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고전압 펄스 발생 장치의 관한 부하의 변화를 고려한 펄스회로의 이론적 연구
김영주(Young-Ju Kim),방상석(Sang-Seok Bang),이채한(Chae-Han Lee),김상현(Sang-Hyun Kim) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.3
The high-voltage pulse generator consists of transformers of fundamental wave and harmonic waves, and shunt capacitors. The pulse has the fundamental wave and the harmonic waves that have been as a series circuit by the transformers to make high voltage pulse. This paper shows that pulse generator circuit is analyzed by using transformer equivalent circuits with the effect of load and simulated in time domain using Matlab program. The output voltage of pulse were obtained to 2.5kHz, 2.0kV. In high voltage circuit, capacitors are related to frequency band pass characteristics. Also, it is shown that the voltage of output pulse increases according to the growth of load.
H-Bridge 7레벨 인버터를 이용한 유도전동기 구동시스템의 노이즈 저감을 위한 출력 필터설계
김수홍,안영오,김윤호,방상석,김광섭,Kim, Soo-Hong,Ahn, Young-Oh,Kim, Yoon-Ho,Bang, Sang-Seok,Kim, Kwang-Seob 한국조명전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.3
일반적으로 PWM인버터에 발생된 고조파와 노이즈는 스위칭 주파수, dv/dt와 di/dt, PWM 스위칭 방법에 의해 영향을 받는다. 멀티레벨 인버터가 고전력 시스템에 적용되어 낮은 주파수에서 동작할 때 이것은 큰 고조파 성분과 노이즈를 발생하게 된다. 따라서 멀티레벨 인버터에 출력 필터가 요구된다. 본 논문에서는 H-bridge 7레벨 인버터 시스템을 사용한 3상 유도 전동기 구동 시스템의 고조파와 노이즈 감소를 위해 출력 필터를 설계하였다. 가격이 저렴하고 간단한 구조를 가지며, 고조파와 노이즈를 효과적으로 감소시킬 수 있는 수동필터는 멀티레벨 인버터 시스템을 사용한 3상 유도전동기 구동시스템에 적용되었다. 설계된 시스템은 향상되었고, 시뮬레이션과 실험을 통해 그 타당성을 증명하였다. In general, the generated harmonics and noise of the PWM inverter are affected by PWM switching method, switching frequency, dv/dt and di/dt. Since multilevel inverters are often applied to the high power system, and operates with low switching frequency, theyproduce large size of harmonic contents and noise. Thus it is necessary to install output filters in the multilevel inverter. In this paper a filter design approach for the harmonic and noise reduction the three phase induction motor driving system using H-bridge 7-level inverter system is presented. The passive filter that has low cost and simple structure and can effectively reduce harmonics and noise, is designed and applied to the three phase induction motor drive having multilevel inverter system. The designed system is implemented and verified by simulation and experiments.
3-레벨 인버터 공간벡터 변조시의 중성점 전위 변동 보상법
서재형(Jae Hyeong Seo),김광섭(Kwang Seob Kim),방상석(Sang Seok Bang),최창호(Chang Ho Choi) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
In performing the three-level SVPWM, it is nearly impossible to control the neutral-point potential exactly to the half of the dc-link voltage at all times. Therefore the inverter would produce an erroneous output voltage by this voltage unbalance. So the voltage unbalance has to be compensated in doing PWM, when the voltage unbalance occurs whether it is small or large, to make the inverter output voltage follow the reference voltage exactly the same. In this paper, a new compensating method for the neutral-point potential variation in a three-level inverter space vector PWM CSVPWM) is presented. By using the proposed method, the output voltage of the inverter can be made same as the reference voltage and thus the current and torque ripple of the inverter driven motor can be greatly improved even if the voltage unbalance is quite large. The proposed method is verified experimentally with a 3-level IGBT inverter.
멀티레벨 인버터를 이용한 3상 유도전동기 구동 시스템의 EMI 필터 설계
金倫鎬(Yoon-Ho Kim),金洙弘(Soo-Hong Kim),安永五(Young-Oh Ahn),方相石(Sang-Seok Bang),金光燮(Kwang-Seob Kim) 대한전기학회 2006 전기학회논문지 B Vol.55 No.5
In this paper EMI problems with induction motor drive system using multi-level inverters are investigated. The high power multi-level inverter usually operates with low switching frequency and produces large noises. Generally, EMI consists of the conduction component through source lines and emission component emitted to the space. This conduction component can be classified to the common-mode between source line and ground, and the normal-mode between lines. The EMI filters for the induction motor drive system are designed and implemented to reduce EMI noise. Finally the designed system is verified by the experiment. The experimental results show that both the normal mode and common mode noises are greatly reduced compared to the system without filters.