• Title/Summary/Keyword: Power System Analysis

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A Study on Multi Level Load Shedding Control Scheme Strategy for Stabilization of the Korean Power System (국내 전력계통 안정화를 위한 다단계 부하차단 제어전략 수립에 관한 연구)

  • Lee, Yun-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.65 no.4
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    • pp.255-261
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    • 2016
  • Korean Power System are operating a load shedding system to prevent voltage instability phenomenon caused by severe line contingencies. In order to apply the load shedding scheme should be selected a location, amount, delay time. Current load shedding system is load shedding amount that has been calculated in the steady-state analysis to load shed the total amount in first level, load shedding amount calculated in advance, it is possible to perform an unnecessary load shedding. In this paper, set a multi-level load shedding control strategy step-by-step selection of load shedding amount for the prevention of excessive load shedding. In addition, through a voltage resilience analysis of the power system by applying motor load ratio and sensitivity parameter to selection the multi level load shedding ratio and delay time. For this reason, to take advantage of the limit data of interchange power, by utilizing interface power flow data to set a multi-level load shedding control strategy for the stabilization of the Korean Power System.

Power Quality Analysis of Jeju Power System during HVDC Overhaul using PSCAD/EMTDC (PSCAD/EMTDC에 의한 직류연계선 오버홀시 제주계통의 전력품질 분석)

  • Kang, Bo-Seung;Kim, Jae-Hong;Kim, Eel-Hwan;Kim, Se-Ho;Oh, Seong-Bo;Song, Ki-Heouk
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.82-84
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    • 2008
  • This paper presents the modeling and power quality analysis of Jeju island power system connected with wind farm, and thermal power plant. It is for indicating the influence of wind farm operation in steady and transient state in Jeju island power system during the HVDC system overhaul period. For the computer simulation, three kinds of main item are modeled, which are 67[MW] wind farm, thermal power plant and Jeju power load. To analyze the influence of the wind power generation to the Jeju power system, two kinds of simulations are carried out by using the PSCAD/EMTDC program. One is the steady state operation under the variable speed wind, and the other is the transient state operation when all of wind farms in Jeju island are disconnected from the Jeju power grid instantaneously on the rated power output. With the comparison of these results, it is useful for analyzing the power quality of Jeju power system versus wind power generation.

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Design and analysis of a free-piston stirling engine for space nuclear power reactor

  • Dai, Zhiwen;Wang, Chenglong;Zhang, Dalin;Tian, Wenxi;Qiu, Suizheng;Su, G.H.
    • Nuclear Engineering and Technology
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    • v.53 no.2
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    • pp.637-646
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    • 2021
  • The free-piston Stirling engine (FPSE) has been widely used in aerospace owing to its advantages of high efficiency, high reliability, and self-starting ability. In this paper, a 20-kW FPSE is proposed by analyzing the requirements of space nuclear power reactor. A code was developed based on an improved simple analysis method to evaluate the performance of the proposed FPSE. The code is benchmarked with experimental data, and the maximum relative error of the output power is 17.1%. Numerical results show that the output power is 21 kW, which satisfies the design requirements. The results show that: a) reducing the pressure shell's thickness can improve the output power significantly; b) the system efficiency increases with the wire porosity, while the growth of system efficiency decreases when the porosity is higher than 80%, and system efficiency exhibits a linear relationship with the temperatures of the cold and hot sides; c) the system efficiency increases with the compression ratio; the compression ratio increases by 16.7% while the system efficiency increases by 42%. This study can provide valuable theoretical support for the design and analysis of FPSEs for space nuclear power reactors.

POWER SYSTEM STABILITY ANALYSIS ON PETROCHEMICAL PLANT;MEXICO CADEREYTA CASE (석유화학공장의 전력계통 안정도 해석;맥시코 카데래이타 경우)

  • Kim, Bong-Hee
    • Proceedings of the KIEE Conference
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    • 1999.07c
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    • pp.1224-1226
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    • 1999
  • When electrical engineers get started with the design of main electrical system of a complex petrochemical plant along with chemical and mechanical engineers, they are usually confronted with lack of power system data. This paper presents a procedure how to perform power system stability analysis for the purpose of design studies within the limited system data given and to verify the given data to get reliable convergence in dynamic simulation as well as to apply the stability analysis result on practical system design. The power system stability analysis on the Cadereyta petrochemical plant in Mexico is provided as a study case.

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A Study on Frequency Simulator Design for Load Following Test of Generator (발전기 부하추종성 시험용 주파수 Simulator 설계에 관한 연구)

  • Kwak, Wol-Hwan;Lee, Gang-Wan;Oh, Chang-Soo
    • Proceedings of the KIEE Conference
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    • 2004.11b
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    • pp.138-142
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    • 2004
  • Recently over dropped frequencies of power system were recorded when power system was unbalanced between generation and demand. Therefore load following characteristic analysis of thermal and combined cycle power plant generators is necessary for low frequency condition analysis of power system. Frequency simulator supplies simulated frequency to the online generator for prescribed goal. This simulator needs to minimize effects to power system and requires stability first. This paper introduces design and manufacturing case of frequency simulator for load following characteristic analysis of generators.

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Harmonic State Estimation in Power System (전력시스템 고조파 상태 추정에 관한 연구)

  • Park, H.C.;Lee, J.P.;Wang, Y.P.;Chong, H.H.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.05a
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    • pp.117-120
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    • 2002
  • Electrical power system has very complexity problem that it is plan measurement system to achieve Harmonic State Estimation (HSE). This complexity problem depends on discord of necessary accuracy, certainty of noise that exist in data communication damage and converter, adaptability of network modification and minimum of expense size of system, estimated monitering. Also, quantity of available measurement equipment for harmonic measurement has been limited. Therefore, systematic method that choose measurement location for harmonic state estimation. This paper is that see proposed HSE that use Observability Analysis(OA) for harmonic state estimation of electrical power system. OA depends on measurement number, measurement location and measurement form here, it is analysis method that depend on network form and admittance of the system. OA used achieve harmonic state estimation that it is Applied to New Zealand electrical power system to prove validity of HSE algorithm that propose. This study result about harmonic state estimation of electrical power system displayed very economical and effective method by OA.

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A Study on the Data Aquisition System for Power Quality Analysis of Load Equipment (부하설비의 전력품질 분석을 위한 데이터 획득시스템에 관한 연구)

  • Yu, Jae-Geun;Lee, Sang-Ik;Choe, Gyu-Ha
    • Proceedings of the KIPE Conference
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    • 2007.07a
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    • pp.92-94
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    • 2007
  • In order to analyze voltage, current, electrical power, harmonics and so on of electrical load equipments, electrical power analysis by real measurement rather than mathematical modeling is necessary, and plan of countermeasure for efficient management, energy frugality and accident prevention of electrical equipments using it is possible. Especially, electrical power analysis by real measurement is indispensable in order to consider countermove of harmonic occurred by nonlinear load. So, in this paper, we developed DSP(Digital Signal Processor) based low price date aquisition system, and verified it's ability by performing measurement and analysis of electrical power and harmonic in the real power system.

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Line Impedance Analysis of Underground Cable in Power Plant (발전소에 포설된 케이블 선로 임피던스 분석)

  • Ha, C.W.;Han, S.H.
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.612-613
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    • 2007
  • The line impedance is important data that are applied in all analysis fields of electric power system such as power flow, fault current, stability and relay calculation etc. Usually, the impedance can be accurately calculated in case of overhead line. However, in case of power cables or combined transmission lines, the impedance can not be accurately calculated because cable systems have the sheath, grounding wires, and earth resistances. Therefore, if there is a fault in cable system, these terms will severely be caused many errors for calculating impedance. In this paper, the line impedance is measured in a power system of underground cables, and is analyzed by a generalized circuit analysis program, EMTP(Electromagnetic Transient Program), for comparison with the measured value. These analysis results are considered to become foundation of impedance calculation for underground cables.

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A Study on the Power System Stabilizer Design using Object-Oriented Method (객체지향기법을 적용한 PSS 설계에 관한 연구)

  • Park, Ji-Ho;Baek, Young-Sik
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.48 no.6
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    • pp.671-677
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    • 1999
  • In this paper, we have designed power system stabilizer (PSS) using object-oriented method. There are several types of power system stabilizer. A proportional-integral(PI) controller is very simple for practical implementation. Therefore it has been widely employed by the industry. The methods of obtaining the gains(Ki,Kp) of PI controller are root-locus method and sub-optimal regulator approach. But these methods are cannot be applicable to nonlinear system and faulted power system. So we proposed a new method which can be applied to nonlinear system by numerical analysis method. The method of dynamic system simulation by numerical method is very difficult and complex. We proposed flexible simultaion method for complex power system analysis using object-oriented programming(OOP) and applied to PI controller design.

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