• Title/Summary/Keyword: Power Subsystem

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Key Application Technologies of High Efficiency Power Quality Control Systems

  • Liu, Ding-Guo;Shuai, Zhi-Kang;Tu, Chun-Ming;Cheng, Ying;Luo, An
    • Journal of Power Electronics
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    • v.13 no.3
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    • pp.458-468
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    • 2013
  • Large capacity reactive power compensation and harmonic control in the low-voltage grid of an enterprise, are important technical means to improve power quality and reduce power loss. In this paper, the principle of an efficient power quality controller is analyzed. Then, key application technologies of the HPQC which would influence the performances of the HPQC are studied. Based on an analysis of the harmonic shunt problem, a frequency dividing control strategy of the HPQC continuous subsystem is proposed. A parameter design method of the HPQC discrete subsystem and its installation method are also proposed to ensure the system compensation effect. HPQC systems have been designed for a copper foil plant. The effectiveness of this paper has been verified by the simulation and application results.

A Study on the Verification of Electrical Power Subsystem for LEO Satellite (저궤도 위성의 전력시스템 검증에 관한 연구)

  • Park, Hee-Sung;Park, Sung-Woo;Jang, Jin-Bak;Jang, Sung-Soo;Lee, Sang-Kon
    • Proceedings of the KIPE Conference
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    • 2007.07a
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    • pp.52-54
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    • 2007
  • The LEO satellite generates the power during day and consumes the power during night, so the power changes repeatedly. The power fluctuation must be verified, because it affects the mission operation and lifetime of satellite. This study describes the test-set for verification of Electrical Power Subsystem and two verification items using it. The verification test of EPS will be useful to predict the mission lifetime and to decide the mission operation of satellite.

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Study of the Functional Test and Quality Assurance Procedure of High Performance Aircraft Control Surfaces Integrate Servo Actuator (고성능 통합 비행 조정면 구동 장치의 성능 시험 및 품질보증 절차 수립에 관한 연구)

  • Jo, Jang-Hyen
    • Journal of the Korean Society of Industry Convergence
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    • v.3 no.3
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    • pp.251-256
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    • 2000
  • This report analyzes the Source Qualification Test which is composed of main functional and environmental tests for the localizing avionics(electronic subsystem for aircrafts and spacecraft) and high performance mechanical subsystem. Especially the detail test approaches of integrated servo actuators which is the main part to supply the power to the main and other flying control panel. Nowadays this subsystem works with mechanical and electrical engineering technique. In detail, electrical signal is used as input and transferring tool and mechanical part is the output as a power and manufacture the physical dimensions and functions. Finally in this review, the new test procedure to prove the function by the new manufacturer is established.

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Reverse Link Characterization of a Spectrally Overlaid Macro/Micro Cellular CDMA System Supporting Multimedia Traffic (멀티미디어 서비스를 위한 스펙트럼 중첩 매크로/마이크로 셀룰러 CDMA 시스템의 역방향 링크 특성)

  • Kang, Chang-Soon;Park, Joong-Han
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.7A
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    • pp.440-450
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    • 2003
  • The reverse link of a spectrally overlaid macrocell/microcell cellular CDMA system supporting multimedia traffic is characterized in terms of the required signal power, interference, and capacity. Several narrowband subsystems are overlaid with a wideband subsystem in macrocells, while a single wideband subsystem is operated in a microcell with the same spectrum as the macrocell wideband subsystem. Using a typical propagation model the reverse link signal power and interference are characterized as the relative user signal power and the cross-tier interference factors between the macrocell and the microcell. The reverse link capacity of the overlay system is then analyzed. Analytical results show that the dominant parameters affecting the system performance are the spectral overlay ratio and the distance between the microcell and macrocell base stations. In particular, when the distance equals a half of macrocell radius, optimum performance can be achieved by minimizing the cross-tier interference factors. These results can be applied to CDMA multimedia network planning in heavily populated traffic areas.

Development of ETRI satellite simulator-ARTSS

  • Kang, J.Y.;Lee, S.;Hong, K.Y.;Shin, K.K.;Rhee, S.W.;Choi, W.S.;Oh, H.S.;Kim, J.M.;Chung, S.J.
    • 제어로봇시스템학회:학술대회논문집
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    • 1994.10a
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    • pp.49-53
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    • 1994
  • Advanced Real-Time Satellite Simulator(ARTSS) has been developed to support the telemetry, tracking and command operations of the ETRI satellite control system and to provide satellite engineers a more powerful and informative satellite simulations tool on the desktop. To provide extensive simulation functions for a communication satellite system in the pre-operational and operational missions, ARTSS uses a geosynchronous orbit(GEO) satellite model consisting of the attitude and orbit control subsystem, the power subsystem, the thermal subsystem, the telemetry, command and ranging subsystem, and the communications payload subsystem. In this paper, the system features and functions are presented and the satellite subsystem models are explained in detail.

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Development of HAUSAT-1 Picosatellite Communication Subsystem as a Test Bed for Small Satellite Technology

  • Moon, Byoung-Young;Kim, Young-Hyun;Chang, Young-Keun
    • International Journal of Aeronautical and Space Sciences
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    • v.5 no.1
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    • pp.6-18
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    • 2004
  • This paper addresses the development and design of the HAUSAT-l (Hankuk Aviation University SA'Tellite-D communication subsystem, which is a next generation picosatellite, developed by SSRL (Space System Research Lab.) of Hankuk Aviation University. The communication subsystem generally consumes the majority of power and volume for picosatellites, and thus its design is critical to the overall satellite and mission plans. The HAUSAT-l designs are implemented by using the 145.84 MHz for uplink and 435.84 MHz for downlink frequency bands. The simulation and test results of the homemade radio and the TNC (Terminal Node Controller) integrated on the HAUSAT - I , a picosatellite scheduled to launch on September 2004 by Russian launch vehicle "Dnepr", are presented for EM, QM and FM, respectively.

Development of a 200 W Portable PEM Fuel Cell System (200 W급 휴대용 고분자 전해질막 연료전지 시스템 개발)

  • Han, Hun-Sik;Kim, Yun-Ho;Cho, Chang-Hwan;Kim, Seo-Young;Hyun, Jae-Min
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.24 no.2
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    • pp.91-101
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    • 2012
  • A 200 W portable polymer electrolyte membrane fuel cell (PEMFC) system is developed. The PEMFC system consists of an air-cooled fuel cell stack module, a fuel supply subsystem, a power management subsystem, and a control electronics subsystem. The control logic is designed for the stable system operation. The system-level performance evaluation discloses that the present PEMFC system provides a rated power output of 200.5 W at 13.4 V with the maximum balance-of-plant (BOP) efficiency of 72%, and maximum system efficiency based on lower heating value (LHV) is 37% at 120.7 W system power output.

Design of Power Subsystem Simulator for KOMPSAT Using Object Oriented Methods (객체지향기법을 이용한 다목적 실용위성 전력계 시뮬레이터 설계)

  • Joung Gyu Bum;Lee Sanguk;Cho Sungki;Kim Jae Hoon;Han Kyoungmin;Choi Young Kyu
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.681-684
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    • 2002
  • In this paper, electrical power subsystem(EPS) simulator for KOMPSAT 2 has been analyzed designed and simulated by object oriented design(OOP) method. To design EPS simulator, the EPS modules, which modeled solar array, solar array regulator, deployment device controller, battery, power control unit, and EPS control unit, are modeled. To verify the EPS simulator, the modules has been simulated. By OOP designs, the EPS simulator is very powerful because this method is applicable to design other EPS simulator.

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A Study on the Feedforward Neural Network Based Decentralized Controller for the Power System Stabilization (전력계토 안정화 제어를 위한 신경회로만 분산체어기의 구성에 관한 연구)

  • 최면송;박영문
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.43 no.4
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    • pp.543-552
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    • 1994
  • This paper presents a decentralized quadratic regulation architecture with feedforward neural networks for the control problem of complex systems. In this method, the decentralized technique was used to treat several simple subsystems instead of a full complex system in order to reduce training time of neural networks, and the neural networks' nonlinear mapping ability is exploited to handle the nonlinear interaction variables between subsystems. The decentralized regulating architecture is composed of local neuro-controllers, local neuro-identifiers and an overall interaction neuro-identifier. With the interaction neuro-identifier that catches interaction characteristics, a local neuro-identifier is trained to simulate a subsystem dynamics. A local neuro-controller is trained to learn how to control the subsystem by using generalized Backprogation Through Time(BTT) algorithm. The proposed neural network based decentralized regulating scheme is applied in the power System Stabilization(PSS) control problem for an imterconnected power system, and compared with that by a conventional centralized LQ regulator for the power system.

Design of an Input-Parallel Output-Parallel Multi-Module DC-DC Converter Using a Ring Communication Structure

  • Hu, Tao;Khan, Muhammad Mansoor;Xu, Kai;Zhou, Lixin;Rana, Ahmad
    • Journal of Power Electronics
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    • v.15 no.4
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    • pp.886-898
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    • 2015
  • The design feasibility of a micro unidirectional DC transmission system based on an input-parallel output-parallel (IPOP) converter is analyzed in this paper. The system consists of two subsystems: an input-parallel output-series (IPOS) subsystem to step up the DC link voltage, and an input-series output-parallel (ISOP) subsystem to step down the output voltage. The two systems are connected through a transmission line. The challenge of the delay caused by the communication in the control system is addressed by introducing a ring communication structure, and its influence on the control system is analyzed to ensure the feasibility and required performance of the converter system under practical circumstances. Simulation and experiment results are presented to verify the effectiveness of the proposed design.