DVR시스템에 사용되는 인버터부의LC필터 설계와 피드백 성능분석Design and Feedback Performance Analysis of the Inverter-side LC Filters Used in the DVR System
- Other Titles
- Design and Feedback Performance Analysis of the Inverter-side LC Filters Used in the DVR System
- Authors
- 손진근; 박종찬
- Issue Date
- 2015
- Publisher
- 대한전기학회
- Keywords
- Dynamic voltage restorers(DVRs); LC passive filter; PWM inverter; THD(total harmonic distortion) reduction; Voltage sag
- Citation
- 전기학회 논문지 P권, v.64, no.2, pp.79 - 84
- Journal Title
- 전기학회 논문지 P권
- Volume
- 64
- Number
- 2
- Start Page
- 79
- End Page
- 84
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/11554
- ISSN
- 1229-800x
- 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.
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