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정형환,안병철,허동렬 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.2
This report has been suggested a calculation method include the DC-Link equations into process of power flow repetition of AC system, on to use the fast decoupled method. The DC link model which consisted of thirteen non-linear equations could be expressed using nine non-linear equations in accordance with the consideration of system configuration and functional characteristic. In recognition of the advantage for DC transmission on a side of elevation upon an economical transmission through a lower loss and a stability enhancement, the estabishment of real system and this study are doing to activate in the world. Also in our land, the DC transmission between the shore and Jae-Ju Province is going to expedite in actual fact. Such as fact in today, it has been done to think that is meaningful to exhibit the effective power flow for advactage fo a memory capacity, a calculatot's speed, and can be known the electric power distributions of integrated AC-DC system.
퍼지 전 보상 PID 제어기를 이용한 전력계통의 부하주파수 제어에 관한 연구
정형환,정문규,유재엽 동아대학교 생산기술연구소 1999 生産技術硏究所硏究論文集 Vol.4 No.1
In this paper, we propose the FP PID controller for the load frequency control of 2-area power system. While a PID controller is used in power system, they have many problems as the nonlinearities of power system. So, we are tried to compensate a conventional PID controller by a fuzzy logic-based precompensation approach to robust nonlinearities. Our results show that the proposed control technique is superior to a conventional PID controller in dynamic responses about load disturbances arising in power system. Our design is easily implemented by adding a fuzzy precompenastor to an existing PID controller.
誘起電壓 檢出에 의한 無整流子電動機의 始動에 관한 硏究
정형환,주수원,이권순 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.2
Today, the commutatorless motor is widely sued and studided. And, the driving methed is presented. The natural commutation using the thyristor invertor is not needed the supplementary circuits and simplified the control circuits Therefore, it is expected that the reliability is increasing But, the main defects of the motor is needed the position detecting devices attached to the motor outside And, certain mechanical attachment errors affect the output and efficiency of the motor Therefore, this paper proposes the motor driving techniques without the using of the supplementary devices. With the detection of inducing voltage, control of thyristor and zero-crossing signals, it is achieved Also, it is stable and practicable in a whole ranges.
정형환,주수원,이광우 동아대학교 공과대학 부설 한국자원개발연구소 1987 硏究報告 Vol.11 No.2
This model is built up according to the ecologic relationships between different epidemiological types of individuals. A Markovian process is associated to the epidemic control process with a finite number of states and a discrete time. {Y_(t), t≥0} The quantitative aspect of the model was characterized by digital computer simulation.
交流一直流 電力系統의 효과적인 潮流計算을 위한 새로운 方法
정동일,이광우,정형환 東亞大學校 海洋資源硏究所 1993 硏究論文集 Vol.6 No.1
The new method results from a further simplipication of the unified methods. The a. c. systme equations are solved with the d. c. system modelled simple as a real and reactive power injection at the appropriate ferm busbar. For d. c. solution the a. c. system is modelled simply as a constant voltage at the Converter a. c. terminal busbar.
오차역전파 학습 알고리즘을 이용한 전력계통의 부하주파수제어
정형환,김상효,주석민,김경훈 동아대학교 건설기술연구소 1996 硏究報告 Vol.20 No.1
This paper presents Error Back-Propagation Learning Algorithm techniques for load frequency control on two area power system. Using learning algorithm of error back-propagation after learning accept input on the optimal control e_(i), e_(i) and u_(i) frequency characteristic and tie-line load flow characteristic investigated dynamic.
鄭亨煥,周秀元,禹靖仁 동아대학교 공과대학 부설 한국자원개발연구소 1979 硏究報告 Vol.4 No.1
The Newton-Raphson Method has now gained widespread popularity in Load-Flow calculation. In this paper programming is developed with aims to improve the covergence characteristic, speed and memory requirements in the above method.
신경회로망 자기동조 PID 제어기를 이용한 전력계통 안정화에 관한 연구
정형환,김상효,이정필,정문규 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.2
This paper applied the neural network self-tuning PID controller to its linearized one-machine infinite bus for improvement in the power system stabilization. It ia tried to regulate the optimum parameters of the PID Controller using the learning algorithm of error back propagation. The simulation results show that the proposed control technique is decidedly superior to the conventional ones in dynamic responses about various disturbances arising in the power system.
IA-PID 제어기를 이용한 교류-직류시스템의 동태안정도에 관한 연구
정형환,정현화,왕용필,박희철 동아대학교 생산기술연구소 2001 生産技術硏究所硏究論文集 Vol.6 No.2
In this paper, a method for optimal design of PID controller using the immune algorithm(IA) has been proposed to improve the stability of A.C.-D.C. power system. To design optimal PID controller, formulation of A.C.-D.C. system equation, selection of stability analysis model, formulation immune algorithm and application model of optimal PID controller are proposed in order of the paper. In case of various disturbance, computer simulations have been performed and the proposed IA-PID controller has been compared with base controller which is conventional control technique for dynamics. From simulation results, it is demonstrated that proposed IA-PID controller has good dynamic responses about the disturbance of power system and reliability as compared with the base control.