• Title/Summary/Keyword: Bumpless transfer

Search Result 12, Processing Time 0.024 seconds

A New Unified Method for Anti-windup and Bumpless Transfer (누적방지 무충돌전환을 위한 새로운 통합형 기법)

  • Kim, Tae-Shin;Kwon, Oh-Kyu
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.15 no.7
    • /
    • pp.655-660
    • /
    • 2009
  • In many real applications, the discrepancy problem between controller outputs and plant inputs or the abrupt variation problem of controller outputs can occur. These problems have a negative effect on control performance and stability. It is well-known that two phenomena called 'windup' and 'bump' cause these problems. So far these problems have been studied separately in each side of the anti-windup and the bumpless transfer. This paper proposes a new unified method combines the anti-windup and the bumpless transfer method using the linear quadratic minimization and a proper state space model representation for the anti-windup controller. The proposed method has a feature that it takes account of both the anti-windup and the bumpless transfer in one formula. Finally, we exemplify the performance of the proposed method via numerical examples using the controller switching between the anti-windup PID controller and the anti-windup LQ controller.

An Improved Bumpless Transfer by Solving the Input Discrepancy Problem (입력 불일치 해소에 의한 개선형 무충돌전환)

  • Kim, Tae-Shin;Yang, Ji-Hyuk;Kwon, Tae-Wan;Kwon, Oh-Kyu
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.15 no.10
    • /
    • pp.982-987
    • /
    • 2009
  • On the controller switching time, even though on-line/off-line controller outputs are the same, a problem which deteriorates the performance of bumpless transfer can happen in case that any discrepancy between the two controller inputs is transferred directly to the controller output. In this paper, we analyze the cause of that phenomenon in existing research results and propose a new method which improves that problem. In order to solve this problem, the off-line controller is augmented to an anti-windup structure and an improved bumpless transfer method is derived by using the changed input of the off-line controller instead of the plant input. We exemplify the performance of the proposed method by comparing with the performance of the existing method via numerical examples.

Design of the Anti-windup and Bumpless Transfer Controller with Application to Nonlinear Boiler Systems (누적방지 무충돌 전환 제어기의 설계와 비선형 보일러 시스템 적용)

  • Lee, Young-Sam;Lee, Myung-Eui;Kwon, Oh-Kyu
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.6 no.4
    • /
    • pp.247-253
    • /
    • 2000
  • In this paper, we deal with the full range control problem of nonlinear boiler systems subject to complex actuator constraints. Firstly, $H\infty$ loop shaping design procedure[10] is used for the controller design. Secondly, modified high-gain feedback[11] for the loop shaping controller is adopted for the anti-windup function and the bumpless transfer technique between controllers is proposed for the full range control of nonlinear systems. Finally, the performance of the proposed controller is demonstrated through the simulation studies.

  • PDF

Full-Envelope Controller Switching Scheme Using Bumpless Transfer Implementation Algorithm (무충돌 전환 구현 알고리즘을 사용한 전비행영역 제어기 교체법)

  • Kim, Tae-Shin;Kwon, Oh-Kyu
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.36 no.6
    • /
    • pp.574-580
    • /
    • 2008
  • This paper has proposed a controller switching scheme for full-envelope aircraft control using the bumpless transfer implementation algorithm developed recently. This switching scheme has combined by proper rules the common existing method which switches the controller according to attitude and mach number of the aircraft with an optimization method which uses the cost function relating to bump phenomenon by means of controller switching criterion. This paper exemplifies the control performance improvement via simulations applied to a high performance aircraft benchmark problem in a wide operating range to test the proposed controller switching scheme.

A Study on the Fault-Tolerant and Bumpless Switching Control for Boiler Systems in the Power Plant (발전용 보일러 시스템의 이상허용 및 과도상태의 유연한 제어에 관한 연구)

  • Kwon, Oh-Kyu;Lee, Young-Sam
    • Proceedings of the KIEE Conference
    • /
    • 1998.11c
    • /
    • pp.1037-1040
    • /
    • 1998
  • In this research a fault-tolerant and bumpless switching control is proposed for boiler systems used in the power plants. Firstly, three operating points are selected to control the nonlinear boiler through the full operational range, and the $H_{\infty}$ loop shaping controller and the model-based predictive controller(MBPC) are designed. To prevent the windup and bump problems which are caused by the actuator saturation and the controller switching, an anti-windup and bumpless transfer technique is adopted to the $H_{\infty}$ loop shaping controller. Also the constrained gain-scheduling technique is applied to MBPC to achieve the same objective. Secondly, the fault-tolerant control technique is proposed to continue the control action without stopping the boiler operation even in case of some faults. Through various simulation studies, the performances of the proposed control techniques are demonstrated.

  • PDF

A Study en the Fault-Tolerant and Bumpless Switching Control for Boiler Systems in the Power Plant (발전용 보일러 시스템의 이상허용 및 과도상태의 유연한 제어에 관한 연구)

  • Kwon, Oh-Kyu;Lee, Young-Sam
    • Proceedings of the KIEE Conference
    • /
    • 1998.11a
    • /
    • pp.369-372
    • /
    • 1998
  • In this research a fault-tolerant and bumpless switching control is proposed for boiler systems used in the power plants. Firstly, three operating points are selected to control the nonlinear boiler through the full operational range, and the $H_{\infty}$ loop shaping controller and the model-based predictive controller(MBPC) are designed. To prevent the windup and bump problems which are caused by the actuator saturation and the controller switching, an anti-windup and bumpless transfer technique is adopted to the $H_{\infty}$ loop shaping controller. Also the constrained gain-scheduling technique is applied to MBPC to achieve the same objective. Secondly, the fault-tolerant control technique is proposed to continue the control action without stopping the boiler operation even in case of some faults. Through various simulation studies, the performances of the proposed control techniques are demonstrated.

  • PDF

Bumpless Transfer Implementation Algorithm for LQ Flight Control (LQ비행제어를 위한 무충돌 전환 구현 알고리즘)

  • Kim, Tae-Sin;Park, Jong-Hu;Gwon, O-Gyu
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.34 no.11
    • /
    • pp.35-41
    • /
    • 2006
  • This paper proposes an algorithm for switching LQ(Linear Quadratic) controllers designed at each flight envelope without a bump phenomenon. This algorithm is derived to apply to LQ controller more easily than existing implementation algorithm and is proposed to consider trim points of nonlinear models, which is adequate to real applications. This paper exemplifies the control performance improvement via simulations applied to LQ control of a supersonic test aircraft as a benchmark problem to test the proposed algorithm performance.

A Study on the Fault-Tolerant and Bumpless Switching Control for Boiler Systems in the Power Plant (발전용 보일러 시스템의 이상허용 및 과도상태의 유연한 제어에 관한 연구)

  • Kwon, Oh-Kyu;Lee, Young-Sam
    • Proceedings of the KIEE Conference
    • /
    • 1998.11b
    • /
    • pp.689-692
    • /
    • 1998
  • In this research a fault-tolerant and bumpless switching control is proposed for boiler systems used in the power plants. Firstly, three operating points are selected to control the nonlinear boiler through the full operational range, and the $H_{\infty}$ loop shaping controller and the model-based predictive controller(MBPC) are designed. To prevent the windup and bump problems which are caused by the actuator saturation and the controller switching, an anti-windup and bump less transfer technique is adopted to the $H_{\infty}$ loop shaping controller. Also the constrained gain-scheduling technique is applied to MBPC to achieve the same objective. Secondly, the fault-tolerant control technique is proposed to continue the control action without stopping the boiler operation even in case of some faults. Through various simulation studies, the performances of the proposed control techniques are demonstrated.

  • PDF

Development of Automatic Transferring Motor Driver for a Two-Motors-Driven Electrical Scooter (전후륜 자동절환기능을 갖는 2륜 전기오토바이용 모터 드라이버 개발)

  • Chung, Dae-Won
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.59 no.4
    • /
    • pp.733-739
    • /
    • 2010
  • We developed to have an automatic transferring function of a two-motors-driven electrical scooter for women or seniors to use conveniently it since it has been previously to operate it in manual only. The function would be implemented by using master and slave micro-control units(MCU) in the system with the given input and output signals. The simulation and test of the system results show that the transition conditions of either higher accelerating speed and/or higher torque are demonstrated at the worst conditions, which means that the transition points might be set either at the 70% of accelerating speed or from the 100% of load torque. The developed equipment is very useful and has good performance in the real test and would be used for top brand and might be applicable to any other types of green cars.

Design of a Mode Switching Controller for Gun Servo System (포 구동시스템에 대한 모드 스위칭 제어기 설계)

  • Yim Jong-Bin;Baek Seoung-Mun;Lyou Joon
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.12 no.5
    • /
    • pp.425-430
    • /
    • 2006
  • To meet an increasing demand for high performance in gun dynamic plant, both a precise and a fast response positioning are strongly required for the gun servo system. A mode switching control(MSC) scheme, which includes a fine stabilizing controller, fast positioning one and a switching function, is widely used to meet this requirement. Stabilization is performed through PID controller, while a time optimal control method is used for target designation. In this paper, a modified PTOS(Proximate Time Optimal Servomechanism) algorithm is derived so as to accommodate the damping term in the gun plant model. Also, applying a mode switching strategy, the bumpless transfer is made possible when the controller switches from PTOS to PID. To show the effectiveness of the overall control system, simulation results are given including the gun dynamics.