• Title, Summary, Keyword: Power flow analysis

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A Study on Power-Flow Analysis of The Lepelletier 6-Speed Automatic Transmission (6 속 자동변속기용 레펠레티아 유성 치차의 동력 해석에 관한 연구)

  • 박진홍;심재경;강봉수
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.652-655
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    • 2004
  • In gear-train design, power-flow analysis is a very important process. The method for power-flow analysis apply the power balance equation and torque balance equation to each fundamental circuit. Then, the equation are solved simultaneously to determine the power-flow in planetary gear train. In this paper we perform power-flow analysis of a 6-speed automatic transmission. With this results are used to represent block diagram. In addition, the efficiencies of epicyclic inversion of the 6-speed automatic transmission is obtained.

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Estimation of Distributed and Joint-excited Input Power for Power Flow Analysis (파워흐름해석을 위한 분포가진 및 연결부 가진의 입력파워추정 연구)

  • Kim, Dong-Jin;Hong, Suk-Yoon
    • Journal of the Society of Naval Architects of Korea
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    • v.43 no.5
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    • pp.597-603
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    • 2006
  • The estimations of distributed and joint-excited input power for Power Flow Analysis are accomplished in this paper. Using Fourier transform, the displacements of infinite structures are derived, and the input power of distributed excitation can be estimated. The obtained results compare the real input power with the estimation of input power. When the exciting force acts on the joint of coupled structures, it is estimating the power that is transferred to each structure. Appling this input power, the results of energy density and intensity of Power Flow Analysis can be compared with the classical solutions.

HYBRID POWER FLOW ANALYSIS USING SEA PARAMETERS

  • Park, Y.H.;Hong, S.Y.
    • International Journal of Automotive Technology
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    • v.7 no.4
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    • pp.423-439
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    • 2006
  • This paper proposes a hybrid analytic method for the prediction of vibrational and acoustic responses of reverberant system in the medium-to-high frequency ranges by using the PFA(Power Flow Analysis) algorithm and SEA(Statistical Energy Analysis) coupling concepts. The main part of this method is the application of the coupling loss factor(CLF) of SEA to the boundary condition of PFA in reverberant system. The hybrid method developed shows much more promising results than the conventional SEA and equivalent results to the classical PFA for various damping loss factors in a wide range of frequencies. Additionally, this paper presents applied results of hybrid power flow finite element method(hybrid PFFEM) by formulating the new joint element matrix with CLF to analyze the vibrational responses of built-up structures. Finally, the analytic results of coupled plate structures and an automobile-shaped structure using hybrid PFFEM were predicted successively.

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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Improvement of the Power Flow Convergency Using Switched Shunt Reactive Power Sensitivity (Switched Shunt의 무효전력 민감도를 이용한 조류계산 수렴성 개선)

  • Oh, Sung-Kyun;Yang, Min-Yuk;Kim, Kern-Joong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.3
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    • pp.355-360
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    • 2012
  • It is difficult to converge power flow for the power system planning data. The main cause of power flow diverse is reactive power imbalance. A active power could be adjust by ELD or merit order but a reactive power couldn't dispatch before power flow analysis. The lack of reactive power of power system is cause a inadequate voltage drop This paper suggest new reactive power dispatch algorithm using switched shunt admittance. This algorithm uses reactive power sensitivity called switch shunt jacobian. When proposed algorithm applies to real system data that couldn't be conversed in PSS/E the power flow analysis is converged.

Flow Analysis of the Environmental Chemical Reaction Processes at Power Plant in accordance with the Baffle Structure

  • Jeong, Yeon-Tae;Hur, Kwang-Beom;Gil, Joon-Woo
    • KEPCO Journal on Electric Power and Energy
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    • v.2 no.3
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    • pp.433-436
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    • 2016
  • In the area of environmental chemistry of power plant, flow analysis of the reactor with built-in impeller is a very important part from the perspective of the improvement of the efficiency of the entire process. As a wide range of methods are being proposed for the analysis of the flow pattern within the reactor, this study analyzed the flow within the reactor according to the baffle structure (height) installed on the internal wall of the reactor in order to improve the reaction efficiency through the inducing of the up and down stirring with the reactor. As the results of the execution of the flow analysis for each of a diverse range of cases by utilizing the Computational Fluid Dynamics (CFD) method, it was possible to confirm that the flow is markdely improved by inducing the up and down stirring among the reactants within the reactor if the baffle is elevated to the level below the water surface. In particular, as the results of the analysis of the general cases in which the baffle is elevated all 4 steps and the cases in which the baffle is elevated only 2 steps, elevating the baffle only 2 steps achieve the same effect as the elevating of the baffle by 4 steps. Therefore, it was possible to expect to improve the efficiency with out the need to increase the use of electric power substantially if the outcomes of this study is applied to the actual sites of power plants in the future.

Hybrid Type Vibration Power Flow Analysis Method Using SEA Parameters

  • Park, Young-Ho;Hong, Suk-Yoon
    • The Journal of the Acoustical Society of Korea
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    • v.21 no.4E
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    • pp.164-169
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    • 2002
  • This paper proposes a hybrid method for vibration analysis in the medium to high frequency ranges using Power Flow Analysis (PFA) algorithm and Statistical Energy Analysis (SEA) coupling concepts. The main part of the developed method is the application of coupling loss factor (CLF) suggested in SEA to the power transmission, reflection coefficients in PI' A boundary conditions. The developed hybrid method shows very promising results with regard to the applications for the various damping loss factors in wide frequency ranges. And also this paper presents the applied results of Power Flow Finite Element Method (PFFEM) by forming the new joint element matrix with CLF to analyze the various plate structures in shape. The analytical results of automobile, complex plate structures show good agreement with those of PFFEM using the PFA coefficients.

Determination of Reactive Power Compensation Considering Large Disturbances for Power Flow Solvability in the Korean Power System

  • Seo, Sang-Soo;Kang, Sang-Gyun;Lee, Byong-Jun;Kim, Tae-Kyun;Song, Hwa-Chang
    • Journal of Electrical Engineering and Technology
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    • v.6 no.2
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    • pp.147-153
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    • 2011
  • This paper proposes a methodology using a tool based on the branch-parameter continuation power flow (BCPF) in order to restore the power flow solvability in unsolvable contingencies. A specified contingency from a set of transmission line contingencies is modeled, considering the transient analysis and practice in the Korean power system. This tool traces a solution path that satisfies the power flow equations with respect to the variation of the branch parameter. At a critical point, in which the branch parameter can move on to a maximum value, a sensitivity analysis with a normal vector is performed to identify the most effective compensation. With the sensitivity information, the location of the reactive power compensation is determined and the effectiveness of the sensitivity information is verified to restore the solvability. In the simulation, the proposed framework is then applied to the Korean power system.

Research on flow characteristics in supercritical water natural circulation: Influence of heating power distribution

  • Ma, Dongliang;Zhou, Tao;Feng, Xiang;Huang, Yanping
    • Nuclear Engineering and Technology
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    • v.50 no.7
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    • pp.1079-1087
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    • 2018
  • There are many parameters that affect the natural circulation flow, such as height difference, heating power size, pipe diameter, system pressure and inlet temperature and so on. In general analysis the heating power is often regarded as a uniform distribution. The ANSYS-CFX numerical analysis software was used to analyze the flow heat transfer of supercritical water under different heating power distribution conditions. The distribution types of uniform, power increasing, power decreasing and sine function are investigated. Through the analysis, it can be concluded that different power distribution has a great influence on the flow of natural circulation if the total power of heating is constant. It was found that the peak flow of supercritical water natural circulation is maximal when the distribution of heating power is monotonically decreasing, minimal when it is monotonically increasing, and moderate at uniform or the sine type of heating. The simulation results further reveal the supercritical water under different heat transfer conditions on its flow characteristics. It can provide certain theory reference and system design for passive residual heat removal system about supercritical water.

Northeast Asia Interconnection, and Power Flow Analysis Considering Seasonal Load Patterns

  • Lee, Sang-Seung;Kim, Yu-Chang;Park, Jong-Keun;Lee, Seung-Hun;Osawa, Masaharu;Moon, Seung-Il;Yoon, Yong-Tae
    • Journal of Electrical Engineering and Technology
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    • v.2 no.1
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    • pp.1-9
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    • 2007
  • This paper presents the effects of an increase or a decrease of a power reserve by load flow calculations under the seasonal load patterns of each country for the future power shortages faced by the metropolitan areas or by the southeastern area of South Korea in North-East Asia. In this paper, the various cases of the power system interconnections in Far-East Asia are presented, and the resulting interconnected power systems are simulated by means of a power flow analysis performed with the PSS/E 28 version tool. Data for simulation were obtained from the 2-th long term plan of electricity supply and demand in KEPCO. The power flow map is drawn from simulated data and the comparative study is done. In the future, a power flow analysis will be considered to reflect the effects of seasonal power exchanges. And the plan of assumed scenarios will be considered with maximum or minimum power exchanges during summer or winter in North-East Asian countries.