• Title/Summary/Keyword: harmonic filter

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A Proposal of Compact Passive Harmonic Filter for ac Motor Drive (고성능 콤팩트형 AC모터드라이브 고조파 필터 제안)

  • Park, Byung-Ju;Yoon, Dong-Chul;Oh, Jeong-Cheol;Bae, Byung-Yeol;Hwang, An-Il;Yoo, Hang-Kyu;Choi, Seok-Keun
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.67 no.4
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    • pp.191-199
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    • 2018
  • The harmonic reduction method of ac motor drive, ACL and DCL were commonly used, but the current distortion ratio was only 35%, thus the several different types of filters as BBHF(broad band harmonic filter), HHF(hybrid harmonic filter), NHHF(new hybrid harmonic filter) have been developed to satisfy the IEEE Std. 519 harmonic limitation. However, these filters had been limited marketability due to cost and size problems. This study suggests the methods to reduce cost and size of the harmonic filter including topologies, besides we discussed simulation results of the power system with regard to the implementation and performance of the filters.

Speaker Separation Based on Directional Filter and Harmonic Filter (Directional Filter와 Harmonic Filter 기반 화자 분리)

  • Baek, Seung-Eun;Kim, Jin-Young;Na, Seung-You;Choi, Seung-Ho
    • Speech Sciences
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    • v.12 no.3
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    • pp.125-136
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    • 2005
  • Automatic speech recognition is much more difficult in real world. Speech recognition according to SIR (Signal to Interface Ratio) is difficult in situations in which noise of surrounding environment and multi-speaker exists. Therefore, study on main speaker's voice extractions a very important field in speech signal processing in binaural sound. In this paper, we used directional filter and harmonic filter among other existing methods to extract the main speaker's information in binaural sound. The main speaker's voice was extracted using directional filter, and other remaining speaker's information was removed using harmonic filter through main speaker's pitch detection. As a result, voice of the main speaker was enhanced.

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Analysis and Design of a Passive Harmonic Filter for a Three-Phase Rectifier (3상 정류기부하에 대한 수동 고조파필터의 해석 및 설계)

  • Cho, Young-Sik;Cha, Han-Ju
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.58 no.3
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    • pp.316-322
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    • 2009
  • This paper presents an analytical design method of a passive harmonic filter for a three-phase diode rectifier and uses a new transfer function approach in the analysis and design. The transfer function approach derives an analytical formulation of an utility system including passive filters with a basis of Laplace transform and provides a graphical formulation so that a visualized insight into an interaction between individual filter and system response can be attainted. Harmonic impedance, voltage division and current division transfer function are used as a design tool, which makes a calculated filter parameters to satisfy IEEE-519 distortion limits. A simple five-step design procedure is introduced in the filter design, which consists of system analysis, selection of PCC(Point of Common Coupling), filter specification calculation, appropriate filter design for system and filter implementation. Philosophy governing the design procedure is based on a numerical/graphical iterative solution, trial and error with visualization feed-back based on "algebra on the graph". Finally, performance of the designed passive harmonic filter is verified by experiment and shows that 5th, 7th, 9th, 11th and 13th harmonics are decreased within IEEE-519 distortion limits, respectively.

A Study on Tuning Factor(δ) and Quality Factor(Q) Values in Design of Single-Tuned Passive Harmonic Filters (단일동조 수동고조파필터 설계시의 동조계수(δ) 및 양호도(Q)값 연구)

  • Cho, Young-Sik;Cha, Han-Ju
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.59 no.1
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    • pp.64-70
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    • 2010
  • This paper presents how to decide on tuning factor(${\delta}$) and quality factor(Q) values in design of single-tuned passive harmonic filters. Tuning factor(${\delta}$) and quality factor(Q) values have to consider before decision on circuit parameters of passive filters. A Study on these two value has not been scarcely performed and only experienced values has been used in passive harmonic filter design by far. As a experienced value, in cases of 5th and 7th filter, tuning factor(${\delta}$) is about 0.94 and 0.96 respectively and quality factor(Q) is, in all cases of, 50. If Single-tuned passive harmonic filter will be off-tuned, performance of filter will be decreased steeply and occur to parallel resonance between system reactance and filter capacitance. Therefore During the operation, In order not to off-tuning, Filter must be tuned at former order than actual tuning order. This is the same that total impedance of filter must have a reactive impedance. In this paper, Tuning factor(${\delta}$) is decided via example of real system and using the bode-plot and then performance of filters confirmed by filter current absorbtion rate. And Quality factor(Q) decided using the bode plot in example system and then performance of filters confirmed by filter current absorbtion rate also, which makes a calculated filter parameters to satisfy IEEE-519 distortion limits. Finally, Performance of the designed passive harmonic filter using the tuning factor(${\delta}$) and quality factor(Q) values, decided in this paper is verified by experiment and shows that 5th, 7th, 9th, 11th and 13th current harmonic distortions are decreased within IEEE-519 distortion limits, respectively.

Rotation-Invariant Pattern Recognition of the Multiple Circular Harmonic Filter Using Proper Center (적정의 중심점을 이용한 다중 원형 고조 필터의 회전 불변적 형태 인식)

  • 김종찬;도양회;김수중
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.27 no.1
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    • pp.130-136
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    • 1990
  • For the rotation-invariant pattern recognition, we propose multiple circular harmonic filter which is expanded about the proper center. The proper centerm when input image is given, is the circular harmonic expansion center of the filter which yields a maximum center correlation peak in the output plane. In this paper, we founded the circular harmonic components that the proper center superposes on the same position and then designed multiple circular harmonic filter using these components. Also the proposed filter is compared with conventional multiple circular harmonic filter and shows that it can maximize the center correlation peak for the rotated input image by the computer simulation.

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A Study on Probabilistic Harmonic Filter Design (확률론적 고조파필터 설계에 관한 연구)

  • Kim, Y.H.;Lee, Buhm;Choi, S.K.;Lee, S.J.;Lee, M.M.;Na, I.K.;Lee, K.S.;Choi, Y.J.
    • Proceedings of the KIEE Conference
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    • 2005.07a
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    • pp.465-467
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    • 2005
  • Filter design for harmonic reduction suggests that measurement from IEEE std-519 and IEEE-61000 standards for 1 year designs filter about the worst case, filter design about method applied probability from IEEE std-519 standard suggests the basic alternative. At filter design method applied to temporary occurred harmonic maximum, analyzed into closely harmonic that applied to probability develops that ignorable harmonic that lowers temporary occurred probability is rational and economic filter design in detailed method.

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Versatile Shunt Hybrid Power Filter to Simultaneously Compensate Harmonic Currents and Reactive Power

  • Trinh, Quoc-Nam;Lee, Hong-Hee
    • Journal of Electrical Engineering and Technology
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    • v.10 no.3
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    • pp.1311-1318
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    • 2015
  • This paper introduces a novel topology and an effective control strategy for a shunt hybrid power filter (SHPF) to simultaneously compensate harmonic currents and reactive power. The proposed SHPF topology is composed of an LC passive filter tuned to the 7th harmonic frequency and a small-rated active filter connected in parallel with the inductor Lpf of the LC passive filter. Together with the SHPF topology, we also propose a control strategy, which consists of a proportional-integral (PI) controller for DC-link voltage regulation and a PI plus repetitive current controller, in order to compensate both the harmonic current and the reactive power without the need for additional hardware. Thanks to the effectiveness of the proposed control scheme, the supply current is sufficiently compensated to be sinusoidal and in-phase with the supply voltage, regardless of the distorted and phase lagging of the load current. The effectiveness of the proposed SHPF topology and control strategy is verified by simulated and experimental results.

Development of a Novel Passive Harmonic Filter (신개념 수동형 고조파 필터 개발과 성능에 관한 평가)

  • Park, Byoung-Ju;Lee, Han-Sang;Jang, Gil-Soo
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.55 no.1
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    • pp.29-36
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    • 2006
  • The interest for harmonic problems has been increasing due to the increment of nonlinear loads. The loads such as DC power system, personal computers, UPS system, inverters and converters operate as harmonic current sources. In this paper, a new type of the passive filter, Hybrid Harmonic Filter (HHF) is suggested to mitigate harmonic problems in power systems. The HHF is developed for reducing harmonic current, especially on the system that includes 6-pulse bridge rectifiers. Also, it is expected to prevent the overheating of transformers and feeders due to overcurrent and to correct the power factor.

AC harmonic elimination and reactive power compensation by voltage-type active filter (전압형 능동필터에 의한 교류고조파제거와 무효전력보상)

  • 김한성;최규하;신우석;이제필
    • 제어로봇시스템학회:학술대회논문집
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    • 1988.10a
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    • pp.688-692
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    • 1988
  • The active filter system for harmonic current compensation is presented in this paper. The active filter, composed of a three-phase voltage-type PWM inverter and the capacitor, compensates both the harmonic currents and the reactive power by injecting the PWM current to the ac line. This paper describes the principle of harmonic current compensation, the calculation circuits for the harmonic currents to be injected, the several compensation characteristics. Also the experimental results are shown to verify the theory proposed in this paper.

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Harmonic Analysis of Reactor and Capacitor in Single-tuned Harmonic Filter Application

  • Kim, Jong-Gyeum;Park, Young-Jeen;Lee, Dong-Ju
    • Journal of Electrical Engineering and Technology
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    • v.6 no.2
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    • pp.239-244
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    • 2011
  • Industrial power distribution system includes many kinds of non-linear loads, which produce the harmonics during energy conversion transition. The single-tuned passive filter is widely used to absorb the harmonics and attenuate its undesirable effect in the distribution system. However, the passive filter might be severely stressed, and sometimes even damaged, due to the absorption of harmonics. There is voltage rise on the capacitor when the single-turned harmonic filter is applied. When the capacitor voltage rose above the allowable limit, the expected life of the capacitor will considerably deteriorate. On the other hand, the reactor can experience the spike voltage even if the voltage and current of the capacitor are within the allowable limit, and this accumulated voltage stress of the reactor causes its premature fault. In this paper, we analyzed and compared the harmonic voltage and current of the reactor and capacitor in a single-tuned harmonic filter through the EMTP software and verified them with the experimental results.