• 한국패류학회지
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• 제28권4호
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• pp.349-359
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• 2012

The purpose of this study is to compare the clearance rate (CR) and intake rate (IR) of juvenile purple clam, Saxidomus purpuratus when feeding on different unialgal diet of red tide dinoflagellates (RTDs), and to know what is the most important cell characteristic of RTDs to cause the differences in feeding parameters. Experiments were performed to measure the CR and IR of juvenile S. purpuratus as a function of algal concentration when food was either the standard food, Isochrysis galbana or one of 9 RTDs. Patterns of CR with increasing algal concentration were similar among different RTDs. The highest $C_{max}$ was observed when S. purpuratus was feeding on A. affine, while the lowest on C. polykrikoides. The patterns of IR with increasing algal concentration were also similar among different RTDs. However, there were great differences in the maximum value of IR ($I_{max}$) among different RTDs. The highest $I_{max}$ was observed when S. purpuratus was feeding on A. carterae, while the lowest on G. catenatum. Some RTDs similar in size showed different $C_{max}$. Other RTDs different in size showed similar $I_{max}$. Life form of each RTD affected significantly the $I_{max}$, which was higher for single-celled RTDs than chain-forming RTDs. There were no significant differences in feeding parameters between toxic and nontoxic RTDs. Moreover, a toxic dinoflagellate, A. carterae recorded the highest $I_{max}$ among RTDs. The most important characteristic of RTD as a factor affecting the feeding rate of S. purpuratus was life form, not size or toxicity of RTD species.

• 전기학회논문지
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• 제56권2호
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• pp.325-333
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• 2007

A PV system inverter test module using RTDS was developed and performance test of a commercial PV inverter was carried out. The developed module consists of one RTDS hardware rack, RTDS software models representing PV array and simple distribution system, and two power amplifiers that was specifically designed for generating power corresponding to signals from RTDS. Performance test results verified effectiveness and reliability of the test module. It is expected that the developed test module may help PV inverter manufacturers improve ana test their systems in the developing stage.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전력기술부문
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• pp.240-242
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• 2006

In this paper, Infra system that can monitor and analyze the wide area power system phenomena based on RTDS is established. This system provide users with understandable viewer for monitoring power system as well as management system for RTDS simulation model cases. The tests are studied based on 345kV, 115 buses korean system using RTDS.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전력기술부문
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• pp.102-104
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• 2006

본 논문에서는 RTDS 시뮬레이터를 이용하여 현재 개발중인 STATCOM 시스템의 제어기의 성능을 검증하였다. STATCOM 제어기와 연계하기위한 RTDS 시뮬레이터의 구성방안과 RTDS 내부에 GPC 카드를 이용한 STATCOM 인버터 모델을 개발하였으며, 간단한 계통을 구성하여 제어기-시뮬레이터 연동시험을 실시하여 제어기의 성능을 검증하였다.

• 전력전자학회지
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• 제16권6호
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• pp.45-50
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• 2011

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.304-306
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• 2005

This paper presents the RTDS training course on using passive filters for control of harmonic currents. The course can show harmonic currents in porer system, which is occurred by function generators, with Fourier analysis function of RTDS and the effect of passive filters implemented in RTDS to eliminate harmonics. In addition to, With Jeju-Haenam HVDC system, we have simulated the effect of passive filters on harmonic currents occurred by massive power conversion system of HVDC.

• 한국초전도ㆍ저온공학회논문지
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• 제10권3호
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• pp.9-13
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• 2008

It is very important to study the protective relaying system from the viewpoint of technical analysis to apply superconducting power devices to real power systems. In this paper, we developed Superconducting Fault Current Limiter (SFCL) analysis model using Real Time Digital Simulator(RTDS) for protective relay tests in power system with SFCLs. The RTDS model has the operation mechanism of a real SFCL system.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제4B권3호
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• pp.146-152
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• 2004

Cost effective simulation schemes for Wind Power Generation Systems (WPGS) considering wind turbine types, generators and load capacities have been strongly investigated by researchers. As an alternative, a true weather condition based simulation method using a real-time digital simulator (RTDS) is experimented in this paper for the online real-time simulation of the WPGS. A stand-alone WPGS is, especially, simulated using the Simulation method for WPGS using Real Weather conditions (SWRW) in this work. The characteristic equation of a wind turbine is implemented in the RTDS and a RTDS model component that can be used to represent any type of wind turbine in the simulations is also established. The actual data related to weather conditions are interfaced directly to the RTDS for the purpose of online real-time simulation of the stand-alone WPGS. The outcomes of the simulation demonstrate the effectiveness of the proposed simulation scheme. The results also signify that the cost effective verification of efficiency and stability for the WPGS is possible by the proposed real-time simulation method.

• 한국초전도ㆍ저온공학회논문지
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• 제11권3호
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• pp.35-39
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• 2009

The study for a protective relay system is one of the important technical issues on the power system application of Superconducting Fault Current Limiter (SFCL). We used Real Time Digital Simulator(RTDS) to study the true interaction of the protection system with the power system. RTDS modeling of SFCL is necessary to the detailed protective relay tests. In this paper, we developed an analysis model using RTDS for studying the transient behavior of 22.9kV SFCL and carried out closed-loop testing of protective relays in distribution power system with the developed SFCL model. The SFCL model has the operation mechanism of 22.9kV hybrid SFCL being developed by LSIS and KEPRI in Korea. The parameters of the model are based on the test data of the real SFCL. Power system planners and operators can solve the expected problems in power system application of SFCL using protective relay testing results.

• KEPCO Journal on Electric Power and Energy
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• 제2권4호
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• pp.549-556
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• 2016

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.