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논문 기본 정보

자료유형
학술대회자료
저자정보
Changzhou Yu (Hefei University) Haizhen Xu (Hefei University) Chun Liu (Hefei University) Qinglong Wang (Hefei University) Xing Zhang (Hefei University of Technology) Fang Liu (Hefei University of Technology) Fei Li (Hefei University of Technology)
저널정보
전력전자학회 ICPE(ISPE)논문집 ICPE 2019-ECCE Asia
발행연도
2019.5
수록면
2,610 - 2,615 (6page)

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Mega-scale solar projects are turning to string inverters nowadays. Multi-parallel string inverters are employed as the interface to the utility grid, giving rise to potential unstable problems. Aiming at this issue, the relationship between number of inverters, output power and grid impedance is analyzed. Based on this, according to different topology, control structures and filter parameters, four types of Standard Equivalent Model (SEM) for multiinverters system are established. By analyzing the stability margin of the four SEMs and the sensitivity of their control parameters, the difference of stability between the string inverters and the central inverters is compared. Finally, the established SEM and the comparison results of the string and central inverters are verified by simulation and experimental results.

목차

Abstract
I. INTRODUCTION
II. RELATIONSHIPS BETWEEN THE GRID CHARACTERISTIC AND PARALLELED INVERTERS
III. STANDARD EQUIVALENT MODEL OF FOUR TYPE INVERTERS
IV. STABILITY ANALYSIS AND COMPARISON OF STRING INVERTER AND CENTRAL INVERTER
V. INFLUENCE OF CONTROL GAIN AND CONTROL DELAY ON PHASE MARGIN
VI. EXPERIMENTAL RESULTS
VII. CONCLUSIONS
REFERENCES

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