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전자기 과도현상 해석과 고조파 평가를 위한 S영역 주파수 의존 등가시스템 개발
왕용필(Y. P. Wang),정형환(H. H. Chong),이준탁(J. T. Lee),한형주(H. H. Han),김해재(H. J. Kim),정동일(D. I. Chong),곽노홍(N. H. Kwak) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
The recent power systems are very complex and to model them completely is impractical for analysis of electromagnetic transient. Therefore areas outside the immediate area of interest must be represented by some form of Frequency Dependent Network Equivalent (FDNE). In this paper a method for developing Frequency Dependent Network Equivalent (FDNE) using S-domain rational Function Fitting is presented and demonstrated. The FDNE is generated by Linearized Least Squares Fitting(LSF) of the frequency response of a S-domain formulation. This Three-port FDNE have been applied to the test AC power system. The electromagnetic transient package PSCAD/EMTDC is used to assess the transient response of the Three-port FDNE developed under different condition. The study results have indicated the robustness and accuracy of Three-port FDNE for analisys of electromagnetic transient and harmonic assessment.
고속 분할법에 의한 교류-직류 전력계통의 조류계산에 관한연구
안병철,정형환,이권순,이준탁,정동일,왕용필 東亞大學校 海洋資源硏究所 1992 硏究論文集 Vol.5 No.1
The active and reactive power transfers to and from nodes connected to h.v.d.c. links do not obey the general rules of a.c. power transmission, the active power is independent of phase angle relationships and the reactive power is not directly related to voltage variation. Under such circumstances it is difficult to visualize h.v.d.c. model compatible with the behaviour of the fast decoupled algorithm. However, acknowledging the general acceptance of fast decoupled programes and the existence of some h.v.d.c. links(particularly considering their large power-carrying capacitors) a model of the h.v.d.c. transmission link suitable for incorporation with fast decoupled loadflow programes is described in the following sections.
정형환,이준탁,김해재,정동일 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.1
This paper presents a Fuzzy Control Technique to improve the load frequency control dynamics of a power system for a given stepwise load perturbation. A related simulation results follow and show that the optimized rules by the proposed technique are very effective for reduction of overshoot and deviation of load frequency in steady-state, and for minimization of settling time.
정형환,정동일,안병철 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.1
This paper presents design technique of power demand estimator and fuzzy inference for load frequency control of two areas power systems. The estimator is constructed by using the method of differential approximation on power equilibrium equation. And also it is showed to have the excellent adaptive performance against change in various disturbances and the usefullness of this controller from the simulation results.