-6).

A Study on the Harmonics Measurement, Assessment and Simulation of the High Speed Electric Train Loads (고속철 부하의 고조파 측정, 평가 및 시뮬레이션에 관한 연구)

  • Kim, Kyung-Chul;Jin, Seong-Eun;Lee, Joo-Hong;Lee, Il-Moo;Kim, Joo-Rak
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2006.05a
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    • pp.272-277
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    • 2006
  • High speed electric trains have nonlinear loads including converters and inverters for the contol synchronous motors. Harmonic field measurements have shown that the harmonic contents of a waveform varies with time. Direct application of the harmonic assessment to the snapshot measurements would result in ambiguous conclusions depending on which instant is sampled. A cumulative probablistic approach is the most commonly used method to solve time varying harmonics. This paper provides an in depth analysis on harmonics field measurement of the high speed electric train loads, harmonics assessment by the international harmonic standards IEC 61000-3-6 and IEEE std. 519-1992, and harmonics simulation using EDSA program for the case study.

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A Study on the Harmonics and Flickers Measurement of High Speed Electric Train Loads (고속열차 부하의 고조파 및 플리커 측정에 관한 연구)

  • Kim, Kyung-Chul;Kim, You-June
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.2
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    • pp.71-77
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    • 2007
  • High speed electric trains have time-varying nonlinear loads causing voltage fluctuations to the power system. A cumulative probablistic approach is the most commonly used method to solve time varying loads. Flicker can be defined as the effect produced on the human visual perception by a changing emission of light lamps subjected to magnitude fluctuations of their supply voltage. This paper provides an in depth analysis on harmonics and flickers measurement of the high speed electric train loads. And the measurement results are evaluated by the IEC 61000-3-6 and IEC 61000-3-7.