• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 추계학술대회 논문집 전력기술부문
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• pp.192-194
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• 2005

Power system restoration following a massive blackout starts with reenergizing of primary transmission lines. This paper presents the restoration and training system for Jeju network using RTDS. System operators can simulate the jeju restorative procedures from primary transmission lines to ail the system topology written by KPX in the real time. Owing to the efficient restoration training by the system, It is expected to restore the power system rapidly and accurately when a massive blackout occurs, and also the system helps student understand the restoration method.

• 대한전기학회논문지:전력기술부문A
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• 제55권5호
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• pp.191-194
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• 2006

Power system restoration following a wide area or complete blackout starts with energizing primary restorative transmission systems. During this primary restoration process, unexpected over-voltage may happen due to nonlinear interaction between the unloaded transformer and the transmission system. This is known as the harmonic resonance phenomenon that may cause burning out of transformer or other devices. Since the harmonic resonance originates from the nonlinear characteristics, it is very difficult to predict the occurrence of this phenomenon. This paper reports the analyses of the harmonic resonance occurred in domestic power system. Various analyses and results of the harmonic over-voltage is presented based on the PSCAD/EMTDC simulations.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
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• pp.105-106
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• 2006

KEPRI has completed to develop KP-ROTS Ver 1.1 and applied to 12 power transmission district offices and Je-ju branch office in KEPCO, which was updated from the exiting power restoration training simulator related to power restoration project. This program has functions such as black-start line analysis for all network blackout, restoration training on wide blackout and simple study on outage plans. KEPCO expects that local operators will train well for restoration procedures against wide blackout by using KP-ROTS.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전력기술부문
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• pp.308-310
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• 2001

This paper is to introduce a more effective and flexible restoration algorithm composed to the fault preventing and restoring system now in use. This was possible by considering the changes that can occur by the proper or the improper run of the Feeder, which the power system restoration method now using didn't consider. The new algorithm uses the method minimizing the loss with respect to the load changes occuring when the power system is restored, rather than just simply following the SOP that is only composed of a single Feeder On/off combination. This can present the more effective power system running method for the safer subway running and passenger transport, by giving the system operator the chance to choose between the SOP and the minimum loss method.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2019년도 전력전자학술대회
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• pp.416-417
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• 2019

In this paper, an effective power flow control strategy (PFCS) based on the centralized control approach and a DC-link (DCV) restoration algorithm for DC microgrid (DCMG) are presented. By investigating the statuses of system power units, eleven operating modes are given to ensure the system power balance under various conditions. To avoid the system power imbalance caused by the delay of grid fault detection, a reliable DCV restoration algorithm is proposed. In the proposed scheme, when an abnormal variation of the DCV is detected, the battery instantly starts a local emergency control mode to restore the DCV to the nominal value regardless of the control mode from the central controller. The simulations and experiments are carried out to prove the effectiveness of the PFCS and the proposed DCV restoration algorithm.

• 조명전기설비학회논문지
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• 제20권9호
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• pp.18-23
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• 2006

This paper presents an operator training simulator for power system restoration against massive blackout. The system is designed especially focused on the generality and convenient setting up for initial condition of simulation. The former is accomplished by using power flow calculation methodology, and PSS/E data is used to set up the initial state for easy setting. The proposed simulator consists of three major components-a power flow(PF), a data conversion(CONV), and, a GUI module. The PF module calculates power flow, and then checks over-voltages of buses and overloads of lines. The CONV module composes a Y-Bus array and a database at each restoration action. The initial Y-Bus array is composed from PSS/E data. A user friendly GUI module is developed including a graphic editor and a built-in operation manual. The maximum processing time for one step operation is 15 seconds, which is adequate for training purpose.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
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• pp.276-278
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• 1998

This paper introduce an algorithm for service restoration in electric power distribution systems. Power utility performs service restoration in order to restore out-of-service areas at fault. Developing effective service restoration program is a cost-effective approach to improve service reliability and to enhance customer satisfaction. The main objective in service restoration program is to restore as much load as possible by transferring de-energized loads via network reconfigurations to other supporting distribution feeders without violating operating and engineering constrains.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 A
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• pp.486-488
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• 2000

This paper presents a methodology to evaluate the restoration capability of the feeder and its applications to the system planning and operation in the normal and emergency states. The proposed method is very simple and practical, so its application to the real system operation is expected to increase the system reliability.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 A
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• pp.181-183
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• 2003

This paper presents an operator training simulator for power system restoration against massive black-out. The system is designed especially focused on the generality and convenient setting up for initial condition of simulation. The former is accomplished by using on line calculation methodology, and PSS/E data is used to define the initial situation. The proposed simulator consists of three major components - the Power flow(PF) module, data conversion(CONV) module and CUI subsystem. PF module calculates power flow, and then checks overvoltage of buses and overflow of lines. CONV module composes an Y-Bus array and a data base at each restoration action. The initial Y-Bus array is constructed from PSS/E data. The user friendly GUI module is developed including graphic editor and built-in operation manual. As a result, the maximum processing time for one step operation is 15 seconds, which is adequate for training purpose. Comparison with PSS/E simulation proves the accuracy and reliability of the training system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.149-151
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• 2011

This paper describe that restoration ability raising method of power system operator when Power System fault happen. This paper introduce score management method about simulation training when supposed fault happened and essencial fault have to be trained for power system operator.