• Proceedings of the KIPE Conference
• /
• 2016.07a
• /
• pp.121-122
• /
• 2016

본 논문에서는 중 고속 자기부상열차용 선형 유도전동기에서 나타나는 단부효과를 고려하여 중 고속 운전을 할 수 있는 제어 알고리즘을 제안한다. 선형 유도전동기에서 나타나는 단부효과를 수식적으로 분석하여 선형 유도전동기 시뮬레이션 모델을 구성하였으며, 단부효과의 영향을 보상하여 제어를 함으로서 선형 유도전동기 적합한 제어 알고리즘을 구성하여 시뮬레이션을 통하여 검증하였다.

• Proceedings of the KIPE Conference
• /
• 2017.11a
• /
• pp.65-66
• /
• 2017

본 논문은 자기부상열차 시스템의 부상 신뢰도 향상을 위한 선형 유도전동기의 순시 제어기법을 제안한다. 선형 유도전동기는 자기부상열차의 추진을 담당하며, 운전 속도와 입력 주파수에 따른 슬립 특성이 존재한다. 이 슬립 특성은 전동기에서 발생되는 수직력과 밀접한 관련을 보이며, 이는 부상 시스템에 외란으로 작용된다. 따라서 본 논문에서는 선형 유도전동기의 특성을 FEM 해석을 통해 정확히 분석하고, 이를 반영한 최적 슬립 주파수 간접벡터제어 기법을 통해 부상 신뢰도 향상을 위한 새로운 순시 제어기법을 제안 하였다.

• Proceedings of the KIPE Conference
• /
• 2008.06a
• /
• pp.256-258
• /
• 2008

현재 멀티레벨 인버터는 고압 대용량 시스템에 많이 사용되고 있으며, 연구 또한 지속되고 있다. 현재 일반적으로 사용되는 멀티레벨 방법으로는 Neutral Point Clamp(NPC), H-Bridge 케스캐이드, 플라잉 커패시터가 멀티레벨이 있다. 본 논문에서는 Neutral Point Clamp 토포로지 중 다이오드 클램프 멀티레벨을 이용하여 3상 유도전동기용 하이브리드 다이오드 클램프 멀티레벨 인버터를 구성 하였다. 그리고 신호 발생 방법으로는 Subhamonic PWM 방식을 사용하였으며, 유도 전동기 제어는 간접벡터제어로 제어를 함으로써 유도 전동기 구동용 하이브리드 다이오드 클램프 멀티레벨 인버터의 적합함을 검증 하였다.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.9 no.4
• /
• pp.397-404
• /
• 2004

This paper proposes a variable speed control scheme of grid-connected wind power generation systems using cage-type induction generators. The induction generator is operated in indirect vector control mode, where the d-axis current controls the excitation level and the q-axis current controls the generator torque, by which the speed of the induction generator is controlled according to the variation of the wind speed In order to produce the maximum output power. The generated power flows into the utility grid through the back-to-back PWM converter. The line-side converter controls the dc link voltage by the q-axis current control and can control the line-side power factor by the d-axis current control. Experimental results are shown to verify the validity of the proposed scheme.

• 제어로봇시스템학회:학술대회논문집
• /
• 1996.10b
• /
• pp.1056-1059
• /
• 1996

In this paper, we analyzed the effect of the change of the rotor time constant on the performance of the indirect vector control system. By employing indirect field orientation technique, we have also suggested an optimal control algorithm that allows an induction motor to maintain the maximum torque under the changing environment of rotor time constant. A computer simulation on the transient response of the output torque was demonstrated. To verify the validity of the method that has been proposed in this paper, an experiment has been performed utilizing TMS32OC31(40MHz) DSP chip which is capable of performing floating-point arithmetic in real time.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.6 no.2
• /
• pp.115-124
• /
• 2001

In this paper, authors propose a new nonlinear rotor flux observer for rotor field oriented control of an induction motor which is designed based on the extended Luenberger Observer theory. Extended Luenberger Observer requires minimal solution of nonlinear partial differential equation on its coordinate transformation and linearization needed on a nonlinear observer design in general. The proposed rotor flux observer is derived from the 2 phase model of induction motor on the orthogonal coordination and it has the reduce gain matrix. Simulation and experimentation were performed under the conventional indirect vector control and direct vector control with the proposed observer at different rotor resistance. Simulation results show that the convergence of the proposed observer is influenced by the chosen eigenvalues. Experimentation results on load operation show the direct vector control with the proposed observer is better than the indirect vector control to maintain the characteristics of the vector control.

• Proceedings of the KIEE Conference
• /
• 2002.07b
• /
• pp.1155-1157
• /
• 2002

This paper presents the use of a simple genetic algorithm for the tuning of a proportional-integral speed controller for an induction motor drive. The influence of population size, generation number and rate of mutation on the convergence of the genetic algorithm is investigated. On Matlab/Simulink environment, this paper proposes an optimal GA-PI controller of indirect vector control for induction motor drive system. The simulation results verify that the system has a more robust to the parameter variation than classical PI controller.

• Proceedings of the KIEE Conference
• /
• 1996.07a
• /
• pp.458-460
• /
• 1996

In this study, the full-state flux observer is designed in the synchronous DQ-frame and the speed adaptation rule is derived by using the MRAS(Model Reference Adaptive System) theory. In this rule, the induction motor becomes a reference model and the flux observer is taken as a adjustable model. A guideline of the adaptation gain is investigated for the precise and stable speed adaptation and the proposed scheme is compared with the conventional one designed in the stationary DQ-frame.

• Proceedings of the KIPE Conference
• /
• 2004.07a
• /
• pp.303-307
• /
• 2004

This paper presents a new speed control scheme of the spindle induction motor (IM) using fuzzy-logic control in field weakening region. The implementation of the proposed FLC-based spindle IM are investigated and compared to those obtained from the conventional PI controller based drive system, we have confirmed good simulation and experimental results at different dynamic operating conditions such as sudden change in command speed, step change, etc.

• Proceedings of the KIEE Conference
• /
• 1999.07f
• /
• pp.2770-2772
• /
• 1999

This paper discusses the basic principle of vector control applied to induction motors. A indirect strategy for impressed stator currents control is used for system modeling. IRFOC for induction motor was modelled using "Matlab with Simulink" IRFOC be applied to 15kW induction motor is simulated in different conditions; step changes in torque at a fixed reference speed, and cyclic change of speed reference. Simulation result considering the variation of stator, rotor resistance includes the response of speed, torque and rotor d-q fluxes.