• Proceedings of the KIEE Conference
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• 2008.11a
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• pp.244-246
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• 2008

EMTP-RV is the very powerful program to analyze the dynamic operation of the power system. To use this package in the large complex power system, it is very important to simplify the power system to simple equivalent network. In our study the 100 MVA STATCOM is placed at 345kV "MIGUM" which is the one of the 345kV substations of the Korean Electric Power System that is consist of more than 1000 bus. MIGUM substation is connected with 7 separated transmission lines to main Korean Electric power system. We developed a new method to simplify the network except the substation that we want to analysis. The power system outside the 345kV substation is modeled into the equivalent network. The loop network outside the substation can be modeled to simplified Thevenin equivalent network. The proposed method is applied to IEEE-14 Reliability Test System and the results shows the effectiveness of the method.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.54 no.5
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• pp.238-244
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• 2005

This paper proposes a new configuration of 36-pulse voltage source converter which consists of two 6-pulse bridges and a pulse-interleaving auxiliary circuit. The system topology of proposed converter was derived to increase the pulse number of converter output voltage without increasing the number of 6-pulse bridges. The gate pulse generation was analyzed using the theoretical approach of multi-pulse switching converter, The operational feasibility of proposed system was verified by computer simulations with PSCAD/EMTDC software and experimental works with 2kVA hardware prototype. The proposed converter can be widely used for the uninterruptible power supply, the power quality compensator, and the distributed power generation, such as solar and fuel cell power system.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2001.11a
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• pp.47-50
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• 2001

In order for effective operation of existing power systems, introduction of the so-called FACTS(Flexible AC Transmission System) such as SVC and UPFC etc, is unavoidable. The UPFC(Unified Power Flow Controller) is composed of STATCOM(Static Compensator) and SSSC(Static Synchronous Series Compensator), and is used to control the magnitude and phase angle of injected sources which are connected bothin series and in parallel with the transmission line to control the power flow and bus voltages. This paper presents a UPFC simulation on RTDS. The voltage and phase angle of a system have been analyzed by regulating the firing angle inside the UPFC.

• Journal of Power Electronics
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• v.16 no.4
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• pp.1612-1620
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• 2016

This paper presents the dynamic excitation control of a siphon-turbine coupled pico-hydro powered cage rotor induction generator and load matching for off-grid electricity generation. Through the proposed dual-role of the current-controlled voltage source converter (VSC), acting as static synchronous compensator and load controller, real and reactive power are dynamically controlled in a decoupled manner with a self supported DC-bus. The proposed scheme entails minimal computation for ensuring the rated (set) capacity of real power. The scheme also exhibits fault immunity for protection, thus enabling the effective handling of constant power electrical loads presented by base telecom station towers in remote locations. The performance of the system is evaluated under MATLAB/Simulink and is experimented through a developed hardware prototype. Simulation and experimental results show close conformity and validate the effectiveness of the proposed scheme.

• Proceedings of the KIEE Conference
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• 2007.04c
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• pp.173-176
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• 2007

본 논문에서는 풍속이 가변하는 상황에서 풍력 발전 시스템의 동작을 모의 할 수 있는 풍력 터빈 시뮬레이터를 설계 구현하였다. 실제 풍속과 회전 속도를 실시간으로 입력받으며, 토크 계산에 필요한 블레이드의 효율을 주속비에 관한 함수로 처리하여 사용함으로써 복잡한 조작 없이 가변 풍속조건에서 블레이드에 의한 토크입력을 모의할 수 있게 하였다. 또한 풍력터빈 시뮬레이터를 이용하여 농형 유도발전기식 풍력발전시스템을 구성하여 계통에 연계하였을 경우 발생되는 무효전력을 보상하기 위해 펄스 다중화 보조브리지회로를 이용한 새로운 구조의 36-펄스 전압원 컨버터방식의 실시간 무효전력보상기(STATCOM)를 적용하였다. 그리고 동작특성을 분석하고 제어시스템의 성능해석을 위하여 시뮬레이션 프로그램인 EMTDC/PSCAD를 이용한 시뮬레이션을 실시하였으며, 축소모형 하드웨어 실험을 통해 실험을 통한 분석을 실시하였다.

• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.542-545
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• 2009

고창의 전력품질 실증시험장에서 계통에 연계된 풍력발전 시뮬레이터를 이용하여 풍력발전기의 특성을 파악하기 위해, 가변 풍속에서 이중여자 풍력발전기의 회전속도와 유효전력의 변화가 계통에 미치는 영향을 분석하였다. 고창의 전력품질 실증시험장은 22.9kV 계통에 전력품질 향상기기(DVR, STATCOM, SSTS)와 전력품질 외란 발생장치 등이 구축되어 있다. 모터와 VVVF를 이용하여 풍력발전기의 블레이드를 구현하고, 유도형과 이중여자 유도형 풍력발전기를 모의할 수 있는 시뮬레이터를 개발하였다. 선로의 길이를 20 kM로 가정하고, 덕적도의 풍속데이터를 이용한 가변풍속 패턴을 설정하여 풍력발전기의 회전속도에 대한 출력특성을 확인하였다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.60 no.5
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• pp.971-976
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• 2011

This paper proposes a test system for a valve and poles building blocks used for large scale inverters such as STATCOM, SSSC, UPFC and VSC HVDC. Power semiconductors in the valve are normally connected in series to withstand switching voltage much larger than the voltage rating of a single power semiconductor. Therefore, there is a need to verify if the dynamic voltage sharing during switching in a valve is satisfactory. In this paper, we propose a test system that provides the necessary test condition: voltage and current in the valve using resonant circuits. A test scheme for a single phase inverter consisting two poles is also proposed. The performance of the inverter pole has to be verified at the factory test, before the system is installed at the site to secure the reliability of the system. The proposed scheme makes it possible to confirm if the pole can withstand voltage and current switching condition and handle loss.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.329-330
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• 2006

The purpose of this paper is to compensate the voltage drop of the power system in the AC Electric Railway Systems. Reactive power compensation is often the most effective way to improve system voltage drop. The suitable modeling of the electric railway system should be applied to the EMTP. the dynamic characteristics of 3-Phase Induction Motor in Electric Railway Systems is considered for precise modeling. it is shown through EMTP simulation using EMTP MODELS that voltage drop can be compensated effectively by STATCOM.

• Proceedings of the KIEE Conference
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• 1999.07c
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• pp.1302-1304
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• 1999

This Paper Proposes the FACTS site selection method using subtransmission system reduction. A general method which uses the sensitivity of the variation in voltage and reactive Power has been used to determine the location of shunt type FACTS device, but there is a difficulty to find a proper location due to the overestimation of the effect of sub-transmission systems. Therefore, there is a need to reduce sub-transmission system for finding an effective location of shunt type FACTS devices such as SVC(Static Var Compensator), STATCOM(Static Synchronous Compesator), and so on.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.201-202
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• 2015

전력계통이 대형화, 복잡화됨에 따라 현재의 전력전송은 한계 전송량에 가깝게 운영되고 있다. 또한 정치적, 경제적, 사회적 수용성 등의 이유로 전력을 융통하기 위한 신규 초고압 송전선로의 건설도 어려운 실정이다. 이 때 루트 송전선로의 탈락은 계통의 과도안정도에 큰 영향을 끼칠 수 있으며, 발전기 탈락을 통하여 계통을 안정화 시킬 수 있다. 하지만 과도한 발전기 탈락은 계통의 신뢰성 있는 운영에 방해물이 될 수 있다. 유연송전기기(FACTS, Flexible AC Transmission Systems)는 이러한 루트 선로 탈락에 따른 발전기 탈락을 최소화 할 수 있다. 본 논문에서는 FACTS의 한 종류인 STATCOM(Static Synchronous Compensator)을 이용하여 사고 시, FACTS 기기 설치 유무에 따른 과도안정도 분석을 진행한다.