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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.
電源開發計劃에 있어서 解析的 評價函數를 利用한 補修率 最適化 앨고리즘
金正勳,李鳳容 弘益大學校 1982 弘大論叢 Vol.14 No.2
A NEW ALGORITHM is presented for optimum maintenance scheduling using marginal maintenance cost in long-term power system planning. Marginal maintenance cost equation is derived from analytic operation cost equation. From the results of case studies which were carried out for two sample systems, it is not an optimum solution to solve power system planning problem without optimum maintenance scheduling and speed of the new algorithm is faster than that of conventional algorithm, which has the ANALYTIC operating cost and marginal maintenance cost, equation.
李鳳容 弘益大學校 1980 弘大論叢 Vol.12 No.-
The convergence characteristics is a prime importance in decoupled Newton-Raphson load flow calculation, since it exhibits often convergence instability, particularly in heavy load levels. It is known that any meaningful improvement is of no use. However, it is found that some slight modifications using quadratic performance function show better stability and remarkable reduction of iteration steps. In a real-scale power-system, improved convergence is demonstrated.
李鳳容 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.4 No.-
The economic operation in power systems has long been in keen interests for power system engineers. The classical equal incremental fuel cost rule is still the basis for it, even though more elaborate tools such as optimal power flow have been developed already. The classical method requires usually many iterations, while the optimal power flow shows often some difficulties. This paper suggests a single step solution based on the classical method revisited. The concept is shown graphically. Three sample systems are compared. The proposed approach has shown a single step solution regardless system sizes, while the conventional methods require many iterations.