A Study on the Design of Power System Stabilizer Using DeadBeat Control

Lim, Chan-Ho 慶州大學校 2005 論文集 Vol.18 No.2

데드비트제어는 리플이 없는 출려응답을 얻을 수 있고, 정해진 샘플링 주기 후에 오차 없는 정상상태에 도달하는 특성을 가지고 있다. 본 논문에서는 이러한 특성을 가진 데드비트 제어기를 전력계통 안정화 제어기에 적용하여, 전력시스템의 저주파 진동현상을 제어하기 위한 방안을 제안하였다 제안된 데드비트제어기는 적분제어기와 상태관측기 및 영차홀드로 구성하여 설계하였으며, 성능 검증을 위하여 최적 제어기와 비교 시뮬레이션을 수행하였다. 시뮬레이션 결과 초기상태에 의한 출력응답의 경우에 있어서 최적제어기 보다 1.5배 빠르게 정상상태에 도달하였고, 리플이 없는 응답을 보였다.

배전 네트워크의 정전복구를 위한 휴리스틱 분할기법에 관한 연구

임찬호 경주대학교 정보전자기술연구소 2003 情報電子技術論叢 Vol.2 No.-

Comparing with transmission networks, the faults in distribution networks more often occurs because of the complicated structure and the adjacency to customers. Moreover the faults give direct damage to customers. So fault diagnosis and blackout restoration in distribution networks are very important elements to reduce the damage of customers and to maintain the stability. The restoration problem of distribution networks is subject to time. The restoration process has to be accomplished through several switching. This paper proposes the efficient heuristic division method in distribution networks. The proposed method minimized the time to divide the blackout regions. The proposed system is applied to the sample networks, and the results showed a promising possibility.

변전소 상태추정을 위한 실시간 위상구조 처리기에 관한 연구

임찬호 경주대학교 정보전자기술연구소 2007 情報電子技術論叢 Vol.6 No.-

State estimation is the function for an error correction of an analog data measured in EMS (Energy Management System) or SCADA system. Topology processing is indispensable basic function in order to generate a system matrix for state estimation of substation. This paper propose an expert system to generate system matrix automatically using artificial intelligence technology and it is applied to 154kV distribution substations. This expert system will be applied to state estimation systems and contribute to improving reliability of a substation automation system.

전자 렌즈에서 초점 거리와 프르브 전류의 관계

임선종,이찬홍 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

The focal length decreases as the current increase. The focal length increases at higher accelerating voltages for the same lens excitation since the velocity of the electrons increases with increasing beam voltage. If the focal length is short, probe current is small because the most part of electrons connect on aperture. In this paper, we analysis the relation between focal length and probe current. In the measurement of probe current, faraday cup is used for it and it does not allow the backscattered and secondary electrons generated by the incident beam to escape.

지역급전 분소에서의 통합 고장진단을 위한 퍼지 전문가 시스템에 관한 연구

임찬호 경주대학교 정보전자기술연구소 2005 情報電子技術論叢 Vol.4 No.-

During the last decade, a lot of expert systems have been proposed to cope with various problems in power system to make toward the eventual dream of fully automated reliable power system, This paper presents a practical fuzzy expert system to diagnose various faults occurred in local power systems. This integrated system can diagnose all faults occurred in a transmission network and substations. In this paper, the fuzzy reasoning of the diagnostic process is discussed in detail. The discrimination of false operations and non-operations of protective devices as well as the fault identification scheme are also analyzed together with the fuzzy inference process. The efficiency of the proposed fuzzy expert system is verified through the several case studies.

퍼지 제어기의 비선형 특성 향상을 위한 계수동조 기법에 관한 연구

임찬호 경주대학교 2001 論文集 Vol.14 No.-

The fuzzy theory has been applied to the control systems due to its excellent properties on the nonlinear systems. But the design process of fuzzy controller requires empirical and heuristic knowledge of human experts as well as many trial-and-errors in general. This process is time consuming task. The simulated annealing is the optimization algorithm which guarantee the global optimum. This paper presents an parameters tuning method of the fuzzy controller using the simulated annealing. The proposed tuning method is applied to the fuzzy controller for the low frequency oscillation of a synchronous generator. Through the comparative simulation with linear controller under various operating conditions, the robustness of fuzzy controller is verified. And the efficiency of the proposed tuning method is verified.

중앙심벽형댐의 응력전이에 관한 연구

임희대,임찬수,이성용 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2

Various modes of load transfer may exist in rockfill dams. If the core is softer than the shells, load is transferred from the core onto the shells as a result of greater downward displacement of the core with respect to the shells. But if the core is stiffer than the shells, load transfer occurs from the shells onto the core. In this study, the mechanisms of load transfer in rockfill dams have been outlined and load transfer of Juam main and regulation dam with central core are evaluated by load transfer ratio. The load transfer ratio is defined as the ratio of computed values of major principal stresses in the core to the core overburden stresses. The vertical stresses are determined by the FEM, which use hyperbolic model and incremental method to simulate placement of successive layers of fill. The hyperbolic paramaters for the core was estimated from a series of conventional triaxial tests carried out during construction. From the results of this analyses and its comparison with the values measured by soil pressure meters, it has been shown that significant load transfer from the core to the shells was observed in two dams and that the load transfer ratios predicted are higher than the values measured.

주방환기 시스템의 공기 급기구의 위치에 따른 성능평가

임경빈,송시영,이찬호 한밭대학교 생산기반기술연구소 2003 생산기반기술연구소 논문집 Vol.3 No.1

The purpose of this study is to investigate the performance evaluation of indoor diffusion rate of surplus heat generated from gas range and concentration distribution of combustion gas by position change of air- diffuser and range-hood with separating plate. A numerical analysis is performed with four cases of this ventilation system for kitchen. The results showed that thermal and flow distribution can be more effective, when air supply diffuser is located at middle position. Also, Comparisons of Indoor Air Quality(IAQ) are made between using separating plate and not using, IAQ was improved in case of using separating plate and also, kitchen exhaust hood concentration distribution was improved about 30%

지역급전 분소에서의 계층 협조 전문가 시스템의 연구

임찬호 경주대학교 2000 論文集 Vol.13 No.-

This paper presents a hierarchical coordination expert system of the local control center(LCC) to secure reliability of power system operation and to provide form power system automation. The proposed system divides the support system of existing local control center into two operating system - LCC and substation operating system. In the substations system, diagnosis off substation faults and restoration of blackout regions are performed. When a substation fault spreads transmission lines, the fault diagnosis and restoration is performed in each operating support system with reciprocal coordination structure. The efficiency of the proposed expert system is proved through the test system.

쌍대단체법의 효율적인 구현을 위한 기법

임성묵,박찬규,김우제,박순달 한국경영과학회 1999 經營 科學 Vol.16 No.1

The purpose of this paper is to develope efficient techniques for implementing the dual simplex method in this paper we proposed one artificial row technique to get an initial dual feasible basic solution, a dual steepest-edge method coupled with a dropping row selection rule, and an anti-degeneracy technique which resembles the EXPAND procedure for the primal simplex method the efficiency of the above techniques is shown by experiments Finally, the dual simplex method is shown to be superior to the primal simplex method when it is used in the integer programming