• Title/Summary/Keyword: Power analysis

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Power Circulation Characteristics of Hydro-Mechanical transmission System in Steering (정유압 기계식 변속기의 조향시 동력 순환 특성)

  • Kim, J. S.;Kim, W.;Jung, Y. H.;Jung, S. B.;Kim, H. S.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.2
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    • pp.13-22
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    • 1997
  • Power flow characteristics of a hydro-mechanical transmission system(HMT) are investigated for tracked vehicle in steering. A HMT consisting of two hydrostatic pump motors(HST), several planetary gear trains and steer differential gear is considered. In order to obtain the direction and magnitude of the power flow of the HMT, network theory for the general power transmission is used. Network model for the HMT in steering is developed, which consists of shafts, nodes and transmission elements such as clutch, gear, etc. Power flow analysis procedure consists of two stages : (1) traction force analysis in steering, (2) power flow analysis in HMT. Torque and speed of every transmission element of the HMT is determined from the network analysis. Also, efficiency, mechanical and hydraulic power loss including HST, are obtained. In addition, the regenerative power flow resulting from steering can be studied in graphic display. The power flow analysis program(PCSTEER) developed in this work can be used as a useful design tool for the tracked vehicle with HMT.

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Maximum Power Analysis Simulator Development & Lighting Installation Control Simulation (최대전력 분석시뮬레이터 개발 및 조명설비 제어 시뮬레이션)

  • Chang, Hong-Soon;Han, Young-Sub;Soe, Sang-Hyun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.3
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    • pp.95-99
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    • 2013
  • The maximum power analysis simulator took advantage of the facilities and power consumption reduction simulator test scenario development and testing of improvement in the scenario. As a maximum demand power controller, Maximum power analysis simulator performs control and disperasion of maximum demand power by calculating base power, load forecast, and present power which are based on signal of watt-hour meter to keep the electricity under the target. In addition, various algorithms to select appropriate control methode on each of the light installations through the peak demand power is configured to management. The simulation shows the success of control power for the specified target controlled by five sequential lighting installations.

Steady-state Operational Strategies of UPFC in the KEPCO Transmission System

  • Chang, B.H.;Choo, J.B.;Xu, X.K.;Lam, B.P.
    • KIEE International Transactions on Power Engineering
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    • v.3A no.3
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    • pp.161-167
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    • 2003
  • This paper presents a study performed to investigate the steady-state operational strategies of UPFCs in the Jeollanam-Do system in Korea. The objective of the study was to determine the UPFC operating points under normal and contingency conditions. The study consists of developing load flow models to simulate different load levels with and without UPFCs in the system, assessing the effectiveness of UPFCs by contingency analysis, and introducing optimal corrective actions for removing voltage problems caused by contingencies. The paper describes analytical tools, models and approach. It also includes analysis and discussion of the study results. The paper contributes to the area of transmission operational studies with FACTS applications.

Severe Accident Analysis for Wolsung Nuclear Power Plants

  • Kwon, Jong-Jooh;Kim, Myung-Ki;Park, Byoung-Chul;Kim, Inn-Seock;Hong, Sung-Yull
    • Proceedings of the Korean Nuclear Society Conference
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    • 1997.05a
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    • pp.464-470
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    • 1997
  • Severe accident analysis has been performed for the Wolsung nuclear power plants in Korea to investigate severe accident phenomena of CANDU-600 reactors as a part of Level II PSA study. The accident sequence analyzed in this paper is loss of active heat sinks(LOAH) which is caused by loss of off-site power, diesel generators, and DC power. ISAAC (Integrated Severe Accident Analysis Code)computer code developed by KAERI (Korea Atomic Energy Research Institute) was used in this analysis. This paper describes the important thermal-hydraulics and source term behaviors in the primary system and inside containment, and the failure mechanism of calandria vessel and containment. In addition, some insights for accident management program(AMP) are also given.

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A study on comparative analysis of direct current control in A.C.-D.C. interconnected power system (교류-직류 연계계통에 있어서 직류제어방식의 비교연구)

  • 정형환;왕용필;안병철;이광우
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.45 no.4
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    • pp.474-483
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    • 1996
  • In this paper, as a part of the method improving stability, the load-flow calculation in D.C. power system and the models for stability analysis are studied with A.C-D.C. interconnected power systems transmission performed. Moreover, the theory is established in relation to each control method of D.C. power systems. Then the stability of A.C-D.C.interconnected power systems is compared and considered by the way of dividing the operating control method of the rectifier inverter converter into ACR-AVR, APR-A.gamma.R, A.alpha.R-ACR. The dynamics characteristic of terminal voltage, frequency, active-reactive power and rotor angle of the generator with disturbances and load fluctuations is considered. In addition, the characteristic of direct voltage, direct current, power and control systems. From this the comparative analysis of the direct current control method, the possibility of the stability analysis of A.C.-D.C. interconnected power system is considered. (author). refs., figs., tabs.

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A Study on the Economic Analysis of LNG Combined Cycle Thermal Power Plant in Cost Based Pool Electricity Markets (변동비반영 발전경쟁시장에서 LNG-복합 화력발전소의 경제성 분석에 관한 연구)

  • Lee, Cheon-Ho;Han, Seok-Man;Chung, Koo-Hyung;Kang, Dong-Ju;Kim, Bal-Ho H.
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.8
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    • pp.1327-1333
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    • 2008
  • Since Cost Based Pool markets has been continued to power markets, Genco. needs economic analysis about investment in power plants. Particularly most Private Genco.s have presently a construction plan about LNG combined cycle thermal power plants. In this paper, we propose a economic analysis method of LNG combined cycle thermal power plants using Economic Dispatch and Optimal Power Flow in CBP markets. Also we develope computation model using it for decision making to build a plant. This method can consider a variation of power facility like power plants and transmission lines in CBP markets. Finally, this dissertation provides a relevant case study to confirm the effect of cost factor to economical efficiency.

Big Data Analysis of Public Acceptance of Nuclear Power in Korea

  • Roh, Seungkook
    • Nuclear Engineering and Technology
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    • v.49 no.4
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    • pp.850-854
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    • 2017
  • Public acceptance of nuclear power is important for the government, the major stakeholder of the industry, because consensus is required to drive actions. It is therefore no coincidence that the governments of nations operating nuclear reactors are endeavoring to enhance public acceptance of nuclear power, as better acceptance allows stable power generation and peaceful processing of nuclear wastes produced from nuclear reactors. Past research, however, has been limited to epistemological measurements using methods such as the Likert scale. In this research, we propose big data analysis as an attractive alternative and attempt to identify the attitudes of the public on nuclear power. Specifically, we used common big data analyses to analyze consumer opinions via SNS (Social Networking Services), using keyword analysis and opinion analysis. The keyword analysis identified the attitudes of the public toward nuclear power. The public felt positive toward nuclear power when Korea successfully exported nuclear reactors to the United Arab Emirates. With the Fukushima accident in 2011 and certain supplier scandals in 2012, however, the image of nuclear power was degraded and the negative image continues. It is recommended that the government focus on developing useful businesses and use cases of nuclear power in order to improve public acceptance.

Extension of MARTE Profile for Model-based Power Consumption Analysis of Embedded Software with UML 2.0 (UML 2.0을 사용한 모델 기반의 임베디드 소프트웨어 소모 전력 분석을 위한 MARTE Profile의 확장)

  • Pyeon, Ho-Rim;Kim, Jong-Phil;Hong, Jang-Eui
    • Journal of KIISE:Software and Applications
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    • v.37 no.4
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    • pp.252-263
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    • 2010
  • The needs of low-power embedded software are being increased. Along with the needs, the studies to predict the power consumption of embedded software are also being increased. Although existing studies for power analysis have been performed in source code-based, these code-based analysis have some shortages of long analysis time and much feedback efforts. Recently some studies of power analysis based on software models are prompted. This paper describes on the model-based approach using UML diagrams in embedded software development process. Specially we focus on the extension of OMG's MARTE Profile to support model-based analysis. The MARTE extension gives the possibility of power analysis using just UML diagrams without any other analysis model in embedded software development.

Experiences with Simulation Software for the Analysis of Inverter Power Sources in Arc Welding Applications

  • Fischer W.;Mecke H.;Czarnecki T.K.
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.731-736
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    • 2001
  • Nowadays various simulation tools are widely used for the design and the analysis of power electronic converters. From the engineering point of view it is rather difficult to parameterize power semiconductor device models without the knowledge of basic physical parameters. In recent years some data sheet driven behavioral models or so called 'wizard' tools have been introduced to solve this problem. In this contribution some experiences with some user-friendly power semiconductor models will be discussed. Using special simulation test circuits it is possible to get information on the static and dynamic behavior of the parameterized models before they are applied in more complex schemes. These results can be compared with data sheets or with measurements. The application of these models for power loss analysis of inverter type arc welding power sources will be described.

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Comparison and Study of Active and Hybrid Power Filters for Compensation of Grid Harmonics

  • Gutierrez, Bryan;Kwak, Sang-Shin
    • Journal of Power Electronics
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    • v.16 no.4
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    • pp.1541-1550
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    • 2016
  • This paper presents a theoretical analysis and comparisons of active power filter (APF) and hybrid power filter (HPF) systems, given terminal constraints of harmonic compensations in nonlinear loads. Despite numerous publications for the two types of filters, the features and differences between them have not been clearly explained. This paper presents a detailed analysis of the operations of a HPF inverter along with those of passive power filters (PPFs). It also includes their effects on the power factor at the grid. In addition, a theoretical analysis and a systematic comparison between the APF and HPF systems are addressed based on system parameters such as the source voltage, output power, reactive component size, and power factor at the grid terminals. The converter kVA ratings and dc-link voltage requirements for both topologies are considered in the presented comparisons