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윤덕용,최규하,홍순찬,백수현,이은웅,Yoon, Duck-Yong,Choe, Gyu-Ha,Hong, Soon-Chan,Baek, Soo-Hyun,Lee, Eun-Woong 전력전자학회 1996 전력전자학회지 Vol.1 No.1
This paper proposes the control algorithm for maximum efficiency drive of PWM inverter - induction motor system with high dynamic performance. If the induction motor is driven under light load with rated magnetizing current, the Iron loss is excessively large compared with the codder loss which results in doer motor efficiency. Maximum efficiency drive of an induction motor can be achieved by controlling the magnetizing current to satisfy the optimal ratio that leads the total motor loss to be a minimum value at a given speed. The proposed control algorithm essentially uses vector control technique and adopts voltage decoupling control strategy to prevent the degradation of dynamic performance due to reduced magnetizing current. To verify the proposed method, digital simulations and experiments are carried out for a squirrel-cage induction motor with the rating of 2.2[kW].
윤덕용(Duck-Yong Yoon) 전력전자학회 2021 전력전자학술대회 논문집 Vol.2021 No.11
본 논문에서는 창문이 없는 밀폐형 돼지 축사의 환기 제어용으로 사용하는 고성능 환기팬을 개발하고 그것의 제어 성능을 시험하였다. 현재까지 사용해온 대부분의 환기팬은 돈사 내부의 온도를 기준으로 팬 날개를 구동하는 전동기의 회전속도를 제어하는 방식으로 되어 있는데, 이러한 방식은 밤과 낮으로 변하는 돈사 실내외의 온도차나 외부의 바람에 의하여 발생하는 환기팬 통풍구에서의 음압을 전혀 고려하지 않고 단순히 실내 온도에 따라 회전속도를 제어하므로 최적의 올바른 환기가 불가능하다. 본 논문에서 제안하는 고성능 스마트 환기팬은 실제 환기량을 측정하는 센서 날개를 추가하고 이를 사용한 피드백 제어를 수행함으로써 어떤 상황에서도 지정된 목표 환기량을 정확하게 제어하는 특성을 가지고 있다.
TRIAC을 이용한 커패시터 운전형 단상 유도전동기의 속도제어 특성
이승용(Seung-Yong Lee),윤덕용(Duck-Yong Yoon) 대한전기학회 2012 전기학회논문지 Vol.61 No.9
This paper presents speed control characteristics of capacitor-run SPIM(Single Phase Induction Motor) using TRIAC for comparing and analyzing four kinds of voltage control methods such as supply voltage control, main winding voltage control, auxiliary winding voltage control and auxiliary winding voltage control without starting capacitor. The computer simulations were performed using MATLAB Simulink to show control characteristics of four voltage control methods. And their control characteristics were conformed by experiments for capacitor-run 90W SPIM as a sample motor. The results of simulations and experiments show that supply voltage control method has fast dynamic response characteristics and main winding voltage control method has higher power efficiency and can be implemented at lower system cost.
영구자석형 동기전동기 구동용 인버터를 150도 통전 방식으로 운전하기 위한 PWM 기법에 관한 연구
이승용(Seung-Yong Lee),윤덕용(Duck-Yong Yoon) 대한전기학회 2019 전기학회논문지 Vol.68 No.2
In this paper, we have studied the PWM techniques for operating inverter for PMSM with 150-degree conduction method. In the conventional upper switch PWM technique, only three upper switches perform PWM switching, so they are very much used and have a large switching loss compared to three lower switches. And torque ripple occurs due to circulating current flowing by difference of back-EMF generated between two stator windings of motor in PWM switching section of inverter where one upper switch for PWM switching is turned off and two lower switches are turned on when motor operate in high speed and at light load. So, we propose a six-switch asymmetrical discontinuous PWM(SADPWM) techniques in order to improve the disadvantages of upper switch PWM technique. The proposed PWM technique can be used as SADPWM1 and SADPWM2 technique by changing the order of PWM switching sections. Computer simulations and experiments were carried out for SPMSM of 750[W] class. Using proposed PWM technique, upper and lower switches have the same PWM switching operation. And circulating current did not flow in stator winding of motor under operating condition in which motor operate at high speed 3000[rpm] and at light load. In addition, it is confirmed that loss of switching elements in inverter is reduced at light load and torque ripple of motor does not occur. Also, in SADPWM2 technique freewheeling current does not flow in the non-conduction section and less operation loss results in comparison to SADPWM1 technique. Because proposed PWM technique can be realized only by software modification in conventional upper switch PWM technique, it can be widely used in applications using 120-degree conduction method. Also, it can be applied to inverter for BLDCM.
채수용(Soo-Yong Chae),서영민(Young-Min Seo),정대택(Dae-Taek Chung),윤덕용(Duck-Yong Yoon),홍순찬(Soon-Chan Hong) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
This paper proposes a DC-DC converter which is able to charge and discharge secondary batteries. The converter operates as a double-ended forward converter in charging process and as electrical isolated boost converter in discharging process. The converter is designed for continuous current operation. The switching frequency is selected as 100㎑ to reduce the size of both the inductor and the capacitor.
영구자석형 동기전동기 구동용 인버터의 통전각에 따른 운전 방식의 비교 분석
이승용(Seung-Yong Lee),윤덕용(Duck-Yong Yoon) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.5
본 논문에서는 영구자석형 동기전동기를 구동하는 인버터에서 사용할 수 있는 정현파 전류 운전 방식과 120도 운전방식 및 150도 운전 방식에 대하여 각각 시뮬레이션을 수행하고 이것들의 운전 특성을 비교 분석한다. 이 운전 방식들은 통전각과 전동기의 상전류에 형태로 구분이 된다. 종래에는 인버터의 효율 향상을 위하여 정현파 전류 운전 방식과 120도 운전 방식 간의 전환 방법에 중점을 둔 연구가 많았으나, 본 논문에서는 이들 각각의 운전 방식에 대한 운전 특성을 비교분석하여 그것들의 장점을 다양한 전환 방법으로 응용할 수 있도록 하는데 중점을 둔다. 이를 위하여 각각의 운전 방식에 대하여 전동기의 발생 토크, 속도 응답 특성, 상전류 THD에 대하여 시뮬레이션을 수행하였다. 그 결과로 정현파 전류 운전방식이 3가지 운전 방식들 중에서 전체적으로 가장 좋은 성능을 보였고, 120도 운전 방식은 150도 운전 방식에 비하여 속도응답 특성이 다소 우수하였으며, 150도 운전 방식은 120도 운전 방식에 비하여 상전류 THD가 낮은 것을 확인하였다. In this study, the sinusoidal-wave driving method, six-step driving method, and twelve-step driving method, which can be used in an inverter for permanent-magnet synchronous motors, were simulated, and the results were compared to review their operating performance. These driving methods were classified according to the electrical conduction angle and phase current of the motor. Conventionally, only the transition control technique between the sinusoidal-wave driving method and six-step driving method was studied for the efficiency of the inverter. In this paper, however, comparative analysis was focused on a variety of transition control applications to use the advantages of each driving method. For this purpose, computer simulations for these driving methods were carried out to obtain the motor torque, speed control characteristics, and THD of the motor phase currents. As a result, the sinusoidal-wave driving method showed the best performance in all respects. The six-step driving method has better speed control characteristics than the twelve-step driving method, and the twelve-step driving method has a lower THD of the motor phase currents than the six-step driving method.