• Title, Summary, Keyword: Synchronous

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Synchronous Control of a Two-Axes Driving System by Disturbance Observer (외란 관측기를 이용한 2축 구동 시스템의 동기제어)

  • Byeon, Jeong-Hwan;Yeo, Dong-Jun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.2
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    • pp.242-249
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    • 2001
  • In this study, a methodology of synchronous control has been developed that can is applied to position synchronization of a two-axes driving system such as overhead crane. The synchronous error is caused by model uncertainties and torque load at each axis. To overcome these problems, the synchronous control system has been composed of two disturbance observers to calculate the torque disturbance and one synchronous controller to eliminate synchronous error. By considering model uncertainties of each axis, the synchronous controller has been designed using H(sub)$\infty$ control theory. The effectiveness of the proposed method has been verified through simulation.

Precise Position Synchronous Control of Four-Axes System Based on Acceleration Control (가속도제어에 의한 4축 시스템의 정밀 위치동기제어)

  • Jeong, Seok-Kwon;Choi, Bong-Seok;You, Sam-Sang
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.9
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    • pp.1245-1254
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    • 2004
  • In this paper, we deal with a precise position synchronous control of four-axes system which is working under various load disturbances. Each axis driving system is consisted of a speed controller and an acceleration controller as an inner loop instead of conventional current control scheme. The acceleration control plays an important roll to suppress load disturbances quickly. Also, each axis is coupled by a maximum position synchronous error comparison to minimize position synchronous errors according to integration of speed differency. As a result, the proposed system enables precise synchronous control with good robustness against load disturbances during transient as well as steady state. The stability and robustness of the proposed system are investigated through its frequency characteristic and numerical simulations. Finally, experimental results under load disturbances demonstrate the effectiveness of the proposed control system fur four-axes position synchronous control.

SDH network conversion system design for wireless transmission (무선 전송을 위한 SDH 네트워크 연동장치 설계)

  • Park, Chang-Soo;Kim, Jong-Hyoun;Yoo, Ji-Ho;Yoon, Byung-Su;Kim, Su-Hwan;Byun, Hyun-Gyu
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.461-463
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    • 2018
  • In this paper, we have studied the devices needed for long distance wireless transmission of SDH network. This devices propose wireless transmission and measurement method of STM-1(basic transmission unit of SDH method) signal and 200Mbps synchronous ethernet. The synchronous clock recovery function is provided for STM-N transmission and synchronous ethernet transmission, and spare clock switching function is designed for stable synchronization. In addition, we discussed the measurement method of STM-N and synchronous Etherent communication method in wireless transmission section.

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Fuzzy Control Strategy for Damping Sub-Synchronous Resonance

  • Qader, M.R.
    • Journal of Electrical Engineering and Technology
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    • v.13 no.5
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    • pp.1791-1797
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    • 2018
  • Sub-Synchronous Resonance (SSR) is a phenomenon that harms turbine generator shafts because the phenomenon induces sub-synchronous wavering in the system. In the study presented in this paper, a dynamic resistance bank is used to mitigate the occurrence of sub-synchronous phenomenon. A fuzzy logic controller using rotor speed deviation and its derivative as inputs is implemented to damp sub-synchronous oscillations more efficiently. An eigenvalue technique is used to analyse the stability of the system, and a simulation in MATLAB is conducted, based on the IEEE Second Benchmark, to validate the effectiveness of the proposed method under a 3-phase fault condition at an infinite bus. The time-domain simulation and eigenvalues are used to observe the proposed method's superior ability to damp sub-synchronous oscillation.

Position-Synchronous Control of a Rotating System by Adding Disturbance Observer to Coupling Structure (커플링구조와 외란관측기를 결합한 회전시스템의 위치동기제어)

  • 변정환
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.3
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    • pp.66-73
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    • 2003
  • In this study, a methodology of synchronous control which can be applied to position synchronization of a two-axis rotating system is developed. Based on coupling structure, the synchronous control system is composed of disturbance observer, speed and synchronous controllers. The speed controller is designed to follows speed reference. The disturbance observer is designed to restrain synchronous error. In addition, the synchronous controller is designed for a viewpoint of accurate synchronization in lead compensation law. The effectiveness of the proposed method is verified through simulation.

Study on Pulling-Into-Step of Induction Synchronous Motor (유도동기전동기의 동기화 한계에 관한 연구)

  • 박민호;홍순찬
    • 전기의세계
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    • v.24 no.2
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    • pp.78-83
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    • 1975
  • There are many studies recently, on a wound rotor induction motor operation as synchronous rotating speed, and such an induction motor is so called an induction synchronous motor. In above desciption the region of pull into-step that the wound rotor induction motor as a synchronous motor has not been calculated. This paper deals with such a region. Generally, induction synchronous motor is different from a synchronous motor in many respects. In considering these respects, characteristic equations of motion for this motor are induced adoption small signal linearization, continuous quasili-nearization and state variable grouping technique. For pulling-into-step of Induction Synchronous Motor, we first analyze these equations with digital computer and compare the former with datas calculated by motor experimentation.

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A Study on the Real Time Digital Field Time-Constant Regulator for Micro-Synchronous Machine (축소형 동기발전기 실시간 디지털 계자시정수 보상장치에 관한 연구)

  • Kim, Dong-Joon;Moon, Young-Hwan;Hwang, Chi-U
    • Proceedings of the KIEE Conference
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    • pp.253-256
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    • 1997
  • This paper describes a novel design method for compensating field time-constant of micro-synchronous machine so that its terminal flux can show the same characteristics as large-scale synchronous machine's. In addition to it, the suggested design method can determine the field time-constant regulator's parameters considered the nonlinearities of micro-synchronous machine such as saturation and loading effect. This method applied to 5kVA micro-synchronous machine, and the digital time-constant regulator with digital AVR were designed such that the short field time-constant, $T_{do}'=1.12\;sec$, can take on the large-scale synchronous machine time constant, $T_{do}'=1.47\;sec$. After determining the parameters of controllers, the real time digital time-constant regulator and digital AVR algorithm were implemented by using the PC with Penumum processor, and the usefulness of suggested real time digital time-constant regulator was verified by observing its good performance on the excitation of micro-synchronous machine.

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A Study on the Efficiency Improvement of TTFC(Two Transistor Forward Converter) using Synchronous Rectifier of Compulsory Control-driver (동기정류기 강제구동 방식을 이용한 TTFC의 효율 향상에 관한 연구)

  • Bae, Jin-Yong;Kim, Yong;Lee, Eun-Young;Kwon, Soon-Do;Han, Kyung-Tae;Han, Dae-Hee
    • Proceedings of the KIEE Conference
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    • pp.166-170
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    • 2003
  • This paper presents the TTFC(Two Transistor Forward Converter) using Synchronous Rectifier of Compulsory Control-driver. The two transistor forward circuit is used to decrease voltage stress of primary side and the synchronous rectifier is used to reduce current stress of secondary side. Previous synchronous rectifier's MOSFET of TTFC have long dead time This paper presents synchronous rectifier of compulsory control-driver for minimized dead time. This paper compared with diode rectifier, self-driven synchronous rectifier and compulsory control-driver synchronous rectifier of TTFC. The principle of operation, feature and design considerations are illustrated and verified through the experiment with a 200W 100kHz MOSFET based experimental circuit.

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Parameter Identification of a Synchronous Reluctance Motor by using a Synchronous PI Current Regulator at a Standstill

  • Hwang, Seon-Hwan;Kim, Jang-Mok;Khang, Huynh Van;Ahn, Jin-Woo
    • Journal of Power Electronics
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    • v.10 no.5
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    • pp.491-497
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    • 2010
  • This paper proposes an estimation algorithm for the electrical parameters of synchronous reluctance motors (SynRMs) by using a synchronous PI current regulator at standstill. In reality, the electrical parameters are only measured or estimated in limited conditions without fully considering the effects of the switching devices, connecting wires, and magnetic saturation. As a result, the acquired electrical parameters are different from the real parameters of the motor drive system. In this paper, the effects of switching devices, connecting wires, and the magnetic saturation are considered by simultaneously using the short pulse and closed loop equations of resistance and synchronous inductances. Therefore, the proposed algorithm can be easily and safely implemented with a reduced measuring time. In addition, it does not need any external or additional measurement equipment, information on the motor's dimensions, and material characteristics as in the case of FEM. Several experimental results verify the effectiveness of the proposed algorithm.

A Study on the characteristics improvement of LLC resonant half-bridge DC-DC converter with synchronous rectifier (LLC 공진형 하프브리지 DC-DC 컨버터용 동기정류기의 특성 개선에 관한 연구)

  • Lee, Gwang-Taek;Lee, Darl-Woo;Ahn, Tae-Young;Kim, Sung-Cheol;Jang, Chan-Gyu;Kim, Young-Joo
    • Proceedings of the KIEE Conference
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    • pp.178-181
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    • 2005
  • This paper presents a synchronous rectifier in a LLC half bridge topology. The proposed synchronous rectifier is used to a current driven synchronous rectifier(SR). If FET is driven without dead times. Voltage driven synchronous rectifier may introduce voltage and current surge during the zero dead times. To solve this problem, we propose to use modified current driven synchronous rectifier. Finally, the prototype is built and comparison on the current and voltage driven synchronous rectifier(SR).

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