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Anno Yoo,Seung-Ki Sul,Dong-Cheol Lee,Cha-Seung Jun IEEE 2009 IEEE transactions on power electronics Vol.24 No.12
<P>Recently, high-performance AC motor drive technologies, including field-oriented control (FOC), have been widely used in home appliance products such as direct-drive drum washing machines. In low-cost AC machine drive systems, speed or position sensors with high resolution are not available due to high costs. Instead, a low-resolution sensor is installed to calculate the speed and rotor position. In the FOC, however, accurate rotor angle information is essential for high performance. In addition to the low resolution of the sensor, its accuracy is poor due to mechanical errors and signal processing. The inaccurate and delayed position information degrades the performance of current regulation and also increases torque ripples, which is the source of mechanical vibration and acoustic noise. In order to overcome this hardware problem, this study proposes a software technique based on a novel dual observer and a position sensor offset compensation strategy. The dual observer can estimate the rotor speed and position without time delay or bumps. Also, with the compensation algorithm for position sensor offset, the misaligned synchronous reference frame d- and q-axis can be corrected. Experimental results verify the effectiveness of the proposed method.</P>
Yoo, Anno,Han, Sang-Heon,Son, Young Ik,Yoon, Young-Doo,Hong, Chanook The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.4
This paper proposes a design guideline for the feedback gain of the adaptive full-order observer in the speed sensorless control of induction machines. The performance of the adaptive full-order observer is dependent on its feedback gain. This paper presents a pole placement method for the observer feedback gain design to improve the estimation performance of the speed adaptive observer. In the proposed method, the observer poles can be chosen independently of the induction motor poles. Instead, they can be positioned according to the operating speed. An analysis and experimental results obtained with the proposed method reveals better performances under general operating conditions.
Robust On-line Rotor Time Constant Estimation for Induction Machines
Anno Yoo 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.5
This paper proposes an on-line rotor time constant estimation strategy for indirect field oriented induction machines. The performance of the indirect field oriented control is dependent especially on the rotor time constant whose value varies according to the temperature. The proposed method calculates the difference between the nominal rotor time constant and the real value from the d- and q-axis integration terms of a proportional integral (PI) current regulator and the demanded voltages of the induction machine to regulate the current in the steady state. Because the proposed strategy has a simple structure and is available in wide speed and torque ranges, the proposed method can be easily used in the industrial field. The effectiveness of proposed strategy is verified with simulations and a 7.5kW experimental setup.
Anno Yoo,Sang-Heon Han,Young Ik Son,Young-Doo Yoon,Chanook Hong 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.4
This paper proposes a design guideline for the feedback gain of the adaptive full-order observer in the speed sensorless control of induction machines. The performance of the adaptive full-order observer is dependent on its feedback gain. This paper presents a pole placement method for the observer feedback gain design to improve the estimation performance of the speed adaptive observer. In the proposed method, the observer poles can be chosen independently of the induction motor poles. Instead, they can be positioned according to the operating speed. An analysis and experimental results obtained with the proposed method reveals better performances under general operating conditions.
Robust On-line Rotor Time Constant Estimation for Induction Machines
Yoo, Anno The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.5
This paper proposes an on-line rotor time constant estimation strategy for indirect field oriented induction machines. The performance of the indirect field oriented control is dependent especially on the rotor time constant whose value varies according to the temperature. The proposed method calculates the difference between the nominal rotor time constant and the real value from the d- and q-axis integration terms of a proportional integral (PI) current regulator and the demanded voltages of the induction machine to regulate the current in the steady state. Because the proposed strategy has a simple structure and is available in wide speed and torque ranges, the proposed method can be easily used in the industrial field. The effectiveness of proposed strategy is verified with simulations and a 7.5kW experimental setup.
Design of Flux Observer Robust to Interior Permanent-Magnet Synchronous Motor Flux Variation
Anno Yoo,Seung-Ki Sul IEEE 2009 IEEE transactions on industry applications Vol.45 No.5
<P>This paper presents a modified flux observer which is robust to the variation of the permanent-magnet flux linkage of an interior permanent-magnet synchronous motor (IPMSM). The IPMSM is driven by a current-regulated inverter, where the <I>d</I>-<I>q</I> axis currents are controlled by two proportional and integral controllers with feedforward cross-coupling decoupling terms. The integrator outputs of the current regulator reflecting flux errors are used to compensate the flux variation according to the operating temperature and manufacturing tolerance. The proposed flux observer shows satisfactory performance not only in maximum torque per ampere operating region but also in flux weakening region. The experimental results reveal the effectiveness of the proposed observer.</P>
Anno Yoo,Kyeongseo Kim,Seung-Ki Sul 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper proposes a novel circuit topology for AC/DC power converter based on a high frequency universal link. And the operation principles of the circuit are presented. The proposed power converter has small capacitances at DC-links. The reactive components are minimized, and the circuit has advantage of the reduced volume and increased efficiency. Even though the voltage of the 1<SUP>st</SUP> DC-link is rectified version of input AC voltage and it is variable, the magnitude of series-connected output voltage is constant on the average sense thanks to so called “sine modulation”. The demanded power is transferred by the phase-shift control between the series-connected sinemodulated voltage and the constant 2<SUP>nd</SUP> DC-link voltage. The presented analysis derives the power transfer equation with high-frequency components and some experimental results show the validity of the analysis and the performance of the circuit.
전압 사용율 증대를 통한 매입형 영구자석 동기 전동기의 고속 운전 성능 향상에 대한 연구
유안노(Anno Yoo),김혜승(Hyeseung Kim),홍찬욱(Chanook Hong),김경서(Kyung-Seo Kim) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
본 논문에서는 전압 사용율 증대를 통한 매입형 영구자석 동기 전동기의 약자속 운전 성능 향상 방법을 제시한다. 팬, 펌프 등과 같이 고속 운전이 빈번한 분야에 사용되는 매입형 영구자석 동기 전동기는 운전 속도에 따라, 적절한 약자속 운전 방법이 필요하다. 본 논문에서는 전류 지령 수정을 하는 매입형 영구자석 동기전동기의 약자속 운전 방법을 제시하고, 실험을 통하여 그 타당성을 입증하였다.
직렬 연결 고주파 변압기를 가지는 교류/직류 전력변환 회로
유안노(Anno Yoo),김명호(Myoungho Kim),설승기(Seung-Ki Sul) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
본 논문에서는 계통 연계가 가능한 새로운 교류/직류 전력변환 장치를 제안한다. 제안된 전력변환 회로는 정현파의 입력상 전류를 가지고, 양방향 전력 전달이 가능하며, 역률 제어가 가능하다는 장점으로 인하여 계통 연계형 전력변환 장치로 적합하다. 특히 제안된 전력변환 장치는 무효전력 소자의 사용을 최소화하여 시스템의 신뢰성을 증대시키고, 전기적 절연을 고주파 변압기를 통하여 얻도록 하여 시스템의 부피를 줄일 수 있다는 장점을 갖는다. 본 논문에서는 제안된 전력변환 회로의 구성 방법과 각 부분 별 동작에 대해서 기술하였으며 실험 장치를 구성하여 그 타당성을 입증하였다.