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다중슬랙모선 전력조류계산법과 행렬의 반복계산식을 이용한 효율적인 상정사고 해석
심건보,이봉용 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.5 No.-
Contingency analysis requires usually many simulations in order to identify weak points in the system. Often it is time conusming although its results may be exact. This paper suggests a quite simple and efficient method with the matrix iterative techniques. Bus power equations are changed so that state quantities such as voltage magnitudes and angles can be found easily after assumed contingencies. Efficiency comparison shows that the suggested method is quite superior, 7 and 192 times better efficiencies than DC load flow and AC load flow, respectively are expected in n=100 scale system. Particulary, usual one-slack load flow is avoided to get more realistic results. Multi-slack bus load flow is introduced.
李鳳容,沈建輔 弘益大學校 1990 弘大論叢 Vol.22 No.2
Traditionally the reliability index for generation planning has been used 0.7[days/year] in LOLP in this country. However, it seems to be time that the index should be reexamined as the scale of the power system has been grown remarkably during past decades. Reliability expression by LOLP may not be enough since it lacks information of such as severity of supply shortage. It can be complemented by other indexes, but these are not widely used due to their complication. This paper presents a result how supply shortage costs influence reserve levels of generation planning and that the appropriate level has been tried to be determined from those influences. New reliability index is suggested.
李鳳容,沈建輔 弘益大學校 1987 弘大論叢 Vol.19 No.2
A new probabilistic production costing simulation models have been developed based on the real economic load dispatch. Existing methodologies are based on the zero or maximum output in case of on-off two-state model, achieving only approximate economic loadings. Since the production costing is one of the most important part in the power system planning and operation, the model refinements are continuously required. The best model must be able to simulate the real world exactly and the computing efficiencies are also reasonable. In this sense, existing models can be said to be only approximate. The one using Monte-Carlo simulation may be exact, but the computing effort is generally tremendous. This paper proposes a new concept for the probabilistic production costing simulation. The key idea lies an the fact that the real economic load dispatch can only simulate the real world operation in power system. Two models, approximate and exact, have been developed. Results are compared with the available existing ones through sample systems, and the usefulness of the proposed methods is shown.
電力시스템의 短期運用을 위한 火力-揚水發電시스템의 最適運轉
李鳳容,沈建輔 弘益大學校 1985 弘大論叢 Vol.17 No.2
Large-scale electric energy storage which is economically feasible is even today possible only with pumped storage hydro plant and its merit is increasing with the increased share of base units such as nuclear power and large capacity thermal units. However, in spite of its economy only a few methods or algorithms of optimal coordination between thermal and pumped storage plants could be found in literatures. This paper proposes quite a simple concept of pumping level and peak-shaving level which minimize the total operating cost. Cost functions which contain levels explicitly can easily be obtained and it is shown that the optimization is very simple. The proposed method is demonstrated through an example system of which peak load is 2,400 [MW] and has 10 generating units. Optimal solution has resulted the saving of 22,605,000 [Won] per day.
자코비안 행렬의 반복계산을 이용한 뉴톤-랍슨 전력조류계산의 계산효율 개선
李鳳容,沈建輔 弘益大學校 1988 弘大論叢 Vol.20 No.2
A load flow method by matrix iterative solutions is presented. Instead of matrix inversion or bi-factorization required for the power mismatch solution of Jacobian matrix formula, the proposed method uses iterative technique in solving matrix linear equations. Usually this method is known to show and unreliable convergence. But when it is applied to load flow problem and some caution is made, the computation efficiency can greatly be improved. The method is simpler and easier for practical implementation than the factorization technique. 4 sample systems, 5, 14, 30 and 57-Bus IEEE Test System, are investigated to de-monstrate convergence characteristics. The proposed method has been shown the larger the system becomes, the greater the computation efficiency is.
李鳳容,金正勳,沈建輔 弘益大學校 1981 弘大論叢 Vol.13 No.-
A power flow solution program was developed based on the Newton-Raphson iterative technique. Although this technique has been widely adopted overseas, little attention has been given to it domestically. Memory requirement and matrix inversion are the main short-comings of this technique. In this paper, one dimensional non-zero element storage scheme was developed and achieved a great reduction in matrix memory. Further, matrix inversion was efficiently performed by using Choleski's decomposition technique. The results ar demonstrated with 5 and 11 Bus Systems. 제1장 서 론 제2장 본 론 1. 모선어드미턴스 구성 앨고리즘 2. 삼각함수의 근사화 계산 3. 뉴톤-랍슨 전력 조류계산의 개요 4. 자코비안 구성 앨고리즘 5. 촐스키의 분해법 6. 자코비안의 분해 및 수정 7. 선로의 유효 및 무효전력계산 8. 전력조류계산의 플로우챠트 제3장 사례연구 제4장 결 론 A power flow solution program was developed based on the Newton-Raphson iterative technique. Although this technique has been widely adopted overseas, little attention has been given to it domestically. Memory requirement and matrix inversion are the main short-comings of this technique. In this paper, one dimensional non-zero element storage scheme was developed and achieved a great reduction in matrix memory. Further, matrix inversion was efficiently performed by using Choleski's decomposition technique. The results ar demonstrated with 5 and 11 Bus Systems.
KEPCO 배전계통에서 전력유도대책을 위한 접지효과 해석
심건보(Keon-Bo Shim),김경철(Kyung-Chul Kim),이형수(Hyung-Soo Lee),최선규(Sun-Kyu Choi),최종기(Jong-Kee Choi),구성완(Sung-Wan Ku) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper presents about the grounding effect for the reduction of power induction on multiple neutral grounded distribution system in KEPCO. When 1-phase ground fault was occurred in multiple neutral grounded distribution system, most fault currents flow through the neutral conductor. And remainder fault current is flowed in earth through the neutral grounding electrode. This current - fault current is flowed in earth through the neutral grounding electrode - source of power induction. In this study, analyzed effect of source current for power induction by change of neutral grounding resistance.
배전계통에 사용되는 접지전극 재료별 초기 공사비의 경제성 비교
심건보(Keon-Bo Shim),김경철(Kyung-Chul Kim),이형수(Hyung-Soo Lee),최종기(Jong-Kee Choi),이남우(Nam-Woo Lee),나동채(Dong-Chae Na) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
To receive size of same ground resistance by form of construction work of ground electrode, there is difference of amount or price of used resources, and should construct ground electrode little more effectively because appear to differ in life period according to nature of ground electrode resources, but should consider economical efficient.
22.9㎸ 다중접지 배전계통에서 고장전류의 접지저항 영향 분석
심건보(Keon-Bo Shim),김경철(Kyung-Chul Kim),이형수(Hyung-Soo Lee),최선규(Sun-Kyu Choi),정금영(Geum-Young Jung) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.5월
During a ground fault the maximum fault current and neutral to ground voltage will appear at the pole nearest to the fault. Distribution lines are consisted of three phase conductors, an overhead ground wire and a multi-grounded neutral line. In this paper phase to neutral faults were staged at the specified concrete pole along the distribution line and measured the ground fault current distribution in the ground fault current, three poles nearest to the fault point, overhead ground wire and neutral line. A effect by grounding resistance of poles of ground fault current in te 22.9㎸ multi-ground distribution system by field tests.