• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.233-235
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• 2001

On the active filter converter for power factor correction is used inverter for a air-conditioner's power supply to meet IEC standard In the active filter topology for power factor correction, extra switch only control the input current indirectly to satisfied with the IEC standard for reducing the cost and size. In this paper, by dividing the input current into two different modes, the current conduction period can be widened and harmonics can largely be canceled between the two modes. Hence, the harmonics characteristics can be significantly improved, whereby the lower order harmonics, such as the fifth and seventh orders, are much reduced. The results are confirmed by theoretical and experimental implementations.

• 조명전기설비학회논문지
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• 제22권8호
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• pp.12-17
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• 2008

대부분의 수용가 부하와 전력 설비는 근본적으로 유도성이고 지상 역률로 운영되고 있다. 수용가에 캐패시터 뱅크를 적용하면 역률 개선과 무효전력 공급, 전압 상승, 전력 손실 저감과 전기요금 저감 등 많은 혜택이 있다. 또한 캐패시터 뱅크를 설치하면 고조파와 같은 전력 품질에 문제를 야기시킬 수 있다. 본 논문에서는 수용가에 설치된 캐패시터 뱅크의 역률 개선 및 고조파 저감을 심도 있게 분석한다. 사례연구 시스템은 EDSA 프로그램으로 시뮬레이션하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(2)
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• pp.787-790
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• 2004

In this paper, a novel control scheme compensating for source voltage unbalance and current harmonics and power factor correction in unified active power filter systems combined with shunt passive filters is proposed, where no low/high-pass filter are used in deriving the reference voltage for compensation. Using digital all-pass filters, the phase angle and the reference voltages compensating for harmonic current and unbalanced voltage are derived from the positive sequence component of the unbalanced voltage. The amplitude of d-axis current in a series filter is controlled as zero for power factor correction. The validity of the proposed control scheme has been verified by experimental results.

• Journal of Advanced Marine Engineering and Technology
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• 제21권1호
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• pp.59-65
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• 1997

In this paper, a feedforward amplifier with error correction is designed and implemented. This amplifier is composed of operational amplifier, the performance of which is compared with that of the reference amplifier without feedforward error correction. As a result, the sec¬ondary harmonics level is improved about 10 [dB]. Therefore it is shown that the proposed feedforward amplifier network is to be adopted able for wide - band amplifiers.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1999년도 전력전자학술대회 논문집
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• pp.626-630
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• 1999

A new integrated single-stage zero current switched(ZCS) quasi-resonant converter (QRC) for the power factor correction(PFC) converter is introduced in this paper. The power factor correction can be achieved by the discontinuous conduction mode(DCM) operation of an input current. The proposed converter has the characteristics of the good power factor, low line current harmonics, and tight output regulation. Furthermore, the ringing effect due to the output capacitance of the main switch can be eliminated by use of active clamp circuit.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 전력전자학술대회 논문집
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• pp.438-443
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• 1998

A simple single-stage AC/DC forward converter with transformer magnetic energy feedback technique for power factor correction is proposed. The operational principle of the proposed converter is presented. The proposed converter gives the good power factor correction, low line current harmonic distortions, and tight output voltage regulation. The prototype shows high power factor with low line current harmonics.

• 전자공학회논문지S
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• 제34S권10호
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• pp.151-157
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• 1997

Switched relutance motor(SRM) has the advantages of simple structure, low rotor intertia, and high power rate per unit volume. However, SRM has the disadvantages of high current harmonics, and low power factor because of the discontinuous excitation of pulse type. The harmonics brings about the distortion and loss of power system, and brings about the incorrect opertion of electronic system. This paper investigates the SRM drive system with the reduced harmonics and improved power factor. The system consists of the switching power converter with poewr factor correction(SPC-PFC), DC/DC converter and 3-phase inverter. The performances in the proposed system are verified through the simpuation and experiment.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.1120-1122
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• 2002

Switching power supply are widely used in many industrial field. Power factor improvement and harmonic reduction technique is very important in switching power supply. The power factor correction (PFC) circuit using boost converter used in input of power source is studied in this paper. It is analyzed distortional situations and harmonics of input currents that presented at continuous conduction mode(CCM) of boost PFC circuit. It is done simulations of harmonics distribution according to load variation by using PSPICE and MATLAB. From the actual experiment of boost PFC circuit the validity of the analysis is confirmed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 A
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• pp.306-308
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• 1996

The demands of minimizing the reactive power and reducing the current harmonics are increasing nowdays. The inverter airconditioner needs high inductive power and it operates with wide load ranges. Conventionally, an huge LC passive filter is used in airconditioner to improve the power factor and to reduce current harmonics which doesn't give good results. In this paper, a design of active power factor correction(APFC)circuit for inverter airconditioner is described. To improve the P.F and reduce the current THD, average current controlled APFC is designed and tested. The problems of APFC implementation, their solution and testing results are described.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제55권5호
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• pp.258-264
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• 2006

This paper presents an integrative control scheme for series-type active power filters combined with shunt passive filters not only to compensate for the source voltage unbalance and current harmonics but also to correct the power factor. To reduce the power capacity of the active filters, passive filters are connected in parallel. Diode rectifiers are replaced by the PWM converters in order to feed the real power back to the source. Power factor control is performed by changing the phase of the load voltage so that the phase of the source current coincides with that of the source voltage. The resultant voltage reference is the addition of the voltage component compensating for the source voltage unbalance and harmonic currents and the voltage component correcting the power factor. The validity of the proposed algorithm has been verified by experimental results.