DVR시스템에 사용되는 인버터부의 LC필터 설계와 피드백 성능분석

다국어 초록 (Multilingual Abstract)

Voltage sags are considered the dominant disturbances affecting power quality. Dynamic voltage restorers(DVRs) are mainly used to protect sensitive loads from the electrical network voltage disturbances such as sags or swells and could be used to reduce harmonic distortion of ac voltages. The typical DVR topology essentially contains a PWM inverter with LC Filter, an injection transformer connected between the ac voltage line and the sensitive load, and a DC energy storage device. For injecting series voltage, the PWM inverter is used and the passive filter consist of inductor(L) and capacitor(C) for harmonics elimination of the inverter. However there are voltage pulsation responses by the characteristic of the LC passive filter that eliminate the harmonics of the PWM output waveform of the inverter. Therefore, this paper presented design and feedback performance of LC filter used in the DVRs. The voltage control by LC filter should be connected in the line side since this feedback method allows a relatively faster dynamic response, enabling the elimination of voltage notches or spikes in the beginning and in the end of sags and strong load voltage THD reduction. Illustrative examples are also included.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. DVR의 제어특성과 필터설계
• 3. DVR의 폐루프 제어기의 특성 비교
• 4. DVR의 (간이)동작과 필터의 FFT분석
• 5. 결론
• References

참고문헌 (Reference)

1 손진근, "친환경 Ultra-capacitor에 의한 순시전압강하의 직렬전압보상 시스템" 전기학회논문지ABCD 58 (4) : 763 ~ 769 , 2009

2 손진근, "수퍼커패시터를 이용한 상시가동형 순시전압강하 보상시스템의 개발" 전기학회 논문지 P권 58 (2) : 101 ~ 107 , 2009

3 M. H. Haque, "Voltage sag correction by dynamic voltage restorer with minimum power injection" IEEE Power Engineering Review 21 (5) : 56 ~ 58 , 2001

4 Amhof, D.,Daehler, P.,Gruening, H.,Kara, A., "Power supply quality improvement with a dynamic voltage restorer(DVR)" IEEE IEEE Applied Power Electronics Conference and Exposition : 986 ~ 993 , 1998

5 Fitzer, C., "Mitigation of saturation in dynamic voltage restorer connection transformers" Power Electronics, IEEE Trans 17 (6) : 1058 ~ 1066 , 2002

6 N. H. Woodley., "Field experience with the new platformmounted DVR/sup TM/" IEEE International Conference on PowerCon 2000 : 1323 ~ 1328 , 2000

7 R. S. Weissbach., "Dynamic voltage compensation on distribution feeders using flywheel energy storage" IEEE Trans. Power Delivery 14 : 465 ~ 471 , 1999