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PV 어레이의 계통연계 모의를 위한 PSCAD 사용자 정의 모델 개발
안선주(Ahn Seon-Ju),최준호(Choi Joon-Ho) 한국태양에너지학회 2011 한국태양에너지학회 논문집 Vol.31 No.5
Since large and smalls cale photovoltaic(PV) systems have been commercialized in many countries it is necessary to assess the effects of PV systems on the electric power system. For this the development of accurate simulation model of PV arrays is very important. PSCAD/EMTDC a widely used simulation tool for analyzing the transient behavior of electrical apparatus and networks does not have a standard model of a PV array. Therefore in order to simulate the PV array users have to develop their own simulation model. However the block-diagram-based model is very complicated and it is hard to modify the model parameters. In this study we develop the user-defined model of a PV array by using the Design Editor which is provided by PSCAD program. The mathematical model of a PV array and the method to determine the parameters of nonlinear I-V equation are implemented in a Fortran code. The graphical user interface provides the users with easy and simple way to modify the PV array parameters and simulation conditions. In order to help the users this model also provides the parameters of 10 commercial PV arrays.
준정상상태 해석을 통한 고정속 풍력 발전기의 FRT에 대한 STATCOM의 효과 분석
안선주(Seon-Ju Ahn),황평익(Pyeong-Ik Hwang),남순열(Soon-Ryul Nam),강상희(Sang-Hee Kang),문승일(Seung-Il Moon) 대한전기학회 2010 전기학회논문지 Vol.59 No.4
This paper analyzes the effect of the STATCOM on the improvement of the Fault Ride Through (FRT) capability of the fixed speed wind turbines(FSWTs). The steady-state models of the wind farm components, such as induction generator, capacitor bank, and the STATCOM, are developed based on the simplified equivalent circuit. Especially, the STATCOM is modeled as a controllable current source and a method that analytically determines the magnitude of the injection current is developed. For the quasi-steady-state(QSS) analysis, the steady-state model of the generator and STATCOM are merged with the dynamic model of drive train. The QSS simulation with the STATCOM shows that the STATCOM can enhance the FRT performance by improving the wr - Te characteristics of the FSWTs.
분산전원의 구성 및 출력 제어 방법에 따른 Droop 계수 설정 방법
安善柱(Seon-Ju Ahn),朴辰祐(Jin-Woo Park),丁一燁(Il-Yop Chung),文承逸(Seung-Il Moon) 대한전기학회 2008 전기학회논문지 Vol.57 No.11
Microgrid usually consists of a cluster of distributed generators(DGs), energy storage systems and loads, and can operate in the grid-connected mode and the islanded mode. This paper presents detailed descriptions of two different options for controlling the active power of DGs in the microgrid. One is regulating the power injected by the unit to a desired amount(Unit output power con troll and the other is to regulate the flow of active power in the feeder where the unit is installed to a constant(Feeder flow control). Frequency-droop characteristics are used to achieve good active power sharing when the microgrid operates in the islanded mode. The change in the frequency and the active power output of DGs are investigated according to the control mode and the configuration of DGs when the microgrid is disconnected from the main grid. From the analysis, this paper proposes a method to determine the droop constant of DGs operating in the feeder flow control mode. Simulation results using the PSCAD/EMTDC are presented to validate the approach, which shows good performance as opposed to the conventional one.
전압계측기반 CVR제어 알고리즘 개발 및 검증을 위한 RTDS-MATLAB 연동 시뮬레이션 환경 개발
고석일,안선주,최준호,남궁원,신창훈,Go, Seok-Il,Ahn, Seon-Ju,Choi, Joon-Ho,Nam-Koong, Won,Shin, Chang-Hoon 한국전력공사 2016 KEPCO Journal on electric power and energy Vol.2 No.4
CVR is a technique for reducing power consumption by reducing the voltage of the system and many demonstrations and studies have been conducted in the past. Recently, SCADA-based or AMI-based VVC have been developed and the CVR is used as an important operation mode. Using a variety of instruments, CVR determines the optimal VVC control references by closed loop control. In this paper, we implemented RTDS-MATLAB integrated simulation environment for development and verification of CVR control algorithm based on voltage measurement. The voltage control device of distribution system was modeled using RTDS and MATLAB has constructed a controller that can measure and control the voltage of the simulation system of RTDS. After the capacitor, which is a reactive power control device, flattens the voltage of the system, the control algorithm reduces the voltage of the system by tap control of the OLTC based on the flatten voltage. The proposed system was verified by simulations. CVR은 계통의 전압을 감소시켜 소비 전력을 줄이는 기술로, 과거 많은 실증과 연구가 진행되어 왔다. 최근, SCADA 기반 또는 AMI 기반의 VVC가 개발되면서 CVR이 중요한 운영 방식이 되었다. CVR은 다양한 계측기를 사용하여 폐루프 제어(closed loop control)방식으로 최적 VVC제어 지령치를 결정한다. 본 논문에서는 전압 계측기반 CVR제어 알고리즘 개발 및 검증을 위한 RTDS-MATLAB 연동 환경을 구현하였다. RTDS를 이용하여 배전 계통의 전압제어기기들을 모델링하고 MATLAB으로 RTDS의 모의 계통의 전압을 계측하고 제어할 수 있는 제어기를 구성하였다. 무효전력 제어기기인 캐패시터는 계통의 전압을 평탄화하고 계통의 전압 기반으로 OLTC의 탭 제어를 하여 계통의 전압을 낮추는 제어 알고리즘을 MATLAB을 통해 구현하였다. 시뮬레이션을 통해 제안한 시스템을 검증하였다.
국내 배전계통에서의 CVR 계수 추정 및 경제적 효과 분석 적용 방안
안규선(Gyu-Seon An),안선주(Seon-Ju Ahn),윤상윤(Sang-Yun Yun),최준호(Joon-Ho Choi),고석일(Seok-Il Go) 대한전기학회 2020 전기학회논문지 Vol.69 No.6
In this paper, the CVR estimation method is proposed using the direct method. This method calculates the voltage change and the load change for the same time period when the tap of a main transformer in a substation changes. Through these CVR estimation results, economic analysis is conducted by analying the CVR effect of the domestic distribution systems. Based on the estimated CVR factor, a representative model of the domestic distribution system is assumed, and economic analysis is evaluated through CVR effect analysis when CVR control is operated. Demand reduction of a substation and line loss reduction costs are calculated using the CVR factor and voltage reduction. Through this analysis, CVR in distribution systems can be expected to reduce the power loss cost and power plant construction cost.