• Title/Summary/Keyword: Power modeling

Search Result 3,046, Processing Time 0.03 seconds

A Study for DC 1500V Railroad System Modeling Using EMTDC

  • Lee, Han-Sang;Lee, Chang-Mu;Lee, Han-Min;Jang, Gil-Soo
    • Proceedings of the KIEE Conference
    • /
    • 2006.07a
    • /
    • pp.218-219
    • /
    • 2006
  • This paper is about modeling on 1500V DC electric railroad system. Electric railroad systems have peculiar characteristics against other electric system. The characteristics arc that the railroad systems have electric vehicle loads which are power-varying and location-varying with time. Because of this load characteristic, the electric railroad system modeling which reflects its own characteristics on EMTDC simulation could not be achieved. However, to reflect load characteristic on EMTDC, this paper suggests electric railroad system modeling by using TPS (Train Performance Simulator) that was developed in Korea Railroad Research Institute. A TPS program has various kinds of input data, such as operation condition, vehicle condition, and power system condition. By these data, TPS calculates mechanical power consumption and location, especially it decide electric power consumption on the basis of the fact that consumed electric and mechanical power are equal. Moreover, on this paper, movement of vehicle is reflected on EMTDC simulation as variation of feeder impedance. Also, an electric vehicle load is modeled as time-varying constant power load model.

  • PDF

Validation of Generalized State Space Averaging Method for Modeling and Simulation of Power Electronic Converters for Renewable Energy Systems

  • Rimmalapudi, Sita R.;Williamson, Sheldon S.;Nasiri, Adel;Emadi, Ali
    • Journal of Electrical Engineering and Technology
    • /
    • v.2 no.2
    • /
    • pp.231-240
    • /
    • 2007
  • This paper presents an advanced modeling and simulation technique applied to DC/DC power electronic converters fed through renewable energy power sources. The distributed generation (DG) system at the Illinois Institute of Technology, which employs a phase-l system consisting of a photovoltaic-based power system and a phase-2 system consisting of a fuel cell based primary power source, is studied. The modeling and simulation of the DG system is done using the generalized state space averaging (GSSA) method. Furthermore, the paper compares the results achieved upon simulation of the specific GSSA models with those of popular computer aided design software simulations performed on the same system. Finally, the GSSA and CAD software simulation results are accompanied with test results achieved via experimentation on both, the PV-based phase-l system and the fuel cell based phase-2 power system.

Probabilistic Modeling of Photovoltaic Power Systems with Big Learning Data Sets (대용량 학습 데이터를 갖는 태양광 발전 시스템의 확률론적 모델링)

  • Cho, Hyun Cheol;Jung, Young Jin
    • Journal of the Korean Institute of Intelligent Systems
    • /
    • v.23 no.5
    • /
    • pp.412-417
    • /
    • 2013
  • Analytical modeling of photovoltaic power systems has been receiving significant attentions in recent years in that it is easy to apply for prediction of its dynamics and fault detection and diagnosis in advanced engineering technologies. This paper presents a novel probabilistic modeling approach for such power systems with a big data sequence. Firstly, we express input/output function of photovoltaic power systems in which solar irradiation and ambient temperature are regarded as input variable and electric power is output variable respectively. Based on this functional relationship, conditional probability for these three random variables(such as irradiation, temperature, and electric power) is mathematically defined and its estimation is accomplished from ratio of numbers of all sample data to numbers of cases related to two input variables, which is efficient in particular for a big data sequence of photovoltaic powers systems. Lastly, we predict the output values from a probabilistic model of photovoltaic power systems by using the expectation theory. Two case studies are carried out for testing reliability of the proposed modeling methodology in this paper.

Analysis and Modeling of Fishing Boat's Power Network for using Renewable Energy Source (신재생 에너지원 활용을 위한 어선 전력계통 분석 및 모델링)

  • Lee, Sang-Jung;Lee, Dong-Gil;Jung, Jee-Hoon
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.21 no.2
    • /
    • pp.182-189
    • /
    • 2016
  • A modeling method of electric power network inside a fishing boat less than 5 tons is proposed for its high-energy efficiency with renewable energy sources. The power network inside the fishing boat consists of a diesel engine, a starter motor, an alternator, battery packs, and electric loads, which are connected in parallel. To obtain proper power network model, the voltage -current characteristics of the electric components are considered to develop elaborate electrical models under several load conditions. Measured data of the battery and alternator current include noise. By using an average method, the AC components from the power network of the fishing boat can be reduced, which is verified by KCL rule. Using the proposed power network model, the power generation of the alternator and the reduction of diesel consumption in the boat's engine are predictable under various operating conditions. The validity of the proposed methodology is verified by comparing simulation results with experimental measurements using statistical inferences.

A Study of High-Power Dissipation Parts Modeling for Spacecraft PCB Thermal Analysis (위성 PCB 열해석을 위한 고 전력소산 소자의 모델링 연구)

  • 이미현;장영근;김동운
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.34 no.6
    • /
    • pp.42-50
    • /
    • 2006
  • This paper addresses the optimized thermal modeling methodology for spacecraft board level thermal analysis. A direct thermal modeling of external and internal structure of active parts which have high power dissipation is newly proposed, based on conventional plate modeling for Printed Circuit Board(PCB). The parts thermal modeling results were compared with other generic methodologies and verified by thermal vacuum test. This parts thermal modeling was directly applied to thermal analysis of CS(Communication Subsystem) board of HAUSAT-2 small satellite. As a result, it was confirmed that the parts thermal modeling can complement other conventional modeling methodologies. A parts thermal modeling is very effective for thermal control design, since the existing thermal problems can be solved at the parts level in advance.

A Study on Modeling Methods for Cable Covering Protective Unit on Underground Power Cable Systems (지중송전계통 절연통보호장치 모델링 기법에 관한 연구)

  • Choi, Kyung-Kyu;Jang, Tae-In;Yoon, Hyung-Hee;Jung, Chae-Kyun
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.56 no.12
    • /
    • pp.2098-2102
    • /
    • 2007
  • The conventional CCPU(Cable Covering Protective Unit) modeling methods which are used by Type 99 and Type 92 in EMTP simulation are firstly discussed in this paper, and then some problems of them are also investigated. Modeling method using Type 99 causes unstable characteristic at initial transient of CCPU operation. Time delay has also effect on the output of CCPU modeling. So, in this paper, a new modeling method for CCPU is designed by DBM(Data Base Module) of EMTP. The characteristic of Type 92 is used for the new modeling method. The reliability of this one is proved by comparing simulation with measured data. Specially, at initial transient, the waveform of the new method shows more stable result than that of conventional method using Type 99. Also, the peak value is similar to measured data.

A Low-Power Design and Implementation of the Portable Device for Measuring Temperature and Humidity Based On Power Consumption Modeling (소비 전력 모델링에 입각한 휴대용 온습도 측정기의 저전력 설계 및 구현)

  • Lee, Chul-Ho;Hong, Youn-Sik
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.15 no.2
    • /
    • pp.1027-1035
    • /
    • 2014
  • The most important design factor for portable devices is power consumption. In this paper, in the early design stage of a mobile device which measures temperature and humidity a power consumption model will be proposed and then the overall power consumption will be estimated based on this model. We will verify previously the correctness of such estimated power consumption before implementation of the real device. That is our proposed design methodology based on power consumption model. An improved design method for efficiently reducing the current consumption in the idle mode is also presented. By implementing a real prototype of the mobile device for measuring temperature and humidity, the correctness of our proposed design methodology based on power consumption modeling will be verified.

Modeling and Evaluation on the Dispersion of Air Pollutants in the Large Scale Thermal Power Plant (대단위발전소의 대기오염물질 확산에 관한 모델링 및 평가에 관한 연구)

  • Chun, Sang-Ki;Lee, Sung-Chul
    • Journal of Environmental Impact Assessment
    • /
    • v.6 no.2
    • /
    • pp.81-92
    • /
    • 1997
  • This paper presents the results from the comparison analysis and evaluation between the air pollutant dispersion modeling results and the observation data in the area within a 10 km radius from the Boryong thermal power plants. The observation data used in this study were the air pollutant concentrations which had been continuously measured from 8 locations around the Boryong power plants by TMS(tele-monitoring system) for 3 months from September to November, 1996. The short-term and long-term predictions were carried out using ISC3 model and LPDM(Lagrangian Panicle Dispersion Model). The results of ISC3 modeling in a short-term showed highly as 0.7 in a correlation coefficient, but in a long-term showed just 0.54. On the other hand, LPDM showed 0.78 in a correlation coefficient for a long-term, but in a short-term showed highly value than the observation concentrations.

  • PDF

Study on Modeling of GaN Power FET (GaN Power FET 모델링에 관한 연구)

  • Kang, Ey-Goo;Chung, Hun-Suk;Kim, Beum-Jun;Lee, Young-Hun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2009.11a
    • /
    • pp.51-51
    • /
    • 2009
  • In this paper, we proposed GaN trench Static Induction Transistor(SIT). Because The compound semiconductor had superior thermal characteristics, GaN and SiC power devices is next generation power semiconductor devices. We carried out modeling of GaN SIT with 2-D device and process simulator. As a result of modeling, we obtained 340V breakdown voltage. The channel thickness was 3um and the channel doping concentration is 1e17cm-3. And we carried out thermal characteristics, too.

  • PDF

Study on Modeling of GaN Power FET (GaN Power FET 모델링에 관한 연구)

  • Kang, Ey-Goo;Chung, Hun-Suk;Kim, Beum-Jun;Lee, Young-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.22 no.12
    • /
    • pp.1018-1022
    • /
    • 2009
  • In this paper, we proposed GaN trench Static Induction Transistor(SIT). Because The compound semiconductor had superior thermal characteristics, GaN and SiC power devices is next generation power semiconductor devices. We carried out modeling of GaN SIT with 2-D device and process simulator. As a result of modeling, we obtained 340 V breakdown voltage. The channel thickness was 3 urn and the channel doping concentration is $1e17\;cm^{-3}$. And we carried out thermal characteristics, too.