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논문 기본 정보

자료유형
학술저널
저자정보
(충남대) (충남대) (신동파워텍) (충남대)
저널정보
전력전자학회 전력전자학회논문지 전력전자학회 논문지 제21권 제2호
발행연도
수록면
168 - 174 (7page)

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초록· 키워드

In this paper, current control using PI controller in the synchronous reference frame is analyzed through the relationship among bandwidth, resonance frequency, and sampling frequency in the grid-connected inverter with LCL filter. Stability is investigated by using bode plot in frequency domain and root locus in discrete domain. The feedback variable is the grid current, which is regulated by the PI controller in the synchronous reference frame. System delay is modeled as 1.5Ts, which contains computational and PWM modulator delay. Two resonance frequencies are given at 815 Hz and 3.16 kHz from LCL filter parameters. Sufficient phase and gain margins can be obtained to guarantee stable current control, in case that resonance frequency is above one-sixth of the sampling frequency. Unstable current control is performed when resonance frequency is below one-sixth of the sampling frequency. Analysis results of stability from frequency response and discrete response is the same regardless of resonance frequency. Finally, stability of current control based on theoretical analysis is clearly verified through simulation and experiment in grid-connected inverters with LCL filter.
#LCL filter #Grid-connected inverter #Current control #Stability analysis
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목차

  1. Abstract
  2. 1. 서론
  3. 2. LCL 필터를 사용하는 계통연계형 인버터 전류제어
  4. 3. LCL 필터를 사용하는 전류제어 안정도 해석
  5. 4. 시뮬레이션 및 실험 결과
  6. 5. 결론
  7. References

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UCI(KEPA) : I410-ECN-0101-2016-560-002771555