• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제49권8호
• /
• pp.529-535
• /
• 2000

In this paper, a current control system of a single phase PWM AC/DC converter using a reduced-order Luenberger observer without source voltage sensors is proposed. The sinusoidal input current and unity input power factor are realised based on the estimated source voltage performed by the reduced-order Luenberger observer using actual currents and DC link voltage. The poles of the reduced-order Luenberger observer are placed in the left half plane of s-plane by the pole-placement method in order to acquire the stability of the observer. The magnitude and the phase of the estimated source voltage are used to accomplish the unity power factor. The proposed method is implemented by DSP(Digital Signal Processor). Experimental Results verify that the reduced-order observer estimates the source voltage without the estimation error and the control system accomplishes the unity power factor, and constant DC link voltage.

• 제어로봇시스템학회논문지
• /
• 제18권7호
• /
• pp.688-698
• /
• 2012

This paper deals with ROLSO (Reduced Order Luenberger State Observer) design to prevent jackknifing phenomenon of articulated vehicles consisting of the tractor and semi-trailer by using GPS. In addition, by applying the regulator system using ROLSO feedback system, simulation's result presents that articulated vehicle's states are stabilized than the human's PR time (Preception Response time) rapidly. This simulation verifies that the automatic control of articulated vehicle's can be applied for the accident prevention for the time that the driver is unable to manage with the sudden accident. For this simulation, by using the equation of planar motion, the modeling of the articulated vehicle was performed. This modeling was expressed in the state space model. And FOLSO (Full Order Luenberger State Observer), ROLSO were designed by using the state space model of an articulated vehicle's dynamics.

• 대한임베디드공학회논문지
• /
• 제12권5호
• /
• pp.311-318
• /
• 2017

A reduced order observer is developed for depth control of a hybrid underwater glider which combines the good aspects of a conventional autonomous underwater vehicle and a underwater glider. State variables include the center of gravity of the robot and the weight of the buoyancy bag, which can not be directly measured. By using the mathematical model and available information such as directional velocities, accelerations, and attitudes, we developed a Luenberger's reduced order observer to estimate the center of gravity and the buoyancy weight. By simulations using Matlab/Simulink, the efficiency of the proposed observer is shown, where a LQR controller using full state variables is adopted as a depth controller.

• 한국항공운항학회지
• /
• 제20권2호
• /
• pp.18-25
• /
• 2012

The availability of the GPS signal has been expanded greatly in the field of society overall through the development and construction of the GNSS(Global Navigation Satellite System). Furthermore, in the military, aviation and field of space, the GPS signal is applied widely through the combination of INS consisting of gyroscope and accelerometer, IMU, AHRS with the addition of magnetic sensor. Particularly, the performance of these equipments or sensors is very important with GPS and PAR(Precision Approach Radar) in the flight control of the aircraft. This paper deals with MATLAB simulation and ROLSO(Reduced Order Luenberger State Observer) design to reduce the load of system and realize the stable lateral direction approach control in an appropriate time for reduction of the horizontal error which is importantly considered while an aircraft lands instead of the FOLSO(Full Order Luenberger State Observer) using all measurement values. Consequently, ROLSO is expected to be used for the aircraft's attitude control in the aircraft landing causing the burden to the pilots.

• 한국전자통신학회논문지
• /
• 제13권1호
• /
• pp.101-106
• /
• 2018

본 연구는 산업현장에서 많이 사용되는 솔레노이드의 사용함에 있어서, 정밀한 위치 제어를 위한 제어기 설계의 방법을 제안한다. 먼저 관측기는 외란을 적극 반영하여 상태추정을 할 수 있는 루엔버거 관측기를 설계하고 적절한 이득을 설정한다. 관측된 상태를 바탕으로 분수차수 PD제어기를 설계하여, 위치제어에 적용한 결과 분수차수제어기는 목표량이 다르더라도 거의 동일한 제어성능을 얻을 수 있었다. 또한, 정상상태의 위치 오차가 0.1[%]이내이고, 기동시간이 약 0.05초 이내의 정밀한 위치제어성능 가짐을 확인할 수 있었다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
• /
• pp.726-728
• /
• 2004

In this paper, the gain of the observer is properly set up using the fuzzy control and Fuzzy-Sliding observer(FSQ) that have a superior transient characteristic and is easy to implement compared to the existing method is designed. It estimate the differentiation of the armature current directly using the armature current measured in the AC motor. It estimate the speed of the rotor using the differentiation. It is proposed speed sensorless control method using the estimated speed. Optimal gain of speed observer(Luenberger observer) was set up using the fuzzy control and adapted speed control of AC servo motor. To verify the performance of designed Fuzzy-Sliding observer, simulation compared with fixed speed observer gain of G.B Wang and S.S Peng's sliding observer is performed. Also, it was proved the excellence and feasibility of the proposed observer from the comparison test with a speed sensor and without a speed sensor which used a highly efficient drive and 400W AC servo motor starting system.

• 한국전자통신학회논문지
• /
• 제11권10호
• /
• pp.955-962
• /
• 2016

본 논문은 BLDC 전동기의 정밀한 속도제어를 위하여 외란 관측기의 설계 및 영향을 제거하는 제어기 설계방법을 제안한다. BLDC 전동기의 외부에서 회전축에 작용하는 부하의 변동과 전기적인 시스템에서 발생하는 역기전력을 외란으로 가정하고, 외란은 구간에 대한 상수로 가정하여 루엔버거 관측기를 설계한다. 시스템 상태에 대한 관측기의 오차가 0으로 수렴할 수 있도록 적절한 이득을 설정하는 방법을 보이고, 추종성능을 향상시킬 수 있는 적절한 PI제어기의 이득을 설정하기 위한 방법을 제시한다. 제안된 제어기를 120W급의 BLDC 전동기에 적용하여 속도 그리고 전류 레퍼런스를 추종하는 능력을 시뮬레이션 시험하였다. 상수부하의 변동을 외란으로 적용하였고, 그 결과 설계된 제어기의 정상상태 오차가 0.1 [%] 이내를 가짐으로 상태 추종성능에 대해 유용한 제어기임을 보일 수 있었다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제51권9호
• /
• pp.515-521
• /
• 2002

This paper presents the scheme that improves control responsibility and stability of the controlled-PM electromagnet levitation system with zero Power controller. A magnetically levitation system is used widely because friction can almost be disappeared. But it is difficult to control due to restraint of controllable area and nonlinear characteristics of electromagnetic force, which is proportioned to a square of the magnetic flux density and is in inverse proportion to a square of the air-gap. So, the application of observer theory in which the levitation system is considered to be a linear dynamic model has resulted in omitting the time dependence on mover's speed. Consequently, the performance of the observer is quite poor during transients. Therefore, this paper proposed the controlled-PM electro-magnetic levitation control method in which the variable load is estimated by using the reduced order extended luenverger observer and its system is controlled at a new zero power equilibrium air-gap position. It is also verified that the proposed control method improve the control performance through simulation and experiment.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2004년도 전력전자학술대회 논문집(1)
• /
• pp.269-273
• /
• 2004

It is important to estimate the rotor speed for field weakening operation in the speed sensorless stator flux oriented (SFO) induction motor drive. Several methods have been reported to estimate exactly the speed in the speed sensorless system. In this paper, we apply two observer-based methods, the Luenberger observer (LO) and the Kalman filter (KF), to SFO induction motor drive in order to achieve a speed sensorless operation in field weakening region. Two control methods are reviewed and discussed. The operation characteristics of these methods in the field weakening region is compared by simulation and experiment.

• 전자공학회논문지SC
• /
• 제40권3호
• /
• pp.117-126
• /
• 2003

본 연구에서는 월쉬함수를 이용하여 샘플링 구간내에서 데이터를 처리할 수 있는 온라인 월쉬변환과 샘플링 구간내에서 미분 방정식을 계산할 수 있는 새로운 온라인 월쉬함수 미분연산법을 제안하였다. 스케일링 인자의 도입과 다음구간에서의 초기조건을 계산하여 줌으로써 임의의 샘플링 시간을 취할 수 있게 하였으며 제안된 월쉬함수 온라인 알고리즘을 이용하여 기존의 직교함수가 가지는 최종시간까지의 신호를 모두 알고 있어야 그 적용이 가능하다는 단점을 제거하였다. 유사변환법을 이용하여 유도된 동적 시스템에 대한 Luenberger관측기를 월쉬함수를 이용하여 새롭게 변환함으로써 관측기에 포함된 출력의 미분항을 없애기 위한 불필요한 관측기 방정식의 분할을 피하였으며 대수적으로 상태 및 미지입력을 추정하였다. 제안된 방법을 이용하면 실시간 처리를 요하는 시스템에 유용하게 적용될 것으로 기대된다.