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Kyo-Beum Lee,Frede Blaabjerg 대한전기학회 2006 International Journal of Control, Automation, and Vol.4 No.1
In this paper, an improved direct torque control CDTC) method for sensorless matrix converter drives is proposed which enables to minimize torque ripple, to obtain unity input power factor, and to achieve good sensorless speed-control performance in the low speed operation, while maintaining constant switching frequency and fast torque dynamics. It is possible to combine the advantages of matrix converters with the advantages of the DTC strategy using space vector modulation and a flux deadbeat controller. To overcome the phase current distortion by the non-linearity of a matrix converter drive, the simple non-linearity compensation method using PQR power theory are presented in the proposed scheme. Experimental results are shown to illustrate the feasibility of the proposed strategy.
Kyo-Beum Lee,Blaabjerg, F. Institute of Electrical and Electronics Engineers 2007 IEEE transactions on industrial electronics Vol.54 No.6
<P>In this paper, an improved direct torque control (DTC) method for sensorless matrix converter drives is proposed, which is characterized by minimal torque ripple, unity input power factor, and good sensorless speed-control performance in the low-speed operation, while maintaining constant switching frequency and fast torque dynamics. It is possible to combine the advantages of matrix converters with the advantages of the DTC strategy using space-vector modulation and two PI controllers. To overcome the degrading of dynamic torque response compared with the basic DTC method and the phase-current distortion due to the nonlinearity of the matrix converter, an overmodulation strategy and a simple nonlinearity-compensation method using transformation are also presented. Experimental results are shown to illustrate the feasibility of the proposed strategy.</P>
Kyo-Beum Lee,Blaabjerg, F. IEEE 2008 IEEE transactions on industrial electronics Vol.55 No.2
<P>This paper presents a new direct torque controlled space vector modulated method to improve the sensorless performance of matrix converter drives using a parameter estimation scheme. The flux and torque error are geometrically combined in a new flux leakage vector to make a stator command voltage vector in a deadbeat manner. A new sensorless method of estimating the rotor speed, flux, stator resistance, and rotor resistance is derived and verified with experimental results. Common terms in the error dynamics are utilized to find a simpler error model involving some auxiliary variables. Using this error model, the state estimation problem is converted into a parameter estimation problem assuming the rotor speed is constant. The proposed adaptive schemes are determined so that the whole system is stable in the sense of Lyapunov. The effectiveness of the proposed algorithm is verified by experiments.</P>
Simple Power Control for Sensorless Induction Motor Drives Fed by a Matrix Converter
Kyo-Beum Lee,Blaabjerg, F. IEEE 2008 IEEE transactions on energy conversion Vol.23 No.3
<P>This paper presents a new and simple method for sensorless control of matrix converter drives using a power flowing to the motor. The proposed control algorithm is based on controlling the instantaneous real and imaginary powers into the induction motor. To improve low-speed sensorless performance, the nonlinearities of a matrix converter drive such as commutation delays, turn-ON and turn-OFF times of switching devices, and on-state switching device voltage drop are modeled using a PQ power transformation and compensated using a reference power control scheme. The proposed sensorless control method is applied for the induction motor drive using a 3 kW matrix converter system. Experimental results are shown to illustrate the feasibility of the proposed strategy.</P>
Matrix Converter로 구동되는 유도전동기 구동장치를 위한 전력이론을 이용한 간단한 센서리스 기법
이교범(Kyo-Beum Lee),김원상(Won-Sang Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
본 논문은 전동기의 일정한 공극자속과 전동기에 유입되는 무효전력을 이용한 매트릭스 컨버터 구동장치의 새롭고 간단한 센서리스 기법을 제안한다. 저속의 센서리스 성능 향상을 위해 정류지연, 스위칭장치들의 턴-온, 턴-오프시간 그리고 스위칭장치의 온-상태에서 전압강하와 같은 매트릭스 컨버터의 비선형성을 PQR 전력변환을 이용하여 모델링하고 기준 전류제어기법을 이용하여 보상한다. 3 ㎾급의 매트릭스 컨버터 구동시스템에 적용하여 제안된 센서리스 기법의 타당성을 검증한다.
확장 루엔버거 관측기를 이용한 저속영역에서의 전동기 관성 추정
이교범(Kyo-Beum Lee),강호진(Ho-Jin Kang),송중호(Joong-Ho Song),최익(Ick Choy),유지윤(Ji-Yoon Yoo) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
A new scheme to estimate machine inertia in low speed is proposed in this paper. It is necessary to consider the machine parameter of low speed instantaneous observer to precise control in servo system, which has frequent load variation and speed change, To estimate machine parameter, especially the moment of inertia, Reduced-Order Extended Luenberger Observer (ROELO) is applied The effectiveness of the proposed ROELO is showed by simulation
Robust and Stable Disturbance Observer of Servo System for Low-Speed Operation
Lee, Kyo-Beum,Blaabjerg, Frede IEEE 2007 IEEE transactions on industry applications Vol.43 No.3
<P> A new scheme to estimate the moment of inertia in the servo motor drive system in very low speed is proposed in this paper. The speed estimation scheme in most servo drive systems for low-speed operation is sensitive to the variation of machine parameter, especially the moment of inertia. To estimate the motor inertia value, the observer using the Radial Basis Function Network (RBFN) is applied. A control law for stabilizing the system and adaptive laws for updating both of the weights in the RBFN and a bounding constant are established so that the whole closed-loop system is stable in the sense of <B><I>Lyapunov</I></B>. The effectiveness of the proposed inertia estimation is verified by simulations and experiments. </P>
Speed-Sensorless DTC-SVM for Matrix Converter Drives With Simple Nonlinearity Compensation
Lee, Kyo-Beum,Blaabjerg, Frede,Yoon, Tae-Woong [Institute of Electrical and Electronic Engineers] 2007 IEEE transactions on industry applications Vol.43 No.6
<P> This paper presents a new method to improve the sensorless performance of matrix converter drives using a parameter estimation scheme. To improve low-speed sensorless performance, the nonlinearities of a matrix converter drive such as commutation delays, turn-on and turn-off times of switching devices, and <SMALL>ON</SMALL>-state switching device voltage drop is modeled using <B><I>p</I></B>–<B><I>q</I></B>– <B><I>r</I></B> transformation and compensated using a reference current control scheme. To eliminate the input current distortion due to the input voltage unbalance, a simple method using <B><I>p</I></B>–<B><I>q</I></B>– <B><I>r</I></B> transformation is also presented. The proposed compensation method is applied for high performance induction motor drives using a 3-kW matrix converter system without a speed sensor. Experimental results are shown to illustrate the feasibility of the proposed strategy. </P>