The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
권호 표지

Performance Improvement of a Grid-connected PWM Inverter using a Power Theory

전력 이론을 이용한 계통연계 PWM 인버터 시스템의 성능 개선

  • Published : 2008.08.20
Download PDF
⟨ Previous Next ⟩

Abstract

The demand of a three phase PWM inverter for the purpose of power control or grid-connecting is increasing. This inverter is connected to a grid through an L-filter or LCL-filter to reduce the harmonics caused by switching. An LCL-filter can reduce the harmonic of a low switching frequency and generate a satisfactory level of grid side current with a relatively low-inductance than an L-filter. But the additional poles caused by the LC part affects a stability problem due to induced resonance of the system. This paper presents a compensation method using a power theory to improve performance, the designed LCL-filter system and to reduce the stability problems caused by resonance. The effectiveness of the proposed algorithm is verified by simulations and experiments.

3상의 PWM 인버터는 풍력발전설비에서 계통연계나 전력제어의 목적으로 그 수요가 급증하고 있다. 이러한 인버터는 스위칭에 의한 고조파를 저감하기 위하여 L-필터나 LCL-필터를 통하여 계통과 연결된다. LCL-필터는 L-필터에 비하여 낮은 스위칭 주파수의 고조파도 효율적으로 저감할 수 있으며 비교적 적은 인덕턴스로 만족할 만한 수준의 계통 전류를 생성한다. 하지만 LC의 추가로 인해 생기는 추가 극점이 시스템의 공진을 초래하여 안정성 문제에 영향을 미친다. 본 논문에서는 전력이론을 이용하여 설계된 LCL필터 시스템의 성능향상과 공진에 의한 안정성 문제의 개선기법을 제안한다. 시뮬레이션과 실험결과를 바탕으로 개선기법의 타당성을 보인다.

Keywords

References

  1. M. P. Kazmierkowski, R. Krishnan, and F. Blaabjerg, Control in Power Electronics, New York Academic, 2002
  2. M. Liserre, F. Blaabjerg, and S. Hansen, "Design and control of an LCL-filter-based three-phase active rectifier", IEEE Transactions on Industry Applications, Vol. 41, No. 5, pp. 1284-1285, 2005, Sept./Oct
  3. 노재석, 최재호, "전압형 PWM 컨버터의 교류입력측 LCL필터 설계", 전력전자학회 논문지, 제7권 제5호, pp. 490-498, 2002. 10
  4. M. Liserre, A. Dell'Aquila, F. Blaabjerg, "Stability improvements of an LCL-filter based three-phase active rectifier", in Proceedings of PESC'02, pp. 1195-1201, 2002, June
  5. V. Blasko and V. Kaura, "A novel control to actively damp resonance in input lc filter of a three-phase voltage source converter", IEEE Transactions on Industry Applications, Vol. 33, No. 2, pp. 542-550, 1997, Mar./Apr https://doi.org/10.1109/28.568021
  6. P. K. Dahono, "A control method for DC-DC converter that has an LCL output filter based on new virtual capacitor and resister concept", in Proceedings of PESC'04, pp. 36-42, 2004, June
  7. M. Liserre, A. Dell'Aquila, and F. Blaabjerg, "Genetic algorithm based design of the active damping for a LCL-filter three-phase active rectifier", IEEE Transactions on Power Electronics, Vol. 19, No. 1, pp. 76-86, 2004, Jan https://doi.org/10.1109/TPEL.2003.820540
  8. 이교범, "PQR 순시전력이론을 이용한 Matrix Converter 구동장치의 비선형 특성 보상", 대한전기학회 논문지, 53B권 12호, pp. 751-758, 2004. 12
  9. K. B. Lee and F. Blaabjerg, "A Simple Sensorless Scheme for Induction Motor Drives Fed by a Matrix Converter Using Constant Air-Gap Flux and PQR Transformation", International Journal of Control, Automation, and Systems, Vol. 5, No. 6, pp. 652-662, 2007, Dec
  10. M. Malinowski, M. P. Kazmierkowski, S. Hansen, and F. Blaabjerg, "Virtual-flux-based direct power control of three-phase PWM rectifiers", IEEE Transactions on Industry Applications, Vol. 37, No. 4, pp. 1019-1027, 2001, July/Aug. https://doi.org/10.1109/28.936392