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황선환(Seon-Hwan Hwang),김장목(Jang-Mok Kim),임익헌(Ik-Hun Lim),류호선(Ho-Seon Ryu),이주현(Joo-Hyun Lee),김봉석(Bong-Suck Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
In voltage-fed inverter(VSI), the reference voltage and the output voltage is nonlinear because of the dead-time effect and the voltage drop of the switching devices. The voltage distortion invokes serious problems such as current waveform distortion and deterioration of the performance. In this paper, a new dead-time compensation algorithm is proposed, and based on the average-value theory. Experimental results are presented to verify the validity of the proposed method.
오버랩 제어기법 및 2차 저역통과 RC필터를 이용한 영구자석 BLDC 전동기의 온라인 권선 단락 진단기법
황선환(Seon-Hwan Hwang),유진형(Jin-Hyung Yoo),정태욱(Tae-Uk Jung) 한국조명·전기설비학회 2019 조명·전기설비학회논문지 Vol.33 No.1
Recently, BLDC motors are used in widened area because of permanent magnet manufacturing technology and drive technology are developed. The use of permanent magnets has been actively pursued for application to fields requiring high efficiency motors due to their high output relative to weight as well as high efficiency advantages over induction motors and wire wound type synchronous motors. However, BLDC motors are not reliable in the realtime diagnosis results, so they are mainly used for diagnosis by direct measurement after decomposition. This method has the disadvantage that the accuracy is guaranteed but the diagnosis time is very long. In order to overcome these drawbacks, this paper proposes a method to diagnose turn fault by using overlap control method and 2nd order RC filter for online diagnosis of permanent magnet BLDC motor. The validity of the proposed diagnosis method is verified by analyzing the results of 2D finite element analysis.
단상 계통연계형 인버터의 SRF-PLL 옵셋 오차로 인한 전류 맥동 저감에 관한 연구
황선환(Seon-Hwan Hwang),황영기(Young-Gi Hwang),권순걸(Soon-Kurl Kwon) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.11
This paper presents an offset error compensation algorithm for the accurate phase angle of the grid voltage in single-phase grid-connected inverters. The offset error generated from the grid voltage measurement process cause the fundamental harmonic component with grid frequency in the synchronous reference frame phase lock loop (PLL). As a result, the grid angle is distorted and the power quality in power systems is degraded. In addition, the dq-axis currents in the synchronous reference frame and phase current have the dc component, first and second order ripples compared with the grid frequency under the distorted grid angle. In this paper, the effects of the offset and scaling errors are analyzed based on the synchronous reference frame PLL. Particularly, the offset error can be estimated from the integrator output of the synchronous reference frame PLL and compensated by using proportional-integral controller. Moreover, the RMS (Root Mean Square) function is proposed to detect the offset error component. The effectiveness of the proposed algorithm is verified through simulation and experiment results.
3상 영구자석 동기전동기의 속도 맥동 저감을 위한 비례공진 전향보상 제어 알고리즘
이선영(Seon-Yeong Lee),황선환(Seon-Hwan Hwang),김경엽(Gyung-Yub Kim),박종원(Jong-Won Park) 한국전기전자학회 2020 전기전자학회논문지 Vol.24 No.4
본 논문에서는 3상 영구자석 동기전동기의 속도리플 저감을 위한 가변형 비례공진 전향보상 알고리즘을 제안한다. 일반적인 토크 맥동의 원인은 전류측정오차 및 데드타임으로 인한 전기적 맥동과 회전자 편심과 편심 부하로 인해 발생될 수 있다. 이러한 토크 맥동은 전동기의 속도 맥동을 야기하고 전동기 구동 시스템의 운전 성능을 저하시킬 수 있다. 이를 위한 본 논문에서는 속도 맥동의 원인을 분석하고 속도 맥동을 저감하기 위한 알고리즘을 제안하였다. 제안한 알고리즘은 속도 맥동에 포함된 특정 운전 주파수를 저감하기 위해 가변형 비례 공진 제어기를 적용하였고, 전향보상 제어기 구조를 이용하여 보상 동작이 수행되도록 하였다. 제안한 알고리즘은 다양한 실험을 통하여 타당성과 효용성을 검증하였다. This paper propose a variable proportional resonant feedforward algorithm for reducing the speed ripple of a three-phase permanent magnet synchronous motor. In general, the torque ripples can be generated by electrical pulsation due to current measurement errors and dead time and mechanical pulsation because of rotor eccentricity and eccentric load. These torque pulsations can cause speed pulsations of the motor and degrade the operating performance of the motor drive system. Therefore, in this paper, the factors of the speed ripple is analyzed and an algorithm to reduce the speed ripple is proposed. The proposed algorithm applied a variable proportional resonant controller in order to reduce the specific operating frequency included in the speed pulsation, and utilized a feedforward compensation controller structure to perform the compensation operation. The proposed algorithm is verified through various experiments.
풀 브릿지 인버터의 비선형성을 고려한 단상 영구자석 동기 전동기의 구형파 전압 주입 기동 기법
유상민,황선환,이기창,Yoo, Sang-Min,Hwang, Seon-Hwan,Lee, Ki-Chang 항공우주시스템공학회 2022 항공우주시스템공학회지 Vol.16 No.3
The purpose of this paper was to propose a method for improving the performance of the open-loop control of single-phase permanent magnet synchronous motor (SP-PMSM), based on a square wave voltage injection. Generally, the SP-PMSM driving systems cmprise a full-bridge inverter and asymmetric air-gap structure of magnetic circuit, because a zero torque occurs on the symmetrical air-gap. As a result, it cannot be started at a specific rotor position. Thus, it is possible to cause the start-up failure at an open-loop control for sensorless operation of SP-PMSM. In this paper, the method with square wave voltage injection considering the nonlinearity of the inverter is presented to resolve the problem. The effectiveness of the proposed algorithm is verified through several experiments.
단상 영구자석 동기 전동기의 비대칭 공극 구조를 고려한 회전자 초기 자극 검출 기법
서승우,황선환,박종원,김용휴,Seo, Sung-Woo,Hwang, Seon-Hwan,Park, Jong-Won,Kim, Yong-Hyu 전력전자학회 2022 전력전자학회지 Vol.27 No.1
This paper proposes an initial rotor polarity detection algorithm of a single-phase permanent magnet synchronous motor (SP-PMSM) related to stable open-loop starting for sensorless operation. Generally, the SP-PMSM needs an asymmetric air-gap structure to can avoid the initial starting failure at zero torque point. Therefore, the rotor polarity information can be obtained by using the DC offset current direction of a stator current through a high frequency voltage injection into an SP-PMSM with an asymmetric air gap. In this paper, the proposed rotor initial polarity detection algorithm is verified through several experimental results.
풀 브리지 인버터 기반 단상 유도전동기의 소프트 기동 기법
김태성,강형도,황선환,Kim, Tae-Seong,Kang, Hyung-Do,Hwang, Seon-Hwan 한국전기전자학회 2018 전기전자학회논문지 Vol.22 No.2
This paper proposes an algorithm for reducing the starting current when the single-phase induction motor starts and analyzes its operation. Generally, the single-phase induction motors require several starters to generate the starting torque due to their structural characteristics. In this paper, a capacitor-start / capacitor-run method of the single-phase induction motor is basically adopted. This conventional method is efficient and has a large starting torque, but it generates about 5 ~ 6 times of inrush current at startup. As a result, the freezer starting device and peripheral devices are damaged and life time may be reduced. To reduce the inrush current, the current control algorithm based on the virtual dq model is presented to control the starting current. In addition, it validates the proposed algorithm through experiments to smooth transit from start-up operation to the rated operating region. 본 논문은 단상 유도전동기의 기동 시 발생하는 기동전류를 분석하고 이를 저감하기 위한 알고리즘을 제안한다. 일반적으로 단상 유도전동기는 구조적인 특성으로 인해 기동토크를 발생시킬 수 있는 별도의 기동장치가 요구된다. 본 논문에서 사용되고 있는 방법은 커패시터-기동/커패시터-운전 방식이며 타 방식 대비 기동토크가 크고 운전효율이 높은 특성이 있다. 하지만 초기 기동 시 약 5~6배에 해당되는 돌입전류가 발생하며 이로 인한 초저온 냉동고 기동 소자와 주변기기들의 소손 및 수명 저하의 원인이 된다. 기동 시 발생하는 돌입전류를 저감하기 위하여 가상 dq모델 기반의 전류제어 알고리즘을 적용하여 기동 전류를 제한하고, 정격운전에 도달 시 상용전원과 동일한 운전조건으로 전환하기 위한 알고리즘을 실험을 통하여 그 타당성을 검증한다.
시각장애인의 12주간 필라테스 참여에 따른 신체조성, 체력 및 심리적 건강의 변화
이선주 ( Lee Seon-ju ),황선환 ( Hwang Sun-hwan ) 한국융합과학회 2018 한국융합과학회지 Vol.7 No.3
연구목적: 시각장애인을 대상으로 필라테스 운동 참여와 신체적 ·심리적 건강과의 관계를 규명하여 신체활동이 부족한 시각장애인의 운동효과를 증진시키고 나아가 삶의 질 향상을 연구 목적으로 하였다. 연구방법: 시각장애인 15명을 대상으로 12주간 필라테스 운동프로그램을 선정하여 체육관에서 주당 2회씩 1회당 90분씩의 프로그램에 참여를 통해 신체조성, 체력 및 심리적 건강의 변화를 알아보았다. 결과: 15명의 참가자 중 13명의 데이터가 분석에 활용되었으며, 12주간의 필라테스 운동 참여를 통해 전반적으로 신체적 ·심리적 건강이 향상된 것으로 나타났다. 특히, 기초대사량과 근지구력이 유의하게 증가한 것으로 나타났으며, 운동몰입이 높은 참가자는 운동만족이 높은 것으로 나타났다. 이러한 결과는 시각장애인의 필라테스 운동이 신체적· 심리적 건강 향상에 기여할 수 있는 운동효과를 제공할 수 있으며, 운동참여 시 운동몰입을 강화시켜 높은 만족을 경험할 수 있도록 적절한 환경과 다양한 프로그램을 제공해야 함을 시사하고 있다. 결론: 신체활동이 부족한 시각장애인의 운동효과를 증진시키고 나아가 삶의 질을 향상시킬 수 있는 심층적인 연구가 지속되어야 할 것이다. Purpose: The purpose of this study was to investigate the relationship between the participation of the Pilates body composition, fitness, and psychological health of the visually handicapped people and to improve the exercise effect of the visually impaired people with physical activity and to improve the quality of life. Methods: We examined the change of body composition, fitness and psychological health by participating in the program for 90 minutes per two times per week in the gymnasium. The subjects were participants in Pilates program for 12 weeks and a total of participants were 15 blind people. Results: Data from 13 of the 15 participants were used for analyses, and fitness and psychological health were improved overall by participating in the Pilates exercise for 12 weeks. Especially, the basal metabolic rate and muscle endurance were significantly increased, and participants with high exercise intention showed high exercise satisfaction. These results suggest that the Pilates movement of fitness and visually impaired can provide the exercise effect that contributes to the improvement of fitness and psychological health. The program should provide them with the appropriate environment and various program. By doing these, they can experience the high satisfaction by strengthening the exercise commitment when participating in the exercise. Conclusion: Systematic and in-depth studies should be continued to develop a quality program that can improve the athletic effects of blind people with physical activity and improve their quality of life.