• Title/Summary/Keyword: Power and Economic Simulation

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A Basic Study on Relationship between Reliability and Congestion Cost of Composite Power System (복합전력계통의 신뢰도와 혼잡비용과의 상관관계성에 관한 기초 연구)

  • Choi, J.S.;Tran, T.T.;Kwon, J.J.;Jeong, S.H.;Bo, Shi;Mount, Timothy;Thomas, Robert
    • Proceedings of the KIEE Conference
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    • 2006.11a
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    • pp.275-278
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    • 2006
  • This paper describes a probabilistic annual congestion cost assessment of a grid at a composite power system derived from a model. This probabilistic congestion cost assessment simulation model includes capacity limitation and uncertainties of the generators and transmission lines. In this paper, the proposed probabilistic congestion cost assessment model is focused on an annualized simulation methodology for solving long-term grid expansion planning issues. It emphasizes the questions of "how should the uncertainties of system elements (generators, lines and transformers, etc.) be considered for annual congestion cost assessment from the macro economic view point"? This simulation methodology comes essentially from a probabilistic production cost simulation model of composite power systems. This type of model comes from a nodal equivalent load duration curve based on a new effective load model at load points. The characteristics and effectiveness of this new simulation model are illustrated by several case studies of a test system.

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Research on Line Overload Emergency Control Strategy Based on the Source-Load Synergy Coefficient

  • Ma, Jing;Kang, Wenbo;Thorp, James S.
    • Journal of Electrical Engineering and Technology
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    • v.13 no.3
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    • pp.1079-1088
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    • 2018
  • A line overload emergency control strategy based on the source-load synergy coefficient is proposed in this paper. First, the definition of the source-load synergy coefficient is introduced. When line overload is detected, the source-load branch synergy coefficient and source-load distribution synergy coefficient are calculated according to the real-time operation mode of the system. Second, the generator tripping and load shedding control node set is determined according to the source-load branch synergy coefficient. And then, according to the line overload condition, the control quantity of each control node is determined using the Double Fitness Particle Swarm Optimization (DFPSO), with minimum system economic loss as the objective function. Thus load shedding for the overloaded line could be realized. On this basis, in order to guarantee continuous and reliable power supply, on the condition that no new line overload is caused, some of the untripped generators are selected according to the source-load distribution synergy coefficient to increase power output. Thus power supply could be restored to some of the shedded loads, and the economic loss caused by emergency control could be minimized. Simulation tests on the IEEE 10-machine 39-bus system verify the effectiveness and feasibility of the proposed strategy.

Critical Short Circuit Ratio Analysis on DFIG Wind Farm with Vector Power Control and Synchronized Control

  • Hong, Min;Xin, Huanhai;Liu, Weidong;Xu, Qian;Zheng, Taiying;Gan, Deqiang
    • Journal of Electrical Engineering and Technology
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    • v.11 no.2
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    • pp.320-328
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    • 2016
  • The introduction of renewable energy sources into the AC grid can change and weaken the strength of the grid, which will in turn affect the stability and robustness of the doubly-fed induction generator (DFIG) wind farm. When integrated with weak grids, the DFIG wind turbine with vector power control often suffers from poor performance and robustness, while the DFIG wind turbine with synchronized control provides better stability. This paper investigates the critical short circuit ratios of DFIG wind turbine with vector power control and synchronized control, to analyze the stability boundary of the DFIG wind turbine. Frequency domain methods based on sensitivity and complementary sensitivity of transfer matrix are used to investigate the stability boundary conditions. The critical capacity of DFIG wind farm with conventional vector power control at a certain point of common coupling (PCC) is obtained and is further increased by employing synchronized control properly. The stability boundary is validated by electromagnetic transient simulation of an offshore wind farm connected to a real regional grid.

Modeling of Unified Power Flow Controllers Using a Current Injection Method for Transient Stability Analysis (전류 주입형 방식의 UPFC 모델을 이용한 과도 안정도 해석)

  • Kim, Chon-Hoe;Park, Jung-Soo;Jang, Gil-Soo;Son, Kwang-M.;Kim, Tae-Kyun
    • Proceedings of the KIEE Conference
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    • 2005.07a
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    • pp.332-334
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    • 2005
  • This paper presents a dynamic simulation of the unified power flow controller (UPFC) using a current injection method. Flexible AC Transmission System (FACTS) devices give more flexibility of control for security and economic operation of power systems. Diffculties of modeling UPFC in the conventional dynamic simulation programs arise from the fact that the injected voltage by the series inverter is superimposed on the shunt inverter side voltage. A solution can be a current injection method, in which a serial part of UPFC is converted to a parallel equivalent circuit using source transformation, and two current sources affect each other at every time step. To verify efficiency of this method, the proposed model is applied for the transient analysis of an example power system.

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The Coordination Control of DC Microgrid on the Whole Operation Range (직류형 마이크로그리드의 전운전영역을 고려한 협조제어)

  • Choi, Daehee;Zhu, Shou-Zhen;Min, Yong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.6
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    • pp.864-871
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    • 2015
  • Recently, one of the main research on the power distribution system is the microgrid. The microgrid is a combination of power sources and loads, which is controllable and has separable connection. The main objective of microgrid is the deployment of the renewable clean energy and the enhancement of load-side reliability. The modern power sources and loads have DC I/O interfaces, which is the major advantage of DC microgrid compared to the conventional AC grid. The components in the microgrid have diverse features, so there is need of proper coordination control. For achieving economic feature, the active power of renewable energy resources is regarded as major control parameter and the whole operation modes of DC microgrid are defined, and the proper operations of each component are described. From the inherent characteristics of DC, there are two control variables: voltage and active power. Through analysis of operation modes, it is possible to determine exact control objectives and optimized voltage & power control strategy in each mode. Because of consideration of whole operation modes, regardless of the number and capacity of components, this coordination control method can be used without modification. This paper defines operation mode of DC microgrid with several DC sources and suggests economic and efficient coordinated control methods. Simulation with PSCAD proves effectiveness.

A Study on Requirement of Nuclear Power Plant Load Following Operation Condition Considering Power System Security (계통 안전성을 고려한 원자력발전의 부하추종 요건연구)

  • Lee, Hyun-Chul;Baek, Young-Sik;Lee, Geun-Joon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.11
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    • pp.1565-1570
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    • 2012
  • Nuclear power generation is increasing domestic power supply ratio by lower CO2 emission and fuel prices. Currently, nuclear power generator has been operated with maximum power output. Therefore, nuclear power generator could be no effect to managing the reactive power reserve on power system. The reactive power reserve is calculated to the difference between maximum facility and operation generation capacity of the power system. This paper was proposed that load following of nuclear power is control by using 15-bus power system model. In the simulation result, power system is shown to safety state by operating load following of nuclear power generator. This method has be improved the supplied reliability through economic and efficient operation.

Optimal DG Placement in a Smart Distribution Grid Considering Economic Aspects

  • Buaklee, Wirote;Hongesombut, Komsan
    • Journal of Electrical Engineering and Technology
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    • v.9 no.4
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    • pp.1240-1247
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    • 2014
  • The applications of Distributed Generation (DG) in a smart distribution grid environment are widely employed especially for power balancing and supporting demand responses. Using these applications can have both positive and negative impacts on the distribution system. The sizing and location of their installations are the issues that should be taken into consideration to gain the maximum benefit from them when considering the economic aspects. This paper presents an application of the Bat Algorithm (BA) for the optimal sizing and siting of DG in a smart distribution power system in order to maximize the Benefit to Cost Ratio (BCR), subjected to system constraints including real and reactive power generation, line and transformer loading, voltage profile, energy losses, fault level as well as DG operating limits. To demonstrate the effectiveness of the proposed methodology and the impact of considering economic issues on DG placement, a simplify 9-bus radial distribution system of the Provincial Electricity Authority of Thailand (PEA) is selected for the computer simulation to explore the benefit of the optimal DG placement and the performance of the proposed approach.

Evaluation of Korea\`s Sustainable Development by the System Ecology(II) -Simulating the Future of Korea\`s Natural Environment and Economic Development- (시스템 생태학적 접근법에 의한 한국의 지속적인 발전가능성 평가(II) -한국의 자연환경과 경제활동에 대한 미래예측-)

  • 이석모;손지호;김진이
    • Journal of Environmental Science International
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    • v.10 no.2
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    • pp.91-97
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    • 2001
  • A macroeconomic minimodel was simulated to analyze the effect of global exchange on the Korea\\`s economy. The simulation results illustrate some of the consequences of public policy and some insight into current world problems. All computer simulation runs made under various conditions suggest that the Korea\\`s system in the near future may be strongly influenced by the favorable availability of outside resources, while the national power and assets may be declined by indigenous environmental stock depletion. The borrowed capital allows the temporary money stock to increase and the national assets to grow faster and a little higher, as using up the environmental resources more quickly. Later, when the debt is paid off, the foreign exchange holdings may not go so high. For the environmentally sound and sustainable development, over 75% of total economic production should be invested to the natural resource management. Therefore, the economic structure of Korea should be transferred from the present industrial structure to social-economic structure based on ecological-recycling concept.

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A Study on the Effect of the Use of Reserve Officers on the Military (예비역 간부 활용이 군에 미치는 효과 연구)

  • Han, Bongkyu;Yang, Gumyong;Kim, Gakgyu
    • Journal of the Korea Institute of Military Science and Technology
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    • v.23 no.2
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    • pp.147-158
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    • 2020
  • Korea Ministry of National Defense has directed the state-of-the-art technology Forces troops structures that can respond to security threats in all directions through the Defense Innovation 2.0, which aims to reorganize the personnel and organizations in response to population decline. An implement of effective analysis to maintain combat power is necessary due to possible restrictions on combat power, especially in division of mobilization where reserve manpower is operated frequently. In this study, the normal operations of the reserve officers were investigated, the direct effects of the combat forces of the reserve officers was analyzed using ARENA modeling, and the budget required to operate the innovation and indirect effects of employment of veterans were studied. The result of the simulation proved to be effective in demonstrating unit combat power when the reserve officer was in full-time operations and economic benefits were also significant in terms of efficiency of defense budget management.

A Study on the Application of Hopfield Neural Network to Economic Load Dispatch (홉필드 신경회로망의 전력경제급전에의 응용에 관한 연구)

  • 엄일규;김유신;박준호
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.41 no.1
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    • pp.1-8
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    • 1992
  • Hopfield neural network has been applied to the problem of economic load dispatch(ELD) of electric power. The optimum values of neuron potentials are represented in terms of large numbers. The differential synchronous transition mode is used in this simulation. Through case studies, we have shown the possibility of the application of neural network to ELD. In case of including the transmission losses, the proposed method has an advantage that the problem can be solved simply with one neural network, without calculating incremental fuel costs and incremental losses required by traditional method.