• The Transactions of the Korean Institute of Electrical Engineers
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• v.45 no.4
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• pp.467-473
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• 1996

This Paper presents a new algorithm to solve Dynamic Economic Dispatch problem. Proposed algorithm is composed of two computational modules; one is dispatch, the other adjusting module. In the dispatch module based on the traditional Static Economic Dispatch method, the power dispatch of each unit is calculated. And in case the results of dispatch module violate ramp rate constraints, Lagrange multipliers are adjusted in the adjusting module. Tests and computer results on test systems are given to show the efficiency of the proposed algorithm. (author). 11 refs., 6 figs., 4 tabs.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.55 no.11
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• pp.498-504
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• 2006

This paper describes the simple payback period analysis of small co-generation system based on the existing apartment and building data. First, We investigate apartment and building data more than $2000[m^2]$ using Ministry of Construction & Transportation's computer system. And then we calculate the latent amount of small co-generation system considering gas company and CHP. Second, we classify the latent amount of small co-generation system into office, hospital, hotel, department store, complex building and apartment. Finally, we perform the simple payback period analysis for small co-generation system. The results show the simple payback period of small co-generation system is less then 10 years.

• Proceedings of the KIEE Conference
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• 1996.07b
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• pp.701-703
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• 1996

Maintenance scheduling plays an important role in evaluating the supply reliability of power systems. Since generating units must be maintained and inspected, the generation planner must schedule planned outages during the year. Several factors entering into this scheduling analysis include: seasonal load-demand profile, amount of maintenance to bo done on all generating units, size of the units, elapsed time from last maintenance, and availability of maintenance crews. This paper proposes a new algorithm to decide the multi-year maintenance scheduling with considering the total cost. We adjust the maintenance scheduling to levelize the reliability over all period. The proposed algorithm is applied to a real size power system and the developed reliability results are obtained.

• Proceedings of the KIEE Conference
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• 2003.11a
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• pp.233-235
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• 2003

This paper describes a new methodology to get pareto-optimal generation planning for decision-making. To get optimal generation planning consider total quantity of contamination for the specified term, authors employ dynamic programming. And, in the course of dynamic programming, pareto optimal solution can be obtained. So, a most proper solution can be selected by derision-maker. The usefulness is verified by applying It to the test system.

• Proceedings of the KIEE Conference
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• 1993.07a
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• pp.102-105
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• 1993

The objective of this study is to solve the operation scheduling problem of plural battery energy storage systems (BESS), and to find useful intonation from its result. Unlike conventional energy storage system, BESS has on hardware characteristics such as high efficiency, fast-acting response and operational loss. Considering rate constraints of thermal unit power as well as hardware characteristics of BESS, the operation scheduling has an intricated problem. In order to solve this optimization problem, we use successive approximations dynamic programming. In two types of operation, the proposed algorithm is applied to test system. one is daily optimal operation, the other weekly optimal operation.

• Proceedings of the KIEE Conference
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• 1993.07a
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• pp.117-119
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• 1993

This paper presents a new method for solving unit commitment problem including hydro and pumped storage hydro units in a large scale power system. The proposed method makes it possible to get variable power of hydro and pumped storage hydro units and results in the better unit commitment with good convergency. Moreover this paper proposes an unit commitment algorithm to consider variable power of these units effectively by Lagrangian Relaxation method. By applying the proposed method to the test system, it is verified the usefulness of this method.

• Proceedings of the KIEE Conference
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• 1993.07a
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• pp.177-179
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• 1993

Best generation mix belongs to a multi attribute decision making, because we should consider many uncertain factors and choose the best one of the alternatives. Sugeno's fuzzy integral has been used as the solution of multi attribute decision making, but the exact value of the coefficient $\lambda$ hat not known yet which is needed to calculate fuzzy measure. This paper proposes the new method to calculate fuzzy measure without fixing the value of $\lambda$. The proposed method considers $\lambda$ as a probability distribution function and calculated expectation of fuzzy measure. The method is applied to the test system and the validity of the method is verified.

• Proceedings of the KIEE Conference
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• 2003.11a
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• pp.50-53
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• 2003

This Paper proposes the new method of Nodal Price calculation on nonoptimal condition of power system. It uses Power Flow instead of Optimal Power Flow. We propose a idea of imaginary constraints at the first. And the proposed method is applied to IEEE-30 and results show the effectiveness of the method.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1999.11a
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• pp.113-118
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• 1999

배전계통의 신뢰도를 계산하는 기법은 Roy Billinton 등에 의해 연구되어 왔으며, 이중 방사상계통에 대한 신뢰도는 PSS/U와 같은 상용소프트웨어를 사용하여 용이하게 계산할 수 있단. 그러나, 루프나 병렬회로를 포함하는 배전계통에 대한 신뢰도는 개개의 계통에 대한 모델을 각기 구성하여야하는 어려움이 있어, 아직까지 일반화되지 못하고 있다.(중략)

• Bulletin of the Korean Space Science Society
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• 2010.04a
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• pp.29.3-29.3
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• 2010

남극세종기지 상공 중간권계면에서의 중량파(gravity wave)를 연구하기 위해 세종기지 유성 레이더로 관측한 유성 에코를 분석하였다. 2007년 이후 유성 에코의 공간적 이동으로부터 유성 관측 고도에서의 수평 바람 정보를 지속적으로 수집해왔다. 80-100 km 고도에서의 바람 프로파일에서 지구 규모의 성분인 평균 바람(Mean wind), 대기 조석 효과(Tides)를 제거하여 국지적인 규모의 중량파에 의한 바람 변화폭(wind variance)을 결정하였다. 월 단위로 평균한 결과로부터 중량파가 계절과 고도에 대한 뚜렷한 특징을 보이고 있음을 확인하였다. 남극 지역에서의 중량파는 동서방향의 바람(zonal wind)와 저층 대기의 남극 소용돌이(vortex)와 깊은 관련이 있을 것으로 생각된다. 남극 반도에 위치한 Rothera 기지에서의 관측 결과와의 비교를 통하여, 남극 반도에서 발생하는 중량파가 중간권과 저층 대기 사이에서 어떤 역할을 하는 지를 확인할 수 있을 것으로 기대한다.