• Title, Summary, Keyword: power quality assessment model

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Development of Intelligence Electric Power Quality Assessment Model (지능형 전기품질 평가모델 개발)

  • Lee, Buhm;Choi, Nam-Sup;Kim, Kyung-Min
    • Journal of Institute of Control, Robotics and Systems
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    • v.13 no.6
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    • pp.531-536
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    • 2007
  • This paper presents a power quality assessment model based on the Analytic hierarchy process. This model can assess unified power quality index which provide an overall performance of the distribution system. To obtain the unified power quality index, we propose the use of the AHP model which has three states: [Ideal]-[Actual]-[Worst]. The proposed method is especially useful and effective for planning. We have applied the proposed method to an actual relatively large system, and verified the usefulness.

-Reliability Assessment of Nuclear Power Plants Considering the Qualitative Factors under Uncertainty- (원자력발전소에서 정성적 요인을 고려한 신뢰성 평가)

  • 강영식
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.23 no.54
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    • pp.167-177
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    • 2000
  • The problem of system reliability is very important issue in the nuclear power plant, because the failure of its system brings about extravagant economic loss, environment destruction, and quality loss. This paper therefore proposes a normalized scoring model by the qualitative factors order to evaluate the robust reliability of nuclear power plants under uncertainty. Especially, the qualitative factors including risk, functional, human error, and quality function factors for the robust justification has been also introduced. Finally, the analytical reliability and safety assessment model developed in this paper can be used in the real nuclear power plant.

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The Study on the Improvement of Environmental Assessment Method through Analysis of Environmental Investigation Results of Taean Thermal Power Plant (환경영향평가와 사후환경조사의 비교에 관한 연구 - 태안화력발전소 사례분석 -)

  • Chun, Sang-Ki;Lee, Sung-Chul
    • Journal of Environmental Impact Assessment
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    • v.9 no.1
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    • pp.61-74
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    • 2000
  • This study compares the results of environmental impact assessment with the results of post-environmental investigation, using the case of Taean thermal power plant construction. The atmospheric and water qualities were not greatly changed before and after the construction of the power plant. However, the site of the highest concentration predicted by the atmospheric quality modeling in environmental impact assessment was different from that after operation of 4 power plants. There was also a difference in the diffusion range of thermal discharge water between the measured result(1km) and the predicted value(1.5km) with the model. Thus, environmental impact evaluation should be based on long-term (more than a year) environmental monitoring data. For the modeling of atmospheric quality and numerical thermal discharge water diffusion, appropriate models for each plant should be selected and the numerical modeling should be accompanied by computer simulation, wind tunnel test, etc. Moreover, environmental evaluation should focus more on the degree of impact on surroundings than the prediction of changes in surroundings caused by operation of plants.

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Voltage Sag Assessment Considering the Characteristics of Wind Power (풍력 발전 특성을 고려한 순간전압강하 평가)

  • Song, Young-Won;Park, Chang-Hyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.11
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    • pp.1571-1577
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    • 2012
  • This paper presents a method for assessing the voltage sag performance of power system involving wind power generation. Wind power generation is considered as one of the most desirable renewable energy sources. However, wind power generation have uncertain energy output and it is difficult to control the output. The existing methods of voltage sag assessment are not reflected the characteristics of wind power generation. Therefore, in order to more accurately assess the voltage sag performance, the probability of wind power operation is evaluated. In this paper, the probability is determined by combining the wind speed model with the output curve of wind turbine. The probability of wind power operation is reflected as a parameter in voltage sag assessment. The proposed method can provide more accurate results of voltage sag assessment for the case involving the wind power generation.

Countermeasure of Voltage Sag in Radial Power Distribution System using Load Transfer Switching (부하 절환 스위칭을 이용한 방사상 배전계통에서의 순간전압강하 대책)

  • Yun, Sang-Yun;Oh, Jung-Hwan;Kim, Jae-Chul
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.49 no.11
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    • pp.558-565
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    • 2000
  • In this paper, we propose a method for mitigating for mitigating the effect of voltage of voltage sag in radial power distribution systems using load transfer switching (LTS). The term of LTS is defined that the weakness load points for voltage sag transfer to the alternative source during the fault clearing practices. The sequenced of proposed LTS method is divided into the search of weakness points for voltage sag using the risk assessment model and transfer behavior of weakness points. The search of weakness point is carried out using the risk assessment model of voltage sag and Monte Carlo simulation method and the historical reliability data in Korea Electric Power Corporation (KEPCO) are also used. Through the case studies, we verify the effectiveness of proposed LTS method and present the searching method of effective application points of LTS method using the risk assessment model.

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A System Dynamics Model for Assessment of Organizational and Human Factor in Nuclear Power Plant (시스템 다이내믹스를 활용한 원전 조직 및 인적인자 평가)

  • 안남성;곽상만;유재국
    • Korean System Dynamics Review
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    • v.3 no.2
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    • pp.49-68
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    • 2002
  • The intent of this study is to develop system dynamics model for assessment of organizational and human factors in nuclear power plant which can contribute to secure the nuclear safety. Previous studies are classified into two major approaches. One is engineering approach such as ergonomics and probability safety assessment(PSA). The other is social science approach such like sociology, organization theory and psychology. Both have contributed to find organization and human factors and to present guideline to lessen human error in NPP. But, since these methodologies assume that relationship among factors is independent they don't explain the interactions among factors or variables in NPP. To overcome these limits, we have developed system dynamics model which can show cause and effect among factors and quantify organizational and human factors. The model we developed is composed of 16 functions of job process in nuclear power, and shows interactions among various factors which affects employees' productivity and job quality. Handling variables such like degree of leadership, adjustment of number of employee, and workload in each department, users can simulate various situations in nuclear power plant in the organization side. Through simulation, user can get insight to improve safety in plants and to find managerial tools in the organization and human side. Analyzing pattern of variables, users can get knowledge of their organization structure, and understand stands of other departments or employees. Ultimately they can build learning organization to secure optimal safety in nuclear power plant.

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Unified Reliability and Its Cost Evaluation in Power Distribution Systems Considering the Voltage Magnitude Quality and Demand Varying Load Model (전압 크기의 품질 및 전력수요 변동모델을 고려한 배전계통의 통합적인 신뢰도 및 비용 평가)

  • Yun, Sang-Yun
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.12
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    • pp.705-712
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    • 2003
  • In this paper, we propose new unified methodologies of reliability and its cost evaluation in power distribution systems. The unified method means that the proposed reliability approaches consider both conventional evaluation factor, i.e. sustained interruptions and additional ones, i.e. momentary interruptions and voltage sags. Because the three voltage quality phenomena generally originate from the outages on distribution systems, the basic and additional reliability indices are summarized considering the fault clearing mechanism. The proposed unified method is divided into the reliability evaluation for calculating the reliability indices and reliability cost evaluation for assessing the damage of customer. The analytic and probabilistic methodologies are presented for each unified reliability and its cost evaluation. The time sequential Monte Carlo technique is used for the probabilistic method. The proposed DVL(Demand Varying Load) model is added to the reliability cost evaluation substituting the average load model. The proposed methods are tested using the modified RBTS(Roy Billinton Test System) form and historical reliability data of KEPCO(Korea Electric Power Corporation) system. The daily load profile of the each customer type in domestic are gathered for the DVL model. Through the case studies, it is verified that the proposed methods can be effectively applied to the distribution systems for more detail reliability assessment than conventional approaches.

An Assessment Method for Voltage Sag in Power Distribution System using a Fuzzy Model (퍼지 모델을 이용한 배전 계통에서의 순간전압강하 평가 방식)

  • Yun, Sang-Yun;O, Jeong-Hwan;Kim, Eon-Seok;Kim, Nak-Gyeong;Kim, Jae-Cheol
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.49 no.4
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    • pp.177-184
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    • 2000
  • In this paper, we proposes a method for assessing the effect of voltage sag in power distribution systems using fuzzy model. The proposed method is based on the reliability data of distribution system and specified computer business equipment manufacturer association(SCBEMA) curve that express the representative power acceptability curve by voltage sag for each customer type. The SCBEMA curves are made by using the CBEMA curves obtained from the experiment for the customers sensitive equipment. In order to transform SCBEMA curves to the differential damage by voltage sag, a fuzzy model is used. The proposed fuzzy model is composed to reflect two parameters of customers damage by voltage sag. One is the duration and magnitude of voltage sag and the other is the different risk due to the customer types. The Monte Carlo simulation method and the historical reliability data in KEPCO ae used for case studies.

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Reliability Assessment by the Scoring Model for the Advanced Pressurized water Reactor 1400MWe Project Selection under Uncertainty (신형경수로 1400을 위해 점수산정 모형에 의한 신뢰성 평가)

  • 강영식
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.25 no.6
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    • pp.23-35
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    • 2002
  • The problem of system reliability is very important issue in the digitalized nuclear power plant, because the failure of its system brings about extravagant economic loss, environment destruction, and fatal damage of human. Therefore the purpose of this study has developed the reliability evaluation model through the scoring model by the quantitative and qualitative factors in order to justify the evaluation considering the advanced safety factors in the Advanced Pressurized water Reactor 1400MWe(APR 1400MWe) under uncertainty. Especially, the qualitative factors considering the human, information control, and quality factors for the systematic and rational justification have been closely analyzed. The proposed model can be simply applied in real fields in order to minimize the industrial accidents in the digitalized nuclear power plant.

The System Dynamics Model for Assessment of Organizational and Human Factor in Nuclear Power Plant (시스템 다이나믹스를 활용한 원전 조직 및 인적인자 평가)

  • 안남성;곽상만;유재국
    • Proceedings of the Korean System Dynamics Society
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    • pp.19-40
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    • 2002
  • The intent of this study is to develop system dynamics model for assessment of organizational and human factors in nuclear power plant which can contribute to secure the nuclear safety. Previous studies are classified into two major approaches. One is engineering approach such as ergonomics and probability safety assessment(PSA). The other is social science approach such like sociology, organization theory and psychology. Both have contributed to find organization and human factors and to present guideline to lessen human error in NPP. But, since these methodologies assume that relationship among factors is independent they don't explain the interactions among factors or variables in NPP. To overcome these limits, we have developed system dynamics model which can show cause and effect among factors and quantify organizational and human factors. The model we developed is composed of 16 functions of job process in nuclear power, and shows interactions among various factors which affects employees' productivity and job quality. Handling variables such like degree of leadership, adjustment of number of employee, and workload in each department, users can simulate various situations in nuclear power plant in the organization side. Through simulation, user can get insight to improve safety in plants and to find managerial tools in the organization and human side. Analyzing pattern of variables, users can get knowledge of their organization structure, and understand stands of other departments or employees. Ultimately they can build learning organization to secure optimal safety in nuclear power plant.

  • PDF