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Transient Stability Analysis using Large-Scale Real Time Digital Simulator
Yoon, Yong-Beum,Kim, Tae-Kyun,Won, Jong-Ryul,Shin, Jeong-Hoon,Kim, Yong-Hak,Cha, Seung-Tae,Choo, Jin-Boo The Korean Institute of Electrical Engineers 2001 KIEE International Transactions on Power Engineeri Vol.a11 No.4
The KEPS(KEPCO's Enhanced Power system Simulator) Real Time Digital Simulator(RTDS) is the largest real time power system simulator ever built. A power system which includes 320 (3-phase) buses and 90 generators has been modeled and run in real time. Since such large-scale systems were involved, it was not practical to validate them using non-real time electro-magnetic transient programs such as EMTDC™ or EMTP. Instead, the results of the real time electromagnetic transient simulation were validated by comparing to transient stability simulations run using PTI's PSS/E™ program. The comparison of results from the two programs is very good in almost all cases. However, as expected, some differences did exist and were investigated. The differences in the results were primarily traced to the fact that the electromagnetic transient solution algorithm provides more detail solutions and therefore greater accuracy than the transient stability algorithm. After finding very good comparison of results between RTDS Simulator and PSS/E, and after investigating the discrepancies found, KEPCO gained the necessary confidence to use the large-scale real time simulator to analyze and develop their power system.
Hae-Gweon Kang,Un-Sig Song,Jin-Ho Kim,Se-Chang Kim,Jong-Soo Park,Jong-Eun Park 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.3
The digital substations are being built based on the IEC 61850 network. The cooperation and protection of power system are becoming more intelligent and reliable in the environment of digital substation. This paper proposes a novel method to prevent the malfunction caused by the Transformer Magnetizing Inrush Current(TMIC) using the IEC 61850 based data sharing between the IEDs. To protect a main transformer, the current differential protection(87T) and over-current protection(50/51) are used generally. The 87T IED applies to the second harmonic blocking method to prevent the malfunction caused by the TMIC. However, the 50/51 IED may malfunction caused by the TMIC. To solve that problem, the proposed method uses a GOOSE inter-lock signal between two IEDs. The 87T IED transmits a blocking GOOSE signal to the 50/51 IED, when the TMIC is detected. The proposed method can make a cooperation of digital substation protection system more intelligent. To verify the performance of proposed method, this paper performs the real time test using the RTDS (Real Time Digital Simulator) test-bed. Using the RTDS, the power system transients are simulated, and the TMIC is generated. The performance of proposed method is verified in real-time using that actual current signals. The reaction of simulated power system responding to the operation of IEDs can be also confirmed.
Kang, Hae-Gweon,Song, Un-Sig,Kim, Jin-Ho,Kim, Se-Chang,Park, Jong-Soo,Park, Jong-Eun The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.3
The digital substations are being built based on the IEC 61850 network. The cooperation and protection of power system are becoming more intelligent and reliable in the environment of digital substation. This paper proposes a novel method to prevent the malfunction caused by the Transformer Magnetizing Inrush Current(TMIC) using the IEC 61850 based data sharing between the IEDs. To protect a main transformer, the current differential protection(87T) and over-current protection(50/51) are used generally. The 87T IED applies to the second harmonic blocking method to prevent the malfunction caused by the TMIC. However, the 50/51 IED may malfunction caused by the TMIC. To solve that problem, the proposed method uses a GOOSE inter-lock signal between two IEDs. The 87T IED transmits a blocking GOOSE signal to the 50/51 IED, when the TMIC is detected. The proposed method can make a cooperation of digital substation protection system more intelligent. To verify the performance of proposed method, this paper performs the real time test using the RTDS (Real Time Digital Simulator) test-bed. Using the RTDS, the power system transients are simulated, and the TMIC is generated. The performance of proposed method is verified in real-time using that actual current signals. The reaction of simulated power system responding to the operation of IEDs can be also confirmed.
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.
Construction of largest equivalent systems for power system simulator
Kim, Y. H.,Cha, S. T.,Lee, J. W.,Kim, T. K.,Choo, J. B.,Nam, H. K. John Wiley Sons, Ltd. 2006 European transactions on electrical power Vol.16 No.1
<P>This paper presents the dynamic reduction algorithm including network reduction for large-scale power systems to develop the largest equivalent systems. In particular, the proposed reduction algorithm is suitable for the real time digital simulator. The load angle of the synchronous machine is used as a state variable to identify or aggregate the coherent synchronous machine groups. In this paper, the equivalent systems that preserve the desired property of the original systems are evaluated to verify the algorithm with dynamic simulation for given power system faults. The results of comparison between the original systems and equivalent systems are described to provide the accuracy and reliability. Copyright © 2005 John Wiley & Sons, Ltd.</P>
초전도 전력기기의 계통적용을 위한 실시간 시뮬레이션 기법 개발 (PART 1 : 고온초전도 전력 케이블)
김재호,박민원,박대진,강진주,조전욱,심기덕,유인근,Kim, Jae-Ho,Park, Min-Won,Park, Dae-Jin,Kang, Jin-Ju,Cho, Jeon-Wook,Sim, Ki-Deok,Yu, In-Keun 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.11
High temperature superconducting(HTS) power cable is expected to be used for power transmission lines supplying electric power for densely populated cities in the near future. Since HTS power cable is capable of the high current density delivery with low power loss, the cable size can be compact comparing with the conventional cable whose capacity is same. In this paper, the authors propose the real time simulation method which puts a teal HTS wire into the simulated 22.9 kV utility grid system using Real Time Digital Simulator (RTDS). For the simulation analysis, test sample of HTS wire was actually manufactured. And the transient phenomenon of the HTS wire was analyzed in the simulated utility power grid. This simulation method is the world first trial in order to obtain much better data for installation of HTS power device into utility network.
RTDS를 이용한 독립형 마이크로그리드의 실시간 동작 분석
이윤석(Yoon-Seok Lee),한병문(Byung-Moon Han),원동준(Dong-Jun Won),이학주(Hak Ju Lee) 대한전기학회 2014 전기학회논문지 Vol.63 No.10
In this paper the operational characteristics of stand-alone microgrid was analyzed using RTDS simulation models. The accuracy of developed simulation models were verified by comparing with the analysis results using the PSCAD/EMTDC simulation models. The proper scenarios and operation algorithms were developed and analyzed in accordance with various situations that can occur in the actual system, so as to establish operation scheme for the stand-alone microgrid system. The developed simulation models can be effectively utilized to design a newly installed stand-alone microgrid and to develop various operation scenarios for stand-alone microgrid. And these models can be applied for analyzing the transient phenomena due to system fault so that system protection can be properly designed.
Field Implementation of Voltage Management System (VMS) into Jeju Power System in Korea
Jeonghoon Shin,Suchul Nam,Jiyoung Song,Jaegul Lee,Sangwook Han,Baekkyung Ko,Yongho An,Taekyun Kim,Byungjun Lee,Seungmook Baek 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
This paper presents the results of field tests on Voltage Management System (VMS) using hybrid voltage control, which utilizes coordinated controls of various reactive power resources such as generators, FACTS and switched shunt devices to regulate the pilot bus voltage in a voltage control area. It also includes the results of performance test on RTDS-based test bed in order to validate the VMS before installing it in Jeju power system. The main purpose of the system is adequately to regulate the reactive power reserve of key generators in a normal condition with coordination of discrete shunt devices such as condensers and reactors so that the reserves can avoid voltage collapse in emergency state in Jeju system. Field tests in the automatic mode of VMS operation are included in steady-states and transient states. Finally, by the successful operation of VMS in Jeju power system, the VMS is proved to effectively control system voltage profiles in steady-state condition, increase system MVAR reserves and improve system reliability for pre- and post-contingency.
Field Implementation of Voltage Management System (VMS) into Jeju Power System in Korea
신정훈,남수철,송지영,이재걸,한상욱,고백경,안용호,김태균,이병준,백승묵 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
This paper presents the results of field tests on Voltage Management System (VMS) using hybrid voltage control, which utilizes coordinated controls of various reactive power resources such as generators, FACTS and switched shunt devices to regulate the pilot bus voltage in a voltage control area. It also includes the results of performance test on RTDS-based test bed in order to validate the VMS before installing it in Jeju power system. The main purpose of the system is adequately to regulate the reactive power reserve of key generators in a normal condition with coordination of discrete shunt devices such as condensers and reactors so that the reserves can avoid voltage collapse in emergency state in Jeju system. Field tests in the automatic mode of VMS operation are included in steady-states and transient states. Finally, by the successful operation of VMS in Jeju power system, the VMS is proved to effectively control system voltage profiles in steady-state condition, increase system MVAR reserves and improve system reliability for pre- and post-contingency.
Field Implementation of Voltage Management System (VMS) into Jeju Power System in Korea
Shin, Jeonghoon,Nam, Suchul,Song, Jiyoung,Lee, Jaegul,Han, Sangwook,Ko, Baekkyung,An, Yongho,Kim, Taekyun,Lee, Byungjun,Baek, Seungmook The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
This paper presents the results of field tests on Voltage Management System (VMS) using hybrid voltage control, which utilizes coordinated controls of various reactive power resources such as generators, FACTS and switched shunt devices to regulate the pilot bus voltage in a voltage control area. It also includes the results of performance test on RTDS-based test bed in order to validate the VMS before installing it in Jeju power system. The main purpose of the system is adequately to regulate the reactive power reserve of key generators in a normal condition with coordination of discrete shunt devices such as condensers and reactors so that the reserves can avoid voltage collapse in emergency state in Jeju system. Field tests in the automatic mode of VMS operation are included in steady-states and transient states. Finally, by the successful operation of VMS in Jeju power system, the VMS is proved to effectively control system voltage profiles in steady-state condition, increase system MVAR reserves and improve system reliability for pre- and post-contingency.