• 제목/요약/키워드: AGC

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Optimal AGC Control Parameter Tuning (자동발전제어(AGC) 최적튜닝에 관한 연구)

  • Oh, Chang-Soo;Song, Suk-Ha;Lee, Woon-Hee
    • Proceedings of the KIEE Conference
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    • 2008.11a
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    • pp.321-322
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    • 2008
  • Co-optimization of Gen. Speed Governor & AGC are essential to control proper Frequency control & Economic Dispatch. Improper AGC Control result in the decrease of Electricity frequency quality & Generator Life cycle by over-regulating each Generator. This paper presents a number of AGC Area/PLC parameter tuning technique & better performance results. This optimal tuning was studied & implemented by System Operation Dept Korea Power Exchange in 2007.

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Application of New AGC to the Cold Rolling Mills of Pohand Works ((포항)냉연 New AGC 적용기술)

  • 김철종;이동섭;박남수
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1999.08a
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    • pp.150-157
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    • 1999
  • As the customer demands thickness quality stricter, new techniques of automatic thickness control(AGC), is adopted to continuous cold rolling mills. The cold rolling mills of Pohang Works have revamped the existing conventional AGC system that control the thickness at all-stands automatically by the mass flow AGC based on the measurement of strip-speed and thickness between mill stands. The No. 2 Cold Rolling Mill be has adopted the New AGC system since Oct. 1995, and The No.1 Cold Rolling Mill since June. 1999. Thanks to the New AGC system, precise control of thickness is possible not only at constant rolling speed region, but also during line speed up and down. This report describes application techniques of the New AGC system and performance of the system.

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On the AGC Design of Wireless Communication Systems (무선통신 시스템에서 AGC 알고리즘 연구)

  • 예충일;김환우
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.15 no.6
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    • pp.567-572
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    • 2004
  • This paper shudies an automatic gain control(AGC) algorithm used in wireless communication cellular systems. The AGC design includes the selection of the appropriate analog-to-digital converter(ADC) and keeping the input power to the ADC constant to minimize the quantization noise generated from the analog-to-digital conversion process. In this paper the process to determine the required precision or the An is illustrated and the method to set the design parameters of the AGC is proposed. And the validity of the proposed algorithm is verified by computer simulation.

Evaluation of AGC Characteristics and a Novel AGC Control Strategy for Independent Power Systems (단독계통의 주파수 제어를 위한 자동발전제어(AGC) 특성 분석 및 새로운 제어전략)

  • Choi, Seung-Ho;Hwang, Kyo-Ik;Chun, Yeonghan
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.54 no.11
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    • pp.540-547
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    • 2005
  • One of the roles of AGC is to regulate the frequency of power systems. AGC is also used to control the frequency of Korean Power System. AGC control strategies depend on system characteristics and the requirements of the systems to which those are applied. Korean Power System consists of one control area and does not have tie-lines. In this research, an AGC control strategy is suggested to avoid conflict with governor dynamics and to enhance frequency recovery It shows good performance for regulation and frequency recovery. This control strategy is expected to be applied to New EMS in KPX to get reasonable AGC regulation and frequency recovery performance.

Burst Mode AGC Loop and Preamble Detector for VDL Mode-2 (VDL Mode-2 를 위한 버스트 모드 AGC 루프 및 프리엠블 검출기)

  • Gim, Jong-Man;Eun, Chang-Soo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.7C
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    • pp.706-714
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    • 2009
  • In this paper, we proposed a burst mode AGC loop and preamble detector applicable for VDL(VHF Digital Link) mode-2 using D8PSK modulation scheme and the performance analysis of proposed schemes is described. Generally the AGC scheme can be divided into two types, continuos and burst mode AGC. The continuos mode is performed well only with an analog feedback AGC loop. But the analog feedback AGC loop is not suitable for burst mode since its gain lock time is more than preamble duration, which causes the preamble detector misses preamble. Hence a fast digital AGC loop is required for burst mode. Also the AGC loop has to be designed with full gain during idle time to detect bursts although the signal level is very low. If the time to acquire gain lock is slow, the preamble detector fail to detect burst due to saturation of a lot of preamble samples. The receiver performance might be down even if the burst was detected because the preamble is used to estimate several parameters need to demodulation at receiver. In this paper we analysed relationships between the AGC loop and preamble detector. we present an AGC loop and preamble detector in burst mode.

A Consideration on the AGC Operation under the Wholesale Market (도매경쟁전력시장하에서의 AGC 운용체계에 대한 고찰)

  • Kwon, S.M.;Cheon, J.M.;Jeon, D.H.;Shin, J.S.;Lee, H.S.
    • Proceedings of the KIEE Conference
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    • 2002.07a
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    • pp.354-356
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    • 2002
  • In this paper a technical consideration is made on the AGC operation under the wholesale market in Korea in view of the signal connection between EMS and power plants for AGC. We review the market rules related AGC operation first. Then we investigate the current AGC connection to measure the level of the satisfaction for the every term in the rules.

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The development of IF amplifier having low noise and wide AGC range (저잡음 및 넓은 자동 이득 제어 영역을 갖는 IF 증폭기의 설계)

  • 이흥배;엄두찬;김용석;정연철
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.31B no.10
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    • pp.73-81
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    • 1994
  • It is AGC(Automatic Gain Control) amplifier to decide characteristics of IF(Intermediate Frequency) processing IC. When demodulated IF signal by PLL type demodulator, the amplitude of input singla should be maintained at a certain amplitude. The AGC amplifier is an important factor to achieve this condition. The AGC amplifier needs the wide dynamic range, the wide AGC range and better noise characteristics. We designed the AGC amplifier to satisfy these characteristics.

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A Real-time Distributed AGC System for a Hot Strip Mill (실시간 분산 열연 두께제어 시스템의 설계 및 현장적용)

  • Lee, Ho-Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.23 no.6 s.165
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    • pp.922-930
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    • 1999
  • This paper describes a new 14-CPU real-time distributed automatic gauge control (AGC) system for POSCO's No. 2 Hot Strip Mill at Pohang Works. The new AGC system has adopted gaugemeter AGC, Monitor AGC, and roll gap disturbance compensators. The computer system for the new AGC system has been developed based on VMEbus computer systems and a commercial real-time operating system. A VMEbus computer system is also used for the position servo control of hydraulic cylinders. All the application programs and input/output signals have been reasonably distributed over the control computer systems for the maximum reliability and effectiveness of the system. The new AGC system has been successfully used for the No. 2 Hot Strip Mill.

Development of Feed-forward AGC using Adaptive Control Algorithm (적응기법을 이용한 Feed-forward AGC 기술 개발)

  • 홍성철;이영교
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.05a
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    • pp.168-171
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    • 2003
  • Generally RF AGC (Roll Force Automatic Gauge Control) controls the roll gap using the variation of rolling force caused by the roll eccentricity and the entry thickness of material, but RE AGC takes the bad effect of the roll eccentricity. The Feed-forward (FF) AGC method, which controls the next stand roll gap by the estimation of the thickness variation due to skid mark is needed to supplement the shortage of RF AGC. In this paper, an adaptive filtering method which takes account of the kind of material, the final objective thickness and the rolling speed is proposed to predict skid mark thickness variation. In addition, an improved estimation method of control point using a speedometer and looper angle is suggested. Via on line test, the performance improvement of the suggested FF AGC method is verified.

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Introduction of Generator Unit Controller and Its Tuning for Automatic Generation Control in Korean Energy Management System (K-EMS)

  • Park, Min-Su;Chun, Yeong-Han
    • Journal of Electrical Engineering and Technology
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    • v.6 no.1
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    • pp.42-47
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    • 2011
  • Automatic generation control (AGC) is an important function for load frequency control, which is being implemented in Energy Management System (EMS). A key feature of AGC is to back up governors to enhance the performance of frequency control. The governor regulates system frequency in several to ten seconds, while the droop control concept results in steady-state control error. AGC is a supplementary tool for compensation of the steady-state error caused by the droop setting of the governors. As the AGC target is delivered to each generator as an open loop control target, the generator output is not guaranteed to follow the AGC target. In this paper, we introduce generating unit controller (GUC) control block, which has the purpose of enabling the generator output to track the AGC target while maintaining the governor performance. We also address the tuning methods of GUC for better performance of AGC in the Korea Energy Management System (K-EMS).