• Journal of Power Electronics
• /
• 제3권2호
• /
• pp.115-123
• /
• 2003

This paper presents analysis, design and simulation for the indirect field orientation control (IFOC) of induction machine drive system. The dynamic performance of the IFOC under nominal and detuned parameters of the induction machine is established. A conventional proportional plus integral-derivative (PI-D) two-degree-of-freedom controller (2DOFC) is designed and analysed for an ideal IFOC induction machine drive at nominal parameters with the desired dynamic response. Varying the induction machine parameters causes a degredation in the dynamic response for disturbance rejection and tracking performance with PI-D 2DOF speed controller. Therefore, conventional controllers can nut meet a wide range of speed tracking performance under parameter variations. To achieve high- dynamic performance, a proposed robust fuzzy logic controllers (RFLC) for d-axis rotor flux, d-q axis stator currents and rotor speed have been designed and analysed. These controllers provide robust tracking and disturbance rejection performance when detuning occurres and improve the dynamic behavior. The proposed REL controllers provide a fast and accurate dynamic response in tracking and disturbance rejection characteristics under parameter variations. Computer simulation results demonstrate the effectiveness of the proposed REL controllers and a robust performance is obtained fur IFOC induction machine drive system.

• 전기전자학회논문지
• /
• 제24권3호
• /
• pp.877-882
• /
• 2020

본 논문에서는 계통연계형 인버터(Grid-connected inverter, GCI) 시스템을 위한 전류 제어 방법들의 성능 비교 연구를 제시한다. GCI 시스템을 위해 다양한 전류 제어 방법이 개발되었으며 각 제어기마다 장점과 한계를 가지고 있다. 본 논문에서는 GCI 전류 제어기들의 정상 상태 및 과도 상태에서의 동적 성능을 비교 분석한다. 제안한 전향보상기법(Command feedforward control, CFFC) 및 외란제거제어(Disturbance rejection control, DRC)가 모든 GCI 전류 제어기에 적용 전과 후의 성능을 비교 분석하였다. 제안된 CFFC와 DRC 제어 알고리즘을 주파수 영역에서 분석하고 성능 검증을 위해 각 GCI 전류 제어 방법들의 시뮬레이션 및 실험 모델을 개발하였다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2004년도 ICCAS
• /
• pp.885-890
• /
• 2004

Strictly maintaining the steam temperature can be difficult due to heating value variation to the fuel source, time delay changes in the main steam temperature, the change of the dynamic characteristics in the reheater. Up to the present time, PID Controller has been used to operate this system. However, it is very difficult to achieve an optimal PID gain with no experience, since the gain of the PID controller has to be manually tuned by trial and error. This paper focuses on tuning of the Controller with disturbance rejection for thermal power plant using immune based multiobjective approach. An ITSE(Integral of time weighted squared error) is used to decide performance of tuning results.

• 한국지능시스템학회:학술대회논문집
• /
• 한국퍼지및지능시스템학회 2003년도 ISIS 2003
• /
• pp.443-446
• /
• 2003

Conventional disturbance rejection methods have to derive the inverse model of a system. However, the inverse model of n nonholonomic system is not unique, because an inverse it changes depending on initial conditions and desired values. A kind of internal model control (IMC) using feedback error learning is discussed for the motion control of nonholonomic mobile robots in this paper, The present method is different from a conventional IMC whose control system consists of an inverse model, a direct model and a filter. The present disturbance rejection method need not use a direct model, where the remaining two elements are composed of the same inverse model based on neural networks.

• 전기학회논문지
• /
• 제62권9호
• /
• pp.1234-1239
• /
• 2013

This paper provides a technical review of speed control using variable gain PI algorithm for BLDC(Brushless DC) motor. Usually the PI control is used in many motor applications, but a general PI control has problems of overshooting and disturbance for response. By the change of PI gain in motor control operation, these problems can be solved. To find the optimized PI gains for BLDC motor control, many control methods have been proposed. In this paper, the control algorithm with a variable PI gain is applied to improve overshooting response in transient region and rapid load disturbance rejection. Fixed gain and variable gain PI controls are compared. The validity of the propose method is verified by experiment.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 1995년도 추계학술대회 논문집
• /
• pp.470-473
• /
• 1995

There exist two critical in application of the magnetic bearing system. One is the control axis interference caused by gyroscopic effect and the other is the vibration caused by the unbalance on the rotor. To solve both problems at the same time, first, a centralized full-state feedback controller based on the LQR control theory was designed to compensate for the gyroscopic effect. Second, disturbance rejection control input based on the observer was designed to avoid the vibration causer by the unbalanced rotor. Balancing input computer accroding to LQR and output of the observer were derived in term of rotational speed. Effectiveness of the on-line balancing was verified through numerical simulation. The developed observer-based controller was also applied to the linear and nonlinear magnetic bearing systems.

• 산업기술연구
• /
• 제22권B호
• /
• pp.185-190
• /
• 2002

This paper describes a design of an induction motor control system using a 2 degree-of-freedom PI controller to compensate the effects of disturbance without degrading tracking performance. On the basis of vector control principle, the control system is simulated by using the ACSL and implemented on a DSP system(TMS320C31). In designing the 2 DOF controller, we can tune the performance of either the tracking or disturbance rejection independently without affecting the other. With the experimental results, the 2 DOF controller has shown a better performance in command tracking and disturbance rejection than a conventional PI controller.

• 제어로봇시스템학회논문지
• /
• 제3권1호
• /
• pp.9-16
• /
• 1997

The method of designing robust two degree of freedom(2 DOF) controllers for linear systems with parameter uncertainties and unmodeled dynamics is presented in this paper. Robust performance condition that accounts for robust model matching of closed loop system and disturbance rejection is derived. Using the robust performance condition, the feedback controller is designed to meet robust stability and disturbance rejection specifications, while prefilter is used to improve the robust model matching properties. The $H^{\infty}$ and $\mu$ controller for six degree of freedom vehicle with parameter variations are designed and compared. Simulations for hydrodynamic parameter variations and disturbance are presented to demonstrate the achievement of good robust performance.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2002년도 하계학술대회 논문집 D
• /
• pp.2079-2081
• /
• 2002

R/C helicopter has been used to several fields of military affairs, investigation searching and toys because it has small size hovering and vortical take-off characteristics etc. Therefore it needs more realizable control method. The paper introduces simulation and experimental results for control of a helicopter training simulator by self tuning control method. To realize the disturbance rejection and the given reference tracking, a least common multiple polynomial between the reference and disturbance model polynomials is operated to the plant model. The effectiveness of the method is shown by simulation and experimental results for a helicopter training simulator with two degree of freedom.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2019년도 추계학술대회
• /
• pp.7-9
• /
• 2019

이 논문은 이관성 시스템에서 능동 외란 제거 제어(Active Disturbance Rejection Control, ADRC) 기반의 진동 저감 알고리즘을 제안한다. 제안한 방법은 축소 차원 ADRC를 기반으로 구성하였다. ADRC 이론에 기반한 제어 이론은 전체 토크 중 전동기 측의 관성 모멘트에 대한 토크를 제외한 모든 토크를 외란 성분이라 설정한다. 외란에 대한 가속도 성분을 전체 외란(Total Disturbance)이라고 설정하고, 이를 추정하여 보상한다. 축소 차원 ADRC의 차수가 낮아서, 축소 차원 ADRC의 대역폭을 기존 ADRC의 대역폭보다 크게 설정할 수 있다. 그리고, 증가한 이득과 실질적인 구현을 고려하여, 이산 시간 영역에서 설계하였다. 제안된 알고리즘의 안정도를 확보하고, 성능을 높이기 위하여, 추정하는 제정수의 값을 실제 값보다 작게 설정하였다. 제안한 방법은 기계시스템의 공진에 의한 영향을 감쇄시킬 수 있다. 제안한 방법을 검증하기 위해, 시뮬레이션과 실험을 수행하였다.