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Byung-Geuk Cho,Chanook Hong,Sang-Joon Lee 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Proportional and resonant(PR) current controllers have been used in stationary reference frame for three phase systems as well as single phase ac systems. Theoretically, the PR controllers are to achieve zero steady state error with respect to ac signals and originally the structure of the PR controllers are derived by transforming PI controllers which are proper for DC signal control. Normally, the performance of the PR controllers is satisfactory with comparatively high cutoff frequency for low frequency signal control. However, as the cutoff frequency and the controlled ac frequency become closer, the performance is deteriorated and transient response is heavily dependent on the system parameters. This phenomenon is conspicuous in high frequency signal control such as grid harmonics compensation or dead time compensation. Therefore, in this paper, a modified PR controller which shows improved transient performance for high frequency signals control is proposed. The effectiveness of the proposed controller is proved with simulation.
A Mixed Model based Sensorless Control Method for Permanent Magnet Synchronous Machine
Hak-Jun Lee,Chanook Hong,Sang-Joon Lee 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In general, sensorless control methods for Permanent Magnet Synchronous Machine (PMSM) are classified into saliency tracking based method and fundamental model based method. In the fundamental model based method, the rotor position and speed can be estimated based on the mathematical model of PMSM. The typical fundamental models for sensorless control are classified into current model and voltage model. In this paper, a mixed model is proposed as a fundamental model for sensorless control. The mixed model has characteristics of both models. The current model is dominant in low speed range, and the voltage model is dominant in high speed range. Thus, the mixed model based sensorless control method is robust in wide speed range. For the sensorless control, the mixed-model based back electromotive force (EMF) state observer and speed estimator are proposed in this paper. The validity of the proposed sensorless control method is verified by the experimental results with 3.7 kW PMSM drive system.
Non-cascaded position controllers for servo motor drives
Cho, Byung-Geuk,Hong, Chanook,Lee, Jeongjoon The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.4
Generally, position controllers for servo motor drives utilize cascaded structures with speed and current controllers in inner loops. This structure provides easy gain setups and independent limits for control variables such as maximum torque or speed. However, it suffers from a large computation time and poor dynamic characteristics for the position control since the bandwidth must be low enough to guarantee those of the speed and current controllers. To cope with this, two non-cascaded position controllers where speed controller is removed are proposed. The first one is equivalent to the conventional controller in terms of the dynamic characteristics. However, the number of gains for the position control is reduced. The second one is aimed at improving the dynamic characteristics with more complicated structures. The proposed methods are effectively validated through MATLAB/Simulink simulations and 3.7 kW IPM motor drive experiments.
Simple position sensorless V/f scalar control method for permanent-magnet synchronous motor drives
Cho, Byung-Geuk,Hong, Chanook,Lee, Jeongjoon,Lee, Wook-Jin The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.7
When permanent magnet synchronous motors (PMSM) are used in pump and fan applications where no excessive performance is required, the V/f scalar control method can be applied to enhance the ease of use for end users. For the voltage reference generation in V/f control, existing methods requires motor parameters such as the stator resistance, inductance, and back EMF constant of the permanent magnet, which is identified before or during operation. However, this paper proposes a simple and convenient V/f control method that utilizes the motor parameters given on the name plate. In the proposed method, stable operations are ensured for the rated speed and load ranges without position sensors. For successful starting operation, a DC current control loop is included to calculate the initial offset voltage reference for the V/f pattern. The stability and effectiveness of the proposed method are analyzed and verified by MATLAB/Simulink and 3.7 kW IPM motor drive experiments.
Restarting strategy for an induction machine driven with medium-voltage inverter
Seung-cheol Choi,Jeongjoon Lee,Chanook Hong,Anno Yoo 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Electric machine drive systems have a protection mechanism for momentary power interruption. Generally, when the momentary power interruption is occurred, outputs of a drive system are stopped for the protection. For stable continuous operation, it is sometimes required the restarting strategy which is called as a flying start when the input power is recovered and the rotor is still rotating freely due to the large inertia of high power electric machine. The paper suggests the flying start strategy at momentary power loss. The proposed strategy is composed of the phase-locked loop(PLL) and Double Second-Order Generalized Integrator(DSOGI), based on the measured input voltages at electric machine side and the voltage compensation. The magnitude, frequency and phase angle of the residual voltages are estimated with PLL and DSOGI and the induced initial voltage is compensated considering the operating conditions. With the proposed strategy, the target drive system can be restored to the operation point of a prior failure. The proposed method is validated by the experiment with a miniature of MV drives.
Development of Water-Cooled Heat Sink for High-Power IGBT Inverter
Minsub Han,Su-Dong Lee,Chanook Hong,Chun-Suk Yang,Kyung-Seo Kim 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
We present the development of a water-cooled heat sink that provides reliable thermal performance for high-power IGBT inverter. The development process comprises three stages. In the concept design, the thermal performances of two design proposals are considered. The thermal system of each design is particularly analyzed using the compact model. In the detailed design stage, specific dimensions of the heat sink are determined considering the design options under given external restrictions and the results from three-dimensional heat transfer analysis. The prototype of the resultant design is made and tested on the rig for final confirmation. We emphasize the relevant use of the thermal analysis on each stage and also discuss various practical issues involved.
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.
김일한(Ilhan Kim),이선우(Seonwoo Lee),홍찬욱(Chanook Hong),양천석(Chunsuk Yang),김경서(Kyungseo Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
인버터(inverter)는 고전압 배터리(battery)로부터 에너지를 공급받아 전동기를 제어하는 장치로써, 전기자동차 구동력 제어를 위한 전기 동력전달장치(electric powertrain)의 핵심장치이다. 이러한 전기 자동차용 인버터는 가혹환경 조건에서 고신뢰성을 보장하여야 하며, 차량의 최적 구동을 위하여 전동기를 고속 및 고효율로 제어할 필요가 있다. 본 논문에서는 전기 자동차용 인버터의 출력밀도(power density) 향상, 고신뢰성 확보 및 전동기 최적 제어를 위한 최적 수냉기구 개발 결과와 자동차용 사양(automotive spec.)의 고신뢰성 하드웨어 개발 결과 그리고 전동기의 고효율/고속 제어 기술 개발 결과를 소개한다. 또한 본 논문의 인버터 개발 결과를 적용한 유럽 전기 자동차 전문 메이커의 성공적인 NEV(Neighborhood Electric Vehicle) 개발 사례에 대하여도 다룬다.
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.