• Title/Summary/Keyword: electric circuit modeling

Search Result 118, Processing Time 0.022 seconds

Steady-State Harmonic Domain Matrix-Based Modeling of Four-Quadrant EMU Line Converter

  • Wang, Hui;Wu, Mingli;Agelidis, Vassilios G.;Song, Kejian
    • Journal of Power Electronics
    • /
    • v.14 no.3
    • /
    • pp.572-579
    • /
    • 2014
  • As a non-linear time variant system, the four-quadrant line converter of an electric multiple unit (EMU) was expressed by linear time periodic functions near an operating point and modeled by a steady-state harmonic domain matrix. The components were then combined according to the circuit connection and relations of the feedback control loops to form a complete converter model. The proposed modeling method allows the study of the amplitude of harmonic impedances to explore harmonic coupling. Moreover, the proposed method helps provide a better design for the converter controllers, as well as solves the problem in coordination operation between the EMUs and the AC supply. On-site data from an actual $CRH_2$ high-speed train were used to validate the modeling principles presented in the paper.

Development of Equivalent Magnetic Circuit Network Method for 3-D Eddy Current Analysis (3차원 와전류 해석을 위한 등가자기회로망법의 개발)

  • Hur, Jin;Hong, Jung-Pyo;Hyun, Dong-Seok
    • Proceedings of the KIEE Conference
    • /
    • 2001.07b
    • /
    • pp.693-695
    • /
    • 2001
  • A computational method for the 3 dimensional electro-magnetic induction problems has been developed. The proposed method is capable of modeling the eddy current and analyzing its characteristics using only scalar potential. A benchmark model of asymmetrical conductor with a hole is analyzed to verify the application of the developed method. The calculated value of magnetic flux density are compared with the measured value, and the results indicate that the developed method is valid.

  • PDF

Vector Control Simulation of Single-sided Linear Induction Motor affected end-effect (단부효과 영향에 따른 편측형 선형유도전동기 백터제어 시뮬레이션)

  • Lim, Hong-Woo;Jang, Yong-Hae;Kim, Dong-Whi;Seo, Jin-Youn;Cho, Geum-Bae;Baek, Hyung-Lae
    • Proceedings of the KIEE Conference
    • /
    • 2003.07b
    • /
    • pp.967-969
    • /
    • 2003
  • It is difficult to realize the complicate SUM which is applied vector control system, but widely used in AC motor vector motor control system or servo control system because of its high performance in current control. In this paper, we use the dynamic characteristic analyzing methode that can calculate efficiently the end effect by using equivalent circuit methode in the operating SLIM system modeling and doing simulation of output characteristics of vector controller.

  • PDF

Modeling and Simulation of Electrical Power System of Electric Vehicle (전기자동차 전력 시스템의 모델링 및 시뮬레이션)

  • Lee, Jea-Moon;Cho, Bo-Hyung
    • Proceedings of the KIEE Conference
    • /
    • 1996.11a
    • /
    • pp.355-358
    • /
    • 1996
  • Electrical Power System (EPS) of Electric Vehicle which consists of batteries, motor and driving subsystem, has been modeled. A battery model is modeled with an electrical circuit representing a characteristics of real battery. Driving subsystem is modeled as three different level namely exact, average and functional models. Load profile includes road information, speed profile and EV mechanical parameters, which are incorporated into a reference torque in the driving subsystem model. A system model is integrated to simulate the performance of electric vehicle such as energy balance, battery status, and electrical stress of each subsystem.

  • PDF

Analysis on Induced Surge Voltage of Electric Car Line affected by Lightning in Rapid-Transit Railway System (고속철도시스템에서 낙뢰로 인해 전차선에 유도되는 서지전압의 해석)

  • Lee, Sung-Gyen;Lee, Kun-A;Ko, Kwang-Cheol
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.29 no.5
    • /
    • pp.65-70
    • /
    • 2015
  • Lightning is one of hazards affecting the rapid-transit railway system. There are two effects, which are direct lightning surge to electric car line and induced lightning surge. Protection methods for the direct lightning surge are studied with various occasions, however, study of induced lightning surge is insufficient in spite of a large or small effects. In this paper, it is analysed the way that serge voltage is induced to electric car line by lightning strikes. By modeling the propagation process and the coupling phenomenon of electromagnetic wave produced by lightning strikes, it is achieved to make integrative circuit model combined with existing electric car model. The study is conducted into three different waveform of electromagnetic wave produced by lightning; rectangular wave, double exponential distribution wave, triangle wave. It is also simulated that the inducing serge is coupled to electric car line in an arbitrary location. The simulation results in that, when rapidly changing rectangular wave is supplied, maximum power is induced to electric car line.

Modeling and Simulation of the Cardiovascular System Using Baroreflex Control Model (압반사 제어모델을 이용한 심혈관 시스템의 모델링 및 시뮬레이션)

  • Choi, B.C.;Eom, S.H.;Nam, G.K.;Son, K.S.;Lee, Y.W.;Jun, K.R.
    • Proceedings of the KOSOMBE Conference
    • /
    • v.1997 no.05
    • /
    • pp.165-170
    • /
    • 1997
  • In this paper, we consider the aortic sinus baroreceptor, which is the most representative baroreceptors sensing the variance of pressure in the cardiovascular system(CVS), and propose heart activity control model to observe the effect of delay time in heart period and stroke volume under the regulation of baroreflex in arotic sinus. The proposed heart activity baroreflex regulation model contains CVS electric circuit sub-model, baroreflex regulation sub-model and time delay sub-model. In these models, applied electric circuit sub-model is researched by B.C.Choi and the baroreflex regulation sub-model transforms the input, the arotic pressure of CVS electric circuit sub-model, to outputs, heart period and stroke volume by mathematical nonlinear feedback. We constituted the time delay sub-model to observe sensitivity of heart activity baroreflex regulation model by using the variable value to represent the control signal transmission time from the output of baroreflex regulation model to efferent nerve through central nervous system. The simulation object of this model is to observe variability of the CVS by variable value in time delay sub-model. As simulation results, we observe three patterns of CVS variability by the time delay. First, if the time delay is over 2.5 sec, arotic pressure, stroke volume and heart rate is observed nonperiodically and irregularly. Second, if the time delay is from between 0.1 sec and 0.25 sec, the regular oscillation is observed. Finally, if time delay is under 0.1 sec, then heart rate and arotic pressure-heart rate trajectory is maintained in stable state.

  • PDF

Characteristic Analysis of Integrated Power System and Propulsion Motor Comparison for Electric Vessels According to the Driving Condition (전기추진선박의 운전조건별 전력특성 및 추진전동기 특성 비교 해석)

  • Lee, Sang-Gon;Jeong, Yu-Seok;Jung, Sang-Yong;Lee, Cheol-Gyun
    • Journal of IKEEE
    • /
    • v.15 no.1
    • /
    • pp.96-103
    • /
    • 2011
  • This paper deals with the characteristic analysis of the integrated power system applied for the electric propulsion ships. This includes the electric power system modeling which is accomplished with the electric power network mainly composed of generators, switchboards, variable frequency devices, electric motors, and etc. In addition, performance comparison between the permanent magnet synchronous motor (PMSM) and the induction motor (IM) for 3.7MW ship propulsion has been done. In order to investigated the main performance of propulsion motor, a coupled model taking into account torque density, copper loss, iron loss, efficiency, power factor, and torque ripple using finite element analysis (FEA) has been employed.

Power output and efficiency of a negative capacitance and inductance shunt for structural vibration control under broadband excitation

  • Qureshi, Ehtesham Mustafa;Shen, Xing;Chang, Lulu
    • International Journal of Aeronautical and Space Sciences
    • /
    • v.16 no.2
    • /
    • pp.223-246
    • /
    • 2015
  • Structural vibration control using a piezoelectric shunt is an established control technique. This technique involves connecting a piezoelectric patch, which is bonded onto or embedded into the vibrating structure, to an electric shunt circuit. Thus, vibration energy is converted into electrical energy and is dissipated through a network of electrical components. Different configurations of shunt have been researched, among which the negative capacitance-inductance shunt has gained prominence recently. It is basically an analog, active circuit consisting of operational amplifiers and passive elements to introduce real and imaginary impedance on the vibrating structure. The present study attempts to model the behavior of a negative capacitance-inductance shunt in terms of power output and efficiency using circuit modeling software. The shunt model is validated experimentally and is used to control the structural vibration of an aluminum beam, connected to a pair of piezoelectric patches, under broadband excitation. The model is also used to determine the optimal parameters of a negative capacitance-inductance shunt to increase the efficiency and predict the voltage output limit of op-amp against the supply voltage.

Accurate parameter extraction method for FD-SOI MOSFETs RF small-signal model including non-quasi-static effects (NQS효과를 고려한 FD-SOI MOSFET의 고주파 소신호 모델변수 추출방법)

  • Kim, Gue-Chol
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.11 no.10
    • /
    • pp.1910-1915
    • /
    • 2007
  • An accurate and simple method to extract equivalent circuit parameters of fully-depleted silicon-on-insulator MOSFETs small-signal modeling operating at RF frequencies including the non-quasi static effects is presented in this article. The advantage of this method is that a unique and physically meaningful set of intrinsic equivalent circuit parameters is extracted by de-embedding procedure of extrinsic elements such as parasitic capacitances and resistances of MOSFETs from measured S-parameters using simple Z- and Y- matrices calculations. The calculated small-signal parameters using the presented extraction method give modeled Y-parameters which are in good agreement with the measured Y-parameters from 0.5 to 20GHz.

Application of HHT for Online Detection of Inter-Area Short Circuits of Rotor Windings of Turbo-Generators Based on the Thermodynamics Modeling Method

  • Wang, Liguo;Wang, Yi;Xu, Dianguo;Fang, Bo;Liu, Qinghe;Zou, Jing
    • Journal of Power Electronics
    • /
    • v.11 no.5
    • /
    • pp.759-766
    • /
    • 2011
  • This paper focuses on monitoring and predicting the short circuit faults of the rotor windings of large turbo-generator systems. For the purpose of increasing efficiency and decreasing maintenance cost, a method that combines the HHT (Hilbert Huang Transform) with a wavelet has been studied. This method is based on analyzing a classical Albright detecting coil. Due to the Empirical Mode Decomposition (EMD) and the Intrinsic Mode Functions (IMF) of the HHT the exact location of a short circuit of rotor windings may be given. However, a part of the useful information is eliminated by the unreasonable decomposing scale of the wavelet. Based on the thermodynamics modeling method, this study was illustrated with a 50MW turbo-generator system that is installed in Northern China. The analysis results, which have very good agreement with those of a previous study, show that the method of combining the HHT with a wavelet is an effective way to analyze and predict the short circuit faults of the rotor windings of large generators, such as supercritical turbo-generator systems and wind turbo-generator systems. This work can offer a useful reference for analyzing smart grids by improving the power quality of a distribution network that is supplied by a turbo-generator system.