• Title, Summary, Keyword: FACTS

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SSR Control by Damping Controller of TCSC (TCSC의 Damping 제어를 이용한 SSR 제어)

  • Jeon, Jin-Hong;Chun, Yeong-Han;Kim, Ji-Won;Kim, Tai-Hyun;Kim, Hak-Man;Kook, Kyung-Soo
    • Proceedings of the KIEE Conference
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    • pp.142-144
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    • 2000
  • This paper presents an auxiliary TCSC controller designed for damping SSR. Damping controller for SSR is designed in frequency domain for suppressing resonance. The SSR phenomenon and the performance of damping controller simulated by using PSCAD/EMTDC. In this simulation. the power system model for SSR is IEEE benchmark Model and TCSC is simplified to controllable impedance model.

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Modeling and Control of VSI type FACTS controllers for Power System Dynamic Stability using the current injection method

  • Park, Jung-Soo;Jang, Gil-Soo;Son, Kwang-M.
    • International Journal of Control, Automation, and Systems
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    • v.6 no.4
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    • pp.495-505
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    • 2008
  • This paper describes modeling Voltage Sourced Inverter (VSI) type Flexible AC Transmission System (FACTS) controllers and control methods for power system dynamic stability studies. The considered FACTS controllers are the Static Compensator (STATCOM), the Static Synchronous Series Compensator (SSSC), and the Unified Power Flow Controller (UPFC). In this paper, these FACTS controllers are derived in the current injection model, and it is applied to the linear and nonlinear analysis algorithm for power system dynamics studies. The parameters of the FACTS controllers are set to damp the inter-area oscillations, and the supplementary damping controllers and its control schemes are proposed to increase damping abilities of the FACTS controllers. For these works, the linear analysis for each FACTS controller with or without damping controller is executed, and the dynamic characteristics of each FACTS controller are analyzed. The results are verified by the nonlinear analysis using the time-domain simulation.

Installation of MFC(Multiple FACTS Coordinated control) On-line System for the Spinning Reserve of a Reactive Power in Metropolitan Area (수도권 순동 무효전력 확보를 위한 FACTS 협조제어 시스템 온라인 설치)

  • Chang, Byung-Hoon;Moon, Seung-Pil;Ha, Yong-Gu;Jeon, Woong-Jae
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.12
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    • pp.2131-2134
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    • 2010
  • In this paper, the on-line system schemes for coordinated control system of multiple FACTS were presented to enhance the voltage stability around the metropolitan areas. In order to coordinated control system of FACTS devices, MFC on-line system calculates the optimal set point(Vref, Qrev) of FACTS devices using the coordinated control algorithm with real time network data which is transferred from SCADA/EMS system. If the system is unstable after contingencies, the new operation set-point of FACTS would be determined using bus sensitivity from tangent vector at voltage instability point. Otherwise, we would determine the new operation set-point of FACTS for considering economical operation, like as active power loss minimization using Optimal Power Flow algorithm. As the test, MFC(Multiple FACTS Coordinated control) on-line system will be installed in Korea power system.

Improvement of Line Protection Methods by Dynamic Analysis on a FACTS-compensated transmission line (FACTS 보상 송전선의 동적 해석을 통한 송전선 보호 방안 개선)

  • Lim Jung-Uk;Runolfsson Thodur
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.54 no.12
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    • pp.573-579
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    • 2005
  • Dynamic analysis of a transmission line which is compensated by a FACTS device such as STATCOM, SSSC and UPFC is carried out in this paper and the impacts on conventional line protection methods such as the DCPM (Differential Current Protection Method) and the DPM (Distance Protection Method) are reviewed. A refined DCRM is proposed to detect faults properly regardless of the FACTS operation. The proposed method is applied to a FACTS-compensated line with a variety of faults and is verified by simulation results. An adaptive DPM on a FACTS-compensated line was proposed previously in the literature. In order to emphasize the necessity of the modified DPM, the conventional DPM is applied to a FACTS-compensated system. Significant factors such as fault types, fault locations, and fault resistances as well as FACTS device types are considered for relaying setting.

A Study on the Sequence of Teaching Multiplication Facts in the Elementary School Mathematics (초등수학에서의 곱셈구구 지도 순서에 대한 고찰)

  • Kim, Sung Joon
    • East Asian mathematical journal
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    • v.32 no.4
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    • pp.443-464
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    • 2016
  • The purpose of ths study is to compare and analyze the sequence of teaching multiplication facts in the elementary school mathematics. Generally, the multiplication in the elementary school mathematics is composed of the followings; concepts of multiplication, situations involving multiplication, didactical models for multiplication, and multiplication strategies for teaching multiplication facts. This study is focusing to multiplication facts, especially to the sequence of teaching and multiplication strategies. The method of this study is a comparative and analytic method. In order to compare textbooks, we select the Korean elementary mathematics textbooks(1st curriculum~2009 revised curriculum) and the 9 foreign elementary mathematics textbooks(Japan, China, Germany, Finland, Hongkong etc.). As results of comparative investigation, the sequence of teaching multiplication facts is reconsidered on a basis of elementary students' mathematical thinking. And the connectivity of multiplication facts is strengthened in comparison with the foreign elementary mathematics textbooks. Finally multiplication strategies for teaching multiplication facts are discussed for more understanding and reasoning the principles of multiplication facts in the elementary school mathematics.

UPFC Control for Power System Damping Reduction (계통동요 제어를 위한 UPFC제어기)

  • Yoon, Jong-Su;Yoon, Yong-Beum;Moon, Gun-Woo;Yoon, Seok-Ho;Choo, Jin-Boo
    • Proceedings of the KIEE Conference
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    • pp.256-258
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    • 1998
  • This paper presents a control system design for the UPFC of FACTS devices by optimal control scheme to enhance small-signal stability in the Power system. The feature of this UPFC controller is coordinated with generator exciter controller(AVR, PSS) to improve the total Power system stability and performance.

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Development of the Dynamic Voltage Restorer Prototype (Dynamic Voltage Restorer Prototype 개발)

  • Kim, Ji-Won;Chun, Yeong-Han;Jeon, Jin-Hong
    • Proceedings of the KIEE Conference
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    • pp.101-103
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    • 2000
  • 산업의 발달과 각종 기기의 고도화 및 정밀화에 의하여 전원에 민감한 기기들이 많은 산업 현장에 사용 되게 되었다. 이러한 민감한 기기는 입력 전원에 매우 민감하여 일반적인 정전뿐만 아니라 순간적으로 입력전압의 크기가 작아지는 순간전압강하에도 큰 영향을 받게된다. 본 논문에서는 전원측에서 순간전압강하가 발생하는 경우 부하에 영향을 미치지 않도록 하는 DVR에 대해서 제어알고리즘을 제시하고 시뮬레이션과 실험을 통하여 그 알고리즘의 타당성을 검증하였다.

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A Comprehensive Survey of Optimal Placement and Coordinated Control Techniques of FACTS Controllers in Multi-Machine Power System Environments

  • Singh, Bindeshwar;Sharma, N.K.;Tiwari, A.N.
    • Journal of Electrical Engineering and Technology
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    • v.5 no.1
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    • pp.79-102
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    • 2010
  • This paper presents exhaustive review of various methods/techniques for coordinated control between FACTS controllers in multi-machine power systems. It also reviews various techniques/methods for optimal choice and allocation of FACTS controllers. Authors strongly believe that this survey article will be very much useful to the researchers for finding out the relevant references in the field of placement and coordination of FACTS Controllers.

The Enhancement of Power System Security Using flexible AC Transmission Systems (FACTS) (FACTS 기기를 이용한 전력시스템의 안전도 향상)

  • 송성환;임정욱;문승일
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.3
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    • pp.165-172
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    • 2003
  • This paper presents an operation scheme to enhance the power system security by applying FACTS on Power systems. Three main generic types of FACTS devices are suggested an illustrated. Flow congestions over lines have been solved by controlling active power of series-compensated FACTS devices and low voltages at buses have been solved by controlling reactive power of shunt-compensated FACTS devices. Especially, Especially, UPFC has been applied in both line congestion and low voltages. Two kinds of indices which indicate the power system security level related to line flow and bus voltage are utilized in this paper. They have been minimized to enhance the power system security level through the iterative method and the sensitivity vector of security index is derived to determine the direction to minimum. The proposed algorithm has been tested on the IEEE 57-bus system with FACTS devices in a normal condition and a line-faulted contingency.

An Algorithm for Transfer Capability Evaluation in Power Systems with FACTS Device (FACTS적용계통에서의 송전용량 평가 알고리즘)

  • Yoon, Yong-Beum;Yoon, Jong-Su;Choo, Jin-Boo
    • Proceedings of the KIEE Conference
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    • pp.880-883
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    • 1998
  • In this paper, sensitivity based approach to estimate BITC(bilateral interchange transfer capacity) considering the real power flow control function of FACTS device is presented. The real power flow setting of the FACTS device is adjusted so that it transfer the power flow from the first violation point of transmission capacity to other transmission lines in the power system, thus allowing more power to be transferred from the specified generator bus to the specified load bus. The transfer between the two bus locations is increased from this new operating condition until a violation of transmission capacity limits occurs or until the setting of the FACTS device can no longer be adjusted. The proposed algorithm is illustrated using examples of small and real life power system.

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