• 제목/요약/키워드: linear phase

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3상 4선식 저압 배전선로에서 선형 및 비선형 부하의 사용시 전압 불평형률 비교 분석 (Comparative Analysis of Voltage Unbalance Factor on the use of Linear and Non-linear loads in Three-phase Four-wire Low Voltage Distribution Line)

  • 김종겸;김지명
    • 전기학회논문지
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    • 제66권3호
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    • pp.587-592
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    • 2017
  • In the three-phase four-wire low-voltage power distribution equipment, single-phase and three-phase load have been used mainly mixed. Also linear and nonlinear loads have been used together in the same conditions. In a three-phase four-wire distribution line, the current distribution of three-phase linear load is almost constant in each phase during driving or stopping, but the single-phase load is different from each other for each phase in accordance with the operation and stop. So that the voltage unbalance is caused by the current difference of each phase. In the three-phase four-wire distribution system, non-linear load is used with linear load. The presence of single-phase nonlinear loads can produce an increase in harmonic currents in three-phase and neutral line. It can also cause voltage unbalance. In the present study, we analyzed for the voltage unbalance fluctuations by the operation pattern of the single and three-phase linear and non-linear load in three-phase four-wire low voltage distribution system.

선형 및 비선형 부하 사용시 전류 및 부하불평형률에 대한 연구 (A Study on the Current & Load Unbalance Factor in using Linear & Nonlinear Load)

  • 김종겸;김지명
    • 전기학회논문지
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    • 제66권8호
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    • pp.1291-1296
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    • 2017
  • Single-phase and three-phase load can be used together in 3-phase 4-wire system. Single-phase and three-phase loads can be classified as linear loads without harmonics and nonlinear with harmonics. Single-phase linear loads are linear loads such as lamps and heat, and single-phase nonlinear loads are power converters such as rectifiers. It is recommended that the distribution of loads in the 3-phase, 4-wire distribution lines be evenly distributed within a certain range. However, harmonic currents generated in a nonlinear load flow on the neutral line and affect the phase current magnitude. The difference in the magnitude of the individual phase current due to the influence of the harmonic current present in the neutral line can produce a difference in current and load unbalance. In this study, current unbalance ratio and load unbalance ratio which can occur when a combination of linear and nonlinear loads are applied to 3-phase 4-wire distribution line are calculated.

Interactive Fuzzy Linear Programming with Two-Phase Approach

  • Lee Jong-Hwan
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • 제6권3호
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    • pp.232-239
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    • 2006
  • This paper is for applying interactive fuzzy linear programming for the problem of product mix planning, which is one of the aggregate planning problem. We developed a modified algorithm, which has two-phase approach for interactive fuzzy linear programming to get a better solution. Adding two-phase method, we expect to obtain not only the highest membership degree, but also a better utilization of each constrained resource.

적응 신호 처리를 위한 고속 선형 위상 FIR 필터 (Fast linear-phase FIR filter for adaptive signal processing)

  • 최승진;이철희;양홍석
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1988년도 한국자동제어학술회의논문집(국내학술편); 한국전력공사연수원, 서울; 21-22 Oct. 1988
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    • pp.172-177
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    • 1988
  • In this paper, a new fast algorithm of FIR least squares filter with linear phase is presented. The general unknown statistics case is considered, whereby only sample records of the data are available. Taking advantage of the near-to-Toeplitz+Hankel structure of the resulting normal equation, a fast algorithm which gurantees the linear phase constraint, is developed that recursively produces the filter coefficient of linear phase FIR filter for a single block of data.

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다중적분기 사용 +1, 0, -1 계수의 선형위상 FIR 필터의 설계 (FIR Linear Phase Filter Design Using Coefficients +1,0.-1 and Multiple Integrator)

  • Kim, Hyung-Myung
    • 대한전자공학회논문지
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    • 제26권12호
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    • pp.2046-2054
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    • 1989
  • Improved algorithms are presented to design linear phase digital FIR filters with coefficients of +1,0,-1 only followed by a multiple integrator. It has been shown that the existing linear phase filter design concept for the single integrator(or, accumulator)case can be extended to the case of the multiple integrator. Linear phase conditions for the multiple integrators are summarized. Filter design methods with double or triple integrator are exploited in datail and its computer simulation results are presented to deduce the advantages of multiple integrator to the single integrator.

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단상 Linear Induction Motor의 개발연구 (A Study on the Development of Single-phase Linear Induction Motor)

  • 임달호
    • 전기의세계
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    • 제26권5호
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    • pp.65-73
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    • 1977
  • This paper work treats with the basic characteristics to be investigated in development of a single-phase linear induction motor. The results of this research work have established some important characteristics which should be taken into consideration in the design and construction of this linear motor, And it is also proven that the development of high-voltage linear machine with large capacity is possible.

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Coordinated Control of an Independent Multi-phase Permanent Magnet-type Transverse Flux Linear Machine Based on Magnetic Levitation

  • Hwang, Seon-Hwan;Kwon, Soon-Kurl;Hwang, Young-Gi;Bang, Deok-Je
    • 조명전기설비학회논문지
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    • 제28권12호
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    • pp.95-102
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    • 2014
  • This paper proposes a coordinated control for an independent multi-phase transverse flux linear synchronous motor (IM-TFLSM) based on magnetic levitation. The stator structures of the IM-TFLSM are composed of a two set, which has independent three-phase windings and a double-sided air-gap as opposed to the conventional Y-connected three-phase linear motors. A suitable control algorithm is necessary to operate the applied linear machine. This study proposes a coordinated control algorithm for adjusting the mover air-gap and thrust force of the IM-TFLSM in order to maintain air-gap and phase shifted current control of the independent 3-phase modules. In addition, the principle of operation and its special structures are described in detail and the validity and effectiveness of the control algorithm is verified through multiple experimental results.

리니어 펄스모터의 고정자 상권선 적층에 따른 추력 리플 저감 기법 연구 (Reducing the Thrust Ripple Generated by the Stacking of Stator Phase Windings of a Linear Pulse Motor)

  • 최재혁;전찬용;목형수
    • 전기학회논문지
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    • 제66권2호
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    • pp.447-452
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    • 2017
  • The stator phase winding of a linear pulse motor, which is a new type of linear motor, is comprised of two phases and is structurally characterized by a stacking method in which the winding of one phase is laid on top of the winding of another phase. Such a structural characteristic induces a difference in the flux linkage resulting from the flux of each stator phase winding in the same condition. The difference in the induced flux linkage acts as a kind of thrust ripple component in terms of the generated thrust. Thus, in order to maintain consistent thrust force, a method is required to solve the problem caused by the structural singularity. Hence, in this study, we present a technique for reducing the thrust force ripple generated by the stacking of the stator phase windings of a linear pulse motor through the generation of a compensating current reference value of the current controller in order to keep the torque constant. The proposed compensating algorithm is validated by simulations and experimental results.

고속순차 최소자승법에 의한 선형위상 유한응답 여파기의 설계 (Fast Sequential Least Squares Design of FIR Filters with Linear Phase)

  • 선우종성
    • 한국음향학회:학술대회논문집
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    • 한국음향학회 1987년도 학술발표회 논문집
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    • pp.79-81
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    • 1987
  • In this paper we propose a fast adaptive least squares algorithm for linear phase FIR filters. The algorithm requires 10m multiplications per data point where m is the filter order. Both linear phase cases with constant phase delay and constant group delay are examined. Simulation results demonstrate that the proeposed algorithm is superior to the LMS gradient algorithm and the averaging scheme used for the modified fast Kalman algorithm.

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선형 위상 신호를 이용한 위상속도 측정에 관한 연구 (A Study on Phase Velocity Measurement using Linear Phase Signal)

  • 고덕영;김계국;이종악
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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    • pp.51-54
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    • 1988
  • In this paper, Digital signal processing method is deserved by the tissue characteristic quantization. Linear phase velocity is studied using linear signal, and the slope which attenuation characteristics are decreased is analysed according to frequency increase. A more efficient method determining the minimum phase function is developed from the spectral magnitud function.

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