• Title/Summary/Keyword: Load control

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A Configuration of DLC(Direct Load Control) Using TCP/Ethernet Module And Load Control Method ( I ) (TCP/Ethernet방식을 이용한 DLC(Direct Load Control)의 구성 및 부하제어기법 ( I ))

  • Kim, Hyong-Joong;Kim, In-Soo;Park, Kyu-Hyu;Cha, Yang-Hwan
    • Proceedings of the KIEE Conference
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    • 2000.07a
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    • pp.570-572
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    • 2000
  • In this paper, we present the configuration of Direct Load Control System using TCP/Ethernet Module for the Load Management Europe and America has operated the DLC system by many communication system, and Taiwan, Japan has controlled the cooling load at peak hours of power system. Up to now, Many Researches for the DLC of communication method, so called, pager, power line carrier, ripple control, etc. has advanced. Now, we present new communication method for the DLC using TCP/Ethernet module which is widespread all over the world.

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Load Position and Residual Vibration Control of an Offshore Crane System Based on Input-Output Linearization Theory

  • Le, Nhat-Binh;Lee, Kwon-Soon;Kim, Young-Bok
    • Journal of Navigation and Port Research
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    • v.41 no.5
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    • pp.337-344
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    • 2017
  • In the offshore crane system, the requirements on the operating safety are extremely high due to many external factors. Rope extension is one of the factors producing vertical vibration of load. In this study, the load is carried by the motor-winch actuator control and the rope is modeled as a mass-damper-spring system. To control the load position and suppress the vertical vibration of the load, a control system based on input-output linearization method is proposed. By the simulation and experiment results with pilot crane model, the effectiveness of proposed control method is evaluated and verified.

Parameters Estimation Characteristics of Five-Phase Squirrel-Cage Induction Motor within Over Current Load (과전류 부하에서 5상 농형 유도전동기의 정수 특성)

  • Kim, Min-Huei
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.7
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    • pp.38-46
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    • 2015
  • This paper propose a variable parameter estimations for variable over current load of five-phase squirrel-cage induction motor(IM) to servo control system. In order to high performance control of AC motor using a field oriented control(FOC) and direct torque control(DTC) algorithm, there are required precise motor parameters for slip calculation, flux observer, controller gain, torque command of current components, rotor position, speed estimation, and so on. We are suggest a analyzed estimation results of the motor parameters that developing five-phase squirrel-cage IM have a stator of concentrated winding for experimental within variable over current load at rated input frequency. There are results of stator winding measurement, no-load test, locked-rotor test, variable over current load test, and estimated parameters of equivalent circuits using manufactured experimental apparatus by IEEE Standard Test Procedure for Polyphase Induction Motors and Generators 112-2004.

POWER LOAD MANAGEMENT FOR PEAK LOAD CLIPPING (POWER LOAD DIRECT CONTROL METHOD) (Peak부하(負荷) 억제(抑制)를 위한 전력부하관리(電力負荷管理) (전력부하(電力負荷) 직접제어방식(直接制御方式)))

  • Kim, Yeong-Han;Lee, Hyo-Sang;Kim, Jai-Young
    • Proceedings of the KIEE Conference
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    • 1989.07a
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    • pp.246-250
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    • 1989
  • Owing to the rapid development of economy and the higher living standard of people, electricity demands have growth and the peak load has been increased rapidly. To cope with this impacts and to reduce the cost of service,utilities are conserned about power load management program. This paper shows a scheme of power load control and the basic structure of direct load control system. And also radio control method using the public pager which is one of the best economical and serviceable method in techniques will be introduced briefly.

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Efficient Promoting Plans of Direct Load Control Programs (직접부하제어 프로그램의 효율적 추진방안)

  • Park, Jong-Jin;Rhee, Chang-Ho;Lee, Keun-Dae
    • Proceedings of the KIEE Conference
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    • 2002.07a
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    • pp.292-294
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    • 2002
  • Load management programs was initiated in the 1970s to actively influence customer load in the United States. Generally, load management programs can be categorized into direct load control(DLC), indirect load control(IDLC), and energy storge system(ESS). The DLC allows the utilities to shed remote customer demand unilaterally Direct load control(DLC) has lately attracted considerable attention. This paper suggests efficient promoting plans of DLC, which has a lot of advantages. The importance of DLC will be increased more and more. Therefore, various studies of DLC activation plans have to be continued.

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Load Control Device for VVVF Inverter Testing (인버터 시험을 위한 부하제어 장치)

  • Kim, Gil-Dong;Lee, Han-Min
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.675-679
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    • 2007
  • The control method of programmable dynamometer for overall test of machine is to load reference torque which is computed from torque transducer into motor under test. But the torque information detected from torque transducer have a lot of noise when the load torque of moter is a small quantity or changing. Thus, torque transducer must have a low pass filter to detect a definite torque information. But The torque delay generated by filter with torque transducer occur a torque trouble for moter torque of programmable dynamometer. Therefore, this kind of system could not perform dynamic and nonlinear load. In this paper, the control method using the load torque observer without a measure for torque transducer is proposed. The proposed system improved the problem of the torque measuring delay with torque transducer, and the load torque is estimated by the minimal order state observer based on the torque component of the vector control induction moter. Therefore, the torque controller is not affected by a load torque disturbance.

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Ramp Load/Unload Velocity Control of VCM Using BEMF in HDD (램프 로드/언로드 HDD의 역기전력을 이용한 VCM 속도 제어)

  • 정준;강태식;김태수;정광조;이철우
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.05a
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    • pp.730-735
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    • 2004
  • Nowadays, most small form-factor drives adapt a load/unload mechanism and the flying height of the head becomes more and more low. So, the load/unload velocity also becomes one of the important factors to ensure the reliability of the load/unload operation. To control the load/unload velocity accurately, velocity sensing is most important because there is no special velocity sensor during the load/unload operation. In this paper, we proposed a very practical method that measures the velocity from the BEMF voltage of a VCM. Then, the proposed method is applied to the load/unload velocity control using 2.5' drives in order to verify its usefulness.

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A Study of Optimal Load Follow Control in Pressurized Water Reactors (감압경수형 원자로의 최적부하추종제어에 관한 연구)

  • 김락규;박상휘
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.34 no.12
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    • pp.491-497
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    • 1985
  • An applicaton of the linear optimal control theory to the problem or load follow control in pressurized water reactors (PWR) is investigated. In order to perform the steady-state and load follow operation in PWR, a nonlinear model for the reactor and steam generator is derived and linearized at 50% rated power. Simulation tests are performed for 10% demanded load. Comparing the dynamic response of the newly developed optimal load follow controller with those of the integral error feedback controller proposed by Yang, the rise time of dynamic response of the former is about 15 seconds faster than those of the latter, thus the results indicate that the fast response of the optimal load follow controller is verified. The results of this work are directly applicable to the design of the load follow control systems for commercially operated PWRs.

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Load Frequency Control by Optimal Linear Tracking (최적선형 추적법에 의한 부하-주파수제어)

  • 김훈기;곽노홍;문영현
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.38 no.2
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    • pp.83-92
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    • 1989
  • This paper presents a load frequency control by optimal linear tracking, which can be well adapted to practical power systems with successive load disturbances. Conventional Load Frequency Controls (LEC's) have a feedback control scheme of the state error deviated from the post-disturbance steady state. This requires the modification of reference everytime the system encounters load changes. In this study, a new feedback scheme of LEC is developed by using the optimal linear tracking method with a fixed reference. As a result, the proposed LFC, which requires no reference modification, can be efficiently applied to power systems with successive disturbances such as load changes due to the on-off operations of reclosers or feeder switches. Another feature of the proposed LFC is that it adopts an algorithm to calculate an optimal post-fault steady state with the consideration of control input changes. The proposed LFC has been tested for a 2-area power system, which shows that it can be well adapted to successive load disturbances with good frequency response.

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Control Method for Cut-out of Shorted Load in the Auxiliary Power Supply (보조전원장치의 단락부하 차단기 개방을 위한 제어방법)

  • 황광철;조국춘;최종묵
    • Proceedings of the KSR Conference
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    • 1998.11a
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    • pp.249-254
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    • 1998
  • This paper describes the control methods to cut out the NFB(No Fuse Breaker) of shorted load in the auxiliary power supply, Generally, when the short-circuit occurs in the load of the auxiliary power supply, the auxiliary power supply stops the operation according to the protection sequence. Finally, the other auxiliary power supply stops the operation by the same fault, To resolve this problem, we suggest the control method to trip the NFB of shorted load. That is, when the short circuit occurs, the controller changes control mode from voltage mode to current mode without the operation of output contactor(SIVK) in the auxiliary power supply. The auxiliary power supply provides a large current for the short-circuit load. After some time, the NFB of the short-circuit load is cut off and the auxiliary power supply Provides stable voltage for the loads except for the short-circuit load.

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