• Title/Summary/Keyword: Power system equipment modeling

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A Study on Simulation of Piston Number for Development of Axial Piston Pump for Wheeled Armored Vehicle (차륜형 장갑차용 액시얼 피스톤 펌프 개발을 위한 피스톤 수에 대한 시뮬레이션에 관한 연구)

  • Choi, Seong Woong;Lee, Chang Don;Yang, Soon Yong
    • Journal of Drive and Control
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    • v.16 no.1
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    • pp.14-21
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    • 2019
  • Axial piston pump is a significant part in wheeled armored vehicle, for generating hydraulic power of vehicle power system. The Axial Piston Pump is a high-performer, core functional item that is developed and applied to most of the military models in the development of military weapon systems. However, in the case of military equipment, there are conditions of limited size and weight required depending on the operating conditions and the operating environment. Under these conditions, it is required that the performance and the environmental resistance are verified to exert the required output. A unique technology is needed for the development of such equipment both in the present and in the future. Therefore, in this study, mathematical modeling of an axial piston pump is presented as a basic data for securing proprietary technology. In addition, a simulation model is designed and compared with the models of six kinds of pistons through simulation. It was established that when the number of pistons of the axial piston pump, which is the development objective, is seven, the model is suitable for the wheeled armored vehicle.

L.E.O. Satellite Power Subsystem Reliability Analysis

  • Zahran M.;Tawfik S.;Dyakov Gennady
    • Journal of Power Electronics
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    • v.6 no.2
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    • pp.104-113
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    • 2006
  • Satellites have provided the impetus for the orderly development of reliability engineering research and analysis because they tend to have complex systems and hence acute problems. They were instrumental in developing mathematical models for reliability, as well as design techniques to permit quantitative specification, prediction and measurement of reliability. Reliability engineering is based on implementing measures which insure an item will perform its mission successfully. The discipline of reliability engineering consists of two fundamental aspects; $(1^{st})$ paying attention to details, and $(2^{nd})$ handling uncertainties. This paper uses some of the basic concepts, formulas and examples of reliability theory in application. This paper emphasizes the practical reliability analysis of a Low Earth Orbit (LEO) Micro-satellite power subsystem. Approaches for specifying and allocating the reliability of each element of the power system so as to meet the overall power system reliability requirements, as well as to give detailed modeling and predicting of equipment/system reliability are introduced. The results are handled and analyzed to form the final reliability results for the satellite power system. The results show that the Electric Power Subsystem (EPS) reliability meets the requirements with quad microcontrollers (MC), two boards working as main and cold redundant while each board contains two MCs in a hot redundant.

Harmonic Impact Studies of Grid-Connected Wind Power and PV Generation Systems (계통연계 풍력 및 태양광발전시스템 고조파 영향 검토)

  • Lee, Sang-Min;Jung, Hyong-Mo;Yu, Gwon-Jong;Lee, Kang-Wan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.11
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    • pp.2185-2191
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    • 2009
  • Wind power and photovoltaic(PV) generation systems are the fastest growing sources of renewable energy. The nonlinear devices, such as power electronic converter or inverter, of wind power and PV generation systems are the source of harmonics in power systems. The harmonic-related problems can have significant detrimental effects in the power system, such as capacitor heating, data communication interference, rotating equipment heating, transformer heating, relay misoperation and switchgear failure. There is a greater need for harmonic analysis that can properly maintain the power quality. By measuring harmonics of existing wind power and PV generation systems as harmonics modeling, the studies were made to see the harmonic impact of grid-connected wind power and PV generation systems.

A STUDY ON EFFECTIVE APPLICATION OF SURGE ARRESTER BETWEEN THE SWITCHYARD AND MAIN TRANSFORMER IN POWER PLANT (발전소내 스위치야드 및 주변압기간 연결선로의 적정 피뢰기 위치 선정)

  • Lee, Heung-Chan;Ham, Young-Soo;Jung, Gi-Soo
    • Proceedings of the KIEE Conference
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    • 1995.07b
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    • pp.503-505
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    • 1995
  • The surge arrester plays a vital role in the protection of substation against transient overvoltages resulting from lightning surges and system switching operations. The proper selection and application of the surge arrester is an integral part of the process of substation equipment insulation level selection. The paper outlines the basic consideration in modeling the lightning stroke, the surge arrester, and the system to be protected. The paper discusses the results of various cases simulated using the alternative transient computer program to evaluate the separation effects.

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A Study on the Characteristic of Motion and Resistance Performance from the Body Plan of Planning Leisure boat at low speed (저속시 활주형 레저보트의 단면형상에 따른 저항·내항성능 특성연구)

  • Park, C.H.;An, N.H.;Jang, H.Y.;Kwon, Y.W.
    • Journal of Power System Engineering
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    • v.16 no.4
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    • pp.17-23
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    • 2012
  • In this study, the numerical simulation and basin model test have been performed to evaluate sea worthiness and resistance performance for a small pre-planning three type of leisure boats which are U, V, Y shapes of hull forms. As a well known commercial CFD code, Maxsurf, was applied for modeling hull forms used as the solver of motion analysis. Also the model resistance test was carried out to estimate the effective power of boat in the basin tank. Numerical simulation and model test results show that Y-shaped hull is better than the other types in terms of heave and pitch motion, having a key effect on a boat sea worthiness. But V-type hull is more efficiency than others cases in resistance performance.

Electromagnetic Transient Program Modeling for Analysis of Switching Over-Voltage on Shunt Reactor (분로리액터 개폐 과전압 해석을 위한 EMTP 모델링)

  • Oh, SeungRyle;Jun, InYoung;Han, KiSun;Kang, JiWon
    • KEPCO Journal on Electric Power and Energy
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    • v.6 no.4
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    • pp.393-397
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    • 2020
  • Shunt reactor, a facility for reactive power compensation, is switched several times a day depending on the load pattern. When the circuitbreaker opens the shunt reactor over-voltage is generated by several factors which degrade the insulating performance of internal parts of the circuit-breaker and cause severe voltage stress on the equipment in the power system. Transient phenomenon occurring during the switching of shunt reactor are available in laboratories that verify the performance of the circuit-breaker by simulating the power system. However, it is difficult to measure the transient phenomenon that occurs during actual operation in actual power system due to many limitations. Therefore, this paper deals with the modeling using EMTP to analyze the reignition and current chopping which causes more severe transient recovery voltage in the small inductive current breaking in actual power systems. In addition, this paper analyzes the main phenomenon that cause circuit-breaker failure in opening shunt reactor using EMTP model.

Scott Transformer Modeling using PSIM on the AC Substation in the Elect ric Railroad (전기철도의 교류 급전변전소에서 PSIM을 이용한 스코트변압기 모델링)

  • Kim, Sung-Dae;Choi, Kyu-Hyoung
    • Proceedings of the KSR Conference
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    • 2010.06a
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    • pp.1892-1897
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    • 2010
  • In three-phase power, when the power is supplied to the single phase load, there is the unbalance of load in the three-phase power. So the scott transformer is used in the power system to supply a single phase load in three-phase power without the unbalance of loads. Especially, the scott transformer is used in the AC substation of electric railroad. Two single phase transformers are combined by T-wiring in the scott transformer. So, two single phase voltage is provided by differing $90^{\circ}$ phase in three-phase power. The selection of related equipment and correction of protective relay are not easy from characteristic of the scott transformer when shunt and ground faults occur. PSIM(Power Electronics Simulator) is optimal simulation software in field of the power electronics and provide the simple and convenient user interface. In this paper, electric model of the scott transformer is suggested and the current of the scott transformer in shunt and ground faults is analyzed. Also, the scott transformer model is demonstrated by using PSIM.

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A Study of Modeling Optimization Scheme for application of Power System Voltage & Compensating Phase Modifying Equipment (계통전압 및 보상용 조상설비 적용 검토시 S.C 모델링 최적화 방안 연구)

  • Yun Ki Seob;Baik Seung Do;Kim Ju Seong
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.192-194
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    • 2004
  • At present, application of PSS/E input data for power flow , stability and fault analysis consist of only 154kV and over data(except 22.9kV data). 22.9kV(5.C) Static Condenser is in operation and installation at 22.9kV Bus of 154kV Substation. however, we assume that 22.9kV 5.C install at 154kV Bus. so, we need to study and search about critical limit for 154kV Bus standard operating Voltage according to 22.9kV 5.C Modeling Site by PSS/E Ver28

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A Study on Estimator and Controller Design of VSC Hydraulic Unit (VSC 유압유닛의 압력 추정기 및 제어기 설계에 관한 연구)

  • Yoo Seung-Jin;Kim Beom-Joo;Lee Kyo-Il
    • Transactions of The Korea Fluid Power Systems Society
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    • v.2 no.4
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    • pp.7-13
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    • 2005
  • This paper presents modeling and ostimator/controller design for the hydraulic system in Vehicle Stability Control(VSC) system. A nonlinear mathematical model of the VSC hydraulic system is proposed and its accuracy is experimentally verified. A brake pressure estimator is then designed based on the derived mathematical model of VSC hydraulic system. And a disturbance observer, which compensates the estimation error between the brake pressure and the computed brake pressure is also designed to enhance the accuracy of the estimator. The proposed controller has the form of a feedback controller and determines explicitly the on/off ratio of valves' driving PWM signals by means of making use of the simplified mathematical model in the VSC hydraulic system. The performance of the designed controller whose feedback signal is generated by the brake pressure estimator is validated through experimental results.

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Modeling and Performance Investigation of Forklift Transmission Control Valve System (지게차 변속제어밸브의 모델링 및 성능 검증)

  • Truong, D.Q.;Ahn, K.K.;Yoon, J.W.
    • Journal of Drive and Control
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    • v.11 no.3
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    • pp.1-6
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    • 2014
  • In forklifts, the machine performance is largely depended on the transmission performance. The aim of this paper is to develop a complete model of transmission control valve (TMV) system of a typical forklift using AMESim simulation tool. By using the developed TMV model, it becomes easy to investigate the system concept, working principle, and performance. In addition, an optimization on the TMV structure can be achieved by using this model with tunable parameters. Simulations have been carried out in a comparison with the actual experiments to verify the model.