• Title/Summary/Keyword: Load control

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A Study of Load Control for Missile Guidance on Load Control Model (하중 제어 모델에서의 미사일 유도 법칙 하중 제어에 관한 연구)

  • Wang, Hyun-Min;You, Jeong-Bong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.6
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    • pp.1585-1591
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    • 2008
  • Recently it is tried to use load control for maneuver moving object. MIN design method proposed to solve control problem of nonlinear system using load concept. Min design method shows direct method for finding control value on the load control model. In this paper, is shown load control value for problem of line of sight on missile guidance. The load control value keep given velocity of missile and angle of attack for tracking target.

Speed Control of Induction Motors Using Load Torque Feedforward Control (부하토크 피드포워드 제어를 이용한 유도전동기의 속도제어)

  • 서영수;성대용;임영배
    • The Transactions of the Korean Institute of Power Electronics
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    • v.3 no.2
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    • pp.99-106
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    • 1998
  • This paper proposed a speed control system for induction motors robust to variations in torque and parameters by feedforward compensating the current portion of load torque, adding a load torque observer to the conventional PI controller in the indirect vector controlled induction motor system. Computer simulations and exeperimental works using the proposed control confirm that the transient response for the variation of the reference speed and load torque becomes improved, compared with the conventional PI controled method.

Speed Control of Induction Motor Using Load Torque Feedforward Control (부하토크 피드포워드 제어를 이용한 유도전동기의 속도제어)

  • 서영수;임영배;김영춘;성대용;김종균
    • Proceedings of the KIPE Conference
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    • 1997.07a
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    • pp.152-155
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    • 1997
  • This thesis proposed a speed control system for induction motors robust to variations in torque and parameters by feedforward compensating the current portion of load torque, adding a load torque observer to the conventional PI controller in the indirect vector controlled induction motor system. In conclusion, this thesis demonstrate the improved transient characteristic to variations in reference speed and load torque, compared to the conventional PI control method, by means of the feedworward control of the estimated load torque.

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A study on the Implementation of a Remote Control System for Peak Load Clipping (첨두부하 억제를 위한 원격부하제어시스템 개발 및 적용에 관한 연구)

  • Cho, Seon-Ku;Moon, Hong-Suk;Yoon, Kap-Koo;Lee, Won-Bin
    • Proceedings of the KIEE Conference
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    • 1995.11a
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    • pp.165-168
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    • 1995
  • The recent rapid growth of air conditioning load has become a major reason of peak load increase in summer. In connection with this, we surveyed the load management projects of utilities world-wide and their detailed activities. This study is to develop a remote load control system using computer and radio communications. We finished the field-test of this system on August 1995 in Seoul area. During the field-test, the remote load control of air conditioners was proved to be well-timed. Two control modes, group control and all control, are available for the user to select. The transmission reliability of the load control signal was very good and the functions of system hardware as well as the software were excellent. So we confirmed the applicability of the load control system including the paper communication network. In this paper, detailed information on the system functions and experimental results are described.

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A Study on Multi Level Load Shedding Control Scheme Strategy for Stabilization of the Korean Power System (국내 전력계통 안정화를 위한 다단계 부하차단 제어전략 수립에 관한 연구)

  • Lee, Yun-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.65 no.4
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    • pp.255-261
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    • 2016
  • Korean Power System are operating a load shedding system to prevent voltage instability phenomenon caused by severe line contingencies. In order to apply the load shedding scheme should be selected a location, amount, delay time. Current load shedding system is load shedding amount that has been calculated in the steady-state analysis to load shed the total amount in first level, load shedding amount calculated in advance, it is possible to perform an unnecessary load shedding. In this paper, set a multi-level load shedding control strategy step-by-step selection of load shedding amount for the prevention of excessive load shedding. In addition, through a voltage resilience analysis of the power system by applying motor load ratio and sensitivity parameter to selection the multi level load shedding ratio and delay time. For this reason, to take advantage of the limit data of interchange power, by utilizing interface power flow data to set a multi-level load shedding control strategy for the stabilization of the Korean Power System.

Estimation of Vehicle Driving-Load with Application to Vehicle Intelligent Cruise Control

  • Kyongsu Yi;Lee, Sejin;Lee, Kyo-Il
    • Journal of Mechanical Science and Technology
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    • v.15 no.6
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    • pp.720-726
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    • 2001
  • This paper describes a vehicle driving-load estimation method for application to vehicle Intelligent Cruise Control (ICC). Vehicle driving-load consists of aerodynamic force, rolling resistance, and gravitational force due to road slope and is unknown disturbance in a vehicle dynamic model. The vehicle driving-load has been estimated from engine and wheel speed measurements using a vehicle dynamic model a least square method. The estimated driving-load has been used in the adaptation of throttle/brake control law. The performance of the control law has been investigated via both simulation and vehicle tests. The simulation and test results show that the proposed control law can provide satisfactory vehicle-to-vehicle distance control performance for various driving situations.

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Path Control with Energy-Saving Load-Sensing for a Cylinder-Load System Using Speed-Controlled Fixed Displacement Pump (속도제어-정용량 펌프를 사용하는 실린더-부하계의 에너지절약-부하감지형 경로제어)

  • Cho, S.H.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.6 no.3
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    • pp.16-22
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    • 2009
  • This paper deals with the issue of robust position tracking control and energy-saving control for a valve-controlled cylinder system using speed-controlled fixed displacement pump. The whole feedback control system is composed of a pair of interconnected subsystems, that is, valve-controlled cylinder system and load-sensing control system. From experiments it is shown that position tracking control in the load sensing control system can accomplish significant reduction in input energy to pump comparing to a conventional valve-controlled cylinder system, while exhibiting the same position tracking control accuracy.

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Development of Industrial Load Control Algorithm for Factory Energy Management System (F-EMS) under Real Time Pricing Environment (실시간요금제하에서 산업용 수용가의 부하제어알고리즘 개발)

  • Jeon, Jeong-Pyo;Jang, Sung-Il;Kim, Kwang-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.12
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    • pp.1627-1636
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    • 2014
  • In real-time electricity price environment, the energy management system can provide the significant advantage to the residential, commercial and industrial customers since it can reduce the electricity charge by controlling the load operation effectively in response to time-varying price. However, the earlier studies for load management mainly focus on the residential and commercial customers except for the industrial customers because most of load operations in industrial sector are intimately related with production schedule. So, it is possible that the inappropriate control of loads in industrial sector causes huge economic loss. In this paper, therefore, we propose load control algorithm for factory energy management system(F-EMS) to achieve not only minimizing the electricity charges but also maintaining production efficiency by considering characteristics of load operation and production schedule. Considering characteristics of load operation and production schedule, the proposed load control algorithm can reflect the various characteristics of specific industrial customer and control their loads within the range that the production efficiency is maintained. Simulation results show that the proposed load control algorithm for F-EMS leads to significant reduction in the electricity charges and peak power in industrial sector.

A Study of Design Single Phase Boost Converter Controller for Compensated Load Current and Duty (부하전류와 듀티를 보상하는 단상 PFC 부스트 컨버터 제어기 설계)

  • Lim, Jae-Uk;Lee, Seung-Tae;Baek, Seung-Woo;Kim, Hag-Wone;Cho, Kwan-Yuhl;Choi, Jaeho
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.6
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    • pp.527-534
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    • 2017
  • This paper proposes a new DC link voltage controller for a single-phase power factor correction (PFC) boost converter. The load current of the PFC boost converter affects the capacitor current, whereas the load current changes the output voltage. However, previous works that compensate output current have failed to consider the relationship between load current and duty. Thus, they also fail to maintain a constant output voltage if the load fluctuates under the conditions of a non-rated input voltage. By considering the duty in the load current compensation, the proposed method improves the load transient response regardless of the input voltage. To demonstrate its effectiveness, the proposed method is compared with other control methods by conducting PSM simulations and experiments under a rapidly changing load.

Comparative Part Load Performance Analysis of Gas Turbine Power Generation Systems Considering Exhaust Heat Utilization (배열 이용도를 고려한 가스터빈 발전시스템의 부분부하 성능 비교분석)

  • Kim, T. S.
    • 유체기계공업학회:학술대회논문집
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    • 2002.12a
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    • pp.290-297
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    • 2002
  • This paper presents analysis results for the effect of power control strategies on the part load performance of gas turbine based power generation systems utilizing exhaust heat of the gas turbine such as cumbined cycle power plants and regenerative gas turbines. For the combined cycle, part load efficiency variations were compared among different single shaft gas turbines representing various technology levels. Power control strategies considered were fuel only control and IGV control. It has been observed that gas turbines with higher design performances exhibit superior part load performances. Improvement of part load efficiency by adopting air flow modulation was analyzed and it is concluded that since the average combined cycle performance is affected by the range of IGV control as well as its temperature control principle, a control strategy appropriate for the load characteristics of the individual plant should be adopted. For the regenerative gas turbine, it is likewise concluded that maintaining exhaust temperature as high as possible by air flow rate modulation is required to increase part load efficiency.

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