• 전력전자학회논문지
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• 제13권5호
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• pp.352-359
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• 2008

본 논문에서는 왜곡된 전원전압 하에서 삼상 PWM 컨버터의 전류 보상 기법을 제안하였다. PWM 컨버터의 제어에 있어서 전원단 전압의 정확한 위상각 정보는 필수적이다. 동기좌표계 PLL 기법을 이용하여 고조파 전압이 포함되어 있는 전원단의 위상각을 검출하는 경우 전원 전압의 고조파로 인해 왜곡된 위상각을 얻게 된다. 이러한 왜곡된 위상각으로 컨버터를 제어하는 경우 입력 전류는 순수 정현파가 되지 않고 고조파가 포함된다. 본 논문에서는 왜곡된 전원단 전압 조건에 대해서도 입력 전류의 고조파를 IEEE Std. 519 규정인 5% 이내로 제한할 수 있도록 하는 전류 보상기법을 제안하였다. 시뮬레이션과 실험을 통하여 제안된 기법의 타당성을 검증하였다.

• 전기학회논문지P
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• 제67권1호
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• pp.1-8
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• 2018

ACL and DCL are have been conventionally used for reducing harmonic current on the input side of an ACMD. The current distortion ratio ITHD using ACL and DCL is only 35% to 85%, therefore to satisfy the IEEE Std. 519 requirements, the line filters has been focused as an alternative means. Those are installed between the AC power supply and the input of the ACMD, and must meet the IEEE Std. 519, be economical and be compact. To contribute to the widespread of using these line filters, we discussed concerning its topologies, simulation results, prototype test results as well as the cost evaluations. It included not only the proposed (NHHF) new hybrid harmonic filters which have both merits of simplicity and economic but also the past (BBHF) broadband harmonic filters and (HHF) hybrid harmonic filters.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2009년도 춘계학술발표논문집
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• pp.411-414
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• 2009

본 논문에서는 PSCAD 시뮬레이션을 이용하여 실계통도와 유사한 배전계통 분산전원 연계 시스템을 모델링하였다. 모델링한 계통도의 연계지점에 따른 THD와 TDD를 시뮬레이션하고, 고조파 연계기준(IEEE Std 1547와 IEEE Std 519)을 적용하여 기존의 전력계통에 태양광발전 시스템 연계시 발생되는 고조파를 평가하였고 평가결과를 분석하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 추계학술대회 논문집
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• pp.109-110
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• 2012

본 논문에서는 불평형 전원 전압 하에서 삼상 PWM 컨버터의 전류 보상 기법을 제안하였다. 전원 전압이 불평형인 경우 PLL(Phase Locked Loop)를 이용하여 추출한 위상각에는 왜곡 성분이 포함된다. 이러한 왜곡된 위상각으로 컨버터를 제어하는 경우 입력 전류에도 고조파가 포함되게 된다. 본 논문에서는 불평형 전원 전압 하에서도 입력 전류의 THD(Total Harmonic Distortion)를 IEEE Std. 519 규정인 5% 이내로 제한할 수 있도록 하는 전류 보상 기법을 제안하였다. 제안된 기법은 시뮬레이션을 통해 그 타당성을 검증하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 C
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• pp.1885-1887
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• 2004

This paper presents the aspect and distribution of voltage and current harmonics being made at low voltage power systems. The voltage and current harmonics in power systems supplying various loads were monitored and analyzed. We have examined the results compared to advanced countries' harmonics control standards. As a result, the current harmonics were significantly greater than the voltage harmonics. In particular, the harmonics of currents flowing through loads with power switching electronics was pronounced. Also, the contents of current harmonics of street lamp circuits was about 30%, and it was decreased to 12.3% with the installation of scries reactor. On the whole, The measured results of voltage and current harmonics exceeds the regulation limits recommended by IEEE std 519-1992.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2004년도 학술대회 논문집
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• pp.121-127
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• 2004

Electric ballast is widely used to turn on the fluorescent. Electric ballast measure occurrence of harmonic through the actual measurement and it is simulated by modeling equivalent circuit for harmonic analysis. The purpose of this paper is to give an equivalent circuit modeling methodology for the harmonic currents generated by single-phase personal computer loads to evaluate a commercially available series resonant filter for the harmonic currents compensation based on the IEC std 61000-3-2 and IEEE 519 standards for limiting harmonic distortion.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2002년도 학술대회논문집
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• pp.319-324
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• 2002

This paper describes analysis of power quality in distribute network system. EDSA is used for simulations to the teal model system. Harmonic load flow, harmonic frequency scan studies, distortion levels, and filter design method. Through this paper, minimized injected harmonic by computating the capacitor of optimal filter satisfied with IEEE Std-519 applying to distribute system are analysed through detailed simulation.

• 산업기술연구
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• 제31권B호
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• pp.75-79
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• 2011

In this paper a new PFC Controller for 3-Phase Modular UPS(Uninterruptible Power Supplies) is proposed. The PFC circuit for 3-Phase Modular UPS is implemented using three 1-phase 3-level boost PFC circuits. To control DC output voltage, single voltage controller considering imbalance of two capacitor voltages and to regulate AC input current three independent current controllers are used in proposed PFC controller. By the proposed method, without additional hardware, THD(Total Harmonic Distortion) of input currents can be readily limited below 5% which is the harmonic current requirements by IEEE std. 519. Its validity is verified by simulations and experiments.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2006년도 춘계학술대회 논문집
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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.

• Journal of Power Electronics
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• 제10권4호
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• pp.428-433
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• 2010

This paper proposes a harmonics reduction technique for the input currents of three phase PWM converters. The quality of the phase angle information on the utility voltage connected to the PWM converters affects their control performance. Under a distorted utility voltage, the extracted phase angle based on the synchronous reference frame PLL method is distorted. This causes large harmonics in the input currents of a PWM converter. In this paper, a harmonics reduction method that makes the input currents in the PWM converter sinusoidal even under distorted utility conditions is proposed. By the proposed method, without additional hardware, the THD (Total Harmonic Distortion) of the input currents can be readily limited to below 5% which is the harmonic current requirements of IEEE std. 519. Its validity is verified by simulations and experimental results.