http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
왕용필,정종원,정동일,Wang, Yong-Peel,Jeong, Jong-Won,Jeong, Dong-Il 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.3
최근 전력 전자 응용 기기의 사용증가로 비선형 특성 부하에 의한 고조파가 상당히 발생하고 있으며, 이에 의한 영향으로 배전시스템의 변압기 열화, 소자의 고장, 통신 간섭 등의 여러 가지 문제를 발생시키고 있다. 따라서 배전 시스템에서의 고조파 수준과 전달특성을 정확하게 분석하기 위하여 배전시스템의 효과적인 실측정과 모델링에 관한 연구가 필요한 실정이다. 본 논문에서는 고조파 관리기준 IEC61000-3-6 토대로 배전 시스템의 고조파 특성을 해석하기 위하여 공통 결합점(Point of Common Coupling : PCC)을 선택하였다. 실 배전 시스템의 PCC 지점에서 고조파 전압, 전류를 측정하여, 고조파 분포, 비선형 부하 성분 및 고조파 전압, 전류 왜형률 (Voltage/Current Total Harmonic Distortion: VTHD/ITHD)을 분석하였다. 또한 정상상태에서 고조파 임피던스, 전압, 전류을 해석을 통하여 실 배전시스템을 효과적이고 정확하게 모델링 되었을 확인하였다. 또한 고조파 전류원 발생시에 고조파 전압, 전류를 비교 분석하여 고조파 전달특성을 조사하였다. The increasing use of power electronic equipment in distribution system has been the reason for the greater concern about a harmonic in recent time. Therefore, it is necessary for measurement and modelling to analyze a harmonic level and a transfer characteristic in distribution system. In this paper, the Point of Common Coupling (PCC) is selected to analyze harmonic characteristic of distribution system by IEC 61000-3-6. Harmonic voltage and orient were measured at the PCC of real distribution system Harmonic distribution, nonlinear load component and Total Harmonic Distortion(THD) were verified. The effective and accurate modelling of real distribution system were proved through a analysis of harmonic impedance, voltage and current under steady-state. Harmonic transfer characteristic were investigated through a analysis of harmonic voltage and current under harmonic current source.
전자기 과도현상 해석을 위한 S 영역 등가시스템 PART Ⅱ: 주파수 의존 교류 시스템 등가
왕용필,정형환 대한전기학회 2005 전기학회논문지A Vol.54 No.4
- Electromagnetic transient simulation can be used to model complex non-linearities that very difficult to represent adequately in the frequency domain. This problem is greatly reduced with the use of frequency dependent network equivalents for the linear part of the system. S-domain rational function fitting techniques for representing frequency dependent equivalents have been developed using Least Squares Fitting(LSF). However it does not suffer the implementation error that exited in this work as it ignored the instantaneous term. This paper presents the formulation for developing 2 port Frequency Dependent AC System Equivalent(FDACSE) with the instantaneous term in S-domain and illustrates its use. This 2 port FDNE have been applied to the New Zealand AC system. The electromagnetic transient package PSCAD/EMTDC is used to assess the transient response of the 2 port (FDACSE) developed with Norton Equivalent network. The study results have indicated the robustness and accuracy of 2 port FDACSE for electromagnetic transient studies.
H∞최적 제어기법을 이용한 전력계통의 안정화에 관한 연구
정형환,이정필,허동렬,왕용필 東亞大學校 海洋資源硏究所 1998 硏究論文集 Vol.11 No.1
In this paper, we are considered various possible disturbance conditions in order to design controller, H ∞ optimal controller is successfully designed to control in such as situations. To do this, we are determined weighting function and design parameter γ to method of trial and error by Glover-Doyle algorithm. To compare with H∞-PSS and conventional-PSS which is applied in nominal system and load variations, the dynamic characteristics of H∞-PSS controller was verified which has a good response.
상태 가중치 개선에 의한 교류-직류 연계계통의 동태안정도에 관한 연구
정형환,안병철,왕용필 東亞大學校 1995 東亞論叢 Vol.32 No.-
In this paper, a dynamic state equation is constructed in order to get an optimal control signal for stabilization of a power system. Co-state matries to each of its coefficient matrices are also found. According to these matrices, eigenvalue, eigenvalue sensitivity and state weighting are calculated and the riccati equation is constructed. The control signal is determined by the roots of the equation and during this process, state weighting are adjusted to the shift of dominant eigenvalue until optimal one can be found. The resultant optimal controller, which is obtained by the process mentioned above, is applied to A.C. only and A.C - D.C. power systems. The dynamic stability of voltage and frequency of the power system with disturbances is considered.
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.
왕용필(Y. P. Wang),정형환(H. H. Chong),한형주(H. H. Han),곽노홍(N. H. Kwak),전영수(Y. S. Jeon),박상호(S. H. Park),김경철(K. C. Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Recently, due to increasing the application of power electronic equipment, harmonics generated from the non-liner load are fairly produced. Harmonics can cause a variety of problems such as the overheating of distribution transformer, the breakdown of device and communication interference. Interest about power quality decline of power system is very increased. In this paper, we are measured the harmonic voltage and current of power system to analyze harmonic characteristics, and it is analyzed Total Harmonic Distortion(THD). Also, we are modeled power system using PSCAD/EMTDC. And it is analyzed harmonic voltage and current in steady-state. The study results have been indicated the utility about harmonics analysis and modelling for power system.
전기설비 시공품질 개선을 위한 시공표준화(KEIS) 도입방안
왕용필(Yong-Peel Wang),한형주(Hyeong-Ju Han),김우호(Woo-Ho Kim),현소영(So-Young Hyun),김효진(Hyo-Jin Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
전기설비의 이용은 시공을 통해 가능하게 되는 만큼 산업에 있어 매우 중요한 기술분야이다. 전기설비 시공불량이 발생할 경우 적지않은 산업적 · 경제적 손실이 발생하게 된다. 특히 신기술이 적용된 전기설비에 있어서는 그 영향력이 커질 수 밖에 없다. 따라서 전기설비 시공불량과 유지보수의 최소화는 전기공사업에 미치는 영향과 더불어 경제적 이익과도 관련이 있다. 따라서 시공품질을 개선하기 위해 시공표준화를 도입함으로써 완벽한 전기설비를 갖추도록 하는 것이 필요하다.