• Title/Summary/Keyword: Power Characteristic Variation Simulation

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Modelling of Power Plant Fan Pitch Blade Control Actuator (전력설비 대용량 보일러 통풍기 날개각 제어 작동기 모델링)

  • Huh, J.Y.;Son, T.H.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.4 no.2
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    • pp.28-33
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    • 2007
  • In the power plant facility which use soft coal as a power source the fan pitch blade control hydraulic actuator is used to control the inlet and outlet gas to regulate the internal pressure of the furnace and control the frequence. Sometimes malfunctions of this equipment lead to the decline of boiler thermal efficiency and unexpected power plant trip. In order to localize the fan pitch blade control hydraulic actuator specially for the 500MW large scale boiler, Analysis and modelling of the system is carried out mathematically. The responses of the system are examined by using matlab simulation fur the variation of the major parameters in view of reverse engineering. Consequently the validity of the established parameters are examined.

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Load Modeling of the Drum Washing Machine Considering the Mechanical Characteristics (역학적 특성을 고려한 드럼세탁기 부하 모델링)

  • Lee, Jung-Hyo;Lee, Won-Chul;Yu, Jae-Sung;Jung, Yong-Chae;Won, Chung-Yuen
    • The Transactions of the Korean Institute of Power Electronics
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    • v.12 no.6
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    • pp.491-499
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    • 2007
  • The variation of a load characteristic in the motor drive is one of the most important consideration. Because the current flowing into the motor generally varies according to the load variation, it needs to design the motor drive circuit properly in accordance with the load variation. However, the load variation of the drum washing machine is irregular and large due to the water flow and reverse load torque. Therefore, to design the motor drive circuit considering this load pattern, simulation results shows the load pattern modeling of the drum washing machine based on the physical analysis in this paper.

Load modeling for the drum washing machine system simulation (드럼세탁기 구동시스템 시뮬레이션을 위한 부하 모델링)

  • Lee, Jung-Hyo;Lee, Byoung-Kuk;Won, Chung-Yuen
    • Proceedings of the KIPE Conference
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    • 2007.07a
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    • pp.412-414
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    • 2007
  • In motor driving, one of the most important consideration is the load characteristic and variation. Generally, the motor drive should be made enough for the current by load variation, and it should be controlled by the load weight. However, the drum washing machine's load variation is irregular and large. Therefore, we want to make the motor drive that considering this load pattern, this paper describes the drum washing machine's load pattern modeling by the mathematical theory.

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Numerical Simulation of a Vane Pump Characteristics of an Automotive Power Steering System Using Moving Mesh Technique (이동 격자를 이용한 Power Steering용 Vane Pump 유동 해석)

  • Lee, Sang-Hyuk;Hur, Nahm-Keon;Jin, Bong-Yong
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.459-462
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    • 2006
  • In this study, the characteristic of a vane pump of an automative power steering system is numerically analyzed. The vane pump changes the energy level of operation fluid by converting mechanical input power to hydraulic output. To simulate this mechanism, moving mesh technique is adopted. As a result, the flow rate and pressure are obtained by numerical analysis. The flow rate agrees well with the experimental data. Moreover, the variation and oscillation of the pressure around the rotating vane are confirmed. The difference of pressure appears in the vane tip as a result of the flow characteristics. Furthermore, the back flow into the rotor was observed.

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The characteristic analysis of contact-less Power supply by 3D finite element method

  • Park, Han-Seok;Cho, Yun-Hyun;Jung, Hong-Sub;Woo, Kyung-il;Kim, Kyung-Ho
    • Journal of Advanced Marine Engineering and Technology
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    • v.28 no.1
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    • pp.145-151
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    • 2004
  • This paper proposes the calculation method of magnetic coupling coefficient of contact-less power supply by the 3D finite element method with a variation of the secondary core position. The primary, secondary self and leakage inductances and the capacitances of a resonant circuit are calculated by the finite element analysis results. The magnetic coupling coefficients are obtained also. The power factors are obtained by simulation for the magnetic coupling coefficients and compared.

A Study on Gain of Feedforward Compensator about Source Voltage Variation of Three-phase Series Active Power Filter (3상 직렬형 능동필터의 입력전압변동에 대한 전향보상이득에 관한 연구)

  • Kwon H.N.;Nam N.J.;Kang B.H.;Choe G.H.;Han S.W.
    • Proceedings of the KIPE Conference
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    • 2001.12a
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    • pp.97-101
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    • 2001
  • Recently, as the development of industry, the nonlinear load becomes increased. Because of nonlinear load, the variation of source voltage is generated by the impedace of source side flowed harmonic currents. For blocking harmonic currents by nonlinear load, a series active power filter operates blocking resistance of harmonic currents. The value of blocking resistance shows ideal compensating characteristic out of theoretically infinite value. But the blocking resistance is limited by the problem of the system stability and the capacity of inverter. In this paper, the value of optimum blocking resistance is found by a simulation in the applied system. In the case of unbalanced source voltages, each relation of the blocking resistance is shown. It is proved that blocking resistance of series active power filter relates to a passive filter.

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Design of Optimal pm Controller Using Genetic Algorithm for Load Frequency Control of Power System (전력계통의 부하주파수 제어를 위한 유전 알고리즘을 사용한 최적 PID 제어기 설계)

  • Lee, J.P.;Wang, Y.P.;Kim, S.H.;Hur, D.R.;Chong, H.H.
    • Proceedings of the KIEE Conference
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    • 1997.11a
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    • pp.257-260
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    • 1997
  • This paper designs the optimal PID controller for load frequency control on 2-area power system. Genetic algorithm is utilized to optimize parameters of PID controller which is applied to power system. Using two-point crossover, uniform crossover and one-point crossover, Search performance of genetic algorithm with each crossover method is considered. In case of load variation in 1-area, the dynamic characteristic of power system is considered. The simulation results show that the proposed PID controller is better control performance than PID controller using Ziegler-Nichols method.

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A study on the torque characteristic of AC servo system by phase advance control (진상각 제어에 따른 AC 서보 모터의 토오크 특성에 관한 연구)

  • 임윤택;손명훈;허욱열
    • 제어로봇시스템학회:학술대회논문집
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    • 1992.10a
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    • pp.393-400
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    • 1992
  • The DC(Direct-Current) servo motor has widely used for many application areas, FA(Factory Automation), OA(Office Automation) and home applications. But DC servo motor needs periodical inspection because it has brush and commutator. Recently, AC servo motor has expanded it's application areas due to for the development of the power semi-conductor and control technology. But it has large torque ripple for it's small number of commutation. And it also has cogging torque due to permanent magenet rotor. Therefore it can't run balence rotarion. Many torque ripple reduction methods are published. In this paper, phase advanced method adopted for torque ripple reduction of AC servo motor. In this research, AC servo motor torque characteristic variation surveied under the phase advance control through the computer simulation. Under the simulation, the load inertia varied from 0.0001[Kg.m$^{2}$] to 0.0314[Kg.m$^{2}$]. The result os nonlinear simulation, torque and speed ripple of AC servo motor under the phase advance control reduced approximately 50[%] and 10[%]. And maximum torque of AC servo motor under phase advance control condition increased about 5[%] as compare with fixed switching time.

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A Rotor Position Estimation of SRM with Nonlinear Inductance Variation (비선형 인덕턴스 변화특성을 고려한 SRM의 회전자 위치 추정)

  • Baik Won-Sik;Kim Nam-Hun;Kim Dong-Hee;Choi Kyeong-Ho;Kim Min-Huei
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.972-975
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    • 2004
  • This paper presents a simulation results of sensorless control of Switched Reluctance Motor(SRM) using neural network. The basic algorithm of this scheme is based on the flux linkage characteristic according to the phase current and the rotor position. A sufficient simulation data was used for neural network training. Through measurement of the phase flux linkage and phase currents the neural network is able to estimate the rotor position. The simulation result shows some good results, and possibility of this algorithm.

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Static and Transient Simulation of High Power IGCT Devices (대용량 IGCT 소자의 정상상태 및 과도상태 특성 해석)

  • Kim, Sang-Cheol;Kim, Hyung-Woo;Kim, Eun-Dong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.05c
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    • pp.213-216
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    • 2003
  • Recently a new high power device GCT (Gate Commutated Turn-off) thyristor has been successfully introduced to high power converting application areas. GCT thyristor has a quite different turn-off mechanism to the GTO thyristor. All main current during turn-off operation is commutated to the gate. Therefore, IGCT thyristor has many superior characteristics compared with GTO thyristor; especially, snubberless tum-off capacibility and higher turn-on capacibility. The basic structure of the GeT thyristor is same as that of the GTO thyristor. This makes the blocking voltage higher and controllable on-state current higher. The turn-off characteristic of the GCT thyristor is influenced by the minority carrier lifetime and the performance of the gate drive unit. In this paper, we present turn-off characteristics of the 2.5kV PT(Punch-Through) type GCT as a function of the minority carrier lifetime and variation of the doping profile shape of p-base region.

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