• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2014.06a
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• pp.53-54
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• 2014

본 논문에서는 멀티채널 오디오 재생시스템을 구성하는 라우드스피커들이 표준위치와 상이한 위치에 존재할 경우 입력된 멀티채널 오디오 신호가 표현하는 음장감을 최대한 유지하면서 주어진 라우드스피커 배치환경에 최적으로 가상음원과 멀티채널 오디오 신호를 재생하는 방법을 제안한다. 능동잡음제어 기술에 이용되는 LSM 기술을 활용하여 원음장과 스피커를 통해 재생되는 복원음장 사이의 오차를 최소화하는 음향공간필터를 설계하여 적용하였으며, 청취평가를 통하여 음장감이 유지됨을 확인하였다.

• Journal of KSNVE
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• v.11 no.1
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• pp.68-75
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• 2001

A method for actively controlling dynamic reaction forces in flexible structures subject to persistent excitations is presented. Since reaction forces are not directly measured in flexible structures, reaction forces are estimated by using the Kalman filter. The estimated reaction force is used as an error signal in the adaptive feedforward disturbance cancellation controller. In order to compensate the static effect of the truncated modes in the reaction forces, the residual flexibility matrix is used with the Kalman filter. The paper presents the formulation of the reaction forces in conjunction with the Kalman filter estimator and the adaptive feedforward controller. The results show that the dynamic reaction forces at its supports in a flexible beam test rir are well suppressed.

• Proceedings of the KIEE Conference
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• 1991.07a
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• pp.447-450
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• 1991

A novel effective calculation method of the compensation current commands of active power filter using voltage source PWM converter is proposed on the basis of the instantaneous reactive power theory. The load currents and the phase of the source voltages are used for the simplification of the calculations and the reduction of the its time. And the calculation of the currents is performed by DSP 32014 within 50 uSEC. For reducing the DC voltage and saving the costs, a passive power filters are used. The simulation results of the effects of the active power filter with a passive filter are presented.

• Proceedings of the KIPE Conference
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• 2001.12a
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• pp.198-203
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• 2001

In this paper, a new predictive control algorithm considering the parameters of series active filter has been proposed to improve the performance. By using the proposed control scheme, the current ripple drastically reduced and an improved steady state performance can be obtained. The proposed method has another advantage in the size. and cost by excluding additional passive fitters. The validity of the proposed method will be proved by the computer simulation.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.739-743
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• 2000

With significant development of power electronics technology the proliferation of nonlinear loads such as such as static power converters has deteriorated power quality in power transmission distribution systems. Notably voltage harmonics resulting from current harmonies produced by the nonlinear loads have become a serious problem in many systems Moreover momentary interruptions and voltage sags are responsible for many of the power quality problems found in typical industrial plants. Int his paper proposed 3 phase hybrid series active power filter is not only for harmonic compensation but also for harmonic isolation between supply and load and for voltage regulation and imbalance compensation Through computer simulations we have verified the effectiveness of the proposed system.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.05a
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• pp.406-408
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• 2005

In this literature, when the utility line is normal, the Off-Line UPS operates as an active power filter to compensate the reactive power from a load, and when the utility line is in outage, the On-Line UPS opuates as in single phase inverter to supply an active and reactive power to the load. An additional static switch in UPS was used to decrease an transient state during these mode changes. And the result shows that the transient state disappeared.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1074-1076
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• 1992

By using nonlinear loads in power line, reactive power and harmonics are occured. In this thesis, on the basis of the instantaneous reactive power theory, the calculation method of compensation current commands and the current control characteristics of active power filter using voltage source PWM converter are presented. The calculation of compensation current is performed by DSP within 50 usec. And the Pl control of current is performed by analog devices. The compensations of harmonic current in rectifier loads and unbalance currents are proved by experiments.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1077-1080
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• 1992

In this paper suggested methods for current control in active filter are using the triangular carriers which were composed of independently generated threefold carriers and controllable current source which compensates the harmonics generated independently from the types of the load with instantaneous amplitude adjusting from the maximum magnitude of the compensating currents. And the 2-nd order high pass passive filter connected to the source finally supplies pure sinusoidal waves by suppressing the residual harmonics which cannot removed by the active filter. As the typical load which generates the harmonics, a rectifier was set and the system was also designed by simulations and implementations.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1081-1087
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• 1992

A novel digital control algorithms are developed for an active power filter (APF) using a pulse-width modulated (PWM) rectifier with current link. A main control algorithm compensating both the reactive power and harmonic currents with fast dynamic response is derived through a vector approach. A space vector modulation technique is developed for the PWM rectifier in order to generate the desired current vector of the APF. The system generates no acoustic noise and it is implemented with a minimal control hardware structure using the Intel 80196 single-chip microcomputer. Experimental results show that the proposed scheme gives good dynamic and static performance for the APF system.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.56 no.3
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• pp.136-141
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• 2007

In this paper, a new simple control method for active power filter which can realized the complete compensation of the harmonic currents is proposed. In the proposed scheme, a compensating current reference generator employing resonance model implemented by a DSP(Digital Signal Processor) is introduced. Deadbeat control is employed to control the active power filter. The switching pulse width based SVM(Space Vector Modulation) is adopted so that the current of active power filter is been exactly equal to its reference at the next sampling instant. To compensate the computation delay of digital controller, the prediction of current is achieved by the current observer with deadbeat response.